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Sample records for propenyl aniline cpipa

  1. Process for making propenyl ethers and photopolymerizable compositions containing them

    Science.gov (United States)

    Crivello, James V.

    1996-01-01

    Propenyl ether monomers of formula V A(OCH.dbd.CHCH.sub.3).sub.n wherein n is an integer from one to six and A is selected from cyclic ethers, polyether and alkanes are disclosed. The monomers are readily polymerized in the presence of cationic photoinitiators, when exposed to actinic radiation, to form poly(propenyl ethers) that are useful for coatings, sealants, varnishes and adhesives. Compositions for preparing polymeric coatings comprising the compounds of formula V together with particular cationic photoinitiators are also disclosed, as are processes for making the monomers from allyl halides and readily available alcohols. The process involves rearranging the resulting allyl ethers to propenyl ethers.

  2. Aniline oligomers versus polyaniline

    Czech Academy of Sciences Publication Activity Database

    Stejskal, Jaroslav; Trchová, Miroslava

    2012-01-01

    Roč. 61, č. 2 (2012), s. 240-251 ISSN 0959-8103 R&D Projects: GA AV ČR IAA400500905; GA AV ČR IAA100500902; GA ČR GA203/08/0686; GA ČR GA202/09/1626 Institutional research plan: CEZ:AV0Z40500505 Keywords : polyaniline * anilin e oligomers * anilin e Subject RIV: CD - Macromolecular Chemistry Impact factor: 2.125, year: 2012

  3. Electrorheology of aniline oligomers

    Czech Academy of Sciences Publication Activity Database

    Mrlík, M.; Sedlačík, M.; Pavlínek, V.; Bober, Patrycja; Trchová, Miroslava; Stejskal, Jaroslav; Sáha, P.

    2013-01-01

    Roč. 291, č. 9 (2013), s. 2079-2086 ISSN 0303-402X R&D Projects: GA ČR GA202/09/1626 Institutional support: RVO:61389013 Keywords : anilin e oligomers * polyaniline * electrorheology Subject RIV: JI - Composite Materials Impact factor: 2.410, year: 2013

  4. Pulse Radiolysis of Aqueous Solutions of Aniline and Substituted Anilines

    Energy Technology Data Exchange (ETDEWEB)

    Christensen, H C

    1971-07-01

    The primary reactions of hydrated electrons, hydrogen atoms and hydroxyl radicals with aniline and the aniline cation in aqueous solutions have been studied by the technique of pulse radiolysis and by determination of end products after y-radiolysis. Hydrogen atoms and hydrated electrons react with aniline under formation of the cyclohexadienyl type radical with absorption maximum at 355 nm and an extinction coefficient of 4100/M/cm. A similar radical formed by reaction of hydrogen atoms with the aniline cation has its absorption maximum at 31 0 nm and an extinction coefficient of 3200/M/cm. Hydrogen atoms react with the acid and neutral forms of aniline with rate constants of (1.3 +- 0.2 ) x 109/M/s and (2.9 +- 0.7) x 109/M/s, respectively. OH radicals react with aniline with a rate constant of (1.4 +- 0.3) x 1010/M/s under formation of the cyclohexadienyl radical with absorption maximum at 355 nm and the anilino radical with absorption maxima at 300 and 400 nm. The cyclohexadienyl radical decayed in a first order process with a rate constant of 1.4 x 105/s by elimination of NH{sub 3}, whereas the anilino radical disappeared in a second order reaction under formation of hydrazobenzene. O- radicals react with aniline at pH 13.3 with a rate constant of (3.1 +- 0.6) x 109 under formation of anilino radicals. The reaction of OH radicals with the aniline cation produced the anilino radical cation with a rate constant of (4.8 +- 0.8) x 109 . The absorption maximum was placed at 415 nm, The cyclohexadienyl type radical with absorption maximum at 350 nm was also found in aqueous solutions of 2-amino-1,3-dimethylbenzene but was not formed in solutions of N,N' -dimethylaniline

  5. Pulse Radiolysis of Aqueous Solutions of Aniline and Substituted Anilines

    International Nuclear Information System (INIS)

    Christensen, H.C.

    1971-01-01

    The primary reactions of hydrated electrons, hydrogen atoms and hydroxyl radicals with aniline and the aniline cation in aqueous solutions have been studied by the technique of pulse radiolysis and by determination of end products after y-radiolysis. Hydrogen atoms and hydrated electrons react with aniline under formation of the cyclohexadienyl type radical with absorption maximum at 355 nm and an extinction coefficient of 4100/M/cm. A similar radical formed by reaction of hydrogen atoms with the aniline cation has its absorption maximum at 31 0 nm and an extinction coefficient of 3200/M/cm. Hydrogen atoms react with the acid and neutral forms of aniline with rate constants of (1.3 ± 0.2 ) x 10 9 /M/s and (2.9 ± 0.7) x 10 9 /M/s, respectively. OH radicals react with aniline with a rate constant of (1.4 ± 0.3) x 10 10 /M/s under formation of the cyclohexadienyl radical with absorption maximum at 355 nm and the anilino radical with absorption maxima at 300 and 400 nm. The cyclohexadienyl radical decayed in a first order process with a rate constant of 1.4 x 10 5 /s by elimination of NH 3 , whereas the anilino radical disappeared in a second order reaction under formation of hydrazobenzene. O - radicals react with aniline at pH 13.3 with a rate constant of (3.1 ± 0.6) x 10 9 under formation of anilino radicals. The reaction of OH radicals with the aniline cation produced the anilino radical cation with a rate constant of (4.8 ± 0.8) x 10 9 . The absorption maximum was placed at 415 nm, The cyclohexadienyl type radical with absorption maximum at 350 nm was also found in aqueous solutions of 2-amino-1,3-dimethylbenzene but was not formed in solutions of N,N' -dimethylaniline

  6. 159 - 162_Kogo_Aniline

    African Journals Online (AJOL)

    pc

    mechanical properties of doped polyester fabric with aniline w s of various ... tion of the PANI solution rly constant up to ... computer interface and printer according to the AS. Figure 2: .... Material Systems and Structures, 23(17), pp. 1969-1986.

  7. Synthesis by plasma of halogenated poly anilines

    International Nuclear Information System (INIS)

    Enriquez, M.A.; Olayo, M.G.; Cruz, G.J.

    2002-01-01

    In this work polymerization by plasma of aniline with iodine and chlorine bonded chemically to the aniline ring were realized. The results of the synthesis and characterizations are compared with those ones obtained starting from the poly aniline synthesis (P An) doped with iodine, where the dopant was aggregated in the moment of the polymerization. The objective is to study the dopant behavior in the synthesis by plasma in function of the properties of these polymers. (Author)

  8. Chemical and Biological Properties of S-1-Propenyl-l-Cysteine in Aged Garlic Extract.

    Science.gov (United States)

    Kodera, Yukihioro; Ushijima, Mitsuyasu; Amano, Hirotaka; Suzuki, Jun-Ichiro; Matsutomo, Toshiaki

    2017-03-31

    S-1-Propenyl-l-cysteine (S1PC) is a stereoisomer of S-1-Propenyl-l-cysteine (SAC), an important sulfur-containing amino acid that plays a role for the beneficial pharmacological effects of aged garlic extract (AGE). The existence of S1PC in garlic preparations has been known since the 1960's. However, there was no report regarding the biological and/or pharmacological activity of S1PC until 2016. Recently, we performed a series of studies to examine the chemical, biological, pharmacological and pharmacokinetic properties of S1PC, and obtained some interesting results. S1PC existed only in trace amounts in raw garlic, but its concentration increased almost up to the level similar of SAC through aging process of AGE. S1PC showed immunomodulatory effects in vitro and in vivo, and reduced blood pressure in a hypertensive animal model. A pharmacokinetic study revealed that S1PC was readily absorbed after oral administration in rats and dogs with bioavailability of 88-100%. Additionally, S1PC had little inhibitory influence on human cytochrome P450 activities, even at a concentration of 1 mM. Based on these findings, S1PC was suggested to be another important, pharmacologically active and safe component of AGE similar to SAC. In this review, we highlight some results from recent studies on S1PC and discuss the potential medicinal value of S1PC.

  9. Chemical and Biological Properties of S-1-Propenyl-ʟ-Cysteine in Aged Garlic Extract

    Directory of Open Access Journals (Sweden)

    Yukihioro Kodera

    2017-03-01

    Full Text Available S-1-Propenyl-ʟ-cysteine (S1PC is a stereoisomer of S-1-Propenyl-ʟ-cysteine (SAC, an important sulfur-containing amino acid that plays a role for the beneficial pharmacological effects of aged garlic extract (AGE. The existence of S1PC in garlic preparations has been known since the 1960’s. However, there was no report regarding the biological and/or pharmacological activity of S1PC until 2016. Recently, we performed a series of studies to examine the chemical, biological, pharmacological and pharmacokinetic properties of S1PC, and obtained some interesting results. S1PC existed only in trace amounts in raw garlic, but its concentration increased almost up to the level similar of SAC through aging process of AGE. S1PC showed immunomodulatory effects in vitro and in vivo, and reduced blood pressure in a hypertensive animal model. A pharmacokinetic study revealed that S1PC was readily absorbed after oral administration in rats and dogs with bioavailability of 88–100%. Additionally, S1PC had little inhibitory influence on human cytochrome P450 activities, even at a concentration of 1 mM. Based on these findings, S1PC was suggested to be another important, pharmacologically active and safe component of AGE similar to SAC. In this review, we highlight some results from recent studies on S1PC and discuss the potential medicinal value of S1PC.

  10. Synthesis and characterization of poly aniline/wood and poly aniline/carbon composites

    International Nuclear Information System (INIS)

    Kanwal, F.; Siddiqi, S.A.; Tasleem, S.

    2009-01-01

    Conducting polymers have shown many applications in the field of nano science, nano technology and nuclear science. Poly aniline (PAN I) is the most studied conducting polymer due to its environmental stability, easy availability of its raw materials, and simple synthesis. We have synthesized poly aniline and two of its conducting composites i.e., poly aniline-carbon and poly aniline-wood in acidic medium (HCI) using K/sub 2/Cr/sub 2/O/sub 7/ as oxidizing agent. All samples were characterized by FTIR and four-probe d.c. conductivity methods The synthesis was carried out at two different temperatures (0 degree C and -5 degree C) and it was found that the yield and conductivity were maximum at lower temperature (-5 degree C). The poly aniline-carbon composites showed enhanced conductivity whereas poly aniline-wood composites showed reduced conductivity when compared with the conductivity of pure poly aniline. (author)

  11. Nitrotyrosine formation in splenic toxicity of aniline

    International Nuclear Information System (INIS)

    Khan, M. Firoze; Wu Xiaohong; Kaphalia, Bhupendra S.; Boor, Paul J.; Ansari, G.A.S.

    2003-01-01

    Splenic toxicity of aniline is characterized by vascular congestion, hyperplasia, fibrosis and development of a variety of sarcomas in rats. However, the mechanisms of this selective splenic toxicity are not well understood. Previously we showed that aniline exposure causes oxidative damage to spleen. To further explore the oxidative mechanisms of aniline toxicity, we evaluated the contributions of nitric oxide. Nitric oxide reacts with superoxide anion to form peroxynitrite, a powerful oxidant that converts the tyrosine residues of proteins to nitrotyrosine (NT). Therefore, aim of this study was to establish the role of nitric oxide through the formation and localization of NT in the spleen of rats exposed to aniline. Male Sprague-Dawley (SD) rats were given 1 mmol/kg per day aniline hydrochloride in water by gavage for 7 days, while the controls received water only. Immunohistochemical analysis for NT showed an intense staining in the red pulp areas of spleen from aniline-treated rats, localized in macrophages and sinusoidal cells. Occasionally mild NT immunostaining was also evident in the white pulp. Western blot analyses of the post-nuclear fraction of the spleens showed major nitrated proteins with molecular weights of 49, 30 and 18 kDa. Immunohistochemical analysis of inducible nitric oxide synthase (iNOS) also showed increased expression in the red pulp of the spleens from aniline-treated rats; the cellular localization was similar to nitrated proteins. These studies suggest that oxidative stress in aniline toxicity also includes aberration in nitric oxide production leading to nitration of proteins. Functional consequences of such nitration will further elucidate the contribution of nitric oxide to the splenic toxicity of aniline

  12. High-resolution Imaging of pH in Alkaline Sediments and Water Based on a New Rapid Response Fluorescent Planar Optode

    Science.gov (United States)

    Han, Chao; Yao, Lei; Xu, Di; Xie, Xianchuan; Zhang, Chaosheng

    2016-05-01

    A new dual-lumophore optical sensor combined with a robust RGB referencing method was developed for two-dimensional (2D) pH imaging in alkaline sediments and water. The pH sensor film consisted of a proton-permeable polymer (PVC) in which two dyes with different pH sensitivities and emission colors: (1) chloro phenyl imino propenyl aniline (CPIPA) and (2) the coumarin dye Macrolex® fluorescence yellow 10 GN (MFY-10 GN) were entrapped. Calibration experiments revealed the typical sigmoid function and temperature dependencies. This sensor featured high sensitivity and fast response over the alkaline working ranges from pH 7.5 to pH 10.5. Cross-sensitivity towards ionic strength (IS) was found to be negligible for freshwater when IS applications.

  13. (E-3-Methyl-6-(3-oxo-3-(thiophen-2-yl-1-propenyl-2(3H-benzothiazolone

    Directory of Open Access Journals (Sweden)

    Yordanka Ivanova

    2016-04-01

    Full Text Available The title compound, (E-3-methyl-6-(3-oxo-3-(thiophen-2-yl-1-propenyl-2(3H-benzothiazolone, was synthesized by Claisen-Schmidt condensation of 3-methyl-2(3H-benzothiazolone-6-carbaldehyde with 2-acetylthiophene in 94% yield. The structure of the target compound was confirmed using 1H-NMR, 13C-NMR, IR, MS, and elemental analysis.

  14. Dielectric Relaxation Studies of 2-Butoxyethanol with Aniline and Substituted Anilines Using Time Domain Reflectometry

    Directory of Open Access Journals (Sweden)

    P. Jeevanandham

    2014-01-01

    Full Text Available The complex dielectric spectra of 2-butoxyethanol with aniline and substituted anilines like aniline, o-chloroaniline, m-chloroaniline, o-anisidine and m-anisidine binary mixtures in the composition of different volumes of percent (0%, 25%, 50%, 75%, and 100% have been measured as a function of frequency between 10 MHz and 30 GHz at 298.15 K. The dielectric parameters like static dielectric constant ε0 and relaxation time τ have been obtained by using least square fit method. By using these parameters ε0,τ, effective Kirkwood correlation factor geff, corrective Kirkwood correlation factor gf, Bruggeman factor fB, excess dielectric constant εE, and excess inverse relaxation time 1/τE values are calculated and discussed to yield information on the dipolar alignment and molecular rotation of the binary liquid mixtures. From all the derived dielectric parameters, molecular interactions are interpreted through hydrogen bonding.

  15. Patterning of electrically conductive poly(aniline-co-aniline sulfonic acid) and its application in the immobilization of cytochrome c

    International Nuclear Information System (INIS)

    Oh, Se Young; Oh, Il Soo; Choi, Jeong-Woo

    2004-01-01

    We have synthesized poly(aniline-co-aniline sulfonic acid) and then investigated the feasibility of application as a specific and electrically conductive binding template for biomolecules. Poly(aniline-co-aniline sulfonic acid)s were prepared by oxidation polymerization of aniline and aniline sulfonic acid under various ratios. A fine pattern of the conducting copolyaniline was obtained by using a deep UV lithographic technique. Cytochrome c was immobilized onto the photochemically patterned conducting copolyaniline with a self-assembly method. Physical and electrochemical properties of the self-assembled cytochrome c monolayer were studied from atomic force microscopy and cyclic voltammetry. The self-assembled cytochrome c monolayer immobilized onto the copolyaniline with a high electrical conductivity showed a high electrochemical activity

  16. Synthesis of new radiotracers based on aniline

    International Nuclear Information System (INIS)

    Ayari, Issra

    2008-01-01

    There are several possible applications of radioactivity, we cite: the study of the functional and neurochirnical aspects related to the brain. This study requires the synthesis of specific radiotracers able to cross their target tissue. The synthesis methods need to be constantly updated to respond to the big demand of this domain. The development of the chemistry of metal complexes helped us to find a stable radiotracer based on aniline and marked with technetium. This stability aI 10wed us to realize a possible biodistribution and to envisage to count the radioactivity and to valid the radiopharmaceutical. (Author)

  17. Chemical polymerization of aniline in phenylphosphinic acid

    Directory of Open Access Journals (Sweden)

    NICOLETA PLESU

    2005-10-01

    Full Text Available The chemical polymerization of aniline was performed in phenylphosphinic acid (APP medium using ammonium peroxidisulfate as the oxidizing agent, at 0 ºC and 25 ºC. The yield of polyaniline (PANI was about 60–69 %. The polymerization process required an induction time 8–10 times greater than in other acids (hydrochloric, sulfuric. The average density of the obtained polymer was 1.395 g cm-3 for PANI-salt and 1.203 g cm-3 for PANI-base. The acid capacity of PANI depends on the synthesis parameters and the maximum value was 15.02 meq/g polymer. The inherent viscosity of PANI was 0.662 dl/g at aniline/oxidant molar ratios >2 and 0 ºC. The oxidation state was a function of the synthesis parameters and lay between 0.553–0.625, as determined from UV-VIS and titration with TiCl3 data. The PANI samples were characterized by measurements of their density, inherent viscosity, conductivity, acid capacity, FTIR and UV-VIS spectrum, and thermogravimetric data.

  18. Aniline Is Rapidly Converted Into Paracetamol Impairing Male Reproductive Development.

    Science.gov (United States)

    Holm, Jacob Bak; Chalmey, Clementine; Modick, Hendrik; Jensen, Lars Skovgaard; Dierkes, Georg; Weiss, Tobias; Jensen, Benjamin Anderschou Holbech; Nørregård, Mette Marie; Borkowski, Kamil; Styrishave, Bjarne; Martin Koch, Holger; Mazaud-Guittot, Severine; Jegou, Bernard; Kristiansen, Karsten; Kristensen, David Møbjerg

    2015-11-01

    Industrial use of aniline is increasing worldwide with production estimated to surpass 5.6 million metric tons in 2016. Exposure to aniline occurs via air, diet, and water augmenting the risk of exposing a large number of individuals. Early observations suggest that aniline is metabolized to paracetamol/acetaminophen, likely explaining the omnipresence of low concentrations of paracetamol in European populations. This is of concern as recent studies implicate paracetamol as a disrupter of reproduction. Here, we show through steroidogenic profiling that exposure to aniline led to increased levels of the Δ4 steroids, suggesting that the activity of CYP21 was decreased. By contrast, paracetamol decreased levels of androgens likely through inhibition of CYP17A1 activity. We confirm that aniline in vivo is rapidly converted to paracetamol by the liver. Intrauterine exposure to aniline and paracetamol in environmental and pharmaceutical relevant doses resulted in shortening of the anogenital distance in mice, a sensitive marker of fetal androgen levels that in humans is associated with reproductive malformations and later life reproductive disorders. In conclusion, our results provide evidence for a scenario where aniline, through its conversion into antiandrogenic paracetamol, impairs male reproductive development. © The Author 2015. Published by Oxford University Press on behalf of the Society of Toxicology. All rights reserved. For Permissions, please e-mail: journals.permissions@oup.com.

  19. Aniline Induces Oxidative Stress and Apoptosis of Primary Cultured Hepatocytes

    Directory of Open Access Journals (Sweden)

    Yue Wang

    2016-11-01

    Full Text Available The toxicity and carcinogenicity of aniline in humans and animals have been well documented. However, the molecular mechanism involved in aniline-induced liver toxicity and carcinogenesis remains unclear. In our research, primary cultured hepatocytes were exposed to aniline (0, 1.25, 2.50, 5.0 and 10.0 μg/mL for 24 h in the presence or absence of N-acetyl-l-cysteine (NAC. Levels of reactive oxygen species (ROS, malondialdehyde (MDA, and glutathione (GSH, activities of superoxide dismutase (SOD and catalase (CAT, mitochondrial membrane potential, DNA damage, cell viability, and apoptosis were detected. Levels of ROS and MDA were significantly increased and levels of GSH and CAT, activity of SOD, and mitochondrial membrane potential in hepatocytes were significantly decreased by aniline compared with the negative control group. The tail moment and DNA content of the tail in exposed groups were significantly higher than those in the negative control group. Cell viability was reduced and apoptotic death was induced by aniline in a concentration-dependent manner. The phenomena of ROS generation, oxidative damage, loss of mitochondrial membrane potential, DNA damage and apoptosis could be prevented if ROS inhibitor NAC was added. ROS generation is involved in the loss of mitochondrial membrane potential and DNA injury, which may play a role in aniline-induced apoptosis in hepatocytes. Our study provides insight into the mechanism of aniline-induced toxicity and apoptosis of hepatocytes.

  20. Synthesis and Characterizations of Colloidal Nanostructured Copolymers of Aniline and Aniline Derivatives

    OpenAIRE

    GUAN, XIN NING

    2012-01-01

    Nanostructured conducting polymers such as polyaniline are promising candidates for next-generation electronics because of their low cost, mechanical flexibility, good solution processability, along with the low-dimensionality that is characteristic of nanoscale materials. Here, we further expand the attractive properties of polyaniline by copolymerizing it with a variety of substituted aniline monomers, with electron donating groups, electron withdrawing groups, or substituents that can enha...

  1. Synthesis of 2-hydroxy-3-(2-methyl-propenyl-1,4-naphthoquinone and related oxime derivatives

    Directory of Open Access Journals (Sweden)

    Patricia S. Oliveira

    2012-06-01

    Full Text Available The condensation reaction of commercial 2-hydroxy-1 ,4-naphthoquinone 1 (lawsone with isobutyraldehyde 2 furnishs norlapachol 3 (2-hydroxy-3-(2-methyl-propenyl -1,4-naphthoquinone with yields ranging from 66 to 93% depending on the different conditions tested, and a reaction temperature factor determinant for the formation of the desired product. It was treated with hydroxylamine hydrochloride in alkaline (NaOH to provide the oxime 4 from regioselective modification of the carbonyl C-1 with 91% yield. The regioselectivity of the reaction can be explained by analyzing the different resonance structures which can be seen that the carbonyl C-4 is less electrophilic than C-1. In this work was also obtained the oxime 5, 6 and 7 from lapachol, αlpha and β-lapachone, respectively, in yields of 64-85%. The oximes of αlpha and β-norlapachone, 8 and 9 are in obtention. All the products were analyzed by IR and NMR, and were observed that oximes of lapachol and norlapachol are isolated as E/Z mixtures. Two-dimensional NOE-type experiments of the corresponding acylated derivative will be made to help identify the proportion of the mixture.

  2. Structural characterization of Poly aniline blended with polyacrylamide

    International Nuclear Information System (INIS)

    Fayek, S.A.; El-Sayed, S.M.; Sayed, W.M.

    2007-01-01

    Poly aniline / polyacrylamide blends in presence of different catalysts were prepared. X-ray diffraction studies reveal that the samples produced are crystalline. Optical gap of the blend in the presence of NaCIO 4 used as a catalyst is greater than that in the presence of (NH 4 ) 2 S 2 O 8 as a catalyst. The structure of polyacrylamide (PAM) blended with poly aniline (PANI) were investigated by infrared spectroscopy, Grain size was identified using scanning electron microscopy [SEM

  3. Radioisotope tracer study in an aniline production reactor

    International Nuclear Information System (INIS)

    Pant, H.J.; Yelgoankar, V.N.; Mendhekar, G.N.

    1995-01-01

    A radioisotope tracer study was carried out in an aniline production reactor to investigate the cause of poor heat transfer from tube side to shell side in an aniline production (ANPO) reactor. The results of the study indicated that more than 50% of the shell volume was reduced due to deposition of the process material (i.e. fouling) on the shell walls and may be the cause of poor heat transfer in the reactor. (author). 2 refs., 2 figs

  4. Characterization of poly-aniline/silicon heterojunction for gamma dosimetry

    International Nuclear Information System (INIS)

    Laranjeira, Jane M.G.; Khoury, Helen J.; Azevedo, Walter M.; Silva Junior, Eronides F. da; Vasconcelos, Elder A.

    2000-01-01

    In this work, we have developed and characterized poly-aniline/silicon heterojunction diodes for dosimetry applications. The poly-aniline thin film (thickness in order of microns) was deposited on n-type Si (1 Ωcm) by spin-coating technique from soluble poly-aniline. Al electrode was evaporated on the back side of Si wafer and a circular gold electrode with an area of 0,0036 cm 2 was evaporated on the poly-aniline film. The UV-visible and infrared characterization of the poly-aniline solution and the poly-aniline film has also been done. The heterojunction presents good rectifying behavior at room temperature and the rectification ratio were found to be 51664 ±1,0 V under ambient conditions. The saturation current densities are of the order of 1,4 μA/cm 2 at -1,0 V. The forward current correspond to the negative polarity on the aluminum electrode side and the ideality factor of diodes was approximately 2. The rectifying characteristics of diodes was changed after interaction with gamma radiation ( 60 Co) and the results shows that this devices has potential for applications in dosimetry for doses in range of 0 to 4000 Gy. (author)

  5. Photoinduced electron transfer interaction of anthraquinones with aniline quenchers: Influence of methyl substitution in aniline donors

    Science.gov (United States)

    Sivakumar, V.; Ponnamma, Deepalekshmi; Hussein, Yasser H. A.

    2017-02-01

    Photoinduced electron transfer between triplet state of 9,10-anthraquinone (AQ) and its two derivatives: 2-chloro-9,10-anthraquinone (CAQ) and sodium anthraquinone-2-sulfonate (AQS) and ground state aniline (AN) and its dimethyl substitutions: 2,3-dimethylaniline (2,3-DMA), 2,6-dimethylaniline (2,6-DMA), 3,5-dimethylaniline (3,5-DMA) and N,N-dimethylaniline (N,N-DMA) is studied using nanosecond laser flash photolysis at room temperature. Detection of radical bands of quinone anions and aniline cations along with their formation and/or decay kinetics are used to confirm the electron transfer (ET) process. In MeCN medium, AN quenches the triplet state of CAQ (CAQT) but not the triplets AQT or AQST. However in aqueous medium, AN quenches AQST and forms radical ion pair. All the DMAs can react through ET with all the triplet quinones at different degrees of efficiency in MeCN medium. Noticeably, the ring substituted DMAs are less efficient in electron donation to AQT or AQST while the N,N-DMA shows high efficiency in donating electron to all triplet quinones in MeCN medium. Charge distribution of donor molecules, in MeCN medium is calculated using density functional theory (DFT), and shows an enhancement of electron density of the ring of N,N-DMA, making it an ideal electron donor for ET studies compared to other DMAs. This systematic selection and usage of anilines with electrochemically tunable quinones can be viewed as a working model of donor-acceptor system that can be utilized in photoinduced ET applications.

  6. Graphene-poly aniline by oxidative electro polymerization

    International Nuclear Information System (INIS)

    Pa-a, Jonathan E.; Enriquez, Erwin P.

    2013-01-01

    In this work , the photochemically synthesized NH 2 - graphene is doped with poly aniline through oxidative electro polymerization to form the NH 2 -graphene/poly aniline composites. These composites with varying amounts of NH 2 -graphene are investigated using Fourier Transform-infrared (FTIR) spectroscopy, ultraviolet-visible (UV)absorption spectroscopy , scanning electron microscopy (SEM-EDX), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), and electrochemical measurements. FTIR analysis strongly suggests incorporation of NH 2 -graphene sheets on poly aniline via imine (C=N) formation. UV/visible analysis of composites containing varying amounts of NH 2 -graphene in PANI shows different extent of modification on the oxidation state of the emeraldine base form to leuco emeraldine form of the PANI chain segments with possible formation of imine (C=N) units at other positions of the aniline ring in the composite, Time evolution UV/visible spectra by UV-irradiation of composites tend to proceed further with imine and phenazine-like microstructure formation. TEM and SEM images show patterns on aggregation of regular to deformed fibers surrounding planar surfaces which may indicate interior surface of NH 2 -graphene sheets not being grafted with polymers. Improved thermal stability of poly aniline in the presence of minimum amount of NH 2 -graphene sheets further confirms structural transformation within the microstructures. Electrochemical measurements by cyclic voltammetry show enhanced capacitive behavior relative to pure poly aniline. The route of synthesis using NH 2 -graphene and poly aniline offers a simple but controlled synthetic route for electrochemical doping and welding of N-containing heterocyclic structures onto pristine graphene sheets for possible use in sensing and energy storage applications. (author)

  7. Identification of Anaerobic Aniline-Degrading Bacteria at a Contaminated Industrial Site.

    Science.gov (United States)

    Sun, Weimin; Li, Yun; McGuinness, Lora R; Luo, Shuai; Huang, Weilin; Kerkhof, Lee J; Mack, E Erin; Häggblom, Max M; Fennell, Donna E

    2015-09-15

    Anaerobic aniline biodegradation was investigated under different electron-accepting conditions using contaminated canal and groundwater aquifer sediments from an industrial site. Aniline loss was observed in nitrate- and sulfate-amended microcosms and in microcosms established to promote methanogenic conditions. Lag times of 37 days (sulfate amended) to more than 100 days (methanogenic) were observed prior to activity. Time-series DNA-stable isotope probing (SIP) was used to identify bacteria that incorporated (13)C-labeled aniline in the microcosms established to promote methanogenic conditions. In microcosms from heavily contaminated aquifer sediments, a phylotype with 92.7% sequence similarity to Ignavibacterium album was identified as a dominant aniline degrader as indicated by incorporation of (13)C-aniline into its DNA. In microcosms from contaminated canal sediments, a bacterial phylotype within the family Anaerolineaceae, but without a match to any known genus, demonstrated the assimilation of (13)C-aniline. Acidovorax spp. were also identified as putative aniline degraders in both of these two treatments, indicating that these species were present and active in both the canal and aquifer sediments. There were multiple bacterial phylotypes associated with anaerobic degradation of aniline at this complex industrial site, which suggests that anaerobic transformation of aniline is an important process at the site. Furthermore, the aniline degrading phylotypes identified in the current study are not related to any known aniline-degrading bacteria. The identification of novel putative aniline degraders expands current knowledge regarding the potential fate of aniline under anaerobic conditions.

  8. Phytoremediation of polyaromatic hydrocarbons, anilines and phenols.

    Science.gov (United States)

    Harvey, Patricia J; Campanella, Bruno F; Castro, Paula M L; Harms, Hans; Lichtfouse, Eric; Schäffner, Anton R; Smrcek, Stanislav; Werck-Reichhart, Daniele

    2002-01-01

    Phytoremediation technologies based on the combined action of plants and the microbial communities that they support within the rhizosphere hold promise in the remediation of land and waterways contaminated with hydrocarbons but they have not yet been adopted in large-scale remediation strategies. In this review plant and microbial degradative capacities, viewed as a continuum, have been dissected in order to identify where bottle-necks and limitations exist. Phenols, anilines and polyaromatic hydrocarbons (PAHs) were selected as the target classes of molecule for consideration, in part because of their common patterns of distribution, but also because of the urgent need to develop techniques to overcome their toxicity to human health. Depending on the chemical and physical properties of the pollutant, the emerging picture suggests that plants will draw pollutants including PAHs into the plant rhizosphere to varying extents via the transpiration stream. Mycorrhizosphere-bacteria and -fungi may play a crucial role in establishing plants in degraded ecosystems. Within the rhizosphere, microbial degradative activities prevail in order to extract energy and carbon skeletons from the pollutants for microbial cell growth. There has been little systematic analysis of the changing dynamics of pollutant degradation within the rhizosphere; however, the importance of plants in supplying oxygen and nutrients to the rhizosphere via fine roots, and of the beneficial effect of microorganisms on plant root growth is stressed. In addition to their role in supporting rhizospheric degradative activities, plants may possess a limited capacity to transport some of the more mobile pollutants into roots and shoots via fine roots. In those situations where uptake does occur (i.e. only limited microbial activity in the rhizosphere) there is good evidence that the pollutant may be metabolised. However, plant uptake is frequently associated with the inhibition of plant growth and an

  9. Scientific criteria document for the development of an interim provincial water quality objective for aniline

    Energy Technology Data Exchange (ETDEWEB)

    Angelow, R.V.; Bazinet, N.

    1996-11-01

    The purpose of this document is to develop an interim provincial water quality objective for aniline for the protection of aquatic life in Ontario. It reviews the sources of aniline in the environment, its environmental fate and properties, acute and chronic toxicity as determined from results reported in the literature on toxicity tests using vertebrates and invertebrates, the bioaccumulation of aniline in the environment, mutagenic effects, and threshold aniline concentrations affecting fish odour and taste. The document then explains the derivation of the interim water quality objective. Water quality criteria for aniline developed in other jurisdictions are noted.

  10. [2- (2, 4-dimethylphenylthio) phenyl] aniline and it

    Indian Academy of Sciences (India)

    Sambhaji

    MgSO4, 0.5 g aspargine and 2 ml glycerol in distilled water (100 ml) followed by pH ..... aniline and its derivatives with the crystal structure of. Page 13. 13. Mycobacterium tuberculosis enoyl-acyl carrier protein reductase (InhA) (PDB ID: 4TZK).

  11. Selective Oxidative Carbonylation of Aniline to Diphenylurea with Ionic Liquids

    DEFF Research Database (Denmark)

    Zahrtmann, Nanette; Claver, Carmen; Godard, Cyril

    2018-01-01

    A catalytic system for the selective oxidative carbonylation of aniline to diphenylurea based on Pd complexes in combination with imidazolium ionic liquids is presented. Both oxidants, Pd complexes and ionic liquids affect the activity of the reaction while the choice of oxidant determines...

  12. Synthesis and characterization of poly iodine anilines by plasma

    International Nuclear Information System (INIS)

    Enriquez P, M.A.

    2003-01-01

    The polymers and organic materials present a numberless quantity of applications. However, it has not been but until recent times that it has been found that some of these materials can possess semiconductor properties. This has generated a great interest for the investigation in the area of semiconductor polymers. The poly aniline (Pan) it is one of the main semiconductor polymers because their electric properties change depending on the doping and of the state of oxidation to the one the molecules are subjected. The synthesis of this material has been carried out by means of chemical oxidation or electrochemistry. In this work a study is presented on the formation of poly aniline polymers with halogens chemically united to the aniline ring, poly(m-iodine aniline) (m-PAnI) and poly(m-chloroaniline) (m-PAnCI) for plasma. The plasma is generated by means of discharges of splendor with an r f amplifier to 13.5 MHz to drops pressures (10 -2 mbar). The synthesized polymers were obtained in form of thin film in the walls of the reactor and in the substrate introduced in the one. The electric properties of the polymers were evaluated in function of the time of reaction. Also, the conductivity of the polymers was compared synthesized in this work with reported data of synthesized poly aniline and doped with iodine for plasma. The highest values in conductivity are obtained in the poly aniline where the halogens are chemically connected to the ring that if it is doped with iodine. The atomic proportion in the surface of the polymers was analyzed by dispersive energy spectroscopy with which is deduced that the halogens come off of the molecules of the monomers or of the polymer in formation and that the atoms of iodine get lost more easily than those of chlorine. Other techniques that were used to characterize to the poly aniline were scanning electron microscopy, infrared spectroscopy, thermal gravimetric analysis and X-ray diffraction. The results are presented in

  13. Aniline-induced nitrosative stress in rat spleen: Proteomic identification of nitrated proteins

    International Nuclear Information System (INIS)

    Fan Xiuzhen; Wang Jianling; Soman, Kizhake V.; Ansari, G.A.S.; Khan, M. Firoze

    2011-01-01

    Aniline exposure is associated with toxicity to the spleen which is characterized by splenomegaly, hyperplasia, fibrosis, and a variety of sarcomas on chronic exposure in rats. However, mechanisms by which aniline elicits splenotoxic responses are not well understood. Earlier we have shown that aniline exposure leads to increased nitration of proteins in the spleen. However, nitrated proteins remain to be characterized. Therefore, in the current study using proteomic approaches, we focused on characterizing the nitrated proteins in the spleen of aniline-exposed rats. Aniline exposure led to increased tyrosine nitration of proteins, as determined by 2D Western blotting with anti-3-nitrotyrosine specific antibody, compared to the controls. The analyzed nitrated proteins were found in the molecular weight range of 27.7 to 123.6 kDa. A total of 37 nitrated proteins were identified in aniline-treated and control spleens. Among them, 25 were found only in aniline-treated rats, 11 were present in both aniline-treated and control rats, while one was found in controls only. The nitrated proteins identified mainly represent skeletal proteins, chaperones, ferric iron transporter, enzymes, nucleic acids binding protein, and signaling and protein synthesis pathways. Furthermore, aniline exposure led to significantly increased iNOS mRNA and protein expression in the spleen, suggesting its role in increased reactive nitrogen species formation and contribution to increased nitrated proteins. The identified nitrated proteins provide a global map to further investigate alterations in their structural and functional properties, which will lead to a better understanding of the role of protein nitration in aniline-mediated splenic toxicity. - Highlights: → Proteomic approaches are used to identify nitrated proteins in the spleen. → Twenty five nitrated proteins were found only in the spleen of aniline-treated rats. → Aniline exposure led to increased iNOS mRNA and protein

  14. Silicene catalyzed reduction of nitrobenzene to aniline: A mechanistic study

    Science.gov (United States)

    Morrissey, Christopher; He, Haiying

    2018-03-01

    The reduction of nitrobenzene to aniline has broad applications in chemical and pharmaceutical industries. The high reaction temperatures and pressures and unavoidable hazardous chemicals of current metal catalysts call for more environmentally friendly non-metal catalysts. In this study, the plausibility of silicene as a potential catalyst for nitrobenzene reduction is investigated with a focus on the distinct reaction mechanism based on the density functional theory. The direct reaction pathway was shown to be distinctly different from the Haber mechanism following PhNO2∗ → PhNO∗ → PhNHO∗ → PhNH2O∗ → PhNH2∗. The hydroxyl groups remain bound to silicene after aniline is formed and acquire a high activation barrier to remove.

  15. Modification of aniline containing proteins using an oxidative coupling strategy.

    Science.gov (United States)

    Hooker, Jacob M; Esser-Kahn, Aaron P; Francis, Matthew B

    2006-12-13

    A new bioconjugation reaction has been developed based on the chemoselective modification of anilines through an oxidative coupling pathway. Aryl amines were installed on the surface of protein substrates through lysine acylation reactions or through the use of native chemical ligation techniques. Upon exposure to NaIO4 in aqueous buffer, the anilines coupled rapidly to the aromatic rings of N,N-dialkyl-N'-acyl-p-phenylenediamines. The identities of the reaction products were confirmed using ESI-MS and through comparison to small molecule analogs. Control experiments indicated that none of the native amino acids participated in the reaction. The resulting bioconjugates were found to be stable toward hydrolysis from pH 4 to pH 11 and in the presence of many commonly used oxidants, reductants, and nucleophiles. A fluorescent phenylenediamine reagent was synthesized for the selective detection of aniline labeled proteins in mixtures, and the reaction was used to append the C-terminus of the green fluorescent protein with a single PEG chain. When combined with techniques for the incorporation of unnatural amino acids into proteins, this bioorthogonal coupling method should prove useful for a number of applications requiring a high degree of labeling specificity.

  16. Synthesis of Various Polyaniline / Clay Nanocomposites Derived from Aniline and Substituted Aniline Derivatives by Mechanochemical Intercalation Method

    Directory of Open Access Journals (Sweden)

    N. Kalaivasan

    2010-01-01

    Full Text Available Polyaniline clay nanocomposite can be prepared by mechano-chemical method in which intercalation of anilinium ion into the clay lattices accomplished by mechanical grinding of sodium montmorillonite (Na+MMT in presence of anilinium hydrochloride at room temperature using mortar & pestle for about 30 min and subsequent grinding with oxidizing agent, ammonium peroxysulfate. The appearance of green colour indicates the formation of polyaniline/clay nanocomposite (PANI/Clay. Similarly aniline derivatives like o-toludine and o-anisidine in the form of HCl salt can form intercalation into the clay lattices. The intercalated aniline derivatives were ground mechanically in presence of oxidizing agent ammonium peroxysulfate lead to formation of substituted polyaniline/ clay nanocomposites. The characteristics of various polyaniline-clay nanocomposites were investigated using UV-Visible, FT-IR, cyclic voltammetry studies.

  17. Molecular Interaction Study of some ortho and para Substituted Anilines with 1-Octanol

    OpenAIRE

    Manjunatha, M. S.; Sannappa, J.

    2010-01-01

    Interactions between ortho and para substituents of anilines such as chloroaniline, methylaniline and methoxyaniline with 1-octanol have been studied in carbon tetrachloride. The most likely association of complex between 1-octanol and substituents of anilines is 1:1 stoichiometric complex, through hydroxyl group of 1-octanol and amine group of ortho and para substituents of anilines. Interactions are studied on the bases of formation constant and free energy changes. Formation constant of...

  18. Synthesis by plasma of halogenated poly anilines; Sintesis por plasma de polianilinas halogenadas

    Energy Technology Data Exchange (ETDEWEB)

    Enriquez, M.A.; Olayo, M.G.; Cruz, G.J. [Facultad de Quimica, UAEM, 50000 Toluca, Estado de Mexico (Mexico)

    2002-07-01

    In this work polymerization by plasma of aniline with iodine and chlorine bonded chemically to the aniline ring were realized. The results of the synthesis and characterizations are compared with those ones obtained starting from the poly aniline synthesis (P An) doped with iodine, where the dopant was aggregated in the moment of the polymerization. The objective is to study the dopant behavior in the synthesis by plasma in function of the properties of these polymers. (Author)

  19. Removal of amino groups from anilines through diazonium salt-based reactions.

    Science.gov (United States)

    He, Linman; Qiu, Guanyinsheng; Gao, Yueqiu; Wu, Jie

    2014-09-28

    This minireview describes the applications of in situ generated diazonium salts from anilines in organic synthesis. In situ generation of diazonium salts from anilines represents an efficient and practical pathway, leading to a series of useful structures. In these transformations, the amino group of aniline formally acts as a leaving group. Two distinctive kinds of mechanisms, including transition metal (especially palladium)-catalyzed oxidative addition-reductive elimination and a radical process, are involved in the removal of amino groups from anilines, and both catalytic processes are described in this minireview.

  20. Synthesis of tritium and carbon-14 labelled N-(3-dimethyl aminopropyl)-N-(ethylaminocarbonyl)-6-(2-propenyl) ergoline-8β-carboxamide (cabergoline), a potent long lasting prolactin lowering agent

    International Nuclear Information System (INIS)

    Mantegani, S.; Brambilla, E.; Ermoli, A.; Fontana, E.; Angiuli, P.; Vicario, G.P.

    1991-01-01

    The syntheses of 3 H- and 14 C-labelled cabergoline and its analogues are described. Tritiated cabergoline ([ 3 H]cabergoline), namely N-(3-di-methylaminopropyl)-N-(ethylaminocarbonyl)-6-(2-[2,3- 3 H]-propenyl)ergoline-8β-carboxamide, was obtained, by catalytic reduction with tritium gas, according to two different synthetic procedures: A- a three step route, starting from 6-(2-propargyl)-dihydro lysergic acid-methyl ester gave [ 3 H]cabergoline, B - a one step route, starting from 1-ethyl-3-(3-dimethyl-aminopropyl)-3-[6'-(2-propargyl)ergoline-8'-carbonyl ]-urea 5' yielded [ 3 H]cabergoline. A modification of this last procedure also gave [ 3 H]dihydro cabergoline. The synthesis of [ 14 C]cabergoline was carried out, in a three step route, by addition of potassium [ 14 C]cyanide to 6-(2-propenyl)-8-chloroergoline to give the expected N-(dimethylaminopropyl)-N-(ethylaminocarbonyl)-6-(2-propenyl)-ergoline-8-[ 14 C]carboxamide, 97% radiochemically pure with a specific radioactivity of 2.09 GBq/mmol and an overall radiochemical yield of 16%. (author)

  1. Synthesis of tritium and carbon-14 labelled N-(3-dimethyl aminopropyl)-N-(ethylaminocarbonyl)-6-(2-propenyl) ergoline-8. beta. -carboxamide (cabergoline), a potent long lasting prolactin lowering agent

    Energy Technology Data Exchange (ETDEWEB)

    Mantegani, S.; Brambilla, E.; Ermoli, A.; Fontana, E.; Angiuli, P.; Vicario, G.P. (Farmitalia Carlo Erba s.r.l., Milan (Italy))

    1991-05-01

    The syntheses of {sup 3}H- and {sup 14}C-labelled cabergoline and its analogues are described. Tritiated cabergoline (({sup 3}H)cabergoline), namely N-(3-di-methylaminopropyl)-N-(ethylaminocarbonyl)-6-(2-(2,3-{sup 3}H)-propenyl)ergoline-8{beta}-carboxamide, was obtained, by catalytic reduction with tritium gas, according to two different synthetic procedures: A- a three step route, starting from 6-(2-propargyl)-dihydro lysergic acid-methyl ester gave ({sup 3}H)cabergoline, B - a one step route, starting from 1-ethyl-3-(3-dimethyl-aminopropyl)-3-(6'-(2-propargyl)ergoline-8'-carbonyl )-urea 5' yielded ({sup 3}H)cabergoline. A modification of this last procedure also gave ({sup 3}H)dihydro cabergoline. The synthesis of ({sup 14}C)cabergoline was carried out, in a three step route, by addition of potassium ({sup 14}C)cyanide to 6-(2-propenyl)-8-chloroergoline to give the expected N-(dimethylaminopropyl)-N-(ethylaminocarbonyl)-6-(2-propenyl)-ergoline-8-({sup 14}C)carboxamide, 97% radiochemically pure with a specific radioactivity of 2.09 GBq/mmol and an overall radiochemical yield of 16%. (author).

  2. Aniline is an inducer, and not a precursor, for indole derivatives in Rubrivivax benzoatilyticus JA2.

    Directory of Open Access Journals (Sweden)

    Mohammed Mujahid

    Full Text Available Rubrivivax benzoatilyticus JA2 and other anoxygenic photosynthetic bacteria produce indole derivatives when exposed to aniline, a xenobiotic compound. Though this phenomenon has been reported previously, the role of aniline in the production of indoles is still a biochemical riddle. The present study aims at understanding the specific role of aniline (as precursor or stimulator in the production of indoles and elucidating the biochemical pathway of indoles in aniline-exposed cells by using stable isotope approaches. Metabolic profiling revealed tryptophan accumulation only in aniline exposed cells along with indole 3-acetic acid (IAA and indole 3-aldehyde (IAld, the two major catabolites of tryptophan. Deuterium labelled aniline feeding studies revealed that aniline is not a precursor of indoles in strain JA2. Further, production of indoles only in aniline-exposed cells suggests that aniline is an indoles stimulator. In addition, production of indoles depended on the presence of a carbon source, and production enhanced when carbon sources were added to the culture. Isotope labelled fumarate feeding identified, fumarate as the precursor of indole, indicating de novo synthesis of indoles. Glyphosate (shikimate pathway inhibitor inhibited the indoles production, accumulation of tryptophan, IAA and IAld indicating that indoles synthesis in strain JA2 occurs via the de novo shikimate pathway. The up-regulation of anthranilate synthase gene and induction of anthranilate synthase activity correlated well with tryptophan production in strain JA2. Induction of tryptophan aminotransferase and tryptophan 2-monooxygenase activities corroborated well with IAA levels, suggesting that tryptophan catabolism occurs simultaneously in aniline exposed cells. Our study demonstrates that aniline (stress stimulates tryptophan/indoles synthesis via the shikimate pathway by possibly modulating the metabolic pathway.

  3. Treatment of wastewaters containing anilines using enzymes: an overview

    International Nuclear Information System (INIS)

    Mantha, R.; Biswas, N.; Taylor, K.E.; Bewtra, J.K.

    2002-01-01

    Aromatic amines are manufactured in a large scale for use in industries dealing with resins, dyes, plastics and rubber, pesticides and explosives. The majority of the production-related waste is either incinerated or released into the environment. The majority of them are highly toxic, carcinogenic or mutagenic and impose serious health hazards to mankind. Available conventional physical-chemical processes including activated carbon adsorption processes, solvent extraction processes, microbial degradation and various chemical-oxidation processes developed over the years are not selective in terms of the range of the aromatic pollutant removed during treatment. Thus, such treatment strategies are more economically suitable for treatment of dilute wastewaters and are invariably used as polishing steps. Enzymes such as peroxidases, in the presence of hydrogen peroxide, and laccases, in the presence of oxygen, catalyze the oxidation of a wide variety of phenols, biphenyls, anilines, benzidines and other related aromatic compounds. Various peroxidases and laccases have been used to treat wastewaters. With respect to anilines, the potential, scope and cost of enzymatic treatment is reviewed here and compared with conventional technology, e.g., the cost of enzymatic treatment using a crude enzyme preparation of soybean peroxidase was reported to be about $0.36/m 3 for synthetic wastewater containing 1 mM of aniline, compared to an activated sludge process of $1.05/m 3 and $1.31/m 3 for activated carbon process, while for p-toluidine, it was about $0.17/m 3 . Thus, through choice of enzyme and its mode of operation, treatment costs less than the conventional treatment strategies can be achieved. (author)

  4. Effect of gamma irradiation on nano polymer poly aniline

    International Nuclear Information System (INIS)

    Chan Yan Yhee

    2012-01-01

    Poly aniline (PANI) is a conductor polymer that investigated by a lot of researchers which display unique electric characteristic and widely applications. The objective in this research is to see the effect of gamma irradiation on PANI by using microemulsion method. Cation surfactant, cetyltrimethylammonium bromide, (CTAB) use in microemulsion method for dissolve aniline with distilled water. Mixture of aniline, ammonium persulfate (APS) as oxidizing agent and hydrochloric acid (HCL) into aqueous CTAB and magnetic bar stirrer applied at temperature of 3 degree Celsius for 3 hours to form PANI. The washing is done by using distilled water and ethanol to purify PANI. After washing the PANI are categories in two group, PANI aqueous solution and PANI powder. PANI aqueous solution irradiated with gamma irradiation from 0 kGy to 100 kGy doses in 10 kGy intervals while PANI powder are dried in oven before irradiated with gamma irradiation with same doses as PANI aqueous solution. These aqueous solution products are characterized by ultraviolet absorption spectroscopy (UV-Vis) which shows the electron transition π - π * and Microscope Electron Transmission (TEM) for morforlogy of PANI nanoparticles while PANI powder are characterized using Spectroscopy Fourier Transformation Intra-Red (FTIR) for the functional group, X-Ray Diffraction (XRD) to determine the crystalline peak and Field Emission Scanning Electron Microscope (FESEM) for morphology PANI nanoparticles. The effect of gamma irradiation nanoparticles are PANI aqueous solution produce aggregation and changing of PANI nanoparticles sizes while PANI powder produce fractures and distortion on PANI nanoparticles. (author)

  5. Direct C-H alkylation and indole formation of anilines with diazo compounds under rhodium catalysis.

    Science.gov (United States)

    Mishra, Neeraj Kumar; Choi, Miji; Jo, Hyeim; Oh, Yongguk; Sharma, Satyasheel; Han, Sang Hoon; Jeong, Taejoo; Han, Sangil; Lee, Seok-Yong; Kim, In Su

    2015-12-18

    The rhodium(III)-catalyzed direct functionalization of aniline C-H bonds with α-diazo compounds is described. These transformations provide a facile construction of ortho-alkylated anilines with diazo malonates or highly substituted indoles with diazo acetoacetates.

  6. Polyaniline: Aniline oxidation with strong and weak oxidants under various acidity

    Energy Technology Data Exchange (ETDEWEB)

    Bláha, Michal, E-mail: blaha@imc.cas.cz [Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6 (Czech Republic); Trchová, Miroslava; Bober, Patrycja; Morávková, Zuzana [Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6 (Czech Republic); Prokeš, Jan [Charles University, Faculty of Mathematics and Physics, 180 00 Prague 8 (Czech Republic); Stejskal, Jaroslav [Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6 (Czech Republic)

    2017-06-15

    Aniline was oxidized with three strong inorganic oxidants (ammonium peroxydisulfate, cerium(IV) sulfate, potassium dichromate), two weak inorganic oxidants (iron(III) chloride, silver nitrate), and one organic oxidant (p-benzoquinone) in aqueous solutions of methanesulfonic acid (MSA) of various concentration. Whereas oxidation of aniline with ammonium peroxydisulfate yielded high-molecular-weight conducting polyaniline (PANI) in the whole acidity range, the oxidation with cerium(IV) sulfate led also to a single product close to PANI with considerably lower molecular weight and lower conductivity. Potassium dichromate gave PANI only at high concentration of MSA. The use of iron(III) chloride yielded composite mixtures of PANI and low-molecular-weight aniline oligomers. The oxidation of aniline with silver nitrate led to composites of silver and an organic part, which was constituted either by aniline oligomers or conducting polyaniline or both. p-Benzoquinone as oxidant produced mainly aniline oligomers with poor conductivity and 2,5-dianilino-p-benzoquinone-like structure detected in FTIR and Raman spectra when oxidation proceeded with weak oxidants. A general model of oxidation with strong and weak oxidants was formulated. - Highlights: • Comparison of aniline oxidation with oxidants of different redox potential. • UV–vis, FTIR and Raman spectroscopies combined with size-exclusion chromatography. • The contents of polymer and oligomers were analyzed and discussed. • General model of aniline oxidation with strong and weak oxidants was formulated.

  7. Carbonization of aniline oligomers to electrically polarizable particles and their use in electrorheology

    Czech Academy of Sciences Publication Activity Database

    Plachý, T.; Sedlačík, M.; Pavlínek, V.; Trchová, Miroslava; Morávková, Zuzana; Stejskal, Jaroslav

    2014-01-01

    Roč. 256, 15 November (2014), s. 398-406 ISSN 1385-8947 R&D Projects: GA ČR GAP205/12/0911; GA ČR(CZ) GA13-08944S Institutional support: RVO:61389013 Keywords : aniline * aniline oligomers * carbonization Subject RIV: CD - Macromolecular Chemistry Impact factor: 4.321, year: 2014

  8. COMPUTATIONAL ELECTROCHEMISTRY: AQUEOUS ONE-ELECTRON OXIDATION POTENTIALS FOR SUBSTITUTED ANILINES

    Science.gov (United States)

    Semiempirical molecular orbital theory and density functional theory are used to compute one-electron oxidation potentials for aniline and a set of 21 mono- and di-substituted anilines in aqueous solution. Linear relationships between theoretical predictions and experiment are co...

  9. Synthesis and characterization of novel N-substituted poly aniline by Triton X-100

    International Nuclear Information System (INIS)

    Arsalani, N.; Khavei, M.; Entezami, A. A.

    2003-01-01

    A new N-substituted poly aniline is synthesized by insertion of polyether chain in the form of Triton X-100 onto the poly aniline backbone. In the preparation method, firstly the emeraldine base poly aniline was reacted with Na H to produce the N-anionic doped poly aniline and then contacted with chlorinated Triton X-100. The prepared N-substituted poly aniline was characterized by UV-vis, FTIR, 1 H NMR spectroscopy techniques and elemental analysis. The physical properties of synthesized polymer such as electrical conductivity, thermal and electro activity properties were also studied. The prepared polymer has good solubility in common organic solvents such as T HF and chloroform

  10. Conductive nano composites based on cellulose nano fiber coated poly aniline via in situ polymerization

    International Nuclear Information System (INIS)

    Silva, Michael J. da; Sanches, Alex O.; Malmonge, Luiz F.; Malmonge, Jose A.; Medeiros, Eliton S. de; Rosa, Morsyleide F.

    2011-01-01

    Cellulose nano fiber (CNF) was extracted by acid hydrolysis from cotton microfibril and nano composites of CNF/PANI-DBSA were obtained by in situ polymerization of aniline onto CNF. The ratios between DBSA/aniline and aniline/oxidant were varied and the nano composites were characterized by four probes direct current (dc) electrical conductivity, ultraviolet-visible (UV-Vis-NIR) and FTIR spectroscopy and X-ray diffraction (XRD). Electrical conductive about ∼10 -1 S/cm was research and was independent of DBSA/aniline molar ratio between 2-4 and the aniline/oxidant molar ratio between 1-5. X-ray patterns of the samples show crystalline peaks characteristic of cellulose I. The FTIR spectra confirmed the presence of PANI and CNF in all samples. (author)

  11. Molecular Interaction Study of some ortho and para Substituted Anilines with 1-Octanol

    Directory of Open Access Journals (Sweden)

    M. S. Manjunatha

    2010-01-01

    Full Text Available Interactions between ortho and para substituents of anilines such as chloroaniline, methylaniline and methoxyaniline with 1-octanol have been studied in carbon tetrachloride. The most likely association of complex between 1-octanol and substituents of anilines is 1:1 stoichiometric complex, through hydroxyl group of 1-octanol and amine group of ortho and para substituents of anilines. Interactions are studied on the bases of formation constant and free energy changes. Formation constant of the complex has been calculated using Nash method. The result shows that molecular interaction of 1-octanol as proton donor with methyl and chloride substitution of anilines in ortho position is smaller than the para position substitution of anilines. The results shows, the ability of acceptors is in the order p-methoxyaniline < o-chloroaniline

  12. Terrestrial fate of coal-liquid constituents: behavior of alkyl anilines in soil

    Energy Technology Data Exchange (ETDEWEB)

    Felice, L.J.; Zachara, J.M.; Rogers, J.E.

    1982-07-01

    The low molecular weight aromatic amines (anilines) are important water soluble constituents of coal liquids. The impact of anilines released to the terrestrial environment will largely depend on their mobility and persistence. Studies were conducted to investigate those processes governing the mobility and persistence of the alkylanilines, namely, soil sorption and chemical/microbial degradation. Soil sorption measurements were conducted on aniline and several methyl substituted anilines on A and B horizons of a soil profile collected from Davies County, Kentucky. The magnitude of sorption was large in all horizons. Sorption in the B horizons was larger than in the A horizon for many of the anilines studied, indicating the importance of both the mineral matrix and organic carbon content of the soil in determining the magnitude of sorption. Results of these measurements indicate that movement of the anilines through the soil would be significantly attenuated by sorption reactions. Aniline sorption measurement in the A horizon after removal of the organic matter and in the B/sub 22/ horizon after removal of amorphous iron oxides and crystalline iron oxides indicate that organic matter largely controls aniline sorption in the A horizon, while crystalline iron oxides and phyllosilicates are important in the B horizons. The effects of pH on aniline sorption was also examined and shown to have significant effects on the magnitude of sorption in both A and B horizons. Soil degradation studies using /sup 14/C-3-methylaniline as a model for alkyl aniline degradation show that 3-methylaniline is readily metabolized by soil microorganisms during the 32-day period examined.

  13. Determination of Aniline Degraded From Sudan I in Cloths

    International Nuclear Information System (INIS)

    Wei, C.K.; Fung, L.C.; Men, C.K.

    2013-01-01

    A method development for the determination of an aromatic amine degraded from an azo dye in cloths was carried out. Sodium dithionite was used to cleave the azo bond of Sudan I into its aromatic amines, and the amines, mainly aniline were analyzed using high performance liquid chromatography (HPLC) with UV detection. The efficiency of the reduction process of Sudan I, based on the degree of decolorisation of dye, was measured using the spectrophotometer. The optimized values of the reduction process was found effective when 1:1 ratio of 0.30 % sodium dithionite to Sudan I (dit/ Sud) was used at pH 8. The recovery percentage and relative standard deviation (R.S.D.) of this method was found to be 62.9 - 88.4 % and 7.6 - 21.5 %, respectively. The proposed method was tested on self-dyed cloth samples with Sudan I. Aniline released from the reduction of Sudan I was detected in the self-dyed cloth samples. The results of this study demonstrate the applicability of sodium dithionite for the reduction of the azo dye in the cloth samples. (author)

  14. Efficient treatment of aniline containing wastewater in bipolar membrane microbial electrolysis cell-Fenton system.

    Science.gov (United States)

    Li, Xiaohu; Jin, Xiangdan; Zhao, Nannan; Angelidaki, Irini; Zhang, Yifeng

    2017-08-01

    Aniline-containing wastewater can cause significant environmental problems and threaten the humans's life. However, rapid degradation of aniline with cost-efficient methods remains a challenge. In this work, a novel microbial electrolysis cell with bipolar membrane was integrated with Fenton reaction (MEC-Fenton) for efficient treatment of real wastewater containing a high concentration (4460 ± 52 mg L -1 ) of aniline. In this system, H 2 O 2 was in situ electro-synthesized from O 2 reduction on the graphite cathode and was simultaneously used as source of OH for the oxidation of aniline wastewater under an acidic condition maintained by the bipolar membrane. The aniline was effectively degraded following first-order kinetics at a rate constant of 0.0166 h -1 under an applied voltage of 0.5 V. Meanwhile, a total organic carbon (TOC) removal efficiency of 93.1 ± 1.2% was obtained, revealing efficient mineralization of aniline. The applicability of bipolar membrane MEC-Fenton system was successfully demonstrated with actual aniline wastewater. Moreover, energy balance showed that the system could be a promising technology for removal of biorefractory organic pollutants from wastewaters. Copyright © 2017 Elsevier Ltd. All rights reserved.

  15. A Modular Flow Design for the meta‐Selective C−H Arylation of Anilines

    Science.gov (United States)

    Gemoets, Hannes P. L.; Laudadio, Gabriele; Verstraete, Kirsten; Hessel, Volker

    2017-01-01

    Abstract Described herein is an effective and practical modular flow design for the meta‐selective C−H arylation of anilines. The design consists of four continuous‐flow modules (i.e., diaryliodonium salt synthesis, meta‐selective C−H arylation, inline copper extraction, and aniline deprotection) which can be operated either individually or consecutively to provide direct access to meta‐arylated anilines. With a total residence time of 1 hour, the desired product could be obtained in high yield and excellent purity without the need for column chromatography, and the residual copper content meets the standards for parenterally administered pharmaceutical substances. PMID:28543979

  16. Silicene Catalyzed Reduction of Nitrobenzene to Aniline: a Computational Study

    Science.gov (United States)

    Morrissey, Christopher; He, Haiying

    The reduction of nitrobenzene to aniline has a broad range of applications in the production of rubbers, dyes, agrochemicals, and pharmaceuticals. Currently, use of metal catalysts is the most popular method of performing this reaction on a large scale. These metal catalysts usually require high-temperature and/or high-pressure reaction conditions, and produce hazardous chemicals. This has led to a call for more environmentally friendly nonmetal catalysts. Recent studies suggest that silicene, the recently discovered silicon counterpart of graphene, could potentially work as a nonmetal catalyst due to its unique electronic property and strong interactions with molecules containing nitrogen and oxygen. In this computational study, we have investigated the plausibility of using silicene as a catalyst for the reduction of nitrobenzene. Possible reaction mechanisms will be discussed with a highlight of the difference between silicene and metal catalysts. . All calculations were performed in the framework of density functional theory.

  17. The N-salicylidene aniline mesogen: Microscopic and macroscopic properties

    International Nuclear Information System (INIS)

    Nesrullazade, A.

    2004-01-01

    The vast majority of compounds exhibiting Iiquid crystalline phases may be regarded as having a rigid molecular central group with one or two flexible terminal alkyl or alkyloxy chains. The N-saIicyIidene anilines are very interesting and important materials both from fundamental and application points of view. These materials are on the one hand the ligands used to obtain metal containing complexes and on the other hand they are materials having the thermotropic mesomorphism. In this work we present investigations of microscopic and macroscopic properties of the 4-(Octyloxy)-N-(4-hexylphenyl)-2-hydrobenzaIimine (8SA) compound which was synthesized by our group. The 8SA compound shows the smectic C and nematic mesophases. These mesophases are enantiotropic and display specific confocal and schlieren textures, respectively. Thermotropic and thermodynamical properties of the straight and reverse phase transitions between smectic C and nematic mesophases and between nematic mesophase and isotropic liquid have been investigated

  18. Magnetism of aniline modified graphene-based materials

    Science.gov (United States)

    Komlev, A. A.; Makarova, T. L.; Lahderanta, E.; Semenikhin, P. V.; Veinger, A. I.; Tisnek, T. V.; Magnani, G.; Bertoni, G.; Pontiroli, D.; Ricco, M.

    2016-10-01

    The possibility of producing magnetic graphene nanostructures by functionalization with aromatic radicals has been investigated. Functionalization of graphene basal plane was performed with three types of anilines: 4-bromoaniline, 4-nitroaniline and 4-chloroaniline. The samples were examined by composition analysis with energy-dispersive X-ray spectroscopy and magnetic measurements by SQUID magnetometry and electron paramagnetic resonance. Initial graphene was produced by thermal exfoliation. Both pristine and functionalized samples demonstrate strong paramagnetic contribution at low temperatures, which originates from intrinsic defects. Attachment of an organic molecule with the formation of a covalent bond with carbon atom on the basal plane generates a delocalized spin in the graphene π - electron system. Nitroaniline proved to be the most suitable and sufficiently reactive to attach to the basal plane carbon atoms in large amounts. Functionalization of graphene with nitroaniline resulted in appearance both ferromagnetic and antiferromagnetic features with a clear antiferromagnetic transition near 120 K.

  19. Pharmacokinetics and N-acetylation metabolism of S-methyl-l-cysteine and trans-S-1-propenyl-l-cysteine in rats and dogs.

    Science.gov (United States)

    Amano, Hirotaka; Kazamori, Daichi; Itoh, Kenji

    2016-11-01

    1. Pharmacokinetics and N-acetylation metabolism of S-methyl-L-cysteine (SMC) and trans-S-1-propenyl-L-cysteine (S1PC) were examined in rats and dogs. SMC and S1PC (2-5 mg/kg) were well absorbed in both species with high bioavailability (88-100%). 2. SMC and S1PC were excreted only to a small extent in the urine of rats and dogs. The small renal clearance values (l/h/kg) indicated the extensive renal reabsorption of SMC and S1PC, which potentially contributed to their long elimination half-lives (>5 h) in dogs. 3. S1PC, but not SMC, underwent N-acetylation extensively in vivo, which can be explained by the relative activities of N-acetylation of S1PC/SMC and deacetylation of their N-acetylated forms, N-acetyl-S1PC/N-acetyl-SMC, in the liver and kidney in vitro. The activities for S1PC N-acetylation were similar to or higher than those for N-acetyl-S1PC deacetylation in liver S9 fractions of rat and dog, whereas liver and kidney S9 fractions of rat and dog had little activity for SMC N-acetylation or considerably higher activities for N-acetyl-SMC deacetylation. 4. Our study demonstrated that the pharmacokinetics of SMC and S1PC in rats and dogs was characterized by high bioavailability and extensive renal reabsorption; however, the extent of undergoing the N-acetylation metabolism was extremely different between SMC and S1PC.

  20. Intermolecular vibronic spectroscopy of small van der Waals clusters: Phenol- and aniline-(argon)2 complexes

    International Nuclear Information System (INIS)

    Schmidt, M.; Mons, M.; Le Calve, J.

    1990-01-01

    We report the clear observation and assignment of the symmetric stretching and bending van der Waals modes in two three-body C 2ν complexes, phenol- and aniline-(Ar) 2 , using resonant two-photon ionization. (orig.)

  1. Synthesis of poly(aniline-co-o-toluidine) coatings on copper

    Energy Technology Data Exchange (ETDEWEB)

    Raotole, Pritee, E-mail: priteeraotole@gmail.com; Patil, V. T.; Huse, V. R.; Chaudhari, A. L. [MGSM’s Arts, Science and Commerce, College, Chopda, Dist-Jalgaon 425107, Maharashtra (India); Raotole, Mahesh [Sharacchandrika Suresh Patil, Institute of Technology, Polytechnic, Chopda, Dist-Jalgaon, 425107, Maharashtra (India)

    2016-05-06

    The corrosion protective poly(aniline-co-o-toluidine) (PAOT) coatings were synthesized on copper (Cu) by the electrochemical copolymerization of aniline with o-toluidine under cyclic voltammetry conditions. Aqueous oxalate solutions were used as the supporting electrolytes for the synthesis of PAOT coatings on Cu. The resulting coatings were characterized by different spectroscopic techniques, cyclic voltammetry, ultraviolet-visible absorption spectroscopy, Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (NMR), and scanning electron microscopy. The Fourier Transform InfraRed (FTIR) spectroscopy and Nuclear Magnetic Resonance (NMR) spectroscopy studies reveal that the copolymerization of aniline and o-toluidine takes place on Cu substrates from an aqueous oxalate solutions and resulting in PAOT copolymer, there are more o-toluidine units than aniline units.

  2. Charge transport and dielectric relaxation processes in anilin-based oligomers

    Czech Academy of Sciences Publication Activity Database

    Mrlík, M.; Moučka, R.; Ilčíková, M.; Bober, Patrycja; Kazantseva, N.; Špitálský, Z.; Trchová, Miroslava; Stejskal, Jaroslav

    2014-01-01

    Roč. 192, June (2014), s. 37-42 ISSN 0379-6779 Institutional support: RVO:61389013 Keywords : aniline-based oligomers * conductivity * dielectric properties Subject RIV: CD - Macromolecular Chemistry Impact factor: 2.252, year: 2014

  3. C-N bond cleavage of anilines by a (salen)ruthenium(VI) nitrido complex.

    Science.gov (United States)

    Man, Wai-Lun; Xie, Jianhui; Pan, Yi; Lam, William W Y; Kwong, Hoi-Ki; Ip, Kwok-Wa; Yiu, Shek-Man; Lau, Kai-Chung; Lau, Tai-Chu

    2013-04-17

    We report experimental and computational studies of the facile oxidative C-N bond cleavage of anilines by a (salen)ruthenium(VI) nitrido complex. We provide evidence that the initial step involves nucleophilic attack of aniline at the nitrido ligand of the ruthenium complex, which is followed by proton and electron transfer to afford a (salen)ruthenium(II) diazonium intermediate. This intermediate then undergoes unimolecular decomposition to generate benzene and N2.

  4. Ru(III) catalyzed permanganate oxidation of aniline at environmentally relevant pH.

    Science.gov (United States)

    Zhang, Jing; Zhang, Ying; Wang, Hui; Guan, Xiaohong

    2014-07-01

    Ru(III) was employed as catalyst for aniline oxidation by permanganate at environmentally relevant pH for the first time. Ru(III) could significantly improve the oxidation rate of aniline by 5-24 times with its concentration increasing from 2.5 to 15 μmol/L. The reaction of Ru(III) catalyzed permanganate oxidation of aniline was first-order with respect to aniline, permanganate and Ru(III), respectively. Thus the oxidation kinetics can be described by a third-order rate law. Aniline degradation by Ru(III) catalyzed permanganate oxidation was markedly influenced by pH, and the second-order rate constant (ktapp) decreased from 643.20 to 2.67 (mol/L)⁻¹sec⁻¹ with increasing pH from 4.0 to 9.0, which was possibly due to the decrease of permanganate oxidation potential with increasing pH. In both the uncatalytic and catalytic permanganate oxidation, six byproducts of aniline were identified in UPLC-MS/MS analysis. Ru(III), as an electron shuttle, was oxidized by permanganate to Ru(VI) and Ru(VII), which acted the co-oxidants for decomposition of aniline. Although Ru(III) could catalyze permanganate oxidation of aniline effectively, dosing homogeneous Ru(III) into water would lead to a second pollution. Therefore, efforts would be made to investigate the catalytic performance of supported Ru(III) toward permanganate oxidation in our future study. Copyright © 2014. Published by Elsevier B.V.

  5. Photocatalytic Degradation of Aniline Using TiO2 Nanoparticles in a Vertical Circulating Photocatalytic Reactor

    Directory of Open Access Journals (Sweden)

    F. Shahrezaei

    2012-01-01

    Full Text Available Photocatalytic degradation of aniline in the presence of titanium dioxide (TiO2 and ultraviolet (UV illumination was performed in a vertical circulating photocatalytic reactor. The effects of catalyst concentration (0–80 mg/L, initial pH (2–12, temperature (293–323 K, and irradiation time (0–120 min on aniline photodegradation were investigated in order to obtain the optimum operational conditions. The results reveal that the aniline degradation efficiency can be effectively improved by increasing pH from 2 to 12 and temperature from 313 to 323 K. Besides, the effect of temperature on aniline photo degradation was found to be unremarkable in the range of 293–313 K. The optimum catalyst concentration was about 60 mg/L. The Langmuir Hinshelwood kinetic model could successfully elucidate the effects of the catalyst concentration, pH, and temperature on the rate of heterogeneous photooxidation of aniline. The data obtained by applying the Langmuir Hinshelwood treatment are consistent with the available kinetic parameters. The activated energy for the photocatalytic degradation of aniline is 20.337 kj/mol. The possibility of the reactor use in the treatment of a real petroleum refinery wastewater was also investigated. The results of the experiments indicated that it can therefore be potentially applied for the treatment of wastewater contaminated by different organic pollutants.

  6. Microbial mineralization of ring-substituted anilines through an ortho-cleavage pathway.

    Science.gov (United States)

    Zeyer, J; Wasserfallen, A; Timmis, K N

    1985-08-01

    Moraxella sp. strain G is able to utilize as sole source of carbon and nitrogen aniline, 4-fluoroaniline, 2-chloroaniline, 3-chloroaniline, 4-chloroaniline (PCA), and 4-bromoaniline but not 4-iodoaniline, 4-methylaniline, 4-methoxyaniline, or 3,4-dichloroaniline. The generation time on PCA was 6 h. The pathway for the degradation of PCA was investigated by analysis of catabolic intermediates and enzyme activities. Mutants of strain G were isolated to enhance the accumulation of specific pathway intermediates. PCA was converted by an aniline oxygenase to 4-chlorocatechol, which in turn was degraded via a modified ortho-cleavage pathway. Synthesis of the aniline oxygenase was inducible by various anilines. This enzyme exhibited a broad substrate specificity. Its specific activity towards substituted anilines seemed to be correlated more with the size than with the electron-withdrawing effect of the substituent and was very low towards anilines having substituents larger than iodine or a methyl group. The initial enzyme of the modified ortho-cleavage pathway, catechol 1,2-dioxygenase, had similar characteristics to those of corresponding enzymes of pathways for the degradation of chlorobenzoic acid and chlorophenol, that is, a broad substrate specificity and high activity towards chlorinated and methylated catechols.

  7. Oxidative DNA damage and its repair in rat spleen following subchronic exposure to aniline

    International Nuclear Information System (INIS)

    Ma Huaxian; Wang Jianling; Abdel-Rahman, Sherif Z.; Boor, Paul J.; Khan, M. Firoze

    2008-01-01

    The mechanisms by which aniline exposure elicits splenotoxic response, especially the tumorigenic response, are not well-understood. Splenotoxicity of aniline is associated with iron overload and generation of reactive oxygen species (ROS) which can cause oxidative damage to DNA, proteins and lipids (oxidative stress). 8-Hydroxy-2'-deoxyguanosine (8-OHdG) is one of the most abundant oxidative DNA lesions resulting from ROS, and 8-oxoguanine glycosylase 1 (OGG1), a specific DNA glycosylase/lyase enzyme, plays a key role in the removal of 8-OHdG adducts. This study focused on examining DNA damage (8-OHdG) and repair (OGG1) in the spleen in an experimental condition preceding a tumorigenic response. To achieve that, male Sprague-Dawley rats were subchronically exposed to aniline (0.5 mmol/kg/day via drinking water for 30 days), while controls received drinking water only. Aniline treatment led to a significant increase in splenic oxidative DNA damage, manifested as a 2.8-fold increase in 8-OHdG levels. DNA repair activity, measured as OGG1 base excision repair (BER) activity, increased by ∼ 1.3 fold in the nuclear protein extracts (NE) and ∼ 1.2 fold in the mitochondrial protein extracts (ME) of spleens from aniline-treated rats as compared to the controls. Real-time PCR analysis for OGG1 mRNA expression in the spleen revealed a 2-fold increase in expression in aniline-treated rats than the controls. Likewise, OGG1 protein expression in the NEs of spleens from aniline-treated rats was ∼ 1.5 fold higher, whereas in the MEs it was ∼ 1.3 fold higher than the controls. Aniline treatment also led to stronger immunostaining for both 8-OHdG and OGG1 in the spleens, confined to the red pulp areas. It is thus evident from our studies that aniline-induced oxidative stress is associated with increased oxidative DNA damage. The BER pathway was also activated, but not enough to prevent the accumulation of oxidative DNA damage (8-OHdG). Accumulation of mutagenic oxidative

  8. Photochemical removal of aniline in aqueous solutions: switching from photocatalytic degradation to photo-enhanced polymerization recovery.

    Science.gov (United States)

    Tang, Heqing; Li, Jing; Bie, Yeqiang; Zhu, Lihua; Zou, Jing

    2010-03-15

    Organic pollutants may be treated by either a degradation process or a recovery process in the view point of sustainable chemistry. Photocatalytic removal of aniline was investigated in aqueous solutions. It was found that the photocatalytic oxidation of aniline resulted in its degradation or polymerization, depending on its concentration. Hence a new treatment strategy was proposed in combination of photocatalytic degradation and polymerization, where the polymerization was in fact a recovery process. When aniline concentration was as low as 0.1 mmol L(-1), it was possible to photocatalytically degrade aniline, which could be further enhanced by increasing solution pH, modifying TiO(2) surface with the addition of anions, or coupling with the photoreduction of added oxidants. When aniline concentration was increased to about 1 mmol L(-1), the photocatalytic oxidation was observed to yield the polymerization of aniline, leading to nanocomposites of polyaniline (PAN) and TiO(2). Alternatively, the photo-enhanced chemical polymerization of aniline at higher concentrations (>or=50 mmol L(-1)) in the presence of chemical oxidants produced PAN nanostructures. The conversion of pollutant aniline to valuable PAN nanostructures or nano-PAN/TiO(2) composites is suggestive for possible applications in the treatment of aniline wastewaters as a sustainable environmental protection measure. (c) 2009 Elsevier B.V. All rights reserved.

  9. Magnetism of aniline modified graphene-based materials

    Energy Technology Data Exchange (ETDEWEB)

    Komlev, A.A., E-mail: KomlevAnton@hotmail.com [St. Petersburg State Electrotechnical University, St. Petersburg, 197376 (Russian Federation); Lappeenranta University of Technology, 53851 Lappeenranta (Finland); Makarova, T.L. [St. Petersburg State Electrotechnical University, St. Petersburg, 197376 (Russian Federation); Ioffe Physico-Technical Institute, 194021 St. Petersburg (Russian Federation); Lahderanta, E. [St. Petersburg State Electrotechnical University, St. Petersburg, 197376 (Russian Federation); Semenikhin, P.V.; Veinger, A.I.; Tisnek, T.V. [Ioffe Physico-Technical Institute, 194021 St. Petersburg (Russian Federation); Magnani, G. [Università degli studi di Parma, Dipartimento di Fisica e Scienze della Terra, 43124 Parma (Italy); Bertoni, G. [Istituto dei Materiali per l’Elettronica e il Magnetismo(IMEM-CNR), 43124 Parma (Italy); Pontiroli, D.; Ricco, M. [Università degli studi di Parma, Dipartimento di Fisica e Scienze della Terra, 43124 Parma (Italy)

    2016-10-01

    The possibility of producing magnetic graphene nanostructures by functionalization with aromatic radicals has been investigated. Functionalization of graphene basal plane was performed with three types of anilines: 4-bromoaniline, 4-nitroaniline and 4-chloroaniline. The samples were examined by composition analysis with energy-dispersive X-ray spectroscopy and magnetic measurements by SQUID magnetometry and electron paramagnetic resonance. Initial graphene was produced by thermal exfoliation. Both pristine and functionalized samples demonstrate strong paramagnetic contribution at low temperatures, which originates from intrinsic defects. Attachment of an organic molecule with the formation of a covalent bond with carbon atom on the basal plane generates a delocalized spin in the graphene π – electron system. Nitroaniline proved to be the most suitable and sufficiently reactive to attach to the basal plane carbon atoms in large amounts. Functionalization of graphene with nitroaniline resulted in appearance both ferromagnetic and antiferromagnetic features with a clear antiferromagnetic transition near 120 K. - Highlights: • Graphene was produced and functionalized by chloro-, bromo- and nitroaniline. • Nitroaniline was found to be the most suitable compound for functionalization. • Both SQUID and EPR revealed a carbon-related antiferromagnetic transition near 120 K. • Antiferomagnetic interactions are attributed to the extended defects on basal plane.

  10. Magnetism of aniline modified graphene-based materials

    International Nuclear Information System (INIS)

    Komlev, A.A.; Makarova, T.L.; Lahderanta, E.; Semenikhin, P.V.; Veinger, A.I.; Tisnek, T.V.; Magnani, G.; Bertoni, G.; Pontiroli, D.; Ricco, M.

    2016-01-01

    The possibility of producing magnetic graphene nanostructures by functionalization with aromatic radicals has been investigated. Functionalization of graphene basal plane was performed with three types of anilines: 4-bromoaniline, 4-nitroaniline and 4-chloroaniline. The samples were examined by composition analysis with energy-dispersive X-ray spectroscopy and magnetic measurements by SQUID magnetometry and electron paramagnetic resonance. Initial graphene was produced by thermal exfoliation. Both pristine and functionalized samples demonstrate strong paramagnetic contribution at low temperatures, which originates from intrinsic defects. Attachment of an organic molecule with the formation of a covalent bond with carbon atom on the basal plane generates a delocalized spin in the graphene π – electron system. Nitroaniline proved to be the most suitable and sufficiently reactive to attach to the basal plane carbon atoms in large amounts. Functionalization of graphene with nitroaniline resulted in appearance both ferromagnetic and antiferromagnetic features with a clear antiferromagnetic transition near 120 K. - Highlights: • Graphene was produced and functionalized by chloro-, bromo- and nitroaniline. • Nitroaniline was found to be the most suitable compound for functionalization. • Both SQUID and EPR revealed a carbon-related antiferromagnetic transition near 120 K. • Antiferomagnetic interactions are attributed to the extended defects on basal plane.

  11. An Enzyme Switch Employing Direct Electrochemical Communication between Horseradish Peroxidase and a Poly(aniline) Film.

    Science.gov (United States)

    Bartlett, P N; Birkin, P R; Wang, J H; Palmisano, F; De Benedetto, G

    1998-09-01

    An enzyme switch, or microelectrochemical enzyme transistor, responsive to hydrogen peroxide was made by connecting two carbon band electrodes (∼10 μm wide, 4.5 mm long separated by a 20-μm gap) with an anodically grown film of poly(aniline). Horseradish peroxidase (EC 1.11.1.7) was either adsorbed onto the poly(aniline) film or immobilized in an insulating poly(1,2-diaminobenzene) polymer grown electrochemically on top of the poly(aniline) film to complete the device. In the completed device, the conductivity of the poly(aniline) film changes from conducting (between - 0.05 and + 0.3 V vs SCE at pH 5) to insulating (>+0.3 V vs SCE at pH 5) on addition of hydrogen peroxide. The change in conductivity is brought about by oxidation of the poly(aniline) film by direct electrochemical communication between the enzyme and the conducting polymer. This was confirmed by measuring the potential of the poly(aniline) film during switching of the conductivity in the presence of hydrogen peroxide. The devices can be reused by rereducing the poly(aniline) electrochemically to a potential below +0.3 V vs SCE. A blind test showed that the device can be used to determine unknown concentrations of H(2)O(2) in solution and that, when used with hydrogen peroxide concentrations below 0.5 mmol dm(-)(3), the same device maybe reused several times. The possible development of devices of this type for use in applications requiring the measurement of low levels of hydrogen peroxide or horseradish peroxidase is discussed.

  12. A facile route to the synthesis of anilinic electroactive colloidal hydrogels for neural tissue engineering applications.

    Science.gov (United States)

    Zarrintaj, Payam; Urbanska, Aleksandra M; Gholizadeh, Saman Seyed; Goodarzi, Vahabodin; Saeb, Mohammad Reza; Mozafari, Masoud

    2018-04-15

    An innovative drug-loaded colloidal hydrogel was synthesized for applications in neural interfaces in tissue engineering by reacting carboxyl capped aniline dimer and gelatin molecules. Dexamethasone was loaded into the gelatin-aniline dimer solution as a model drug to form an in situ drug-loaded colloidal hydrogel. The conductivity of the hydrogel samples fluctuated around 10 -5  S/cm which appeared suitable for cellular activities. Cyclic voltammetry was used for electroactivity determination, in which 2 redox states were observed, suggesting that the short chain length and steric hindrance prevented the gel from achieving a fully oxidized state. Rheological data depicted the modulus decreasing with aniline dimer increment due to limited hydrogen bonds accessibility. Though the swelling ratio of pristine gelatin (600%) decreased by the introduction and increasing the concentration of aniline dimer because of its hydrophobic nature, it took the value of 300% at worst, which still seems promising for drug delivery uses. Degradation rate of hydrogel was similarly decreased by adding aniline dimer. Drug release was evaluated in passive and stimulated patterns demonstrating tendency of aniline dimer to form a vesicle that controls the drug release behavior. The optimal cell viability, proper cell attachment and neurite extension was achieved in the case of hydrogel containing 10 wt% aniline dimer. Based on tissue/organ behavior, it was promisingly possible to adjust the characteristics of the hydrogels for an optimal drug release. The outcome of this simple and effective approach can potentially offer additional tunable characteristics for recording and stimulating purposes in neural interfaces. Copyright © 2018 Elsevier Inc. All rights reserved.

  13. Disorder of G2-M Checkpoint Control in Aniline-Induced Cell Proliferation in Rat Spleen.

    Directory of Open Access Journals (Sweden)

    Jianling Wang

    Full Text Available Aniline, a toxic aromatic amine, is known to cause hemopoietic toxicity both in humans and animals. Aniline exposure also leads to toxic response in spleen which is characterized by splenomegaly, hyperplasia, fibrosis and the eventual formation of tumors on chronic in vivo exposure. Previously, we have shown that aniline exposure leads to iron overload, oxidative DNA damage, and increased cell proliferation, which could eventually contribute to a tumorigenic response in the spleen. Despite our demonstration that cell proliferation was associated with deregulation of G1 phase cyclins and increased expression of G1 phase cyclin-dependent kinases (CDKs, molecular mechanisms, especially the regulation of G2 phase and contribution of epigenetic mechanisms in aniline-induced splenic cellular proliferation remain largely unclear. This study therefore, mainly focused on the regulation of G2 phase in an animal model preceding a tumorigenic response. Male Sprague-Dawley rats were given aniline (0.5 mmol/kg/day in drinking water or drinking water only (controls for 30 days, and expression of G2 phase cyclins, CDK1, CDK inhibitors and miRNAs were measured in the spleen. Aniline treatment resulted in significant increases in cell cycle regulatory proteins, including cyclins A, B and CDK1, particularly phosphor-CDK1, and decreases in CDK inhibitors p21 and p27, which could promote the splenocytes to go through G2/M transition. Our data also showed upregulation of tumor markers Trx-1 and Ref-1 in rats treated with aniline. More importantly, we observed lower expression of miRNAs including Let-7a, miR-15b, miR24, miR-100 and miR-125, and greater expression of CDK inhibitor regulatory miRNAs such as miR-181a, miR-221 and miR-222 in the spleens of aniline-treated animals. Our findings suggest that significant increases in the expression of cyclins, CDK1 and aberrant regulation of miRNAs could lead to an accelerated G2/M transition of the splenocytes, and

  14. Biosorption of aniline violet from aqueous solution on moringa oleifera saw dust (abstract)

    International Nuclear Information System (INIS)

    Javed, T.; Mirza, M.L.

    2011-01-01

    Batch adsorption studies were carried out to evaluate the potential of Moringa Oleifera wood saw dust for the removal of aniline violet dye from aqueous solution by optimizing different parameters such as effect of shaking time, adsorbent dose, initial adsorbate concentration etc. The experimental data was subjected to different types of linearized isotherm models such as Freundlich, Langmuir and Dubinin-Radushkevich. The Freundlich isotherm was fitted well with the data. The maximum adsorption capacity of 8.92 m mol./g of aniline violet has been observed through Freundlich isotherm by using the optimized parameters of 50 mg of adsorbent, 5 minutes of shaking time at room temperature of 25 deg. C. The sorption mean free energy from Dubinin-Radushkevich isotherm is 13.36 kJ mol 1 indicating chemisorption. Pseudo-first and Pseudo-second order kinetics models were tested for the adsorption of 1.23 X 10/sup -5) mol L/sup -1) of aniline violet onto Moringa Oleifera wood saw dust. The experimental data fitted well for Pseudo-second order model with coefficient of correlation R/sup 2/ greater or equal to 0.999. The uptake of aniline violet was also studied with the rise in temperature. Thermodynamic parameters have been evaluated and the adsorption process seems to be endothermic. The results indicate that the Moringa Oleifera wood saw dust is an efficient adsorbent for aniline violet from aqueous solutions. (author)

  15. Catalytic wet air oxidation of aniline with nanocasted Mn-Ce-oxide catalyst.

    Science.gov (United States)

    Levi, R; Milman, M; Landau, M V; Brenner, A; Herskowitz, M

    2008-07-15

    The catalytic wet air oxidation of aqueous solution containing 1000 ppm aniline was conducted in a trickle-bed reactor packed with a novel nanocasted Mn-Ce-oxide catalyst (surface area of 300 m2/g) prepared using SBA-15 silica as a hard template. A range of liquid hourly space velocities (5-20 h(-1)) and temperatures (110-140 degrees C) at 10 bar of oxygen were tested. The experiments were conducted to provide the intrinsic performance of the catalysts. Complete aniline conversion, 90% TOC conversion, and 80% nitrogen mineralization were achieved at 140 degrees C and 5 h(-1). Blank experiments yielded relatively low homogeneous aniline (<35%) and negligible TOC conversions. Fast deactivation of the catalysts was experienced due to leaching caused by complexation with aniline. Acidification of the solution with HCI (molar HCI to aniline ratio of 1.2) was necessary to avoid colloidization and leaching of the nanoparticulate catalyst components. The catalyst displayed stable performance for over 200 h on stream.

  16. Probing the molecular determinants of aniline dioxygenase substrate specificity by saturation mutagenesis.

    Science.gov (United States)

    Ang, Ee L; Obbard, Jeffrey P; Zhao, Huimin

    2007-02-01

    Aniline dioxygenase is a multicomponent Rieske nonheme-iron dioxygenase enzyme isolated from Acinetobacter sp. strain YAA. Saturation mutagenesis of the substrate-binding pocket residues, which were identified using a homology model of the alpha subunit of the terminal dioxygenase (AtdA3), was used to probe the molecular determinants of AtdA substrate specificity. The V205A mutation widened the substrate specificity of aniline dioxygenase to include 2-isopropylaniline, for which the wild-type enzyme has no activity. The V205A mutation also made 2-isopropylaniline a better substrate for the enzyme than 2,4-dimethylaniline, a native substrate of the wild-type enzyme. The I248L mutation improved the activity of aniline dioxygenase against aniline and 2,4-dimethylaniline approximately 1.7-fold and 2.1-fold, respectively. Thus, it is shown that the alpha subunit of the terminal dioxygenase indeed plays a part in the substrate specificity as well as the activity of aniline dioxygenase. Interestingly, the equivalent residues of V205 and I248 have not been previously reported to influence the substrate specificity of other Rieske dioxygenases. These results should facilitate future engineering of the enzyme for bioremediation and industrial applications.

  17. [Removal Kinetics and Mechanism of Aniline by Manganese-oxide-modified Diatomite].

    Science.gov (United States)

    Xiao, Shao-dan; Liu, Lu; Jiang, Li-ying; Chen, Jian-meng

    2015-06-01

    A novel rapid green one-step method was developed for the preparation of manganese modified diatomite (Mn-D) by treating roasted diatomite with an acidic permanganate solution. The effects of calcination temperature and mass ratio of KMnO4 and diatomite (p) on aniline removal efficiency of Mn-D were investigated. The removal kinetics and mechanism of aniline by Mn-D were also discussed. The results showed that when the optimal calcination temperature was 450 degrees C, p was 1.6, and the loading amounts of δ-MnO2 was 0.82 g x g(-1), Mn-D had a great performance for aniline removal, and more than 80% of aniline was adsorbed within 10 minutes, accompanied with the release of Mn2+. In acidic conditions, the adsorption process on Mn-D followed pseudo-second-order and was mainly controlled by intra-particle diffusion. The best fitting of the experimental adsorption data was given by the Freundlich equation. Gas chromatograph-mass spectrometer was applied to identify the reaction intermediates at different times, and azobenzene was found to be the main reaction intermediate in the degradation system. Based on the above observations, the possible degradation pathway of aniline by Mn-D was proposed.

  18. Removal of aniline and phenol from water using raw and aluminum hydroxide-modified diatomite.

    Science.gov (United States)

    Wu, C D; Zhang, J Y; Wang, L; He, M H

    2013-01-01

    The feasibility of using raw diatomite and aluminum hydroxide-modified diatomite (Al-diatomite) for removal of aniline and phenol from water was investigated. Their physicochemical characteristics such as pHsolution, point of zero charge (pHPZC), surface area, Fourier transform infrared (FT-IR) and scanning electron microscopy was determined. After the raw diatomite was modified, the surface area of Al-diatomite increases from 26.67 to 82.65 m(2) g(-1). The pHPZC and pHsolution (10%) occurred around pH 5.2 and pH 8.6, respectively. The removal rates of aniline and phenol on diatomite and Al-diatomite decreased with increasing solution pH, while surface charge density decreased. The adsorption of aniline and phenol on diatomite presented a good fit to the Langmuir and Freundlich models, but the models are not fit to forecast the adsorption of aniline and phenol on Al-diatomite. The study indicated that electrostatic interaction was a dominating mechanism of aniline and phenol sorption onto Al-diatomite.

  19. Poly aniline synthesized in pilot scale: structural and morphological characteristics

    Energy Technology Data Exchange (ETDEWEB)

    Mazzeu, Maria Alice Carvalho; Goncalves, Emerson Sarmento, E-mail: aie.mzz@hotmail.com [Instituto Tecnologico de Aeronautica (ITA), Sao Jose dos Campos, SP (Brazil); Gama, Adriana Medeiros [Instituto de Aeronautica e Espaco (IAE), Sao Jose dos Campos, SP (Brazil); Baldan, Mauricio Ribeiro [Instituto Nacional de Pesquisas Espaciais (INPE), Sao Jose dos Campos, SP (Brazil); Faria, Lohana Komorek [Universidade do Vale do Paraiba (UNIVAP), Sao Jose dos Campos, SP (Brazil)

    2016-07-01

    Full text: Among various conducting polymers, poly aniline (PAni) has received wide-spread attention because of its outstanding properties including simple and reversible doping–dedoping chemistry, stable electrical conduction mechanisms, high environmental stability and ease of synthesis [1]. Increasing applications require PAni at industrial scale and optimization of manufacturing processes are essential for this purpose. Since pilot scale influences hydrodynamics of the polymerizations system [2], pilot scale is an important instrument for evaluating amendments in the process. In this work, polyaniline was synthesized on pilot scale, with variation of reaction time for every synthesis, keeping the other parameters unchanged. The PAni salt first obtained was dedoped and the PAni-B (PAni in a base form, nonconductive) obtained was redoped with dodecylbenzenesulfonic acid (DBSA), when PAni-DBSA (PAni in a salt form, conductive) is obtained. The effects of synthesis conditions on the structural and morphological characteristics of PAni-B and PAni-DBSA are investigate by Raman Spectroscopy, XRD (X-ray diffractometer) and SEM (Scanning electron microscopy). Electrical conductivity was determined to redoped samples. Results were analyzed and we compare PAni forms to identifying the doping structure to PAni-DBSA by Raman spectroscopy. It was found too that reaction time can give some influence at conductivity. The XRD result showed differences in crystalline peaks of PAni-B and PAni-DBSA and this difference could be attributed mainly to the redoping process. Whereas the formation of crystals on a pilot scale may change because of effects caused by water flow, speed of polymerization could affect the formation of crystals too. The SEM pictures to PAni-B showed tiny coral reefs with globules structure and PAni-DBSA showed multilayer structure. References: 1 - Fratoddia I. et al. Sensors and Actuators B 220: 534–548 (2015); 2 - Roichman Y et al. Synthetic Metals 98

  20. A Modular Flow Design for the meta-Selective C-H Arylation of Anilines.

    Science.gov (United States)

    Gemoets, Hannes P L; Laudadio, Gabriele; Verstraete, Kirsten; Hessel, Volker; Noël, Timothy

    2017-06-12

    Described herein is an effective and practical modular flow design for the meta-selective C-H arylation of anilines. The design consists of four continuous-flow modules (i.e., diaryliodonium salt synthesis, meta-selective C-H arylation, inline copper extraction, and aniline deprotection) which can be operated either individually or consecutively to provide direct access to meta-arylated anilines. With a total residence time of 1 hour, the desired product could be obtained in high yield and excellent purity without the need for column chromatography, and the residual copper content meets the standards for parenterally administered pharmaceutical substances. © 2017 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.

  1. Aquatic fate of synfuel residuals: bioaccumulation of aniline and phenol by the freshwater phytoplankter Scenedesmus quadricauda

    International Nuclear Information System (INIS)

    Hardy, J.T.; Dauble, D.D.; Felice, L.J.

    1985-01-01

    Coal liquefaction compounds could, through accidental release, enter aquatic environments. Experiments were conducted to determine the kinetics, degree of bioconcentration and stability of two of these compounds at the first level of aquatic food web. The authors exposed the freshwater phytoplankter Scenedesmus quadricauda to sublethal concentrations of 14 C-labeled phenol and aniline. Both accumulation and elimination occurred within a few hours and followed hyperbolic kinetics. Results indicate that substantial quantities of accumulated compounds remain as the parent compound (22% for phenol and 52% for aniline) for up to 24 h and could be available to animals higher in the food web. Bioconcentration factors were 3.5 for phenol and 91 for aniline. 24 references, 2 figures, 1 table

  2. Effect of substitution on aniline in inducing growth of anionic micelles

    International Nuclear Information System (INIS)

    Garg, Gunjan; Kulshreshtha, S.K.; Hassan, P.A.; Aswal, V.K.

    2004-01-01

    Small-angle neutron scattering (SANS) measurements were carried out on sodium dodecyl sulfate (SDS) micelles in the presence of three different hydrophobic salts, i.e. aniline hydrochloride, o-toluidine hydrochloride and m-toluidine hydrochloride. All these salts induce a uniaxial growth of micelles to form prolate ellipsoidal structures. A progressive decrease in the surface charge of the micelles was observed with the addition of salts followed by a rapid growth of the micelles. The presence of a methyl substitution at the ortho position of aniline does not alter the growth behavior significantly. However, when the substitution is at meta position micellar growth is favored at lower salt concentration than that is observed for aniline. This can be explained in terms of the difference in the chemical environments of the substituents at the ortho and meta positions. (author)

  3. Gas-liquid chromatographic determination of aniline metabolites of substituted urea and carbamate herbicides in aqueous solution.

    Science.gov (United States)

    Hargesheimer, E E; Coutts, R T; Pasutto, F M

    1981-07-01

    A simple gas-liquid chromatographic (GLC) method has been developed which provides sensitivity and specificity for the analysis of complex mixtures of the commonly occurring herbicide metabolites aniline, 3-chloroaniline, 4-chloroaniline, 4-bromoaniline, and 3-chloro-4-methylaniline. All of these anilines react with acetic anhydride directly in basified aqueous solution. Further reaction of the acetylated anilines with trifluoroacetic anhydride gave diacyl derivatives which were readily resolved by gas chromatography. The structures of the N-acetylated and N-trifluoroacetylated derivatives of benzylamine (internal standard) and the anilines were confirmed by GLC-mass spectrometry. In distilled water the minimum detectable concentrations of aniline and the substituted anilines, using electron capture GLC, are 0.1 nmole/100 mL and 0.05 nmole/100 mL, respectively. The detection limit for the anilines is 1 nmole/100 mL distilled water, using GLC with flame ionization detection. The technique was applied to the determination of anilines added to urine samples obtained from the general population.

  4. Evaluation on joint toxicity of chlorinated anilines and cadmium to Photobacterium phosphoreum and QSAR analysis

    Energy Technology Data Exchange (ETDEWEB)

    Jin, Hao, E-mail: realking163@163.com [School of Life and Chemistry, Jiangsu Second Normal University, Nanjing, Jiangsu 210013 (China); Wang, Chao; Shi, Jiaqi [State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Nanjing, Jiangsu 210023 (China); Chen, Lei [School of Life and Chemistry, Jiangsu Second Normal University, Nanjing, Jiangsu 210013 (China)

    2014-08-30

    Highlights: • Cd has different effects on joint toxicity when in different concentrations. • The toxicity of most binary mixtures decreases when Cd concentration rises. • Different QSAR models are developed to predict the joint toxicity. • Descriptors in QSARs can help to elucidate the joint toxicity mechanism. • Van der Waals’ force or complexation may reduce the toxicity of mixtures. - Abstract: The individual IC{sub 50} (the concentrations causing a 50% inhibition of bioluminescence after 15 min exposure) of cadmium ion (Cd) and nine chlorinated anilines to Photobacterium phosphoreum (P. phosphoreum) were determined. In order to evaluate the combined effects of the nine chlorinated anilines and Cd, the toxicities of chlorinated anilines combined with different concentrations of Cd were determined, respectively. The results showed that the number of chlorinated anilines manifesting synergy with Cd decreased with the increasing Cd concentration, and the number manifesting antagonism decreased firstly and then increased. The joint toxicity of mixtures at low Cd concentration was weaker than that of most binary mixtures when combined with Cd at medium and high concentrations as indicated by TU{sub Total}. QSAR analysis showed that the single toxicity of chlorinated anilines was related to the energy of the lowest unoccupied molecular orbital (E{sub LUMO}). When combined with different concentrations of Cd, the toxicity was related to the energy difference (E{sub HOMO} − E{sub LUMO}) with different coefficients. Van der Waals’ force or the complexation between chlorinated anilines and Cd had an impact on the toxicity of combined systems, which could account for QSAR models with different physico-chemical descriptors.

  5. Synthesis of Poly aniline-Montmorillonite Nano composites Using H2O2 as the Oxidant

    International Nuclear Information System (INIS)

    Binitha, N.; Binitha, N.; Suraja, V.; Zahira Yaakob; Sugunan, S.

    2011-01-01

    Poly aniline montmorillonite nano composite was prepared using H 2 O 2 as the oxidant. The catalytic environment of montmorillonite favours polymerization. Intercalation and composite formation was proven from various techniques such as XRD, FTIR, DRS and thermal analysis. XRD patterns give the dimension of the intercalated PANI, from the shift of 2θ values, which is in the nano range. FTIR showed that PANI composite formation occurred without affecting the basic clay layer structure. Thus the successful development of an alternative cheap route for poly aniline-montmorillonite nano composite was well established. (author)

  6. Study of charge transfer complexes of menadione (vitamin K 3) with a series of anilines

    Science.gov (United States)

    Pal, Purnendu; Saha, Avijit; Mukherjee, Asok K.; Mukherjee, Dulal C.

    2004-01-01

    Menadione (vitamin K 3) has been shown to form charge transfer complexes with N, N-dimethyl aniline, N, N-dimethyl p-toluidine and N, N-dimethyl m-toluidine in CCl 4 medium. The CT transition energies are well correlated with the ionisation potentials of the anilines. The formation constants of the complexes have been determined at a number of temperatures from which the enthalpies and entropies of formation have been obtained. The formation constants exhibit a very good linear free energy relationship (Hammett) at all the temperatures studied.

  7. Resolved multisite OH-attack on aqueous aniline studied by pulse radiolysis

    International Nuclear Information System (INIS)

    Solar, S.; Solar, W.; Getoff, N.

    1986-01-01

    The individual formation and decay kinetics as well as the absorption characteristics of the simultaneously formed primary species by OH attack on aniline in aqueous solution (pH 8-9.6), saturated with N 2 O, have been determined by pulse radiolysis combined with a computer optimization procedure. Further the rate constant of e - sub(aq) with aniline was determined to (3.0+-0.1) x l0 7 dm 3 mol -1 cm -1 . Qualitative analysis of final products were also performed. (author)

  8. Influence of Biofield Energy Treatment on Isotopic Abundance Ratio in Aniline Derivatives

    OpenAIRE

    Nayak, Gopal; Trivedi, Mahendra Kumar; Trivedi, Dahryn; Branton, Alice

    2015-01-01

    The aim of this study was to evaluate the impact of biofield energy treatment on the isotopic abundance of 13C/12C or 2H/1H or 15N/14N ≡ (PM+1)/PM in aniline; and (PM+1)/PM and 81Br/79Br ≡ (PM+2)/PM in 4-bromoaniline using Gas Chromatography-Mass Spectrometry (GC-MS). Aniline and 4-bromoaniline samples were divided into two parts: control and treated. The control part remained as untreated, while the treated part was subjected to Mr. Trivedi’s biofield energy treatment. The treated samples we...

  9. Isotope exchange study of nickel xanthate in presence of aniline and isomeric toluidines

    International Nuclear Information System (INIS)

    Naidu, G.R.K.; Naidu, P.R.

    1982-01-01

    Isotopic exchange behaviour of nickel xanthate is studied in the presence of aniline and three isomeric toluidines at 18degC. The effect of base concentration is also studied on the exchange rate. The results show that the complex is labile in the kinetic sense in the presence of aniline meta and para toluidines. The rate of exchange increases with and para toluidines. The rate of exchange increases with increase in concentration of the base. The complex displays inert behaviour in the presence of o-toluidine and it is ascribed to dominant steric effect. (author)

  10. Influence of Biofield Energy Treatment on Isotopic Abundance Ratio in Aniline Derivatives

    OpenAIRE

    Trivedi , Mahendra Kumar; Branton , Alice; Trivedi , Dahryn; Nayak , Gopal; Saikia , Gunin; Jana , Snehasis

    2015-01-01

    International audience; The aim of this study was to evaluate the impact of biofield energy treatment on the isotopic abundance of 13C/12C or 2H/1H or 15N/14N ≡ (PM+1)/PM in aniline; and (PM+1)/PM and 81Br/79Br ≡ (PM+2)/PM in 4-bromoaniline using Gas Chromatography-Mass Spectrometry (GC-MS). Aniline and 4-bromoaniline samples were divided into two parts: control and treated. The control part remained as untreated, while the treated part was subjected to Mr. Trivedi’s biofield energy treatment...

  11. Iridium/Bipyridine-Catalyzed ortho-Selective C-H Borylation of Phenol and Aniline Derivatives.

    Science.gov (United States)

    Li, Hong-Liang; Kanai, Motomu; Kuninobu, Yoichiro

    2017-11-03

    An iridium-catalyzed ortho-selective C-H borylation of phenol and aniline derivatives has been successfully developed. Iridium/bipyridine-catalyzed C-H borylation generally occurred at the meta- and para-positions of aromatic substrates. Introduction of an electron-withdrawing substituent on the bipyridine-type ligand and a methylthiomethyl group on the hydroxy and amino groups of the phenol and aniline substrates, however, dramatically altered the regioselectivity, affording exclusively ortho-borylated products. The reaction proceeded in good to excellent yields with good functional group tolerance. C-H borylation was applied to the synthesis of a calcium receptor modulator.

  12. Reduction of graphene oxide by aniline with its concomitant oxidative polymerization.

    Science.gov (United States)

    Xu, Li Qun; Liu, Yi Liang; Neoh, Koon-Gee; Kang, En-Tang; Fu, Guo Dong

    2011-04-19

    Graphene oxide (GO) nanosheets are readily reduced by aniline above room temperature in an aqueous acid medium, with the aniline simultaneously undergoing oxidative polymerization to produce the reduced graphene oxide-polyaniline nanofiber (RGO-PANi) composites. The resulting RGO-PANi composites and RGO (after dissolution of PANi) were characterized by XPS, XRD analysis, TGA, UV-visible absorption spectroscopy, and TEM. It was also found that the RGO-PANi composites exhibit good specific capacitance during galvanostatic charging-discharging when used as capacitor electrodes. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  13. Influence of Biofield Energy Treatment on Isotopic Abundance Ratio in Aniline Derivatives

    OpenAIRE

    Mahendra, Trivedi; Alice, Branton; Dahryn, Trivedi; Gopal, Nayak

    2015-01-01

    The aim of this study was to evaluate the impact of biofield energy treatment on the isotopic abundance of 13C/12C or 2H/1H or 15N/14N ≡ (PM+1)/PM in aniline; and (PM+1)/PM and 81Br/79Br ≡ (PM+2)/PM in 4-bromoaniline using Gas Chromatography-Mass Spectrometry (GC-MS). Aniline and 4-bromoaniline samples were divided into two parts: control and treated. The control part remained as untreated, while the treated part was subjected to Mr. Trivedi's biofield energy treatment. The treated samples we...

  14. Dispersion of Pt Nanoparticle-Doped Reduced Graphene Oxide Using Aniline as a Stabilizer

    Directory of Open Access Journals (Sweden)

    Hyoung-Joon Jin

    2012-12-01

    Full Text Available In this study, a simple one-step method was developed to load small-sized Pt nanoparticles (3.1 ± 0.3 nm in large quantities (50 wt % on aniline-functionalized and reduced graphene oxide (r-fGO. In the process, an ethylene glycol solution and aniline-functionalized moiety play the roles of reducing agent and stabilizer for the Pt nanoparticles, respectively, without damaging the graphite structures of the r-fGO. The Pt nanoparticles loading on the surface of r-fGO with uniform dispersion have a great effect on the electrical conductivity.

  15. Synthesis and characterization of nanometal-ordered mesoporous carbon composites as heterogeneous catalysts for electrooxidation of aniline

    International Nuclear Information System (INIS)

    Duan, Xiaoyue; Chen, Yawen; Liu, Xinyue; Chang, Limin

    2017-01-01

    Highlights: •NM-OMC catalysts were prepared for electrochemical oxidation of aniline. •The oxidation of aniline was studied with NM-OMC catalysts suspended in solution. •The Cu-OMC exhibited the highest catalytic activity for aniline degradation. •The mineralization current efficiency was improved by 2 times with Cu-OMC catalyst. •An electrochemical mineralization pathway of aniline was proposed. -- Abstract: The Cu, Co and Ni nanometal embedded ordered mesoporous carbons (NM-OMCs) were fabricated by a soft-template method using phenol/formaldehyde as carbon source and triblock copolymer F127 as template agent. The morphology, structure, surface physicochemical properties and pore structure of the NM-OMCs were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and nitrogen adsorption-desorption isotherms. Their potential application to the electrocatalytic degradation of aniline was investigated using electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and ·OH radicals generation test. Furthermore, the electrochemical oxidation process of aniline was also investigated in the presence of the OMC-based catalyst particles suspended in a Na 2 SO 4 solution using a PbO 2 anode. Results revealed that the NM-OMCs inherited the ordered mesostructure of pristine OMC and the metal nanoparticles (Cu, Co or Ni) were embedded in the carbon framework. The Cu-OMC exhibited significantly higher catalytic activity than OMC and other NM-OMCs for the electrooxidation of aniline. In electrochemical oxidation process of aniline, nearly all of aniline could be degraded after 120 min of electrolysis with Cu-OMC particles as catalyst, while 89%, 92%, and 97% with OMC, Co-OMC and Ni-OMC catalysts, respectively, obviously higher than 76% of electrochemical oxidation without assistance of catalysts. After

  16. Photodissociation of aniline N–H bond in clusters of different nature

    Czech Academy of Sciences Publication Activity Database

    Poterya, Viktoriya; Nachtigallová, Dana; Lengyel, Jozef; Fárník, Michal

    2015-01-01

    Roč. 17, č. 38 (2015), s. 25004-25013 ISSN 1463-9076 R&D Projects: GA ČR GA14-14082S Institutional support: RVO:61388955 ; RVO:61388963 Keywords : NONADIABATIC COUPLING TERMS * MR-CI LEVEL * PHOTOEXCITED ANILIN E Subject RIV: CF - Physical ; Theoretical Chemistry Impact factor: 4.449, year: 2015

  17. Efficient treatment of aniline containing wastewater in bipolar membrane microbial electrolysis cell-Fenton system

    DEFF Research Database (Denmark)

    Li, Xiaohu; Jin, Xiangdan; Zhao, Nannan

    2017-01-01

    wastewater under an acidic condition maintained by the bipolar membrane. The aniline was effectively degraded following first-order kinetics at a rate constant of 0.0166 h−1 under an applied voltage of 0.5 V. Meanwhile, a total organic carbon (TOC) removal efficiency of 93.1 ± 1.2% was obtained, revealing...

  18. Polyaniline: Aniline oxidation with strong and weak oxidants under various acidity

    Czech Academy of Sciences Publication Activity Database

    Bláha, Michal; Trchová, Miroslava; Bober, Patrycja; Morávková, Zuzana; Prokeš, J.; Stejskal, Jaroslav

    2017-01-01

    Roč. 194, 15 June (2017), s. 206-218 ISSN 0254-0584 R&D Projects: GA ČR(CZ) GA16-02787S Institutional support: RVO:61389013 Keywords : aniline * oxidants * polyaniline Subject RIV: CD - Macromolecular Chemistry OBOR OECD: Polymer science Impact factor: 2.084, year: 2016

  19. Antipyrilquinoneimine dye formation by coupling aniline derivatives with 4-aminoantipyrine in the presence of ruthenium nanoparticles

    International Nuclear Information System (INIS)

    Kasthuri, J.; Santhanalakshmi, J.; Rajendiran, N.

    2008-01-01

    The coupling of 4-aminoantipyrine with aniline derivatives catalyzed by ruthenium nanoparticles has been studied by UV-Vis spectroscopy in aqueous medium. The rate constant for antipyrilquinoneimine dye formation depends on the nature of the aniline substituent and the p H, ionic strength and temperature of the reaction medium. The maximum rate constant of the dye formation reaction is observed at p H 3.6. Aniline derivatives with electron donating substituents show higher rate constant values than those with electron withdrawing substituents, with increasing rate constant values in the order: N,N-dimethyl aniline> a-toluidine> o-chloroaniline > m-chloroaniline. With pseudo first order kinetics, the total order is 1.0 + 1.0 + 1.0 = 3.0, which includes the orders with respect to amine, 4-aminoantipyrine and ruthenium nanoparticles. Studies on these effects help to complete the kinetic analysis as well as propose the reaction pathway. Furthermore, TEM measurement confirms that the nano scalar size of the ruthenium nanoparticles is 7 nm

  20. Detection of aniline oligomers on polyaniline-gold interface using resonance Raman scattering

    Czech Academy of Sciences Publication Activity Database

    Trchová, Miroslava; Morávková, Zuzana; Dybal, Jiří; Stejskal, Jaroslav

    2014-01-01

    Roč. 6, č. 2 (2014), s. 942-950 ISSN 1944-8244 R&D Projects: GA ČR GAP205/12/0911; GA ČR(CZ) GA13-00270S Institutional support: RVO:61389013 Keywords : polyaniline * aniline oligomers * Raman spectroscopy Subject RIV: CD - Macromolecular Chemistry Impact factor: 6.723, year: 2014

  1. Study and characterization of tobacco mosaic virus head-to-tail assembly assisted by aniline polymerization.

    Science.gov (United States)

    Niu, Zhongwei; Bruckman, Michael; Kotakadi, Venkata S; He, Jinbo; Emrick, Todd; Russell, Thomas P; Yang, Lin; Wang, Qian

    2006-07-28

    One-dimensional composite nanofibres with narrow dispersity, high aspect ratio and high processibility have been fabricated by head-to-tail self-assembly of rod-like tobacco mosaic virus assisted by aniline polymerization, which can promote many potential applications including electronics, optics, sensing and biomedical engineering.

  2. Poly(aniline-co-m-aminobenzoic acid) deposited on poly(vinyl ...

    Indian Academy of Sciences (India)

    Abstract. In this work, we have deposited poly(aniline-co-m-aminobenzoic acid) on poly(vinyl alcohol) (PVA) by in situ ... along the polyaniline (PANI) chain results in self dop- ing of PANI and ..... The value of electrical conductivity is found to be ...

  3. Industrial Process Design for the Production of Aniline by Direct Amination

    NARCIS (Netherlands)

    Driessen, Rick T.; Kamphuis, Peter; Mathijssen, Lydwien; Zhang, Ruo; van der Ham, Louis G.J.; van den Berg, Henk; Zeeuw, Arend Jan

    2017-01-01

    The objective is to design a plant from raw material to product for the production of aniline by direct amination of benzene. The process design is started on a conceptual level and ended on a basic engineering level as well as a techno-economical evaluation. The amination of benzene by

  4. Recommended vapor pressures for aniline, nitromethane, 2-aminoethanol, and 1-methyl-2-pyrrolidone

    Czech Academy of Sciences Publication Activity Database

    Růžička, K.; Fulem, Michal; Mahnel, T.; Červinka, C.

    2015-01-01

    Roč. 406, Nov (2015), 34-46 ISSN 0378-3812 Institutional support: RVO:68378271 Keywords : recommended vapor pressure equations * heat capacity * ideal - gas thermodynamic properties * aniline * nitromethane Subject RIV: BJ - Thermodynamics Impact factor: 1.846, year: 2015

  5. Kinetic investigation of the oxidation of N-alkyl anilines by ...

    Indian Academy of Sciences (India)

    Home; Journals; Journal of Chemical Sciences; Volume 112; Issue 6. Kinetic investigation of the oxidation of N-alkyl anilines by peroxomonophosphoric acid in anionic surfactant sodium lauryl sulphate. G P Panigrahi Jagannath Panda. Physical and Theoretical Volume 112 Issue 6 December 2000 pp 615-622 ...

  6. [2-(2,4-dimethylphenylthio)phenyl] aniline and its amide derivatives ...

    Indian Academy of Sciences (India)

    YOGESH PATIL

    2018-02-15

    Feb 15, 2018 ... These derivatives could be considered as a precursor structure for further design of antituberculosis agent. Keywords. [2-(2,4-dimethylphenylthio)phenyl] aniline; antituberculosis activity; cytotoxicity. 1. Introduction. Tuberculosis (TB) is a contagious disease caused by the. Mycobacterium tuberculosis (MTB).

  7. Uptake and fate of phenol, aniline and quinoline in terrestrial plants

    International Nuclear Information System (INIS)

    Cataldo, D.A.; Bean, R.M.; Fellows, R.J.

    1987-06-01

    The bioavailability and chemical fate of xenobiotics in terrestrial plants can influence the impact of fossil fuel development on the human food chain. To determine the relative behavior of organic residues representing a range of chemical classes, we compared the rates of root absorption, tissue distribution and chemical fate of phenol, aniline and quinoline in soybean plants. Root absorption rates for these compounds were 180, 13 and 30 μg/g (fresh weight) root/day, respectively. Following uptake, aniline was concentrated in the root, while phenol and quinoline were evenly distributed in roots and leaves. After accumulation, phenol was readily decomposed, and its carbon was respired. While aniline was susceptible to oxidative decomposition, it persisted in leaves and roots; 25% of the soluble activity represented aniline, and a significant fraction was bound or conjugated to cell constitutents. Quinoline persisted both in the parent form and as metabolic products. However, in leaves, additional compounds were found that were chemically similar to quinoline; these were not found in unexposed plants. A substantial fraction of the quinoline accumulated by leaves was emitted to the atmosphere by volatilization. 12 refs., 5 tabs., 2 figs

  8. Towards directional assembly of hierarchical structures: aniline oligomers as the model precursors

    Czech Academy of Sciences Publication Activity Database

    Zhao, Y.; Stejskal, Jaroslav; Wang, J.

    2013-01-01

    Roč. 5, č. 7 (2013), s. 2620-2626 ISSN 2040-3364 R&D Projects: GA ČR GAP205/12/0911 Institutional support: RVO:61389013 Keywords : aniline oligomers * hierarchical nanostructures * microflowers Subject RIV: CD - Macromolecular Chemistry Impact factor: 6.739, year: 2013

  9. Benzimidazoles and benzoxazoles via the nucleophilic addition of anilines to nitroalkanes.

    Science.gov (United States)

    Aksenov, Alexander V; Smirnov, Alexander N; Aksenov, Nicolai A; Bijieva, Asiyat S; Aksenova, Inna V; Rubin, Michael

    2015-04-14

    PPA-induced umpolung triggers efficient nucleophilic addition of unactivated anilines to nitroalkanes to produce N-hydroxyimidamides. The latter undergo sequential acid-promoted cyclocondensation with ortho-OH or ortho-NHR moieties to afford benzoxazoles and benzimidazoles, respectively.

  10. Synthesis and characterization of poly iodine anilines by plasma; Sintesis y caracterizacion de poliyodoanilinas por plasma

    Energy Technology Data Exchange (ETDEWEB)

    Enriquez P, M A

    2003-07-01

    The polymers and organic materials present a numberless quantity of applications. However, it has not been but until recent times that it has been found that some of these materials can possess semiconductor properties. This has generated a great interest for the investigation in the area of semiconductor polymers. The poly aniline (Pan) it is one of the main semiconductor polymers because their electric properties change depending on the doping and of the state of oxidation to the one the molecules are subjected. The synthesis of this material has been carried out by means of chemical oxidation or electrochemistry. In this work a study is presented on the formation of poly aniline polymers with halogens chemically united to the aniline ring, poly(m-iodine aniline) (m-PAnI) and poly(m-chloroaniline) (m-PAnCI) for plasma. The plasma is generated by means of discharges of splendor with an r f amplifier to 13.5 MHz to drops pressures (10{sup -2} mbar). The synthesized polymers were obtained in form of thin film in the walls of the reactor and in the substrate introduced in the one. The electric properties of the polymers were evaluated in function of the time of reaction. Also, the conductivity of the polymers was compared synthesized in this work with reported data of synthesized poly aniline and doped with iodine for plasma. The highest values in conductivity are obtained in the poly aniline where the halogens are chemically connected to the ring that if it is doped with iodine. The atomic proportion in the surface of the polymers was analyzed by dispersive energy spectroscopy with which is deduced that the halogens come off of the molecules of the monomers or of the polymer in formation and that the atoms of iodine get lost more easily than those of chlorine. Other techniques that were used to characterize to the poly aniline were scanning electron microscopy, infrared spectroscopy, thermal gravimetric analysis and X-ray diffraction. The results are presented in

  11. Evaluation of the Effects of S-Allyl-L-cysteine, S-Methyl-L-cysteine, trans-S-1-Propenyl-L-cysteine, and Their N-Acetylated and S-Oxidized Metabolites on Human CYP Activities.

    Science.gov (United States)

    Amano, Hirotaka; Kazamori, Daichi; Itoh, Kenji

    2016-01-01

    Three major organosulfur compounds of aged garlic extract, S-allyl-L-cysteine (SAC), S-methyl-L-cysteine (SMC), and trans-S-1-propenyl-L-cysteine (S1PC), were examined for their effects on the activities of five major isoforms of human CYP enzymes: CYP1A2, 2C9, 2C19, 2D6, and 3A4. The metabolite formation from probe substrates for the CYP isoforms was examined in human liver microsomes in the presence of organosulfur compounds at 0.01-1 mM by using liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis. Allicin, a major component of garlic, inhibited CYP1A2 and CYP3A4 activity by 21-45% at 0.03 mM. In contrast, a CYP2C9-catalyzed reaction was enhanced by up to 1.9 times in the presence of allicin at 0.003-0.3 mM. SAC, SMC, and S1PC had no effect on the activities of the five isoforms, except that S1PC inhibited CYP3A4-catalyzed midazolam 1'-hydroxylation by 31% at 1 mM. The N-acetylated metabolites of the three compounds inhibited the activities of several isoforms to a varying degree at 1 mM. N-Acetyl-S-allyl-L-cysteine and N-acetyl-S-methyl-L-cysteine inhibited the reactions catalyzed by CYP2D6 and CYP1A2, by 19 and 26%, respectively, whereas trans-N-acetyl-S-1-propenyl-L-cysteine showed weak to moderate inhibition (19-49%) of CYP1A2, 2C19, 2D6, and 3A4 activities. On the other hand, both the N-acetylated and S-oxidized metabolites of SAC, SMC, and S1PC had little effect on the reactions catalyzed by the five isoforms. These results indicated that SAC, SMC, and S1PC have little potential to cause drug-drug interaction due to CYP inhibition or activation in vivo, as judged by their minimal effects (IC 50 >1 mM) on the activities of five major isoforms of human CYP in vitro.

  12. A novel solid-state electrochemiluminescence quenching sensor for detection of aniline based on luminescent composite nanofibers

    International Nuclear Information System (INIS)

    Wang, Xiaoying; Yang, Yu; Gao, Huiwen

    2014-01-01

    A novel solid-state electrochemiluminescence (ECL) quenching sensor based on the luminescent composite nanofibers for detection of aniline has been developed. The gold nanoparticles (AuNPs) and Ruthenium (II) tris-(bipyridine) (Ru(bpy) 3 2+ ) doped nylon 6 (PA6) luminescent composite nanofibers (Ru–AuNPs–PA6) were successfully deposited to the bare glassy carbon (GC) electrode by a one-step electrospinning technique. The Ru–AuNPs–PA6 nanofibers maintained the photoelectric properties of the Ru(bpy) 3 2+ ions completely and exhibited excellent ECL behaviors. A high quenching effect on the ECL signal of the Ru–AuNPs–PA6/C 2 O 4 2− system was obtained with the presence of low concentration aniline compounds. The potential of analytical application was explored by use of the inhibited ECL. The quenching efficiencies of the five kinds of aniline compounds were compared by monitoring the aniline-dependent ECL intensity change. The magnitude of quenching depended linearly upon the concentration of aniline in the investigated concentration range of 10–10 µM. The detection limit for aniline is 5.0 nM, which is comparable or better than that in the reported assays. The solid-state ECL quenching sensor exhibited high sensitivity and good stability. This study may provide new insight into the design of advanced electrospun nanofibers-based ECL sensors for detection and analysis of a variety of active molecules. - Highlights: • The Ru–AuNPs–PA6 nanofibers were first prepared by one-step electrospinning technique. • The Ru–AuNPs–PA6 nanofibers exhibited excellent ECL behaviors on GC electrodes. • It is the first solid-state ECL sensor based on nanofibers for aniline detection. • The quenching efficiencies of the five kinds of aniline compounds were compared. • The strategy could be extended to develop various nanofibers-based ECL sensors

  13. Heterogeneity of activated carbons in adsorption of aniline from aqueous solutions

    Science.gov (United States)

    Podkościelny, P.; László, K.

    2007-08-01

    The heterogeneity of activated carbons (ACs) prepared from different precursors is investigated on the basis of adsorption isotherms of aniline from dilute aqueous solutions at various pH values. The APET carbon prepared from polyethyleneterephthalate (PET), as well as, commercial ACP carbon prepared from peat were used. Besides, to investigate the influence of carbon surface chemistry, the adsorption was studied on modified carbons based on ACP carbon. Its various oxygen surface groups were changed by both nitric acid and thermal treatments. The Dubinin-Astakhov (DA) equation and Langmuir-Freundlich (LF) one have been used to model the phenomenon of aniline adsorption from aqueous solutions on heterogeneous carbon surfaces. Adsorption-energy distribution (AED) functions have been calculated by using an algorithm based on a regularization method. Analysis of these functions for activated carbons studied provides important comparative information about their surface heterogeneity.

  14. Nonlinear optical measurements of conducting copolymers of aniline under CW laser excitation

    Science.gov (United States)

    Pramodini, S.; Poornesh, P.

    2015-08-01

    Synthesis and measurements of third-order optical nonlinearity and optical limiting of conducting copolymers of aniline are presented. Single beam z-scan technique was employed for the nonlinear optical studies. Continuous wave He-Ne laser operating at 633 nm was used as the source of excitation. Copolymer samples exhibited reverse saturable absorption (RSA) process. The nonlinear refraction studies depict that the copolymers exhibit self-defocusing property. The estimated values of βeff, n2 and χ(3) were found to be of the order of 10-2 cm/W, 10-5 esu and 10-7 esu respectively. Self-diffraction rings were observed due to refractive index change when exposed to the laser beam. A good optical limiting and clamping of power of ∼0.9 mW and ∼0.05 mW was observed. Therefore, copolymers of aniline emerge as a potential candidate for photonic device applications.

  15. Exploring Redox States, Doping and Ordering of Electroactive Star-Shaped Oligo(aniline)s.

    Science.gov (United States)

    Mills, Benjamin M; Fey, Natalie; Marszalek, Tomasz; Pisula, Wojciech; Rannou, Patrice; Faul, Charl F J

    2016-11-14

    We have prepared a simple star-shaped oligo(aniline) (TDPB) and characterised it in detail by MALDI-TOF MS, UV/Vis/NIR spectroscopy, time-dependent DFT, cyclic voltammetry and EPR spectroscopy. TDPB is part of an underdeveloped class of π-conjugated molecules with great potential for organic electronics, display and sensor applications. It is redox active and reacts with acids to form radical cations. Acid-doped TDPB shows behaviour similar to discotic liquid crystals, with X-ray scattering investigations revealing columnar self-assembled arrays. The combination of unpaired electrons and supramolecular stacking suggests that star-shaped oligo(aniline)s like TDPB have the potential to form conducting nanowires and organic magnetic materials. © 2016 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.

  16. Graphene/Poly(aniline-co-pyrrole) Nanocomposite: Potential Candidate for Supercapacitor and Microwave Absorbing Applications.

    Science.gov (United States)

    Sahoo, Sumanta; Bhattacharya, Pallab; Dhibar, Saptarshi; Hatui, Goutam; Das, Tanya; Das, Chapal Kumar

    2015-09-01

    A simple and cost-effective in-situ chemical route to prepare the nanocomposites based on graphene and Poly(aniline-co-pyrrole) [PPP] has been proposed. Introduction of graphene changes the morphology of copolymer from spherical to fiber like. Graphene/Poly(aniline-co-pyrrole) [GPPP] nanocomposite achieved highest specific capacitance of 351 F/g and energy density of 124.8 Wh/Kg at 10 mV/s scan rate. The composite also obtained moderate specific capacitance retention of 66% after 500 cycles, which establish its potentiality as supercapacitor electrode materials. The composite also exhibited high electrical conductivity and superior microwave absorbing properties (maximum reflection loss is -29.97 dB). The absorption range corresponding to ≥ 90% absorption (or -10 dB) is 2.72 GHz which is excellent for the microwave absorbing applications.

  17. Poly(ortho-phenylenediamine-co-aniline) based copolymer with improved capacitance

    Science.gov (United States)

    Olmedo-Martínez, Jorge L.; Farías-Mancilla, Bárbara I.; Vega-Rios, Alejandro; Zaragoza-Contreras, E. Armando

    2017-10-01

    A poly(ortho-phenylenediamine-co-aniline) copolymer is synthesized via the oxidative route, using a 1:1 M ratio of aniline to ortho-phenylenediamine (oPDA) and ammonium persulfate as the oxidizing agent. Infrared spectroscopy indicates that the copolymer contains the functional groups typically present in polyaniline and poly(ortho-phenylenediamine); whereas UV-vis-NIR spectroscopy shows that the copolymer adopts a phenazine-type structure. Cyclic voltammetry evidences the copolymer synthesis, as a redox peak at -65 mV, different from those exhibited by polyaniline (160 mV and 600 mV) or poly(o-phenylenediamine) (-240 mV) is observed. Finally, electrochemical impedance spectroscopy and the charge/discharge test provide support to propose the copolymer application in electrodes for supercapacitors.

  18. Ester Sensing with Poly (Aniline-co-m-aminobenzoic Acid Deposited on Poly (Vinyl Alcohol

    Directory of Open Access Journals (Sweden)

    S. ADHIKARI

    2011-02-01

    Full Text Available Poly (aniline-co-m-aminobenzoic acid was deposited on poly (vinyl alcohol film by in situ oxidative polymerization of the monomers aniline and m-aminobenzoic acid. Sensing experiments were performed on the composite film with the injection of various concentrations of hexenyl acetate and hexenyl butyrate at room temperature. The sensor responded rapidly and reversibly in the presence of hexenyl acetate and hexenyl butyrate vapors which was detected by resistance change of the composite film upon exposure to the vapor. Selectivity tests revealed that the sensor selectively responded to hexenyl butyrate compared to hexenyl acetate. The sensing response has been explained on the basis of FT-IR spectroscopic analysis of the polymer film before and after exposure to the ester vapor.

  19. Photocatalytic mineralisation of aniline derivatives in aquatic systems using semiconductor oxides.

    Science.gov (United States)

    Habibi, Mohammad Hossein; Khaledisardashti, Mohammad; Montazerozohori, Morteza

    2004-01-01

    Photocatalytic degradation of aqueous solution of aniline derivatives such as ortho-nitroaniline (ONA), meta-nitroaniline (MNA), para-nitroaniline (PNA), 4-bromoaniline (4-BrA) and 2-chloroaniline (2-ClA) were carried out over ZnO or TiO2 (anatase and rutile) in a photocatalytic reactor. The observed results revealed that the order of photocatalytic activity for degradation of selected compound was ZnO > TiO2 (rutile) > TiO2 (anatase) with the ratio of the rate constants to the surface area of 3.2 x 10(-3), 1.9 x 10(-3) and 1.0 x 10(-3) respectively. The effect of some physical and chemical parameters such as amount of photocatalyst, pH, time of irradiation and solvent were studied. Degradation kinetic was according to Longmuir behaviour. Spectrophotometric methods and TOC analysis supported that aniline derivatives almost completely mineralized.

  20. Nucleophilic catalysis of MeON-neoglycoside formation by aniline derivatives.

    Science.gov (United States)

    Loskot, Steven A; Zhang, Jianjun; Langenhan, Joseph M

    2013-12-06

    Neoglycosylations are increasingly being employed in the synthesis of natural products, drug candidates, glycopeptide mimics, oligosaccharide analogues, and other applications, but the efficiency of these reactions is usually limited by slow reaction times. Here, we show that aniline derivatives such as 2-amino-5-methoxybenzoic acid enhance the rate of acid-catalyzed neoglycosylation for a range of sugar substrates up to a factor of 32 relative to the uncatalyzed reaction.

  1. Study of RBC Efficiency in Aniline Removal by Increasing Contactor Specific Surface

    Directory of Open Access Journals (Sweden)

    Seyed Hossein Mousavi Aliani

    2011-01-01

    Full Text Available Aniline is a first type amino aromatic compound and has various applications in different pharmaceutical, synthetic dye, plastic, and petrochemical industries. It is poisonous and its discharge into the environment causes serious hazards that warrant it removal by an efficient treatment process.  In this study, the efficiency of rotating biological contactors in aniline removal was investigated using four 3-liter parallel systems (in two series. Two reactors in the first series had 27 disks. The second series had 14 discs with packings in each reactor with the same specific surfaces as compared to the first system.Aniline concentrations from 100 to 1200 mg/L and hydraulic loading rates from 1.57 to 6.28 L/m2.d were used throughout the study period in two treatments. The effect of disc rotation speed on system efficiency was also investigated. The results indicated that COD removal efficiency decreased with increasing hydraulic loading rate but increased with increasing disc speed from 5 to 15 rpm. The best removal efficiencies of 88 and 86 percent for RBCI and RBCII, respectively, were obtained for an aniline concentration of 400 mg/L, a hydraulic loading rate of 1.57 L/m2.d, and a disc speed of 15 rpm. Based on the results, although both systems yield almost equal efficiencies, the start-up period was shorter in RBCII with a clearer effluent due to the lower quantity of suspended microorganisms in the reactor than that in RBCI. Use of packing may decrease energy consumption for disc rotation due to the overall weight reduction of the system.

  2. Oceurrence of fungi degrading aniline and its derivatives in biocenoses of wastewater treatment systems

    Directory of Open Access Journals (Sweden)

    Tomasz Słomczyński

    2014-08-01

    Full Text Available It has been found that numerous yeast-like microorganisms from the genera Geotrichum, Trichmporon, Candida, Rhodotorula and Sporobolomyces occurring in wastewater treatment systems biocenoses arę able to utilize aniline, p-nitroaniline and acetanilide as a sole C-source. High active in this respect were strains belonging to the species of Geoirichum candidum, G. sericeum and Candida boidinii.

  3. Separation optimization of aniline and seven 4-substituted anilines in high-submicellar liquid chromatography using empirical retention modeling and Derringer's desirability function.

    Science.gov (United States)

    Hadjmohammadi, Mohammad Reza; S J Nazari, S Saman

    2013-08-01

    The separation optimization of aniline and seven 4-substituted derivatives in high-submicellar LC was performed using an interpretive optimization strategy and Derringer's desirability function. Description of the retention of solutes was carried out through several hyperbolic and logarithmic retention models using the retention data of five mobile phases of SDS (0.06-0.12 M) and methanol (50-70% v/v) at pH 3. Among the investigated models, a logarithmic retention model logk=c0+c1φ+c2[S]+c12φ[S]+d12(φ[S])0.5 showed the best prediction capability and was used to predict the solute retention factors. A grid search program was used to calculate the retention times of each solute, based on the best retention model, for all combinations of SDS and methanol concentrations in the factor space. Two different chromatographic goals, analysis time and retention differences between adjacent peaks, were evaluated simultaneously using Derringer's desirability function for each mobile phase conditions in the grid search. Optimal mobile phase composition for separation of eight anilines was found to be 0.119 M SDS and 53% v/v methanol. Under these conditions, full resolutions with a reasonable analysis time (22 min) were obtained. At the optimal condition, a good agreement was observed between predicted and experimental values of the retention times. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  4. Stepwise Nucleation of Aniline: Emergence of Spectroscopic Fingerprints of the Liquid Phase.

    Science.gov (United States)

    Leon, Iker; Usabiaga, Imanol; Arnaiz, Pedro Felipe; Lesarri, Alberto; Fernández, Jose Andres

    2018-06-11

    We deal here with the controlled nucleation of aniline from the isolated molecule until formation of a moderately large aggregate: aniline nonamer. The structure of the cluster at each step of the nucleation was unravelled combining mass-resolved IR spectroscopy and computational chemistry, demonstrating that aggregation is primarily guided by formation of extensive N-H···N hydrogen bond networks that give the aggregates a sort of branched backbone, in clear competition with multiple N-H/C-H···pi and pi···pi interactions. The result is the co-existence of close nucleation paths connecting relational aggregates. The delicate balance of molecular forces makes the aniline clusters a challenge for molecular orbital calculations and an ideal system to refine the present nucleation models. Noticeably, spectroscopic signatures characteristic of the condensed phase are apparent in the nanometer-size aggregates formed in this work. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  5. Volumetric properties of dichloromethane with aniline or nitrobenzene at different temperatures: A theoretical and experimental study

    International Nuclear Information System (INIS)

    Su Liyan; Wang Haijun

    2009-01-01

    The densities for binary mixtures of dichloromethane with aniline, or nitrobenzene, respectively, including those of pure liquids, were measured over the entire composition range at T = (288.15, 293.15, 298.15, and 303.15) K and atmospheric pressure using a vibrating-tube densimeter. From the experimental results, the excess molar volumes, V m E , partial molar volumes, V i -bar, the apparent molar volume, V φi , and the partial molar excess volumes at infinite dilution, (V i E -bar) ∞ , were calculated over whole composition range. Negative values of V m E for (dichloromethane + aniline) attributed to the formation of the charge transfer complex, while for (dichloromethane + nitrobenzene) system, the free volume effect played a dominant role. The extent of negative deviations in V m E values follows the order: nitrobenzene > aniline. The Prigogine-Flory-Patterson (PFP) theory and its applicability in predicting V m E at T = 298.15 K were tested. There is a good agreement in general between the experimental V m E values and those predicted by PFP theory

  6. Occupational contact dermatitis caused by aniline epoxy resins in the aircraft industry.

    Science.gov (United States)

    Pesonen, Maria; Suuronen, Katri; Jolanki, Riitta; Aalto-Korte, Kristiina; Kuuliala, Outi; Henriks-Eckerman, Maj-Len; Valtanen, Ilona; Alanko, Kristiina

    2015-08-01

    Tetraglycidyl-4,4'-methylenedianiline (TGMDA) is an aniline epoxy resin used in, for example, resin systems of pre-impregnated composite materials (prepregs) of the aircraft industry. Allergic contact dermatitis caused by TGMDA in prepregs has been described previously. To report on 9 patients with occupational allergic contact dermatitis caused by TGMDA in epoxy glues used in helicopter assembly. The patients were examined with patch testing at the Finnish Institute of Occupational Health in 2004-2009. The first patient was diagnosed by testing both components of two epoxy glues from the workplace, and was also tested with glue ingredients, including TGMDA. The following patients were tested with the glues and TGMDA. The resin parts of the glues were analysed for their epoxy compounds, including TGMDA. All of the patients had a patch test reaction to one or both of the resin parts of the TGMDA-containing glues. Eight of them had a strong allergic reaction to TGMDA, and one had a doubtful reaction to TGMDA. Two of the patients also had an allergic reaction to triglycidyl-p-aminophenol (TGPAP), another aniline epoxy resin, which was not present in the TGMDA-containing glues. In aircraft industry workers with suspected occupational dermatitis, aniline epoxy resins should be considered and patch tested as possible contact allergens. © 2015 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

  7. Effects of aniline concentrations on the electrical and mechanical properties of polyaniline polyvinyl alcohol blends

    Directory of Open Access Journals (Sweden)

    J. Bhadra

    2017-07-01

    Full Text Available In this work, we present an exclusive study on the effect of the feeding ratio of the monomer (aniline on the structural, thermal, mechanical and electrical properties of polyaniline (PANI polyvinyl alcohol (PVA blends. The films obtained from the blends are characterised to determine their surface properties and structural morphology (elemental analysis, SEM and FTIR, thermal properties (TGA and DSC and optical properties (UV–Vis spectroscopy. We study the effects of aniline on the mechanical and electrical properties of the composites by performing tensile, four probe and A.C. conductivity measurements, respectively. The SEM images reveal a heterogeneous distribution of conductive PANI particles in the continuous PVA matrix. During this experiment, the tensile strength of the blend films is maintained with an increase in the amount of aniline (up to 25 wt%, and this behaviour is attributed to intermolecular hydrogen bonding between PANI and PVA in the presence of the surfactant DBSA. The potential attraction of the experiment lies in the nature of the conductivity (of the blend films, which is found to increase from 10−8 to 10−3 S/cm with a percolation threshold of 0.78 wt%.

  8. Molecular architecture of electroactive and biodegradable copolymers composed of polylactide and carboxyl-capped aniline trimer.

    Science.gov (United States)

    Guo, Baolin; Finne-Wistrand, Anna; Albertsson, Ann-Christine

    2010-04-12

    Two-, four-, and six-armed branched copolymers with electroactive and biodegradable properties were synthesized by coupling reactions between poly(l-lactides) (PLLAs) with different architecture and carboxyl-capped aniline trimer (CCAT). The aniline oligomer CCAT was prepared from amino-capped aniline trimer and succinic anhydride. FT-IR, NMR, and SEC analyses confirmed the structure of the branched copolymers. UV-vis spectra and cyclic voltammetry of CCAT and copolymer solution showed good electroactive properties, similar to those of polyaniline. The water contact angle of the PLLAs was the highest, followed by the undoped copolymer and the doped copolymers. The values of doped four-armed copolymers were 54-63 degrees . Thermal properties of the polymers were studied by DSC and TGA. The copolymers had better thermal stability than the pure PLLAs, and the T(g) between 48-58 degrees C and T(m) between 146-177 degrees C of the copolymers were lower than those of the pure PLLA counterparts. This kind of electroactive and biodegradable copolymer has a great potential for applications in cardiovascular or neuronal tissue engineering.

  9. Detection of aniline oligomers on polyaniline-gold interface using resonance Raman scattering.

    Science.gov (United States)

    Trchová, Miroslava; Morávková, Zuzana; Dybal, Jiří; Stejskal, Jaroslav

    2014-01-22

    In situ deposited conducting polyaniline films prepared by the oxidation of aniline with ammonium peroxydisulfate in aqueous media of various acidities on gold and silicon supports were characterized by Raman spectroscopy. Enhanced Raman bands were found in the spectra of polyaniline films produced in the solutions of weak acids or in water on gold surface. These bands were weak for the films prepared in solutions of a strong acid on a gold support. The same bands are present in the Raman spectra of the reaction intermediates deposited during aniline oxidation in water or aqueous solutions of weak or strong acids on silicon removed from the reaction mixture at the beginning of the reaction. Such films are formed by aniline oligomers adsorbed on the surface. They were detected on the polyaniline-gold interface using resonance Raman scattering on the final films deposited on gold. The surface resonance Raman spectroscopy of the monolayer of oligomers found in the bulk polyaniline film makes this method advantageous in surface science, with many applications in electrochemistry, catalysis, and biophysical, polymer, or analytical chemistry.

  10. Effect of template in MCM-41 on the adsorption of aniline from aqueous solution.

    Science.gov (United States)

    Yang, Xinxin; Guan, Qingxin; Li, Wei

    2011-11-01

    The effect of the surfactant template cetyltrimethylammonium bromide (CTAB) in MCM-41 on the adsorption of aniline was investigated. Various MCM-41 samples were prepared by controlling template removal using an extraction method. The samples were then used as adsorbents for the removal of aniline from aqueous solution. The results showed that the MCM-41 samples with the template partially removed (denoted as C-MCM-41) exhibited better adsorption performance than MCM-41 with the template completely removed (denoted as MCM-41). The reason for this difference may be that the C-MCM-41 samples had stronger hydrophobic properties and selectivity for aniline because of the presence of the template. The porosity and cationic sites generated by the template play an important role in the adsorption process. The optimal adsorbent with moderate template was achieved by changing the ratio of extractant; it has the potential for promising applications in the field of water pollution control. Copyright © 2011 Elsevier Ltd. All rights reserved.

  11. [Influence of pH on Kinetics of Anilines Oxidation by Permanganate].

    Science.gov (United States)

    Wang, Hui; Sun, Bo; Guan, Xiao-hong

    2016-02-15

    To investigate the effect of pH on the oxidation of anilines by potassium permanganate, aniline and p-Chloroaniline were taken as the target contaminants, and the experiments were conducted under the condition with potassium permanganate in excess over a wide pH range. The reaction displayed remarkable autocatalysis, which was presumably ascribed to the formation of complexes by the in situ generated MnOx and the target contaminants on its surface, and thereby improved the oxidation rate of the target contaminants by permanganate. The reaction kinetics was fitted with the pseudo-first-order kinetics at different pH to obtain the pseudo-first-order reaction constants (k(obs)). The second-order rate constants calculated from permanganate concentration and k,b, increased with the increase of pH and reached the maximum near their respective pKa, after which they decreased gradually. This tendency is called parabola-like shaped pH-rate profile. The second-order rate constants between permanganate and anilines were well fitted by the proton transfer model proposed by us in previous work.

  12. Photodegradation of aniline by goethite doped with boron under ultraviolet and visible light irradiation

    International Nuclear Information System (INIS)

    Liu, Guanglong; Liao, Shuijiao; Zhu, Duanwei; Liu, Linghua; Cheng, Dongsheng; Zhou, Huaidong

    2011-01-01

    Highlights: → Goethite modified by boron was prepared by sol-gel method in presence of boron acid at the low temperature. → B-goethite has slight red shift in the band gap transition beside their stronger light absorption compared with pristine goethite. → The results showed that semiconductor photocatalytic reaction mechanism should exist in the process of aniline degradation with goethite and B-goethite as photocatalyst. -- Abstract: In the present study, goethite and goethite doped with boron (B-goethite) were employed to detect the presence or absence of semiconductor photocatalytic reaction mechanism in the reaction systems. B-goethite was prepared by sol-gel method in presence of boron acid in order to improve its photocatalystic efficiency under the ultraviolet and visible light irradiation. The optical properties of goethite and B-goethite were characterized by ultraviolet and visible absorption spectra and the result indicated that B-goethite has slight red shift in the band gap transition beside their stronger light absorption compared with pristine goethite. Degradation of aniline was investigated in presence of goethite and B-goethite in aqueous solution. It was found that the B-goethite photocatalyst exhibited enhanced ultraviolet and visible light photocatalytic activity in degradation of aniline compared with the pristine goethite. The photocatalytic degradation mechanism of B-goethite was discussed.

  13. Unexpected Biotransformation of the HDAC Inhibitor Vorinostat Yields Aniline-Containing Fungal Metabolites.

    Science.gov (United States)

    Adpressa, Donovon A; Stalheim, Kayla J; Proteau, Philip J; Loesgen, Sandra

    2017-07-21

    The diversity of genetically encoded small molecules produced by filamentous fungi remains largely unexplored, which makes these fungi an attractive source for the discovery of new compounds. However, accessing their full chemical repertoire under common laboratory culture conditions is a challenge. Epigenetic manipulation of gene expression has become a well-established tool for overcoming this obstacle. Here, we report that perturbation of the endophytic ascomycete Chalara sp. 6661, producer of the isofusidienol class of antibiotics, with the HDAC inhibitor vorinostat resulted in the production of four new modified xanthones. The structures of chalanilines A (1) and B (2) and adenosine-coupled xanthones A (3) and B (4) were determined by extensive NMR spectroscopic analyses, and the bioactivities of 1-4 were tested in antibiotic and cytotoxicity assays. Incorporation studies with deuterium-labeled vorinostat indicate that the aniline moiety in chalalanine A is derived from vorinostat itself. Our study shows that Chalara sp. is able to metabolize the HDAC inhibitor vorinostat to release aniline. This is a rare report of fungal biotransformation of the popular epigenetic modifier vorinostat into aniline-containing polyketides.

  14. An Electrochemical Study of Two Self-Dopable Water-Soluble Aniline Derivatives: Electrochemical Deposition of Copolymers

    Directory of Open Access Journals (Sweden)

    Loredana Vacareanu

    2012-01-01

    Full Text Available An electrochemical study of two water-soluble aniline derivatives, N-(3-sulfopropyl aniline (AnPS and N-(3-sulfopropyl p-aminodiphenylamine (DAnPS, in aqueous acidic electrolytic solutions containing different kinds of doping anions (Cl −, SO4 2−, and ClO4 − was carried out. At sufficiently high anodic potential, the sulfonated aniline derivatives undergo oxidation processes yielding cation-radical and dimer intermediates, but no polymer deposition was observed on the working electrode surface. Experimental results showed that both aniline derivatives are electroactive compounds exhibiting redox behaviour in the range of potential of −0.2 V–1.6 V. Due to the self-doping effect induced by sulfonic groups, AnPS and DAnPS compounds have good electroactivity even in neat water solution. By adding a small amount of aniline into electrolytic system, thin layers of copolymers were deposited on the working electrode surface. The copolymer layers formed on the electrodes show a highly orientational and positional order, confirmed by AFM and XRD spectroscopic techniques. During the anodic oxidation processes some distinct colour changes were observed.

  15. Activity of Aniline Methylation over Fe-Cu-Cr Ternary Spinel Systems

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    Reni George

    2014-03-01

    Full Text Available A series of spinels having thegeneral formula CuCr2-xFexO4 with x=0.25,0.75, 1.25, 1.75 were prepared by co-precipitation method. The catalysts werecharacterized by various physico-chemical methods like XRD, BET, UV-DRS, SEM,EDX, TPD etc. The reaction of aniline with methanol was studied in a fixed-bedreactor system as a potential source for the production of various methylanilines. It was observed that systems possessing low ‘x’ values are highlyselective and active for N-monoalkylation of aniline leading toN-methylaniline. Reaction parameters were properly varied to optimize thereaction conditions for obtaining N-methylaniline selectively and in betteryield. Among the systems CuCr1.75Fe0.25O4 isremarkable due to its very high activity and excellent stability. Under theoptimized conditions N-methylaniline selectivity exceeded 91%. CuCr1.25Fe0.75O4gives better conversion than CuCr1.75Fe0.25O4in CuCr2-xFexO4 series. The Lewis acid sitesof the catalysts are mainly responsible for the good catalytic performance. © 2014 BCREC UNDIP. All rights reservedSubmitted: 18th July 2013; Revised: 5th November 2013; Accepted: 1st December 2013[How to Cite: George, R., George, K., Sugunan, S. (2014. Activity of Aniline Methylation over Fe-Cu-Cr Ternary Spinel Systems. Bulletin of Chemical Reaction Engineering & Catalysis, 9 (1: 39-44. (doi:10.9767/bcrec.9.1.5169.39-44][Permalink/DOI: http://dx.doi.org/10.9767/bcrec.9.1.5169.39-44] 

  16. Time resolved resonance Raman spectra of anilino radical and aniline radical cation

    International Nuclear Information System (INIS)

    Tripathi, G.N.R.; Schuler, R.H.

    1987-01-01

    We report, in this paper, submicrosecond time resolved resonance Raman spectra of anilino radical and its radical cation as observed in pulse radiolytic studies of the oxidation of aniline in aqueous solution. By excitation in resonance with the broad and weak electronic transition of anilino radical at 400 nm (ε--1250 M -1 cm -1 ) we have observed, for the first time, the vibrational features of this radical. The Wilson ν 8 /sub a/ ring stretching mode at 1560 cm -1 is most strongly resonance enhanced. The ν 7 /sub a/ CN stretching band at 1505 cm -1 , which is shifted to higher frequency by 231 cm -1 with respect to aniline, is also prominent. The frequency of this latter mode indicates that the CN bond in the radical has considerable double bond character. The Raman spectrum of aniline radical cation, excited in resonance with the --425 nm electronic absorption (ε--4000 M -1 cm -1 ), shows features which are similar to phenoxyl radical. Most of the observed frequencies of this radical in solution are in good agreement with vibrational energies determined by recent laser photoelectron spectroscopic studies in the vapor phase. The bands most strongly enhanced in the resonance Raman spectrum are, however, weak in the photoelectron spectrum. While the vibrational frequencies observed for anilino radical and its isoelectronic cation are quite similar, the resonance enhancement patterns are very different. In particular the ν 14 b 2 mode of anilino radical observed at 1324 cm -1 is highly resonance enhanced because of strong vibronic coupling between the 400 nm 2 A 2 -- 2 B 1 and the higher 2 B 1 -- 2 B 1 electronic transitions

  17. p-Nitrophenol, phenol and aniline sorption by organo-clays

    International Nuclear Information System (INIS)

    Ko, C.H.; Fan Chihhao; Chiang, P.N.; Wang, M.K.; Lin, K.C.

    2007-01-01

    The aims of this study were to make use of organo-clays (i.e., Cloisite-10A, Cloisite-15A, Cloisite-30B and Cloisite-93A), to remove p-nitrophenol, phenol and aniline of organic pollutants. The organo-clays were characterized by X-ray diffraction (XRD). Sorption isotherm, kinetic and pH effect of p-nitrophenol, phenol and aniline sorbed by four organo-clays were evaluated. The d-spacings (0 0 1) of the XRD peak of Cloisite-10A, Cloisite-15A, Cloisite-30B and Cloisite-93A are 1.98, 2.76, 1.93 and 2.64 nm, respectively. The d(0 0 1)-spacings of XRD indicated that these p-nitropheno, phenol and aniline could penetrate into the interlayer of clays and expand the d(0 0 1)-spacings. The linear sorption isotherm of constant partition was employed to describe the sorption isotherms of phenols sorbed by organo-clays through hydrophobic-hydrophobic chemical reactions. The parabolic diffusion and power-function of kinetic models were employed to describe properly the kinetic experiments. The rate limiting step of the p-nitrophenol sorption reactions on organo-clays were diffusion-controlled processes (i.e., 15A, 30B, 93A) and chemical-controlled process for 10A organo-clays. The pre-exponential factor of the p-nitrophenol sorbed by four organo-clays showed the trend as follows: 10A > 30B > 93A > 15A. The efficiency of these organo-clays in removing phenol compounds in water treatments merit further study

  18. Isotope exchange behaviour of nickel xanthate in presence of substituted anilines and isomeric picolines

    International Nuclear Information System (INIS)

    Naidu, G.R.K.; Naidu, P.R.

    1981-01-01

    The isotope exchange behaviour of nickel xanthate was investigated in the presence of aniline, N-methylaniline, N,N-dimethylaniline and three picoline isomers at 25 deg C. The results showed that the labelled free nickel(II) replaces inactive nickel(II) in the complex. Hence the complex is labile in the presence of all bases except β- and γ-picolines. The observed lability has been attributed to an adduct formation between the complex and the bases. The inert behaviour observed in the presence of β- and ν-picolines has been ascribed to the steric effect of the methyl groups on the adduct formation. (author)

  19. Temperature dependent electrical properties of polyaniline film grown on paper through aniline vapor polymerization

    International Nuclear Information System (INIS)

    Deb, K.; Bera, A.; Saha, B.; Bhowmik, K. L.; Chattopadhyay, K. K.

    2016-01-01

    Polyaniline thin film has been prepared on paper by aniline vapor deposition technique. Ferric chloride has been used as polymerizing agent in this approach. The prepared films were studied through electrical resistivity and optical properties measurements. The electrical resistivity of the polyaniline film shows significant temperature dependence. The resistance sharply falls with the increase in temperature. The optical absorbance measurements shows characteristics absorbance peak indicating the formation of conducting emeraldine salt form of polyaniline. The optical energy band gap of the film was calculated from the transmittance spectra. The optical energy band gap and electrical conductivity of the polyaniline film is well suited for their applications in electronic devices.

  20. Electrospun aniline-tetramer-co-polycaprolactone fibres for conductive, biodegradable scaffolds.

    Science.gov (United States)

    Guex, A G; Spicer, C D; Armgarth, A; Gelmi, A; Humphrey, E J; Terracciano, C M; Harding, S; Stevens, M M

    2017-09-01

    Conjugated polymers have been proposed as promising materials for scaffolds in tissue engineering applications. The restricted processability and biodegradability of conjugated polymers limit their use for biomedical applications however. Here we synthesised a block- co -polymer of aniline tetramer and PCL (AT-PCL), and processed it into fibrous non-woven scaffolds by electrospinning. We showed that fibronectin (Fn) adhesion was dependant on the AT-PCL oxidative state, with a reduced Fn unfolding length on doped membranes. Furthermore, we demonstrated the cytocompatibility and potential of these membranes to support the growth and osteogenic differentiation of MC3T3-E1 over 21 days.

  1. Temperature dependent electrical properties of polyaniline film grown on paper through aniline vapor polymerization

    Energy Technology Data Exchange (ETDEWEB)

    Deb, K.; Bera, A.; Saha, B., E-mail: biswajit.physics@gmail.com [Department of Physics, National Institute of Technology Agartala, Jirania, West Tripura 799046 (India); Bhowmik, K. L. [Department of Physics, National Institute of Technology Agartala, Jirania, West Tripura 799046 (India); Department of Chemistry, Bir Bikram Memorial College, Agartala, West Tripura 799004 (India); Chattopadhyay, K. K. [Department of Physics, Jadavpur University, Kolkata 700 032 (India)

    2016-05-23

    Polyaniline thin film has been prepared on paper by aniline vapor deposition technique. Ferric chloride has been used as polymerizing agent in this approach. The prepared films were studied through electrical resistivity and optical properties measurements. The electrical resistivity of the polyaniline film shows significant temperature dependence. The resistance sharply falls with the increase in temperature. The optical absorbance measurements shows characteristics absorbance peak indicating the formation of conducting emeraldine salt form of polyaniline. The optical energy band gap of the film was calculated from the transmittance spectra. The optical energy band gap and electrical conductivity of the polyaniline film is well suited for their applications in electronic devices.

  2. Temperature dependent electrical properties of polyaniline film grown on paper through aniline vapor polymerization

    Science.gov (United States)

    Deb, K.; Bhowmik, K. L.; Bera, A.; Chattopadhyay, K. K.; Saha, B.

    2016-05-01

    Polyaniline thin film has been prepared on paper by aniline vapor deposition technique. Ferric chloride has been used as polymerizing agent in this approach. The prepared films were studied through electrical resistivity and optical properties measurements. The electrical resistivity of the polyaniline film shows significant temperature dependence. The resistance sharply falls with the increase in temperature. The optical absorbance measurements shows characteristics absorbance peak indicating the formation of conducting emeraldine salt form of polyaniline. The optical energy band gap of the film was calculated from the transmittance spectra. The optical energy band gap and electrical conductivity of the polyaniline film is well suited for their applications in electronic devices.

  3. Mild Palladium Catalyzed ortho C-H Bond Functionalizations of Aniline Derivatives.

    Science.gov (United States)

    Tischler, Ms Orsolya; Tóth, Mr Balázs; Novák, Zoltán

    2017-02-01

    This account collects the developments and transformations which avoid the utilization of harsh reaction conditions in the field of palladium catalyzed, ortho-directed C-H activation of aniline derivatives from the first attempts to up-to-date results, including the results of our research laboratory. The discussed functionalizations performed under mild conditions include acylation, olefination, arylation, alkylation, alkoxylation reactions. Beside the optimization studies and the synthetic applications mechanistic investigations are also presented. © 2017 The Chemical Society of Japan & Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

  4. Combining Eosin Y with Selectfluor: A Regioselective Brominating System for Para-Bromination of Aniline Derivatives.

    Science.gov (United States)

    Huang, Binbin; Zhao, Yating; Yang, Chao; Gao, Yuan; Xia, Wujiong

    2017-07-21

    A mild, metal-free, and absolutely para-selective bromination of aniline derivatives has been developed in excellent yields, wherein the organic dye Eosin Y is employed as the bromine source in company with Selectfluor. Neither air nor moisture sensitive, this facile reaction proceeds smoothly at room temperature and completes within a short time. Mechanistic studies indicate a radical pathway; therefore, the existence of an in situ generated brominating reagent, "Selectbrom", is postulated, which may reasonably account for the unique regioselectivity for the para-bromination of N-acyl- as well as N-sulfonylanilines.

  5. Synthesis of (benzimidazol-2-yl)aniline derivatives as glycogen phosphorylase inhibitors.

    Science.gov (United States)

    Galal, Shadia A; Khattab, Muhammad; Andreadaki, Fotini; Chrysina, Evangelia D; Praly, Jean-Pierre; Ragab, Fatma A F; El Diwani, Hoda I

    2016-11-01

    A series of (benzimidazol-2-yl)-aniline (1) derivatives has been synthesized and evaluated as glycogen phosphorylase (GP) inhibitors. Kinetics studies revealed that compounds displaying a lateral heterocyclic residue with several heteroatoms (series 3 and 5) exhibited modest inhibitory properties with IC 50 values in the 400-600μM range. Arylsulfonyl derivatives 7 (Ar: phenyl) and 9 (Ar: o-nitrophenyl) of 1 exhibited the highest activity (series 2) among the studied compounds (IC 50 324μM and 357μM, respectively) with stronger effect than the p-tolyl analogue 8. Copyright © 2016 Elsevier Ltd. All rights reserved.

  6. Influence of both ion bombardment and chemical treatment processes on the electrical conductivity of PVC/poly aniline composites

    International Nuclear Information System (INIS)

    Gad, E.A.M.; Ashour, A.H.; Abdel-Hamid, H.M.; Sayed, W.M.

    1999-01-01

    In this article the changes in the electrical conductivity of PVC/poly aniline composites, as temperature consecutively increases, have been measured. The measurement were taken with correspondence to a control series of the composites under two processes:A. Composite samples bombarded with Ar + ions with fluence 2.44 x 10 13 beam ions /cm 2 ., sec 4 of 4 ke V beam energy where argon atoms can induce defects in the surface layer take place. Composite samples treated chemically with concentrated H 2 SO 4 as dopant which reacts with nitrogen atom in aniline. The measurements were also, done with the composites as the ratio of poly(aniline) stepped upward

  7. Combustion synthesis by reaction and characterization of nano ferrites: study of fuel aniline, citric and its mixture

    International Nuclear Information System (INIS)

    Silva, M.C. da; Coutinho, J.P.; Costa, A.C.F.M.; Kiminami, R.H.G.A.; Freitas, N.L. de

    2012-01-01

    The present study aims to evaluate the influence of aniline and citric acid used alone and combined in a ratio of 50% each in the characterization of NiZn ferrite synthesized by combustion reaction method in a muffle furnace. Measurements were made of temperature and reaction time. The nano-powders were characterized by XRD, EDX, textural analysis and SEM. The highest temperature was achieved by the reaction using the mixture of fuel and increased reaction time using citric acid. The nano ferrites using different fuels, and the mixture changed phases, the crystallite size and decreased surface area of the samples with aniline, citric acid and a mixture of both, respectively. The powder morphology ranged from presenting the formation of irregular blocks for the use of citric agglomerated in the form of skeins with aniline and a mixture to agglomerate larger particles. (author)

  8. Immobilisation of enzymes on poly(aniline)-poly(anion) composite films. Preparation of bioanodes for biofuel cell applications.

    Science.gov (United States)

    Simon, Evelyne; Halliwell, Catherine M; Toh, Chee Seng; Cass, Anthony E G; Bartlett, Philip N

    2002-01-01

    Immobilisation of enzymes is important for applications such as biosensors or biofuel cells. A poly(histidine) tag had been introduced on the C terminus of a lactate dehydrogenase enzyme. This mutant enzyme was then immobilised onto poly(aniline) (PANi)-poly(anion) composite films, PANi-poly(vinylsulfonate) (PVS) or PANi-poly(acrylate) (PAA). The NADH produced by the immobilised enzyme in the presence of beta-nicotinamide adenine dinucleotide (NAD(+)) and lactate is oxidised at the poly(aniline)-coated electrode at 0.05 to 0.1 V vs. saturated calomel electrode (SCE) at 35 degrees C.

  9. Polyvinylpyrrolidone/ Poly aniline Composite Based 36 degree YX LiTaO3 Surface Acoustic Wave H2 Gas Sensor

    International Nuclear Information System (INIS)

    Amir Sidek; Rashidah Arsat; Xiuli, He; Kalantar-zadeh, K.; Wlodarski, W.

    2013-01-01

    Poly-vinyl-pyrrolidone (PVP)/ poly aniline based surface acoustic wave (SAW) sensors were fabricated and characterized and their performances towards hydrogen gas were investigated. The PVP/ poly aniline fibers composite were prepared by electro spinning of the composite aqueous solution deposited directly onto the active area of SAW transducers. Via scanning electron microscopy (SEM), the morphology of the deposited nano structure material was observed. From the dynamic response, frequency shifts of 6.243 kHz (1% H 2 ) and 8.051 kHz (1% H 2 ) were recorded for the sensors deposited with PVP/ ES and PVP/ EB, respectively. (author)

  10. Preparation and characterization of nanocomposite between poly(aniline-co-m-chloroaniline)–copper sulfide nanoparticles

    Energy Technology Data Exchange (ETDEWEB)

    Abbas, Saeed J.; Rani, Mamta; Tripathi, S.K., E-mail: surya@pu.ac.in

    2014-06-15

    One dimensional nanostructures of poly(aniline-co-m-chloroaniline) nanocomposite (NC) with CuS nanoparticles (NPs) are prepared by template free method. CuS NPs are prepared by chemical method by using trisodium nitilotriacetate acid as a complexing agent. The materials are characterized by X-ray diffraction (XRD), energy-dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Ultraviolet spectroscopy (UV-Vis), photoluminescence (PL) spectroscopy and thermogravimetric analysis (TGA). The hexagonal structure of CuS NPs is confirmed from XRD results with lattice parameters, a=3.78 Å and c=16.288 Å. The diameter of CuS NPs is found to be 16 nm from TEM measurements. Different shapes such as NPs, nanorods and nanotubes structures are observed for poly(aniline-co-m-chloroaniline) whereas its NC with CuS NPs have nanorod and nanotube shapes. Significant shift in the absorption edge of CuS NC is observed in comparison with copolymer and CuS NPs. Also the thermal stability of CuS NC is improved as compared with a copolymer and CuS NPs.

  11. Photoactivated bioconjugation between ortho-azidophenols and anilines: a facile approach to biomolecular photopatterning.

    Science.gov (United States)

    El Muslemany, Kareem M; Twite, Amy A; ElSohly, Adel M; Obermeyer, Allie C; Mathies, Richard A; Francis, Matthew B

    2014-09-10

    Methods for the surface patterning of small molecules and biomolecules can yield useful platforms for drug screening, synthetic biology applications, diagnostics, and the immobilization of live cells. However, new techniques are needed to achieve the ease, feature sizes, reliability, and patterning speed necessary for widespread adoption. Herein, we report an easily accessible and operationally simple photoinitiated reaction that can achieve patterned bioconjugation in a highly chemoselective manner. The reaction involves the photolysis of 2-azidophenols to generate iminoquinone intermediates that couple rapidly to aniline groups. We demonstrate the broad functional group compatibility of this reaction for the modification of proteins, polymers, oligonucleotides, peptides, and small molecules. As a specific application, the reaction was adapted for the photolithographic patterning of azidophenol DNA on aniline glass substrates. The presence of the DNA was confirmed by the ability of the surface to capture living cells bearing the sequence complement on their cell walls or cytoplasmic membranes. Compared to other light-based DNA patterning methods, this reaction offers higher speed and does not require the use of a photoresist or other blocking material.

  12. Kinetic study of adsorption and degradation of aniline, benzoic acid, phenol, and diuron in soil suspensions

    International Nuclear Information System (INIS)

    Dao, T.H.; Lavy, T.L.

    1987-01-01

    Laboratory studies were conducted to investigate the effects of low temperature and accelerated soil-solution contact on soil adsorption of labile organic chemicals. The authors measured the kinetics of adsorption and degradation of 14 C-aniline, 14 C-benzoic acid, 14 C-phenol, and 14 C-diuron in the solution phase at 3 and 22 0 C. In the initial stages of reactions, the adsorption of all four chemicals was instantaneous at both temperatures under accelerated soil and solution mixing. A steady state was observed after the onset of equilibrium for the adsorption reaction for all compounds within 10 to 30 min. Its length varied according to the expected order of susceptibility to microbial degradation, i.e., diuron > aniline > phenol ≥ benzoate. It was apparent that the steady-state period without or in combination with low temperature could be advantageously used to obtain adsorption measurements in microbially active systems. A mechanistic sorption-catalyzed degradation model was evaluated to uncouple mathematically these processes. The model described satisfactorily the disappearance of labile chemicals in soil suspensions. Numerical analysis allowed the concurrent determination of adsorption, desorption, and biodegradation rate coefficients

  13. Nanoparticle formation in a low pressure argon/aniline RF plasma

    Science.gov (United States)

    Pattyn, C.; Kovacevic, E.; Hussain, S.; Dias, A.; Lecas, T.; Berndt, J.

    2018-01-01

    The formation of nanoparticles in low temperature plasmas is of high importance for different fields: from astrophysics to microelectronics. The plasma based synthesis of nanoparticles is a complex multi-scale process that involves a great variety of different species and comprises timescales ranging from milliseconds to several minutes. This contribution focuses on the synthesis of nanoparticles in a low temperature, low pressure capacitively coupled plasma containing mixtures of argon and aniline. Aniline is commonly used for the production of polyaniline, a material that belongs to the family of conductive polymers, which has attracted increasing interest in the last few years due to the large number of potential applications. The nanoparticles which are formed in the plasma volume and levitate there due to the collection of negative charges are investigated in this contribution by means of in-situ FTIR spectroscopy. In addition, the plasma is analyzed by means of plasma (ion) mass spectroscopy. The experiments reveal the possibility to synthesize nanoparticles both in continuous wave and in pulsed discharges. The formation of particles in the plasma volume can be suppressed by pulsing the plasma in a specific frequency range. The in-situ FTIR analysis also reveals the influence of the argon plasma on the characteristics of the nanoparticles.

  14. Computational study of the rate constants and free energies of intramolecular radical addition to substituted anilines

    Directory of Open Access Journals (Sweden)

    Andreas Gansäuer

    2013-08-01

    Full Text Available The intramolecular radical addition to aniline derivatives was investigated by DFT calculations. The computational methods were benchmarked by comparing the calculated values of the rate constant for the 5-exo cyclization of the hexenyl radical with the experimental values. The dispersion-corrected PW6B95-D3 functional provided very good results with deviations for the free activation barrier compared to the experimental values of only about 0.5 kcal mol−1 and was therefore employed in further calculations. Corrections for intramolecular London dispersion and solvation effects in the quantum chemical treatment are essential to obtain consistent and accurate theoretical data. For the investigated radical addition reaction it turned out that the polarity of the molecules is important and that a combination of electrophilic radicals with preferably nucleophilic arenes results in the highest rate constants. This is opposite to the Minisci reaction where the radical acts as nucleophile and the arene as electrophile. The substitution at the N-atom of the aniline is crucial. Methyl substitution leads to slower addition than phenyl substitution. Carbamates as substituents are suitable only when the radical center is not too electrophilic. No correlations between free reaction barriers and energies (ΔG‡ and ΔGR are found. Addition reactions leading to indanes or dihydrobenzofurans are too slow to be useful synthetically.

  15. The effects of Urtica dioica L. leaf extract on aniline 4-hydroxylase in mice.

    Science.gov (United States)

    Ozen, Tevfik; Korkmaz, Halil

    2009-01-01

    The effects of hydroalcoholic (80% ethanol-20% water) extract of Urtica dioica L. on microsomal aniline 4-hydroxylase (A4H) were investigated in the liver of Swiss albino mice (8- 10-weeks-old) treated with two doses (50 and 100 mg/kg body weight, given orally for 14 days ). The activities of A4H showed a significant increase in the liver at both dose levels of extract treatment. The hydroalcoholic extract of Urtica dioica induced the activities of A4H that had been increased by treatment of metal ions (Mg2+ and Ca2+) and the mixture of cofactors (NADH and NADPH). At saturated concentration of cofactor, microsomal A4H exhibited significantly even higher activities in the presence of the mixture of cofactors than NADPH and NADH. Mg2+ and Ca2+ ions acted as stimulants in vitro. The present results suggest that the hydroalcoholic extract of Urtica dioica may have modalatory effect on aniline hydroxylase at least in part and enhance the activity of A4H adding metals ions and cofactors.

  16. Binary liquid-liquid equilibria of aniline-paraffin and furfural-paraffin systems

    Energy Technology Data Exchange (ETDEWEB)

    Sen, S.C.; Maity, S.; Ganguli, K.; Ray, P. (Calcutta Univ., (India))

    1991-12-01

    Liquid-liquid-equilibria (L-L-E) of hydrocarbon containing systems are of considerable commercial importance to refineries. But prediction of L-L-E of such systems is extremely difficult owing to the complex nature of the petroleum fluids. For treating such complex mixtures, a continuous component method is appropriate and for representing such liquids, a group contribution model like the UNIFAC is extremely convenient. It is, however, necessary to determine the appropriate group interaction parameters, and also to test the applicability of the UNIFAC method to these cases. Binary liquid-liquid-equilibria data for several aniline-paraffin and furfural-paraffin systems have been taken. These data along with data for other aniline-hydrocarbon and furfural-hydrocarbon systems from literature have been correlated using the UNIFAC model. The UNIFAC group interaction parameters have been found to have a linear temperature dependence. The CH{sub 2} groups in cyclo and non-cyclo paraffins require different interaction parameters. It was also found that a scaling of the combinatorial term is necessary for higher molecular weight hydrocarbons. 13 refs., 12 figs., 5 tabs.

  17. Thermochemistry of adducts of some bivalent transition metal bromides with aniline

    International Nuclear Information System (INIS)

    Dunstan, Pedro Oliver

    2006-01-01

    The compounds [MBr 2 (an) 2 ] (where M is Mn(II), Fe(II), Co(II), Ni(II), Cu(II) or Zn(II); an=aniline) were synthesized and characterized by melting points, elemental analysis, thermal studies, and electronic and IR spectroscopy. The enthalpies of dissolution of the adducts, metal(II) bromides and aniline in methanol, aqueous 1.2M HCl or 25% (v/v) aqueous 1.2M HCl in methanol were measured. The following thermochemical parameters for the adducts have been determined by thermochemical cycles: the standard enthalpies for the Lewis acid/base reactions (Δ r H o ), the standard enthalpies of formation (Δ f H o ), the standard enthalpies of decomposition (Δ D H o ), the lattice standard enthalpies (Δ M H o ) and the standard enthalpies of the Lewis acid/base reactions in the gaseous phase (Δ r H o (g)). The mean bond dissociation enthalpies of the M(II)-nitrogen bonds (D-bar (M?N) ) and the enthalpies of formation of the adducts from the ions in the gaseous phase: M 2+ (g) +Br - (g) +an (g) ->[MBr 2 (an) 2 ] (g) (Δ fi H o ) have been estimated

  18. Poly aniline Nano fiber as Modified Cladding for Optical Fiber Sensor to Detect Acetone Vapor

    International Nuclear Information System (INIS)

    Akhiruddin maddu; Ahmad aminuddin; Setyanto Tri Wahyudi; Hamdani Zain

    2008-01-01

    In this research, we used poly aniline nano fiber as modified cladding material for a fiber optic sensor system to detect the acetone vapor. The sensor was designed based on variation of evanescent field absorption on the core-modified cladding interface when exposed with varied acetone vapor. Poly aniline nano fiber synthesized by interfacial polymerization was coated onto the un-cladded core and acts as sensing element. Response of the fiber optic sensor was investigated by measuring the transmission light intensity via fiber optic sensor system while exposed with acetone vapor. Based on the sensor response curve, it is obtained a very fast response time of 30 s and recovery time of 10 s. The fiber optic sensor also exhibits a good reversibility and repeatability. Sensitivity of the sensor to variation of acetone vapor pressure was obtained 1.25 %/mmHg, that means the transmission intensity of the sensor changes 1.25 % for acetone vapor change of 1 mmHg. (author)

  19. Simultaneous oxidation of aniline and tannic acid with peroxydisulfate: self-assembly of oxidation products from nanorods to microspheres

    Czech Academy of Sciences Publication Activity Database

    Janoševic, A.; Ciric-Marjanovic, G.; Šljukic Paunkovic, B.; Pašti, I.; Trifunovic, S.; Marjanovic, B.; Stejskal, Jaroslav

    2012-01-01

    Roč. 162, 9/10 (2012), s. 843-856 ISSN 0379-6779 R&D Projects: GA ČR GA202/09/1626 Institutional research plan: CEZ:AV0Z40500505 Institutional support: RVO:61389013 Keywords : copolymerization * anilin e * tannic acid Subject RIV: BK - Fluid Dynamics Impact factor: 2.109, year: 2012

  20. Ruthenium-catalysed synthesis of 2- and 3-substituted quinolines from anilines and 1,3-diols

    DEFF Research Database (Denmark)

    Monrad, Rune Nygaard; Madsen, Robert

    2011-01-01

    A straightforward synthesis of substituted quinolines is described by cyclocondensation of anilines with 1,3-diols. The reaction proceeds in mesitylene solution with catalytic amounts of RuCl3·xH 2O, PBu3 and MgBr2·OEt2. The transformation does not require any stoichiometric additives and only...

  1. The influence of the matrix structure on the oxidation of aniline in a silica sol-gel composite

    International Nuclear Information System (INIS)

    Widera, J.; Kijak, A.M.; Ca, D.V.; Pacey, G.E.; Taylor, R.T.; Perfect, H.; Cox, J.A.

    2005-01-01

    Mesoporous and microporous silica matrices were formed on indium tin oxide electrodes for liquid-phase voltammetry and as monoliths for solid-state voltammetry of aniline. The pore structure, which was verified by scanning probe microscopy and by surface area measurement, was directed by either control of pH during sol-gel processing or by inclusion of a templating agent. Whether aniline was included as a dopant in the sol-gel or as a component of the contacting liquid, the pore size influenced the coupling of the product of its electrochemical oxidation. With microporous silica, the dominant products were dimers and related short-chain products whereas with mesoporous silica, polymerization was suggested. As a step toward the formation of polyaniline (PANI) that is covalently anchored to the sol-gel, the electrochemistry of aniline was investigated using composites prepared from sols comprising tetraethyl orthosilicate (TEOS), 3-aminophenyl-[3-triethoxylsilyl)-propyl] urea (ormosil), and aniline in various ratios. Combinatorial chemistry identified that the optimum combination of silica precursors in terms of obtaining PANI was a 1:12 mole ratio of ormosil:TEOS

  2. Proteogenomic Characterization of Monocyclic Aromatic Hydrocarbon Degradation Pathways in the Aniline-Degrading Bacterium Burkholderia sp. K24.

    Directory of Open Access Journals (Sweden)

    Sang-Yeop Lee

    Full Text Available Burkholderia sp. K24, formerly known as Acinetobacter lwoffii K24, is a soil bacterium capable of utilizing aniline as its sole carbon and nitrogen source. Genomic sequence analysis revealed that this bacterium possesses putative gene clusters for biodegradation of various monocyclic aromatic hydrocarbons (MAHs, including benzene, toluene, and xylene (BTX, as well as aniline. We verified the proposed MAH biodegradation pathways by dioxygenase activity assays, RT-PCR, and LC/MS-based quantitative proteomic analyses. This proteogenomic approach revealed four independent degradation pathways, all converging into the citric acid cycle. Aniline and p-hydroxybenzoate degradation pathways converged into the β-ketoadipate pathway. Benzoate and toluene were degraded through the benzoyl-CoA degradation pathway. The xylene isomers, i.e., o-, m-, and p-xylene, were degraded via the extradiol cleavage pathways. Salicylate was degraded through the gentisate degradation pathway. Our results show that Burkholderia sp. K24 possesses versatile biodegradation pathways, which may be employed for efficient bioremediation of aniline and BTX.

  3. The oxidation of aniline with p-benzoquinone and its impact on the preparation of the conducting polymer, polyaniline

    Czech Academy of Sciences Publication Activity Database

    Stejskal, Jaroslav; Bober, Patrycja; Trchová, Miroslava; Horský, Jiří; Pilař, Jan; Walterová, Zuzana

    2014-01-01

    Roč. 192, June (2014), s. 66-73 ISSN 0379-6779 R&D Projects: GA ČR(CZ) GA13-00270S Institutional support: RVO:61389013 Keywords : aniline * p-benzoquinone * 2,5-dianilino-p-benzoquinone Subject RIV: CD - Macromolecular Chemistry Impact factor: 2.252, year: 2014

  4. Proteogenomic Characterization of Monocyclic Aromatic Hydrocarbon Degradation Pathways in the Aniline-Degrading Bacterium Burkholderia sp. K24

    Science.gov (United States)

    Yun, Sung Ho; Choi, Chi-Won; Yi, Yoon-Sun; Kim, Jonghyun; Chung, Young-Ho; Park, Edmond Changkyun; Kim, Seung Il

    2016-01-01

    Burkholderia sp. K24, formerly known as Acinetobacter lwoffii K24, is a soil bacterium capable of utilizing aniline as its sole carbon and nitrogen source. Genomic sequence analysis revealed that this bacterium possesses putative gene clusters for biodegradation of various monocyclic aromatic hydrocarbons (MAHs), including benzene, toluene, and xylene (BTX), as well as aniline. We verified the proposed MAH biodegradation pathways by dioxygenase activity assays, RT-PCR, and LC/MS-based quantitative proteomic analyses. This proteogenomic approach revealed four independent degradation pathways, all converging into the citric acid cycle. Aniline and p-hydroxybenzoate degradation pathways converged into the β-ketoadipate pathway. Benzoate and toluene were degraded through the benzoyl-CoA degradation pathway. The xylene isomers, i.e., o-, m-, and p-xylene, were degraded via the extradiol cleavage pathways. Salicylate was degraded through the gentisate degradation pathway. Our results show that Burkholderia sp. K24 possesses versatile biodegradation pathways, which may be employed for efficient bioremediation of aniline and BTX. PMID:27124467

  5. Sulfonato-imino copper(ii) complexes: fast and general Chan-Evans-Lam coupling of amines and anilines.

    Science.gov (United States)

    Hardouin Duparc, V; Schaper, F

    2017-10-14

    Sulfonato-imine copper complexes with either chloride or triflate counteranions were prepared in a one-step reaction followed by anion-exchange. They are highly active in Chan-Evans-Lam couplings under mild conditions with a variety of amines or anilines, in particular with sterically hindered substrates. No optimization of reaction conditions other than time and/or temperature is required.

  6. Evaluation Study Of Inhibition And Regeneration Characters For Substituted Anilines Extracted From Crude Oil

    Directory of Open Access Journals (Sweden)

    Dr. Mohammad Jamil Abd-Alghani

    2015-08-01

    Full Text Available Abstract Aniline derivatives containing carbonyl group in the side chain was extracted from crude oil received from Al- Dora refinery. The crude oil was dissolved in xylene 13 and extracted through a column containing activated cationic resin type Amberlyte 15 then eluted by absolute ethanol and identified by infra red spectroscopy then examined as antioxidant for lubricant oil stock 50. FT-IR spectroscopy for the lubricant oil was performed before employing in an internal combustion engine and 190 hrs after. It was seen that the FT-IR of the oxidized oil contains a new peak in the region 1700 1800 cm1 which is formed due to the oxidation of base oil which belongs to carbonyl group. The FT-IR specter for the formulated crude oil with a specific concentration of the extracted substituted aniline after applying the same conditions of oxidation 190 working hrs. in an internal combustion engine showed a minimum peak intensity at 1710 1770 cm-1 than that observed in FT-IR done in absence of extracted antioxidant. The values of induction periods in presence of 0.20 and 0.30 moll of the extracted sample in the lubricant oil at 393 K were 766 sec. 1630 sec. while in their absence was 55 sec.. The values of maximum rates of oxidation were 3.0x10-4 and 2.0x10-4 moll. sec. These values were still not arrived the value of maximum rate of oxidation for the lubricant oil 3.5 x10-4 mol.l.sec. The same study was applied on the universal antioxidant inhibitor 2 6-diter-butyl-4-methyl phenol phenolic type under the same conditions. The obtained induction periods were 150 290 sec. respectively. This means that the values of induction periods obtained by formulating the lubricant oil with the extracted aniline molecule were 7 times greater than do the 2 6- diter-butyl-4-methyl phenol molecule. From the literatures it is known that the value of stochiometric factor for inhibition f for 2 4 6-triisobutyl phenol is equal to 2 so as a result the value of stochiometric

  7. Study of the rearrangement of N-alkylaniline to p-aminoalkylbencene. I. N-ethyl-l-14C-aniline

    International Nuclear Information System (INIS)

    Molera, M. J.; Gamboa, J. M.; Val Cob, M. del

    1961-01-01

    The rearrangement of N-ethylaniline to p-aminoethylbenzene has been studied over the temperature range 200-300 degree centigrade using different catalysts: Cl 2 Co, Cl 2 Zn, Cl 2 Ni, Cl 3 Al, Cl 2 Cd and Br H.N-ethyl-1- 1 4C-aniline has been synthesized from ethyl-1- 1 4C-iodide and aniline and its rearrangement to p-aminoethyl-benzene proves that the ethyl group does not rearrange itself during the reaction. A scheme for the degradation of both the N-ethyl-1- 1 4C aniline and the p-aminoethylbenzene produces is described. (Author) 14 refs

  8. N-Acetyl-4-aminophenol (paracetamol), N-acetyl-2-aminophenol and acetanilide in urine samples from the general population, individuals exposed to aniline and paracetamol users.

    Science.gov (United States)

    Dierkes, Georg; Weiss, Tobias; Modick, Hendrik; Käfferlein, Heiko Udo; Brüning, Thomas; Koch, Holger M

    2014-01-01

    Epidemiological studies suggest associations between the use of N-acetyl-4-aminophenol (paracetamol) during pregnancy and increased risks of reproductive disorders in the male offspring. Previously we have reported a ubiquitous urinary excretion of N-acetyl-4-aminophenol in the general population. Possible sources are (1) direct intake of paracetamol through medication, (2) paracetamol residues in the food chain and (3) environmental exposure to aniline or related substances that are metabolized into N-acetyl-4-aminophenol. In order to elucidate the origins of the excretion of N-acetyl-4-aminophenol in urine and to contribute to the understanding of paracetamol and aniline metabolism in humans we developed a rapid, turbulent-flow HPLC-MS/MS method with isotope dilution for the simultaneous quantification of N-acetyl-4-aminophenol and two other aniline related metabolites, N-acetyl-2-aminophenol and acetanilide. We applied this method to three sets of urine samples: (1) individuals with no known exposure to aniline and also no recent paracetamol medication; (2) individuals after occupational exposure to aniline but no paracetamol medication and (3) paracetamol users. We confirmed the omnipresent excretion of N-acetyl-4-aminophenol. Additionally we revealed an omnipresent excretion of N-acetyl-2-aminophenol. In contrast, acetanilide was only found after occupational exposure to aniline, not in the general population or after paracetamol use. The results lead to four preliminary conclusions: (1) other sources than aniline seem to be responsible for the major part of urinary N-acetyl-4-aminophenol in the general population; (2) acetanilide is a metabolite of aniline in man and a valuable biomarker for aniline in occupational settings; (3) aniline baseline levels in the general population measured after chemical hydrolysis do not seem to originate from acetanilide and hence not from a direct exposure to aniline itself and (4) N-acetyl-2-aminophenol does not seem to be

  9. Fabrication and characterization of self-doped poly(aniline-co-anthranilic acid) nanorods in bundles

    International Nuclear Information System (INIS)

    Han Dongxue; Song Jixia; Ding Xuefeng; Xu Xiaoyu; Niu Li

    2007-01-01

    Poly(aniline-co-anthranilic acid) (PANANA) nanorods in bundles was prepared successfully in an alcohol/aqueous media without assistance of any other kinds of acids. Anthranilic acid played all roles of monomer, acid-media provider, and dopant in the reaction system, and ammonium persulfate (APS) served as the oxidant. The morphologies of PANANA nanorods in bundles were investigated by scanning electron microscopy (SEM). Influences of the monomer molar ratio on the resulting morphology were investigated. Moreover the formation mechanism of the nanostructured copolymer was proposed. FT-IR, UV-vis and X-ray diffraction (XRD) measurements were used to confirm the molecular and electrical structure of the self-doped PANANA. The intrinsic properties, such as conductivity, electrochemical redox activity and room-temperature solubility of the resulting copolymer were explored

  10. Equilibrium Adsorption of heavy Metals from Aqueous Solutions onto Poly aniline Stannic(IV) Phosphate Composite

    International Nuclear Information System (INIS)

    El-Zahhar, A.A.; EI-Shourbagy, M.M.; Shady, S.A.

    2012-01-01

    An adsorbent material has been prepared by immobilization of stannic(IV) phosphate within poly aniline composite. The produced adsorbent exhibit a high adsorption potential for Pb(II), Cd(Il) and Zn(lI) from aqueous solutions. The influence of initial metal ion concentration, adsorbent dose, ph and temperature on metal ion removal has been studied. The process was found to follow a first order rate kinetics. Thc intra-particle diffusion of metal ions through pores in the adsorbent was to be the main rate limiting step. The equilibrium data fit well with Langmuir adsorption isotherm model. The selectivity order of the adsorbent towards the metal ions was Pb(Il) > Cd(Il) >Zn(II). The adsorption rate constant and thermodynamic parameters were also given to predict the nature of adsorption

  11. Application of electrosynthesized poly(aniline-co-p-aminophenol) as a catechol sensor

    International Nuclear Information System (INIS)

    Chen Chuanxiang; Sun Cheng; Gao Yuhua

    2009-01-01

    Poly(aniline-co-p-aminophenol) (copolymer) film was used as a sensor to determine the presence of catechol, taking advantage of the ability of the film to effectively catalyze the oxidation of catechol. The copolymer served as an electron transfer mediator between the electrode surface and catechol in the solution. The response current of the catechol sensor depended on the applied potential, pH and temperature at a given concentration of catechol. At optimum conditions, the catechol sensor displayed an excellent electrocatalytic response to the detection of catechol in a concentration range from 5 to 500 μM with a detection limit of 0.8 μM. The effects of selected organic compounds on the response of the catechol sensor were studied. Together, these findings show that the catechol sensor exhibits a better selectivity towards interfering species and a better operational and storage stability

  12. Biocompatible Electroactive Tetra(aniline)-Conjugated Peptide Nanofibers for Neural Differentiation.

    Science.gov (United States)

    Arioz, Idil; Erol, Ozlem; Bakan, Gokhan; Dikecoglu, F Begum; Topal, Ahmet E; Urel, Mustafa; Dana, Aykutlu; Tekinay, Ayse B; Guler, Mustafa O

    2018-01-10

    Peripheral nerve injuries cause devastating problems for the quality of patients' lives, and regeneration following damage to the peripheral nervous system is limited depending on the degree of the damage. Use of nanobiomaterials can provide therapeutic approaches for the treatment of peripheral nerve injuries. Electroactive biomaterials, in particular, can provide a promising cure for the regeneration of nerve defects. Here, a supramolecular electroactive nanosystem with tetra(aniline) (TA)-containing peptide nanofibers was developed and utilized for nerve regeneration. Self-assembled TA-conjugated peptide nanofibers demonstrated electroactive behavior. The electroactive self-assembled peptide nanofibers formed a well-defined three-dimensional nanofiber network mimicking the extracellular matrix of the neuronal cells. Neurite outgrowth was improved on the electroactive TA nanofiber gels. The neural differentiation of PC-12 cells was more advanced on electroactive peptide nanofiber gels, and these biomaterials are promising for further use in therapeutic neural regeneration applications.

  13. Electrochemical synthesis of poly(aniline-co-fluoroaniline) films and their application as humidity sensing material

    International Nuclear Information System (INIS)

    Sharma, Amit L.

    2009-01-01

    In the present manuscript, humidity sensing properties of a copolymer, poly(aniline-co-fluoroaniline) have been reported. The copolymer was prepared on indium-tin-oxide coated glass plates as well as platinum surface in the form of films using electrochemical technique (versus standard calomel electrode) in acidic medium. Synthesis of copolymer films was supported by Fourier transform infra-red, ultraviolet-visible, scanning electron microscope and cyclic voltammetry techniques. Molecular weight and electrical conductivity of these films were measured at different temperature. Polyaniline and poly(2-fluoroaniline) films were also synthesized using the same technique to compare the data with copolymer film. On exposure to humid atmosphere, the response behaviour of copolymer film exhibited a change in resistance with respect to relative humidity (RH). This copolymer film was found to be most sensitive in the 30-65% RH range and shows a linear behaviour with in this range.

  14. The use of poly(ethylene terephthalate)-poly(aniline) composite for trypsin immobilisation

    Energy Technology Data Exchange (ETDEWEB)

    Caramori, S.S. [Laboratorio de Quimica de Proteinas, Departamento de Bioquimica e Biologia Molecular, Instituto de Ciencias Biologicas, Universidade Federal de Goias, Cx. Postal 131, 74001-970 Goiania-GO (Brazil)], E-mail: samanthabio@hotmail.com; Fernandes, K.F. [Laboratorio de Quimica de Proteinas, Departamento de Bioquimica e Biologia Molecular, Instituto de Ciencias Biologicas, Universidade Federal de Goias, Cx. Postal 131, 74001-970 Goiania-GO (Brazil)], E-mail: katia@icb.ufg.br

    2008-08-01

    This paper presents trypsin immobilisation on strips of poly(ethylene terephthalate)-poly(aniline), activated with glutaraldehyde (PET-PANIG) composite. The photomicrography of the material showed changes corresponding to the chemical modifications produced in the steps of synthesis. The immobilisation process was very efficient under optimal conditions (18.6%). The immobilised and free enzyme presented the same pH and temperature optimum. PET-PANIG-trypsin was able to hydrolyse casein, albumin, gelatine, and skimmed milk. Km{sub app} value for PET-PANIG-trypsin was very close to Km of the free enzyme for casein. Immobilised trypsin showed higher stability than the free enzyme, with 100% activity after 14 days of storage at 4 deg. C and 100% operational stability after 4 cycles of use.

  15. Electron momentum spectroscopy of aniline taking account of nuclear dynamics in the initial electronic ground state

    International Nuclear Information System (INIS)

    Farasat, M; Golzan, M M; Shojaei, S H R; Morini, F; Deleuze, M S

    2016-01-01

    The electronic structure, electron binding energy spectrum and (e, 2e) momentum distributions of aniline have been theoretically predicted at an electron impact energy of 1.500 keV on the basis of Born–Oppenheimer molecular dynamical simulations, in order to account for thermally induced nuclear motions in the initial electronic ground state. Most computed momentum profiles are rather insensitive to thermally induced alterations of the molecular structure, with the exception of the profiles corresponding to two ionization bands at electron binding energies comprised between ∼10.0 and ∼12.0 eV (band C) and between ∼16.5 and ∼20.0 eV (band G). These profiles are found to be strongly influenced by nuclear dynamics in the electronic ground state, especially in the low momentum region. The obtained results show that thermal averaging smears out most generally the spectral fingerprints that are induced by nitrogen inversion. (paper)

  16. Beyer's non-linearity parameter (B/A) in benzylidene aniline Schiff base liquid crystalline systems

    International Nuclear Information System (INIS)

    Nagi Reddy, M.V.V.; Pisipati, V.G.K.M.; Madhavi Latha, D.; Datta Prasad, P.V.

    2011-01-01

    The non-linearity parameter B/A is estimated for a number of liquid crystal materials of the type N-(p-n-alkoxy benzylidene)-p-n-alkyl anilines, popularly known as nO.m, where n and m are the aliphatic chains on either side of the rigid core, which can be varied from 1 to 18 to realize a number of LC materials with a variety LC phase variants. The B/A values are computed from both density and sound velocity data following standard relations reported in literature. This systematic study in a homologous series provides an opportunity to study how this parameter behaves with (1) either the alkoxy and/or alkyl chain number, (2) with the total chain number (n+m), (3) with increase in molecular weight and (4) whether the linear relations reported in literature either with αT [thermal expansion coefficient (α) and temperature (T)] and sound velocity (u) will hold good or not and if so to what extent. The results are discussed with the body of data available in literature on liquids, liquid mixtures and other LC materials. -- Research highlights: → The Bayer's non-linearity parameter (B/A) is estimated for the first time for a number liquid crystal materials of the type N-(p-n-alkoxy benzylidene)-p-nalkyl anilines. → The magnitude of B/A estimated from sound velocity data is higher compared to that estimated thermal expansion data. → The B/A value decreases with increase in molecular weight with an even odd fashion and reaches a minimum value and saturates. → These studies reveal that both the thermal expansion coefficient and sound velocity are the tools to estimate the non-linear parameter B/A in the case of liquid crystals.

  17. Study of the rearrangement of N-alkylanilines to P-aminoalkylbencene. III. N-n-propil-l-14C aniline

    International Nuclear Information System (INIS)

    Molera, J. M.; Gamboa, J. M.; Val del Cob, M.; Ortin, N.

    1964-01-01

    The rearrangement of N-n-propyl aniline to p-amino propylbenzene has been studied at 250 degree centigrade using several catalysts: CoCl 2 , ZnCl 2 and HBr. N-propyl-1-14 C -aniline has been synthesized from sodium propionate-1-14 C through conversion to n-propyl-1-14 C -iodide and further reaction with aniline. After the rearrangement and among the reaction products both p-aminopropylbenzene and p-aminoisopropylbencene were found. To determine the 14 C position in both the starting aniline and reaction products two degradation schemes are followed. In the light of experimental evidence a mechanism is set forth based on the assumption of an organic cation as intermediate. (Author) 13 refs

  18. Effect of ortho-substituted aniline on the corrosion protection of aluminum in 2 mol/L H2SO4 solution

    KAUST Repository

    El-Deeb, Mohamed M.; Alshammari, Hamed M.; Abdel-Azeim, Safwat

    2017-01-01

    Corrosion protection of aluminum in 2 mol/L HSO solution is examined in the presence of ortho-substituted aniline derivatives using potentiodynamic polarization and electrochemical impedance spectroscopy measurements. Density function theory (DFT

  19. Study of the growth and pyroelectric properties of TGS crystals doped with aniline-family dipolar molecules

    Science.gov (United States)

    Zhang, Kecong; Song, Jiancheng; Wang, Min; Fang, Changshui; Lu, Mengkai

    1987-04-01

    TGS crystals doped with aniline-family dipolar molecules (aniline, 2-aminobenzoic acid, 3-aminobenzoic acid, 3-aminobenzene-sulphonic acid, 4-aminobenzenesulphonic acid and 4-nitroraniline) have been grown by the slow-cooling solution method. The influence of these dopants on the growth habits, crystal morphology pyroelectric properties, and structure parameters of TGS crystals has been systematically investigated. The effects of the domain structure of the seed crystal on the pyroelectric properties of the doped crystals have been studied. It is found that the spontaneous polarization (P), pyroelectric coefficient (lambda), and internal bias field of the doped crystals are slightly higher than those of the pure TGS, and the larger the dipole moment of the dopant molecule, the higher the P and lambda of the doped TGS crystal.

  20. Preparation and enhanced electrochemical properties of nano-sulfur/poly(pyrrole-co-aniline) cathode material for lithium/sulfur batteries

    International Nuclear Information System (INIS)

    Qiu Linlin; Zhang Shichao; Zhang Lan; Sun, Mingming; Wang Weikun

    2010-01-01

    Poly(pyrrole-co-aniline) (PPyA) copolymer nanofibers were prepared by chemical oxidation method with cetyltrimethyl ammonium chloride (CTAC) as template, and the nano-sulfur/poly(pyrrole-co-aniline) (S/PPyA) composite material in lithium batteries was achieved via co-heating the mixture of PPyA and sublimed sulfur at 160 deg. C for 24 h. The component and structure of the materials were characterized by FTIR, Raman, XRD, and SEM. PPyA with nanofiber network structure was employed as a conductive matrix, adsorbing agent and firm reaction chamber for the sulfur cathode materials. The nano-dispersed composite exhibited a specific capacity up to 1285 mAh g -1 in the initial cycle and remained 866 mAh g -1 after 40 cycles.

  1. Ultraviolet relaxation dynamics of aniline, N, N-dimethylaniline and 3,5-dimethylaniline at 250 nm

    Energy Technology Data Exchange (ETDEWEB)

    Thompson, James O. F.; Saalbach, Lisa; Crane, Stuart W. [Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom); Paterson, Martin J. [Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom); Townsend, Dave, E-mail: D.Townsend@hw.ac.uk [Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom); Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom)

    2015-03-21

    Time-resolved photoelectron imaging was used to investigate the electronic relaxation dynamics of gas-phase aniline, N, N-dimethylaniline, and 3,5-dimethylaniline following ultraviolet excitation at 250 nm. Our analysis was supported by ab initio coupled-cluster calculations evaluating excited state energies and (in aniline) the evolution of a range of excited state physical properties as a function of N–H bond extension. Due to a lack of consistency between several earlier studies undertaken in aniline, the specific aim of this present work was to gain new insight into the previously proposed non-adiabatic coupling interaction between the two lowest lying singlet excited states S{sub 1}(ππ{sup ∗}) and S{sub 2}(3s/πσ{sup ∗}). The methyl-substituted systems N, N-dimethylaniline and 3,5-dimethylaniline were included in order to obtain more detailed dynamical information about the key internal molecular coordinates that drive the S{sub 1}(ππ{sup ∗})/S{sub 2}(3s/πσ{sup ∗}) coupling mechanism. Our findings suggest that in all three systems, both electronic states are directly populated during the initial excitation, with the S{sub 2}(3s/πσ{sup ∗}) state then potentially decaying via either direct dissociation along the N–X stretching coordinate (X = H or CH{sub 3}) or internal conversion to the S{sub 1}(ππ{sup ∗}) state. In aniline and N, N-dimethylaniline, both pathways most likely compete in the depletion of S{sub 2}(3s/πσ{sup ∗}) state population. However, in 3,5-dimethylaniline, only the direct dissociation mechanism appears to be active. This is rationalized in terms of changes in the relative rates of the two decay pathways upon methylation of the aromatic ring system.

  2. STUDIES ON THE INITIATION MECHANISM OF ORGANIC PEROXIDE AND N-METHACRYLOYLOXYETHYL-N-METHYL ANILINE IN METHYL METHACRYLATE POLYMERIZATION

    Institute of Scientific and Technical Information of China (English)

    QIU Kunyuan; GUO Dajie; GUO Xinqiu; FENG Xinde

    1990-01-01

    The initiation mechanism of methyl methacrylate (MMA) polymerization by organic peroxide and polymerizable aromatic tertiary amine such as N-methacryloyloxyethyl-N-methyi aniline (MEMA) binary system has been studied. The kinetics of polymerization of MMA and the ESR spectra of organic peroxide/MEMA system were determined. Based on the ESR study and the end-group analysis by UV spectra of the polymer formed, the initiation mechanism is proposed.

  3. Synthesis of substituted bromobenzene derivatives via bromoanilines. A moderately selective ortho-bromination of [14C]-aniline

    International Nuclear Information System (INIS)

    Weller, P.E.; Hanzlik, R.P.

    1988-01-01

    The synthesis of [ 14 C]-labeled bromobenzene, 2-bromophenol, 4-bromophenol, 1,2-dibromobenzene, 2-bromobenzonitrile, 2-bromotoluene, and 2-bromoanisole are reported. [ 14 C]-Aniline is selectively monobrominated to ortho- and para-bromoanilines in 5 to 3 ratio. The separated bromoanilines are diazotized and either reduced, hydrolyzed, coupled to bromide, coupled to cyanide, or coupled to carbon. 2-Bromophenol is O-methylated to 2-bromoanisole. (author)

  4. Wood Colorization through Pressure Treating: The Potential of Extracted Colorants from Spalting Fungi as a Replacement for Woodworkers’ Aniline Dyes

    Directory of Open Access Journals (Sweden)

    Sara C. Robinson

    2014-07-01

    Full Text Available The extracellular colorants produced by Chlorociboria aeruginosa, Scytalidium cuboideum, and Scytalidium ganodermophthorum, three commonly utilized spalting fungi, were tested against a standard woodworker’s aniline dye to determine if the fungal colorants could be utilized in an effort to find a naturally occurring replacement for the synthetic dye. Fungal colorants were delivered in two methods within a pressure treater—the first through solubilization of extracted colorants in dichloromethane, and the second via liquid culture consisting of water, malt, and the actively growing fungus. Visual external evaluation of the wood test blocks showed complete surface coloration of all wood species with all colorants, with the exception of the green colorant (xylindein from C. aeruginosa in liquid culture, which did not produce a visible surface color change. The highest changes in external color came from noble fir, lodgepole pine, port orford cedar and sugar maple with aniline dye, cottonwood with the yellow colorant in liquid culture, lodgepole pine with the red colorant in liquid culture, red alder and Oregon maple with the green colorant in dichloromethane, and sugar maple and port orford cedar with the yellow colorant in dichloromethane. The aniline dye was superior to the fungal colorants in terms of internal coloration, although none of the tested compounds were able to completely visually color the inside of the test blocks.

  5. Gas chromatographic/mass spectrometric determination of aniline in foods oils associated with the Spanish toxic oil syndrome

    International Nuclear Information System (INIS)

    Hill, R.H. Jr.; Todd, G.D.; Kilbourne, E.M.; Cline, R.E.; McCraw, J.; Orti, D.L.; Bailey, S.L.; Needham, L.L.

    1987-01-01

    In 1981, a new disease, known today as the toxic oil syndrome (TOS), descended upon the people of Spin. A strong association between TOS and contaminated food oil was established early. Subsequent investigations implicated food oils containing rapeseed oil denatured with aniline. However, little aniline was found in the oils; some other etiologic agent in the oil had apparently produced the illness. Many researchers have investigated these oils, but the specific etiologic agent has not been identified. Significant progress in this research has been hampered by the difficulty in identifying the specific oil samples that produced illness in specific TOS cases. In 1984, the Spanish Government invited the Centers for Disease Control (CDC) to participate in its research efforts to study the TOS problem. One of the authors was detailed to Spain to assist in the study of the illness. Part of their work in this area has been an attempt in their laboratories to classify a group of blind-coded case and control oils according to selected chemical measurements. They report here a newly developed method for determining aniline in these oils and the results of these analyses

  6. Multi-signalling cation sensing behaviour of a bis(pyridin-2-yl methyl)aniline based hetarylazo dye

    International Nuclear Information System (INIS)

    Kaur, Paramjit; Sareen, Divya; Kaur, Mandeep; Singh, Kamaljit

    2013-01-01

    Graphical abstract: The chromogenic and electrochemical behaviour of bis(pyridine-2-yl methyl)aniline based hetarylazo dye gets perturbed in the presence of cations, most effective being Cu 2+ . The conversion of ICT to ICT/MLCT is witnessed by TD-DFT calculations. -- Highlights: •Cation sensing of hetarylazo dye based upon visual, absorption and electrochemical changes is described. •Sensing mechanism is based upon perturbation in intramolecular charge-transfer upon interaction with cations. •Sensing protocol is supported by 1 H NMR studies as well as theoretical calculations. •Hetarylazo dye acts as a multichannel sensor. •Response of the dye towards various cations has also been explored in acidic pH window. -- Abstract: We investigated the cation sensing behaviour of a bis(pyridin-2-yl methyl)aniline appended hetarylazo dye via chromogenic and electrochemical transduction channels. The binding pocket constituting both the pyridyl as well as aniline nitrogen atoms acts as recognition site for the cations and consequent perturbation in the intramolecular charge-transfer prevailing in the dye results in the chromogenic response manifested in the form of hypsochromic shift in the intramolecular charge-transfer band and the attendant naked-eye color changes. The dye exhibits significant changes in its electrochemical behaviour in the presence of cations. The experimental results are also rationalized by time-dependent density functional theory (TD-DFT) calculations

  7. Strong adsorbability of mercury ions on aniline/sulfoanisidine copolymer nanosorbents.

    Science.gov (United States)

    Li, Xin-Gui; Feng, Hao; Huang, Mei-Rong

    2009-01-01

    The highest Hg-ion adsorbance so far, namely up to 2063 mg g(-1), has been achieved by poly(aniline-co-5-sulfo-2-anisidine) nanosorbents. Sorption of Hg ions occurs mainly by redox and chelation mechanisms (see scheme), but also by ion exchange and physisorption.Poly(aniline (AN)-co-5-sulfo-2-anisidine (SA)) nanoparticles were synthesized by chemical oxidative copolymerization of AN and SA monomers, and their extremely strong adsorption of mercury ions in aqueous solution was demonstrated. The reactivity ratios of AN and SA comonomers were found to be 2.05 and 0.02, respectively. While AN monomer tends to homopolymerize, SA monomer tends to copolymerize with AN monomer because of the great steric hindrance and electron-attracting effect of the sulfo groups, despite the effect of conjugation of the methoxyl group with the benzene ring. The effects of initial mercury(II) concentration, sorption time, sorption temperature, ultrasonic treatment, and sorbent dosage on mercury-ion sorption onto AN/SA (50/50) copolymer nanoparticles with a number-average diameter of around 120 nm were significantly optimized. The results show that the maximum Hg-ion sorption capacity on the particulate nanosorbents can even reach 2063 mg of Hg per gram of sorbent, which would be the highest Hg-ion adsorbance so far. The sorption data fit to the Langmuir isotherm, and the process obeys pseudo-second-order kinetics. The IR and UV/Vis spectral data of the Hg-loaded copolymer particles suggest that some mercury(II) was directly reduced by the copolymer to mercury(I) and even mercury(0). A mechanism of sorption between the particles and Hg ions in aqueous solution is proposed, and a physical/ion exchange/chelation/redox sorption ratio of around 2/3/45/50 was found. Copolymer nanoparticles may be one of the most powerful and cost-effective sorbents of mercury ions, with a wide range of potential applications for the efficient removal and even recovery of the mercury ions from aqueous solution.

  8. Heat capacity and thermodynamic properties of N-(2-cyanoethyl) aniline (C9H10N2)

    International Nuclear Information System (INIS)

    Tian Qifeng; Tan Zhicheng; Shi Quan; Xu Fen; Sun Lixian; Zhang Tao

    2005-01-01

    The low temperature heat capacities of N-(2-cyanoethyl)aniline were measured with an automated adiabatic calorimeter over the temperature range from 83 to 353 K. The temperature corresponding to the maximum value of the apparent heat capacity in the fusion interval, molar enthalpy and entropy of fusion of this compound were determined to be 323.33 ± 0.13 K, 19.4 ± 0.1 kJ mol -1 and 60.1 ± 0.1 J K -1 mol -1 , respectively. Using the fractional melting technique, the purity of the sample was determined to be 99.0 mol% and the melting temperature for the tested sample and the absolutely pure compound were determined to be 323.50 and 323.99 K, respectively. A solid-to-solid phase transition occurred at 310.63 ± 0.15 K. The molar enthalpy and molar entropy of the transition were determined to be 980 ± 5 J mol -1 and 3.16 ± 0.02 J K -1 mol -1 , respectively. The thermodynamic functions of the compound [H T - H 298.15 ] and [S T - S 298.15 ] were calculated based on the heat capacity measurements in the temperature range of 83-353 K with an interval of 5 K

  9. Assessing and grouping chemicals applying partial ordering Alkyl anilines as an illustrative example.

    Science.gov (United States)

    Carlsen, Lars; Bruggemann, Rainer

    2018-06-03

    In chemistry there is a long tradition in classification. Usually methods are adopted from the wide field of cluster analysis. Here, based on the example of 21 alkyl anilines we show that also concepts taken out from the mathematical discipline of partially ordered sets may also be applied. The chemical compounds are described by a multi-indicator system. For the present study four indicators, mainly taken from the field of environmental chemistry were applied and a Hasse diagram was constructed. A Hasse diagram is an acyclic, transitively reduced, triangle free graph that may have several components. The crucial question is, whether or not the Hasse diagram can be interpreted from a structural chemical point of view. This is indeed the case, but it must be clearly stated that a guarantee for meaningful results in general cannot be given. For that further theoretical work is needed. Two cluster analysis methods are applied (K-means and a hierarchical cluster method). In both cases the partitioning of the set of 21 compounds by the component structure of the Hasse diagram appears to be better interpretable. Copyright© Bentham Science Publishers; For any queries, please email at epub@benthamscience.org.

  10. Curing of bisphenol A-aniline based benzoxazine using phenolic, amino and mercapto accelerators

    Directory of Open Access Journals (Sweden)

    A. Rucigaj

    2015-07-01

    Full Text Available The curing of bisphenol A-aniline based benzoxazine was studied applying different accelerators (4,4'-thiodiphenol, o-dianisidine, 2-mercaptobenzimidazole and 4-mercaptophenol to initiate the catalytic ring-opening of benzoxazine. Possible pathways of benzoxazine ring-opening, polymerization and cross-linking without and with the addition of different accelerators are presented. The curing kinetics was investigated by model-free kinetic analysis of experimental data obtained by differential scanning calorimetry (DSC. The addition of different accelerators significantly reduced the onset temperature of curing in dynamic experiments. The effects of accelerators on the results of isothermal conversion prediction were studied and discussed in detail. Among the used accelerators, thiodiphenol showed the best accelerating efficiency and was consequently used in further studies, where its amount was varied. By low heating rate DSC analysis the catalytic ring-opening, thermally accelerated ring-opening and the diffusion-controlled steps were identified. The amount of added accelerator affected particularly the ring-opening and diffusion-controlled steps.

  11. Fluorescence quenching of newly synthesized biologically active coumarin derivative by aniline in binary solvent mixtures

    International Nuclear Information System (INIS)

    Evale, Basavaraj G.; Hanagodimath, S.M.

    2009-01-01

    The fluorescence quenching of newly synthesized coumarin (chromen-2-one) derivative, 4-(5-methyl-3-furan-2-yl-benzofuran-2-yl)-7-methyl-chromen-2-one (MFBMC) by aniline in different solvent mixtures of benzene and acetonitrile was determined at room temperature (296 K) by steady-state fluorescence measurements. The quenching is found to be appreciable and positive deviation from linearity was observed in the Stern-Volmer (S-V) plots in all the solvent mixtures. This could be explained by static and dynamic quenching models. The positive deviation in the S-V plot is interpreted in terms of ground-state complex formation model and sphere of action static quenching model. Various rate parameters for the fluorescence quenching process have been determined by using the modified Stern-Volmer equation. The sphere of action static quenching model agrees very well with experimental results. The dependence of Stern-Volmer constant K SV , on dielectric constant ε of the solvent mixture suggests that the fluorescence quenching is diffusion-limited. Further with the use of finite sink approximation model, it is concluded that these bimolecular quenching reactions are diffusion-limited. Using lifetime (τ o ) data, the distance parameter R' and mutual diffusion coefficient D are estimated independently.

  12. Enhancement of percutaneous penetration of aniline and o-toluidine in vitro using skin barrier creams.

    Science.gov (United States)

    Korinth, Gintautas; Lüersen, Lars; Schaller, Karl Heinz; Angerer, Jürgen; Drexler, Hans

    2008-04-01

    Aniline (ANI) and the human carcinogen o-toluidine (OT) are released at the workplace during the production and processing of rubber. Recently, we showed in rubber industry workers that a frequent use of skin barrier creams (SBC) increased the internal exposure of ANI and OT. In the present study, diffusion cells were used to investigate the effects of two SBC and one skin care cream (SCC) on percutaneous penetration of neat ANI and OT as well as of OT from a mixture with a workplace specific lubricant. The experiments were carried out with untreated and with skin creams treated human skin. A considerable percutaneous penetration enhancement of test compounds was observed for treated skin compared with untreated skin; the highest enhancement (mean factors 6.2-12.3) was found for SBC (based on oil in water emulsion) treated skin. The lowest penetration enhancement showed SCC treated skin (mean factors 4.2-9.7). The in vitro data support our findings in workers that the percutaneous absorption of aromatic amines significantly increases in presence of skin creams. The efficacy of skin creams to protect the percutaneous penetration of aromatic amines is not confirmed by our own experiments.

  13. Synthesis of biodegradable and electroactive multiblock polylactide and aniline pentamer copolymer for tissue engineering applications.

    Science.gov (United States)

    Huang, Lihong; Zhuang, Xiuli; Hu, Jun; Lang, Le; Zhang, Peibiao; Wang, Yu; Chen, Xuesi; Wei, Yen; Jing, Xiabin

    2008-03-01

    To obtain one biodegradable and electroactive polymer as the scaffold for tissue engineering, the multiblock copolymer PLAAP was designed and synthesized with the condensation polymerization of hydroxyl-capped poly( l-lactide) (PLA) and carboxyl-capped aniline pentamer (AP). The PLAAP copolymer exhibited excellent electroactivity, solubility, and biodegradability. At the same time, as one scaffold material, PLAAP copolymer possesses certain mechanical properties with the tensile strength of 3 MPa, tensile Young 's modulus of 32 MPa, and breaking elongation rate of 95%. We systematically studied the compatibility of PLAAP copolymer in vitro and proved that the electroactive PLAAP copolymer was innocuous, biocompatible, and helpful for the adhesion and proliferation of rat C6 cells. Moreover, the PLAAP copolymer stimulated by electrical signals was demonstrated as accelerating the differentiation of rat neuronal pheochromocytoma PC-12 cells. This biodegradable and electroactive PLAAP copolymer thus possessed the properties in favor of the long-time application in vivo as nerve repair scaffold materials in tissue engineering.

  14. Metabolic comparison of radiolabeled aniline- and phenol-phthaleins with 131I

    International Nuclear Information System (INIS)

    Avcibasi, Ugur; Avcibasi, Nesibe; Unak, Turan; Unak, Perihan; Mueftueler, Fazilet Zuemruet; Yildirim, Yeliz; Dincalp, Haluk; Guemueser, Fikriye Guel; Dursun, Ebru Rueksen

    2008-01-01

    The metabolic comparison of aniline- and phenol-phthaleins radiolabeled with 131 I ( 131 I-APH and 131 I-PPH, respectively) has been investigated in this study. To compare the metabolic behavior of these phthaleins and their glucuronide conjugates radiolabeled with 131 I, scintigraphic and biodistributional techniques were applied using male Albino rabbits. The results obtained have shown that these compounds were successfully radioiodinated with a radioiodination yield of about 100%. Maximum uptakes of 131 I-APH and 131 I-PPH, which were metabolized as N- and O-glucuronides, were observed within 2 h in the bladder and in the small intestine, respectively. In the case of verification of considerably up taking of these compounds also by tumors developed in the small intestine and in the bladder tissues, these results can be expected to be encouraging to test these compounds, which will be radiolabeled with other radioiodines such as 125 I, 123 I and 124 I as imaging and therapeutic agents in nuclear medical applications

  15. Metabolic comparison of radiolabeled aniline- and phenol-phthaleins with (131)I.

    Science.gov (United States)

    Avcibaşi, Uğur; Avcibaşi, Nesibe; Unak, Turan; Unak, Perihan; Müftüler, Fazilet Zümrüt; Yildirim, Yeliz; Dinçalp, Haluk; Gümüşer, Fikriye Gül; Dursun, Ebru Rükşen

    2008-05-01

    The metabolic comparison of aniline- and phenol-phthaleins radiolabeled with (131)I ((131)I-APH and (131)I-PPH, respectively) has been investigated in this study. To compare the metabolic behavior of these phthaleins and their glucuronide conjugates radiolabeled with (131)I, scintigraphic and biodistributional techniques were applied using male Albino rabbits. The results obtained have shown that these compounds were successfully radioiodinated with a radioiodination yield of about 100%. Maximum uptakes of (131)I-APH and (131)I-PPH, which were metabolized as N- and O-glucuronides, were observed within 2 h in the bladder and in the small intestine, respectively. In the case of verification of considerably up taking of these compounds also by tumors developed in the small intestine and in the bladder tissues, these results can be expected to be encouraging to test these compounds, which will be radiolabeled with other radioiodines such as (125)I, (123)I and (124)I as imaging and therapeutic agents in nuclear medical applications.

  16. Electropolymerization of poly (aniline-co-o-anisidine) on copper and its anticorrosion properties

    International Nuclear Information System (INIS)

    Ozyilmaz, A T

    2008-01-01

    Poly(aniline-co-o-anisidine) of copolymer coatings was synthesized on the copper surface (Cu) with two different amounts of p-toluenesulfonic acid (p-TSA) added to the aqueous sodium oxalate (NaOX) solution. The copper substrates in NaOX solutions containing p-TSA acid had a fairly reliable passive surface mainly due to the formation of copper (II) oxalate layer. The addition of p-TSA acid to the working electrolyte contributed to both the amount of copolymer deposition (growth) and that of copolymer coated per unit time of electropolymerization (growth rate). The growth of copolymer coating on Cu electrode was characterized by scanning electron microscopy. The corrosion performances of copolymer coatings were investigated in 3.5% NaCl solution with anodic polarization curves and electrochemical impedance spectroscopy. The results showed that p-TSA acid led to the diminishing of the permeability of the copolymer films. The copolymer coatings exhibited an effective barrier property on copper electrode and a remarkable anodic protection to substrate for longer exposure time

  17. Corrosion Protection of Carbon Steel Using Poly aniline Composite with Inorganic Pigments

    International Nuclear Information System (INIS)

    Al-Dulaimi, A.A.; Shahrir Hashim; Khan, M.I.

    2011-01-01

    Two inorganic pigments (TiO 2 and SiO 2 ) were used to prepare composites with poly aniline (PANI) by situ polymerization method. PANI and PANI composites with SiO 2 and TiO 2 were characterized using Fourier transform infrared spectroscopy and X-ray diffraction. The morphology of the synthesized pigments (PANI , PANI-SiO 2 and PANI-TiO 2 ) was examined using scanning electron microscopy. Samples were then used as pigments through blending them with acrylic paint and applied on the surface of carbon steel panels. Corrosion was evaluated for coating of carbon steel panels through full immersion test up to standard ASTMG 31. Mass loss was calculated after they have been exposed in acidic media. A digital camera was also used for monitoring corrosion visually on the surface of carbon steel specimens. The results revealed that acrylic paint pigmented by PANI-SiO 2 composite was more efficient in corrosion protection for carbon steel compared with the other synthesized pigments. (author)

  18. Ionic liquid – Assisted emulsion polymerization of aniline in organic medium

    Energy Technology Data Exchange (ETDEWEB)

    Calheiros, Loan F. [Universidade Federal do Rio de Janeiro, Instituto de Macromoléculas, 21941-598, Rio de Janeiro (Brazil); Soares, Bluma G., E-mail: bluma@metalmat.ufrj.br [Universidade Federal do Rio de Janeiro, PEMM-COPPE, Centro de Tecnologia, 21941-972, Rio de Janeiro (Brazil); Universidade Federal do Rio de Janeiro, Instituto de Macromoléculas, 21941-598, Rio de Janeiro (Brazil); Barra, Guilherme M.O. [Universidade Federal de Santa Catarina, Mechanical Engineering Department, Florianópolis, SC (Brazil); Livi, Sébastien [Université de Lyon, F-69003, Lyon (France); INSA Lyon, F-69621, Villeurbanne (France); CNRS, UMR 5223, Ingénierie des Matériaux Polymères (France)

    2016-08-15

    Polyaniline doped with dodecylbenzene sulfonic acid (PAni.DBSA) with different conductivities and morphologies was prepared by inverted emulsion polymerization, in toluene using ammonium peroxydisulfate as the oxidizing agent, in the presence of two different imidazolium – based ionic liquids, such as, 1-methyl-3-butyl imidazolium tetrafluorate (bmim.BF{sub 4}) and 1-(11-carboxyundecyl)-3-methylimidazolium bromide (mimC{sub 10}COOH.Br). The influence of ionic liquid on the morphology and particle size of formed PAni.DBSA samples was investigated by field emission - scanning electron microscopy (FEG-SEM) and dynamic light scattering (DLS) measurements. Ultraviolet–visible measurements were also employed to confirm the structure of the conducting polymer. PAni.DBSA samples were also characterized by thermogravimetric analysis, cyclic voltammetry and X-ray photoelectron spectroscopy (XPS). PAni.DBSA samples prepared in the presence of ionic liquids have shown improved dispersability in epoxy resin as indicated by optical micrograph. - Highlights: • Imidazolium-based ionic liquids as soft templates for polyaniline synthesis. • PAni with higher conductivity and different morphologies was achieved in the presence of IL. • Good IL/aniline salt interaction resulted in confinement inside PAni particles. • IL confinement confirmed by TGA and XPS analyses. • Excellent dispersability of PAni. DBSA prepared with ionic liquids, in epoxy matrix.

  19. Enzymatic polymerization of aniline in the presence of different inorganic substrates

    Energy Technology Data Exchange (ETDEWEB)

    Flores-Loyola, E. [Centro de Investigacion en Quimica Aplicada, Blvd. Enrique Reyna No. 140, CP 25100 Saltillo, Coah (Mexico); Escuela de Ciencias Biologicas, UA de C. Carr. Torreon-Matamoros Km 7.5, Ciudad Universitaria, CP 27400 Torreon, Coah. (Mexico)], E-mail: erika-flores@mail.uadec.mx; Cruz-Silva, R. [Centro de Investigacion en Ingenieria y Ciencias Aplicadas, UAEM. Av. Universidad 1001, Col. Chamilpa, CP 62210, Cuernavaca Mor. (Mexico); Romero-Garcia, J.; Angulo-Sanchez, J.L. [Centro de Investigacion en Quimica Aplicada, Blvd. Enrique Reyna No. 140, CP 25100 Saltillo, Coah (Mexico); Castillon, F.F.; Farias, M.H. [Centro de Ciencias de la Materia Condensada de la UNAM, Apdo. Postal 2681, CP 22800 Ensenada, B.C. (Mexico)

    2007-09-15

    The effect of different inorganic substrates in the structure of polyaniline synthesized by enzymatic oxidation was studied. The polymer characterization was done by electronic absorption and X-ray photoelectron spectroscopy. The substrates studied were: controlled pore glass, mordenite, zeolite Y, zeolite MCM-41, Wollastonite, silica gel, fuming silica and short glass fibers type E. Polyaniline was synthesized in the presence of the substrates under acidic aqueous conditions, using hydrogen peroxide as oxidizer and HRP or SBP enzymes as catalyst. The composition of the substrates strongly affected the degree of electronic conjugation of the synthesized polyaniline, whereas the pore size and the enzyme type apparently had no effect. The chemical structure of polyaniline enzymatically synthesized was more sensitive to the substrate composition than that chemically synthesized. Apparently substrates containing alkaline ions, such as sodium and calcium, promoted the formation of the branched, non-conductive polyaniline form. The effect of the substrates on the polyaniline structure can be explained considering the local pH effect of the templates surface on the coupling reaction of aniline radicals.

  20. Evaluation of the aniline chemical oxidation process using multiple simultaneous electrochemical responses

    International Nuclear Information System (INIS)

    Cristovan, Fernando H.; Lemos, Sherlan G.; Santos, Janaina S.; Trivinho-Strixino, Francisco; Pereira, Ernesto C.; Mattoso, Luiz H.C.; Kulkarni, Rashmi; Manohar, Sanjeev K.

    2010-01-01

    In this paper we show the simultaneous evaluation of the electrochemical impedance, the open circuit potential and the mass variation of the polyaniline deposited on a metal substrate during chemical oxidation of aniline. We detected that the final properties of the polymer could be practically defined after the inflection point of the potential profile. Considering a series connection of R and C, impedance Z was decomposed into the resistive and capacitive components. The resistivity and permittivity show a slight change after the inflection point in the potential profile. Impedance data and mass changes during synthesis also contributed to a better definition of the induction period. We described the system as whole, which relates to an electronic transport and to an electronic charge storage process. Although very simple, this model helps us to interpret and correlate different techniques to explain the results. In addition, we demonstrated that the in situ evaluation of the parameters described above offers new insights on the chemical synthesis mechanism of polyaniline.

  1. Liquid chromatographic determination of aniline and derivatives in environmental waters at nanogram per litre levels using fluorescamine pre-column derivatization

    Energy Technology Data Exchange (ETDEWEB)

    Djozan, D. [Univ. of Tabriz (Iran, Islamic Republic of). Dept. of Analytical Chemistry; Faraj-Zadeh, M.A. [Univ. of Tabriz (Iran, Islamic Republic of). Dept. of Analytical Chemistry

    1995-11-01

    Fluorescamine (fluram) has been used as a fluorogenic compound for pre-column derivatization of aniline and some derivatives. Anilines were derivatized with fluram in citrate buffer media (pH 5.5) to form pyrrolinones. The highly fluorescence pyrrolinones were isolated and pre-concentrated by solid phase extraction. A reversed phase, Spherisorb RP-8 column and tetrahydrofuran: Water:formic acid (42:56:2) mobile phase was used for separation. Detection method was by a sensitive fluorimetric method and quantitation was at 395 and 495 nm. The various parameters such as reaction conditions between anilines and fluram, solid phase extraction and chromatographic separation were optimized. Calibrations were linear over the range considered with excellent correlation coefficients (r>0.999). Relative standard deviations are less than 2.5% and detection limits for aniline, p-toluidine, 4-chloroaniline and 4-bromoaniline were 6, 30, 6 and 8 ng L{sup -1}, respectively. This method has been used successfully for the determination of anilines in environmental waters. (orig.)

  2. Luminescent Fluorene-Based Bis-Pyrazolyl Aniline Ligand for Aluminum Detection.

    Science.gov (United States)

    Frazer, Andrew; Morales, Alma R; Woodward, Adam W; Tongwa, Paul; Timofeeva, Tatiana; Belfield, Kevin D

    2013-09-29

    The design, synthesis, and photophysical properties of a new fluorene-based fluorescent chemosensor, 4-((E)-2-(2-(benzo[d]thiazol-2-yl)-9,9-diethyl-9H-fluoren-7-yl)vinyl)-N,N-bis((3,5-dimethyl-1H-pyrazol-1-yl)methyl)benzenamine (AXF-Al), is described for the detection of Al 3+ . AXF-Al exhibited absorption at 382 nm and strong fluorescence emission at 542 nm (fluorescence quantum yield, Φ F , of 0.80). The capture of Al 3+ by the pyrazolyl aniline receptor resulted in nominal change in the linear absorption (372 nm) but a large hypsochromic shift of 161 nm in the fluorescence spectrum (542 to 433 nm, Φ F  = 0.88), from which Al 3+ was detected both ratiometrically and colorimetrically. The addition of other metal ions, namely Mg 2+ , Ca 2+ , Mn 2+ , Fe 2+ , Co 2+ , Ni 2+ , Cu 2+ , Zn 2+ , Cd 2+ , Hg 2+ and Pb 2+ , produced only minimal changes in the optical properties of this probe. The emission band of this probe was also accessed by two-photon excitation in the near-IR, as two-photon absorption (2PA) is important for potential applications in two-photon fluorescence microscopy (2PFM) imaging. The 2PA cross section of the free fluorenyl ligand AXF-Al was 220 GM at 810 nm and 235 GM at 810 nm for the Al-ligand complex, practically useful properties for 2PFM.

  3. Spectroscopic evidence for intermediate species formed during aniline polymerization and polyaniline degradation.

    Science.gov (United States)

    Planes, G A; Rodríguez, J L; Miras, M C; García, G; Pastor, E; Barbero, C A

    2010-09-21

    Spectroscopic methods are used to investigate the formation of low molecular mass intermediates during aniline (ANI) oxidation and polyaniline (PANI) degradation. Studying ANI anodic oxidation by in situ Fourier transform infrared spectroscopy (FTIRS) it is possible to obtain, for the first time, spectroscopic evidence for ANI dimers produced by head-to-tail (4-aminodiphenylamine, 4ADA) and tail-to-tail (benzidine, BZ) coupling of ANI cation radicals. The 4ADA dimer is adsorbed on the electrode surface during polymerization, as proved by cyclic voltammetry of thin PANI films and its infrared spectrum. This method also allows, with the help of computational simulations, to assign characteristic vibration frequencies for the different oxidation states of PANI. The presence of 4ADA retained inside thin polymer layers is established too. On the other hand, FTIRS demonstrates that the electrochemically promoted degradation of PANI renders p-benzoquinone as its main product. This compound, retained inside the film, is apparent in the cyclic voltammogram in the same potential region previously observed for 4ADA dimer. Therefore, applying in situ FTIRS is possible to distinguish between different chemical species (4ADA or p-benzoquinone) which give rise to voltammetric peaks in the same potential region. Indophenol and CO(2) are also detected by FTIRS during ANI oxidation and polymer degradation. The formation of CO(2) during degradation is confirmed by differential electrochemical mass spectroscopy. To the best of our knowledge, this is the first evidence of the oxidation of a conducting polymer to CO(2) by electrochemical means. The relevance of the production of different intermediate species towards PANI fabrication and applications is discussed.

  4. Prenatal exposure to paracetamol/acetaminophen and precursor aniline impairs masculinisation of male brain and behaviour.

    Science.gov (United States)

    Hay-Schmidt, Anders; Finkielman, Olivia T Ejlstrup; Jensen, Benjamin A H; Høgsbro, Christine F; Bak Holm, Jacob; Johansen, Kristoffer Haurum; Jensen, Tina Kold; Andrade, Anderson Martino; Swan, Shanna H; Bornehag, Carl-Gustaf; Brunak, Søren; Jegou, Bernard; Kristiansen, Karsten; Kristensen, David Møbjerg

    2017-08-01

    Paracetamol/acetaminophen (N-Acetyl-p-Aminophenol; APAP) is the preferred analgesic for pain relief and fever during pregnancy. It has therefore caused concern that several studies have reported that prenatal exposure to APAP results in developmental alterations in both the reproductive tract and the brain. Genitals and nervous system of male mammals are actively masculinised during foetal development and early postnatal life by the combined actions of prostaglandins and androgens, resulting in the male-typical reproductive behaviour seen in adulthood. Both androgens and prostaglandins are known to be inhibited by APAP. Through intrauterine exposure experiments in C57BL/6 mice, we found that exposure to APAP decreased neuronal number in the sexually dimorphic nucleus (SDN) of the preoptic area (POA) in the anterior hypothalamus of male adult offspring. Likewise, exposure to the environmental pollutant and precursor of APAP, aniline, resulted in a similar reduction. Decrease in neuronal number in the SDN-POA is associated with reductions in male sexual behaviour. Consistent with the changes, male mice exposed in uteri to APAP exhibited changes in urinary marking behaviour as adults and had a less aggressive territorial display towards intruders of the same gender. Additionally, exposed males had reduced intromissions and ejaculations during mating with females in oestrus. Together, these data suggest that prenatal exposure to APAP may impair male sexual behaviour in adulthood by disrupting the sexual neurobehavioral programming. These findings add to the growing body of evidence suggesting the need to limit the widespread exposure and use of APAP by pregnant women. © 2017 Society for Reproduction and Fertility.

  5. Transition metal doped poly(aniline-co-pyrrole)/multi-walled carbon nanotubes nanocomposite for high performance supercapacitor electrode materials

    International Nuclear Information System (INIS)

    Dhibar, Saptarshi; Bhattacharya, Pallab; Hatui, Goutam; Das, C.K.

    2015-01-01

    Highlights: • The CuCl 2 doped copolymer (PANI and PPy)/MWCNTs nanocomposite was prepared. • The nanocomposite achieved highest specific capacitance of 383 F/g at a 0.5 A/g. • Nanocomposite exhibits better energy density as well as power density. • The nanocomposite also showed better electrical conductivity at room temperature. • The nanocomposite can be used as promising electrode materials for supercapacitor. - Abstract: In this present communication, copolymer of polyaniline (PANI) and polypyrrole (PPy) that is poly(aniline-co-pyrrole) [poly(An-co-Py)], copper chloride (CuCl 2 ) doped poly(aniline-co-pyrrole) [poly(An-co-Py) Cu], and CuCl 2 doped poly(aniline-co-pyrrole)/multi walled carbon nanotubes (MWCNTs) [poly(An-co-Py) Cu CNT] nanocomposite have been prepared by a simple and inexpensive in-situ chemical oxidative polymerization method, using ammonium persulfate (APS) as oxidant and hydrochloric acid (HCl) as dopant and investigated as high performance supercapacitor electrode materials. The possible interaction between CuCl 2 with copolymers and MWCNTs was investigated by Fourier transform infrared spectroscopy (FTIR) and UV–visible spectroscopy analysis. The morphological characteristic of all the electrode materials were analyzed by Field emission scanning electron microscopy (FESEM) and Transmission electron microscopy (TEM) study. The electrochemical characterizations of all the electrode materials were carried out by three electrode probe method where, standard calomel electrode and platinum were used as reference and counter electrodes, respectively. Among all the electrode materials, poly(An-co-Py) Cu CNT nanocomposite achieved highest specific capacitance value of 383 F/g at 0.5 A/g scan rate. The nanocomposite showed better electrical conductivity at room temperature and also attained nonlinear current–voltage characteristic. Based on the superior electrochemical as well as other properties the as prepared nanocomposite can be used

  6. A novel magnetic poly(aniline-naphthylamine)-based nanocomposite for micro solid phase extraction of rhodamine B

    International Nuclear Information System (INIS)

    Bagheri, Habib; Daliri, Rasoul; Roostaie, Ali

    2013-01-01

    Graphical abstract: -- Highlights: •A Fe 3 O 4 –aniline-naphthylamine nanocomposite was prepared via a simple route. •The magnetic nanocomposite was applied for isolation of RhB from water. •The nanocomposite applicability was compared with other pristine polymers. •The method was applied for the determination of RhB in different samples. -- Abstract: A novel Fe 3 O 4 –poly(aniline-naphthylamine)-based nanocomposite was synthesized by chemical oxidative polymerization process as a magnetic sorbent for micro solid phase extraction. The scanning electron microscopy images of the synthesized nanocomposite revealed that the copolymer posses a porous structure with diameters less than 50 nm. The extraction efficiency of this sorbent was examined by isolation of rhodamine B, a mutagenic and carcinogenic dye, from aquatic media in dispersion mode. Among different synthesized polymers, Fe 3 O 4 /poly(aniline-naphthylamine) nanocomposite showed a prominent efficiency. Parameters including the desorption solvent, amount of sorbent, desorption time, sample pH, ionic strength, extraction time and stirring rate were optimized. Under the optimum condition, a linear spiked calibration curve in the range of 0.35–5.00 μg L −1 with R 2 = 0.9991 was obtained. The limits of detection (3S b ) and limits of quantification (10S b ) of the method were 0.10 μg L −1 and 0.35 μg L −1 (n = 3), respectively. The relative standard deviation for water sample with 0.5 μg L −1 of RhB was 4.2% (n = 5) and the absolute recovery was 92%. The method was applied for the determination of rhodamine B in dishwashing foam, dishwashing liquid, shampoo, pencil, matches tips and eye shadows samples and the relative recovery percentage were in the range of 94–99%

  7. Transition metal doped poly(aniline-co-pyrrole)/multi-walled carbon nanotubes nanocomposite for high performance supercapacitor electrode materials

    Energy Technology Data Exchange (ETDEWEB)

    Dhibar, Saptarshi; Bhattacharya, Pallab; Hatui, Goutam; Das, C.K., E-mail: chapal12@yahoo.co.in

    2015-03-15

    Highlights: • The CuCl{sub 2} doped copolymer (PANI and PPy)/MWCNTs nanocomposite was prepared. • The nanocomposite achieved highest specific capacitance of 383 F/g at a 0.5 A/g. • Nanocomposite exhibits better energy density as well as power density. • The nanocomposite also showed better electrical conductivity at room temperature. • The nanocomposite can be used as promising electrode materials for supercapacitor. - Abstract: In this present communication, copolymer of polyaniline (PANI) and polypyrrole (PPy) that is poly(aniline-co-pyrrole) [poly(An-co-Py)], copper chloride (CuCl{sub 2}) doped poly(aniline-co-pyrrole) [poly(An-co-Py) Cu], and CuCl{sub 2} doped poly(aniline-co-pyrrole)/multi walled carbon nanotubes (MWCNTs) [poly(An-co-Py) Cu CNT] nanocomposite have been prepared by a simple and inexpensive in-situ chemical oxidative polymerization method, using ammonium persulfate (APS) as oxidant and hydrochloric acid (HCl) as dopant and investigated as high performance supercapacitor electrode materials. The possible interaction between CuCl{sub 2} with copolymers and MWCNTs was investigated by Fourier transform infrared spectroscopy (FTIR) and UV–visible spectroscopy analysis. The morphological characteristic of all the electrode materials were analyzed by Field emission scanning electron microscopy (FESEM) and Transmission electron microscopy (TEM) study. The electrochemical characterizations of all the electrode materials were carried out by three electrode probe method where, standard calomel electrode and platinum were used as reference and counter electrodes, respectively. Among all the electrode materials, poly(An-co-Py) Cu CNT nanocomposite achieved highest specific capacitance value of 383 F/g at 0.5 A/g scan rate. The nanocomposite showed better electrical conductivity at room temperature and also attained nonlinear current–voltage characteristic. Based on the superior electrochemical as well as other properties the as prepared

  8. Photocatalytic degradation of aniline using an autonomous rotating drum reactor with both solar and UV-C artificial radiation.

    Science.gov (United States)

    Durán, A; Monteagudo, J M; San Martín, I; Merino, S

    2018-03-15

    The aim of this work was to evaluate the performance of a novel self-autonomous reactor technology (capable of working with solar irradiation and artificial UV light) for water treatment using aniline as model compound. This new reactor design overcomes the problems of the external mass transfer effect and the accessibility to photons occurring in traditional reaction systems. The UV-light source is located inside the rotating quartz drums (where TiO 2 is immobilized), allowing light to easily reach the water and the TiO 2 surface. Several processes (UV, H 2 O 2 , Solar, TiO 2 , Solar/TiO 2 , Solar/TiO 2 /H 2 O 2 and UV/Solar/H 2 O 2 /TiO 2 ) were tested. The synergy between Solar/H 2 O 2 and Solar/TiO 2 processes was quantified to be 40.3% using the pseudo-first-order degradation rate. The apparent photonic efficiency, ζ, was also determined for evaluating light utilization. For the Solar/TiO 2 /H 2 O 2 process, the efficiency was found to be practically constant (0.638-0.681%) when the film thickness is in the range of 1.67-3.87 μm. However, the efficiency increases up to 2.67% when artificial UV light was used in combination, confirming the efficient design of this installation. Thus, if needed, lamps can be switched on during cloudy days to improve the degradation rate of aniline and its mineralization. Under the optimal conditions selected for the Solar/TiO 2 /H 2 O 2 process ([H 2 O 2 ] = 250 mg/L; pH = 4, [TiO 2 ] = 0.65-1.25 mg/cm 2 ), 89.6% of aniline is degraded in 120 min. If the lamps are switched on, aniline is completely degraded in 10 min, reaching 85% of mineralization in 120 min. TiO 2 was re-used during 5 reaction cycles without apparent loss in activity (Solar/TiO 2 /H 2 O 2 process was found to have lower operation costs than other systems described in literature (0.67 €/m 3 ). Copyright © 2018 Elsevier Ltd. All rights reserved.

  9. An electron conductive polymer, poly-aniline, in gas separation: optimisation of transport properties by alternated acid-base treatment

    International Nuclear Information System (INIS)

    Rebattet, Laurence

    1994-01-01

    The objective of this research thesis is to study the variation of gas permeation properties of poly-aniline during a doping/de-doping/re-doping cycle, and to study the evolution of the separation power of this polymer. Scanning electronic microscopy is used to study the microstructure and more particularly how the doping agent is distributed within the polymer. Permeabilities, diffusion coefficients, sorption solubilities and interaction energies are measured by using coupled permeation and micro-gravimetry-calorimetry methods. A range of gases (H 2 , O 2 , CO 2 , N 2 , CH 4 ) is analysed [fr

  10. Palladium-Catalyzed ortho C-H Arylation of Benzaldehydes Using ortho-Sulfinyl Aniline Transient Auxiliary.

    Science.gov (United States)

    Mu, Delong; He, Gang; Chen, Gong

    2018-05-03

    A PdII-catalyzed ortho-(Csp2)-H arylation reaction of benzaldehydes using catalytic amount of 2-methylsulfinyl-aniline as transient auxiliary was developed. This reaction is compatible with a broad range of benzaldehyde and aryl iodide substrates. Compared with other related reaction systems, an excellent regioselectivity for ortho-C(sp2)-H bonds over benzylic C(sp3)-H bonds was obtained for ortho-alkyl-benzaldehyde substrates. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  11. Iridium- and ruthenium-catalysed synthesis of 2,3-disubstituted indoles from anilines and vicinal diols

    DEFF Research Database (Denmark)

    Tursky, Matyas; Lorentz-Petersen, Linda Luise Reeh; Olsen, L. B.

    2010-01-01

    A straightforward and atom-economical method is described for the synthesis of 2,3-disubstituted indoles. Anilines and 1,2-diols are condensed under neat conditions with catalytic amounts of either [Cp*IrCl2](2)/MsOH or RuCl3 center dot xH(2)O/phosphine (phosphine = PPh3 or xantphos). The reactio...... the alpha-hydroxyimine which rearranges to the corresponding alpha-aminoketone. Acid-or metal-catalysed electrophilic ring-closure with the release of water then furnishes the indole product....

  12. Session 6: Water depollution from aniline and phenol by air oxidation and adsorptive-catalytic oxidation in liquid phase

    Energy Technology Data Exchange (ETDEWEB)

    Dobrynkin, N.M.; Batygina, M.V.; Noskov, A.S. [Boreskov Institute of Catalysis of Siberian Branch of Russian Academy of Sciences, Pr. Ak. Lavrentieva (Russian Federation)

    2004-07-01

    This paper is devoted to development of carbon catalysts and application of catalytic wet air oxidation for deep cleaning of polluted waters. The described catalysts and method are solving the problem of development environmentally reliable method for fluids treatment and allow carrying out the adsorption of pollutants on carbon CAPM (catalytically active porous material) with following regeneration of the CAPM without the loss of adsorptive qualities. The experiments have shown a principal capability simultaneously to use carbon CAPM as adsorbent and either as catalyst, or as a catalyst support for oxidation of aniline and phenol in water solutions. (authors)

  13. Facile and Sensitive Spectrophotometric Technique for the Determination of Carbofuran in its Formulations, Water and Grain Samples with Substituted Anilines

    Directory of Open Access Journals (Sweden)

    V. Harikishna

    2005-01-01

    Full Text Available Methods are described for the determination of carbofuran in its formulations, in water and grain samples by the diazotization coupling spectrophotometric technique, using substituted anilines such as 4-bromoaniline, 4-methylaniline and 4-aminobenzaldehyde as the coupling agents. The orange red colour formed with 4-bromoaniline shows maximum absorption at 478 nm, yellow colour obtained with 4-methylaniline have maximum absorption at 465 nm whereas a red colour derivative formed with 4-aminobenzaldehyde shows λmax at 472 nm. The methods could be successfully applied for the determination of carbofuran in its formulations, water and grain samples.

  14. The electrochemical synthesis and corrosion behaviour of TiO2/poly(indole-co-aniline multilayer coating: Experimental and theoretical approach

    Directory of Open Access Journals (Sweden)

    Serap Toprak Döşlü

    2018-01-01

    Full Text Available The aim of this study was to protect stainless steel against corrosion via poly (indole-co-aniline with the help of titanium dioxide pre-coating. Different monomer ratios (1:1 and 1:9 were applied in order to determine the suitable chain composition to synthesize the copolymer in lithium perchlorate containing acetonitrile. The structures, morphologies, electrochemical properties and corrosion resistances of the mono and multi-layer coatings were investigated by Fourier-transform infrared spectra, scanning electron microscope, energy dispersive X-ray spectrometer, electrochemical impedance spectroscopy and anodic polarization. Furthermore the geometric structure and electronic properties of indole, aniline, and indole-co-aniline (dimmer molecules have been investigated by quantum calculations. The results indicated that corrosion protection of copolymers was increased via titanium dioxide pre-coating. The 1:1 copolymer coating showed better corrosion prevention than 1:9 coating. The correlation was determined between experimental and theoretical parameters.

  15. Disposition and metabolism of aniline in Fischer 344 rats and C57BL/6 X C3H F1 mice

    International Nuclear Information System (INIS)

    McCarthy, D.J.; Waud, W.R.; Struck, R.F.; Hill, D.L.

    1985-01-01

    We examined the metabolism and disposition of aniline, which induces spleen hemangiosarcomas in rats but no tumors in mice, in normal and predosed Fischer 344 rats, and C57BL/6 X C3H F1 mice administered low (50 and 100 mg/kg, respectively) or high (250 and 500 mg/kg, respectively) doses. Of 11 tissues examined, the highest levels of binding of [ 14 C]aniline to DNA were in the kidney, large intestine, and spleen of high-dose rats that had received prior dosing; these tissues had covalent binding indices of 14.2, 4.3, and 3.7 mumol/mol nucleotides/dose, respectively. Protein and RNA were the major macromolecular targets for binding of radioactivity from [ 14 C]aniline. Relative to controls, most tissues from predosed mice (low dose and high dose) showed less binding to protein and RNA; but for most tissues from predosed rats administered 50-mg/kg doses of [ 14 C]aniline, there was more extensive binding. Also relative to controls, binding of radioactivity in the spleen of predosed rats given [ 14 C]aniline (50 mg/kg) was 148% greater for protein and 302% greater for RNA. For rats administered 250 mg of [ 14 C]aniline per kg, however, there were no outstanding differences in binding to RNA and protein between normal and predosed animals. The profiles of urinary metabolites produced by rats and mice were not appreciably different in animals predosed with aniline. For rats, however, the profiles were different for the low and high doses, suggesting that the main metabolic pathway was saturated at the higher dose. p-Acetamidophenyl sulfate represented over 70% of the total radioactivity recovered from the urine of rats dosed with 50 mg of aniline per kg but only 30% in the urine of those dosed with 250 mg/kg. The urine of the high-dose rats contained greater percentages of p-aminophenyl sulfate, p-acetamidophenyl glucuronide, and unconjugated metabolites

  16. Structure and spectroscopic properties of N,S-coordinating 2-methyl-sulfanyl-N-[(1H-pyrrol-2-yl)methyl-idene]aniline methanol monosolvate.

    Science.gov (United States)

    Richards, D Douglas; Ang, M Trisha C; McDonald, Robert; Bierenstiel, Matthias

    2015-10-01

    The reaction of pyrrole-2-carboxaldehyde and 2-(methyl-sulfan-yl)aniline in refluxing methanol gave an olive-green residue in which yellow crystals of the title compound, C12H12N2S·CH3OH, were grown from slow evaporation of methanol at 263 K. In the crystal, hydrogen-bonding inter-actions link the aniline mol-ecule and a nearby methanol solvent mol-ecule. These units are linked by a pair of weak C-H⋯Omethanol interactions, forming inversion dimers consisting of two main molecules and two solvent molecules.

  17. Study of aniline polymerization reactions through the particle size formation in acidic and neutral medium

    Science.gov (United States)

    Aribowo, Slamet; Hafizah, Mas Ayu Elita; Manaf, Azwar; Andreas

    2018-04-01

    In the present paper, we reported particle size kinetic studies on the conducting polyaniline (PANI) which synthesized through a chemical oxidative polymerization technique from aniline monomer. PANI was prepared using ammonium persulfate (APS) as oxidizing agent which carried out in acidic and neutral medium at various batch temperatures of respectively 20, 30 and 50 °C. From the studies, it was noticed that the complete polymerization reaction progressed within 480 minutes duration time. The pH of the solution during reaction kinetic reached values 0.8 - to 1.2 in acidic media, while in the neutral media the pH value reached values 3.8 - 4.9. The batch temperature controlled the polymerization reaction in which the reaction progressing, which followed by the temperature rise of solution above the batch temperature before settled down to the initial temperature. An increment in the batch temperature gave highest rise in the solution temperature for the two media which cannot be more than 50 °C. The final product of polymerization reaction was PANI confirmed by Fourier Transform Infra-Red (FTIR) spectrophotometer for molecule structure identification. The averages particle size of PANI which carried out in the two different media is evidently similar in the range 30 - 40 μm and insensitive to the batch temperature. However, the particle size of PANI which obtained from the polymerization reaction at a batch temperature of 50 °C under acidic condition reached ˜53.1 μm at the tip of the propagation stage which started in the first 5 minutes. The size is obviously being the largest among the batch temperatures. Whereas, under neutral condition the particle size is much larger which reached the size 135 μm at the batch temperature of 20 °C. It is concluded that the particle size formation during the polymerization reaction being one of the important parameter to determine particle growing of polymer which indicated the reaction kinetics mechanism of synthesize

  18. N,N-Dihexyl-4-[2-(4-nitrophenylvinyl]aniline

    Directory of Open Access Journals (Sweden)

    Dieter Schollmeyer

    2011-06-01

    Full Text Available The title compound, C26H36N2O2, was prepared by Horner olefination of p-dihexylaminobenzaldehyde and diethyl p-nitrobenzylphosphonate. It crystallizes with two independent molecules in the asymmetric unit. Both have similar geometries of the π-systems but the conformations of all hexyl chains are different. Whereas one hexyl chain of the first molecule shows the typical all-anti conformation, the second is arranged in a gauche-anti-gauche-anti conformation with N—C—C—C, C—C—C—C, C—C—C—C and C—C—C—C torsion angles of −65.1 (4, 167.3 (3, 63.3 (4, and 179.4 (3°. One of the hexyl chains in the other molecule has an anti-anti-gauche-anti conformation [N—C—C—C, C—C—C—C, C—C—C—C and C—C—C—C torsion angles = 179.6 (3, −179.8 (3, −68.7 (5 and −178.8 (4°], the other starts with an anti-gauche-gauche sequence. Molecules A and B are composed of five planar subunits. The angle sums around the N atoms are in the range 356 (2–360.0 (2°. Torsion angles between these segments do not exceed 4.9 (4°, except for one of the alkyl chains each [molecule A = 26.2 (4°; molecule B = −6.0 (4°]. The high planarity of the molecules and the short aniline C—N bonds [1.385 (3 Å in molecule A and 1.378 (3 Å in molecule B] indicate a strong electronic coupling through the stilbene unit. One methylene group is disordered over two positions with an occupancy ratio of 0.72:0.28.

  19. Rapid and direct spectrophotometric method for kinetics studies and routine assay of peroxidase based on aniline diazo substrates.

    Science.gov (United States)

    Mirazizi, Fatemeh; Bahrami, Azita; Haghbeen, Kamahldin; Shahbani Zahiri, Hossein; Bakavoli, Mehdi; Legge, Raymond L

    2016-12-01

    Peroxidases are ubiquitous enzymes that play an important role in living organisms. Current spectrophotometrically based peroxidase assay methods are based on the production of chromophoric substances at the end of the enzymatic reaction. The ambiguity regarding the formation and identity of the final chromophoric product and its possible reactions with other molecules have raised concerns about the accuracy of these methods. This can be of serious concern in inhibition studies. A novel spectrophotometric assay for peroxidase, based on direct measurement of a soluble aniline diazo substrate, is introduced. In addition to the routine assays, this method can be used in comprehensive kinetics studies. 4-[(4-Sulfophenyl)azo]aniline (λmax = 390 nm, ɛ = 32 880 M(-1) cm(-1) at pH 4.5 to 9) was introduced for routine assay of peroxidase. This compound is commercially available and is indexed as a food dye. Using this method, a detection limit of 0.05 nmol mL(-1) was achieved for peroxidase.

  20. Optical, structural and electrochromic behavior studies on nanocomposite thin film of aniline, o-toluidine and WO3

    Science.gov (United States)

    Najafi-Ashtiani, Hamed; Bahari, Ali

    2016-08-01

    In the field of materials for electrochromic (EC) applications much attention was paid to the derivatives of aniline. We report on the optical, structural and electrochromic properties of electrochromic thin film based on composite of WO3 nanoparticles and copolymer of aniline and o-toluidine prepared by electrochemical polymerization method on fluorine doped tin oxide (FTO) coated glass. The thin film was studied by X-ray diffraction (XRD) and Fourier transforms infrared (FTIR) spectroscopy. The morphology of prepared thin film was characterized by field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM) and the thermal gravimetric analysis (TGA) as well. The optical spectra of nanocomposite thin film were characterized in the 200-900 nm wavelength range and EC properties of nanocomposite thin film were studied by cyclic voltammetry (CV). The calculation of optical band gaps of thin film exhibited that the thin film has directly allowed transition with the values of 2.63 eV on first region and 3.80 eV on second region. Dispersion parameters were calculated based on the single oscillator model. Finally, important parameters such as dispersion energy, oscillator energy and lattice dielectric constant were determined and compared with the data from other researchers. The nonlinear optical properties such as nonlinear optical susceptibility, nonlinear absorption coefficient and nonlinear refractive index were extracted. The obtained results of nanocomposite thin film can be useful for the optoelectronic applications.

  1. A facile synthesis of poly(aniline-co-o-bromoaniline) copolymer: Characterization and application as semiconducting material

    Science.gov (United States)

    Mahudeswaran, A.; Vivekanandan, J.; Vijayanand, P. S.; Kojima, T.; Kato, S.

    2016-01-01

    Poly(aniline-co-o-bromoaniline) (p(an-co-o-BrAn)) copolymer has been synthesized using chemical oxidation method in the hydrochloric acid medium. Copolymerization of aniline with o-bromoaniline of different compositions, such as 1:1, 1:2, 2:1, 1:3 and 3:1 molar ratios were prepared. The synthesized copolymer is soluble in polar solvents like dimethyl sulphoxide (DMSO), dimethyl formamide (DMF), Tetrahydrofuran (THF) and 1-methyl 2-pyrrolidone (NMP). The copolymer is analyzed by various characterization techniques, such as FTIR, UV-Visible (UV-Vis) spectroscopy, X-ray diffraction (XRD), conductivity, Differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). FTIR spectrum confirms the characteristic peaks of the copolymer containing benzenoid and quinoid ring stretching. UV spectrum reveals the formation of π-π∗ transition and n-π∗ transition between the energy levels. XRD peaks reveal that the copolymer possesses amorphous nature. Morphological study reveals that the agglomerated particles form globular structure and size of the each particle is about 100 nm. The electrical conductivity of the copolymers is found in the range of 10-5Scm-1. These organic semiconductor materials can be used to fabricate thinner and cheaper environmental friendly optoelectronic devices that will replace the conventional inorganic semiconductors.

  2. DNA-directed alkylating ligands as potential antitumor agents: sequence specificity of alkylation by intercalating aniline mustards.

    Science.gov (United States)

    Prakash, A S; Denny, W A; Gourdie, T A; Valu, K K; Woodgate, P D; Wakelin, L P

    1990-10-23

    The sequence preferences for alkylation of a series of novel parasubstituted aniline mustards linked to the DNA-intercalating chromophore 9-aminoacridine by an alkyl chain of variable length were studied by using procedures analogous to Maxam-Gilbert reactions. The compounds alkylate DNA at both guanine and adenine sites. For mustards linked to the acridine by a short alkyl chain through a para O- or S-link group, 5'-GT sequences are the most preferred sites at which N7-guanine alkylation occurs. For analogues with longer chain lengths, the preference of 5'-GT sequences diminishes in favor of N7-adenine alkylation at the complementary 5'-AC sequence. Magnesium ions are shown to selectively inhibit alkylation at the N7 of adenine (in the major groove) by these compounds but not the alkylation at the N3 of adenine (in the minor groove) by the antitumor antibiotic CC-1065. Effects of chromophore variation were also studied by using aniline mustards linked to quinazoline and sterically hindered tert-butyl-9-aminoacridine chromophores. The results demonstrate that in this series of DNA-directed mustards the noncovalent interactions of the carrier chromophores with DNA significantly modify the sequence selectivity of alkylation by the mustard. Relationships between the DNA alkylation patterns of these compounds and their biological activities are discussed.

  3. Kinetics of rapid covalent bond formation of aniline with humic acid: ESR investigations with nitroxide spin labels

    Science.gov (United States)

    Glinka, Kevin; Matthies, Michael; Theiling, Marius; Hideg, Kalman; Steinhoff, Heinz-Jürgen

    2016-04-01

    Sulfonamide antibiotics used in livestock farming are distributed to farmland by application of slurry as fertilizer. Previous work suggests rapid covalent binding of the aniline moiety to humic acids found in soil. In the current work, kinetics of this binding were measured in X-band EPR spectroscopy by incubating Leonardite humic acid (LHA) with a paramagnetic aniline spin label (anilino-NO (2,5,5-Trimethyl-2-(3-aminophenyl)pyrrolidin-1-oxyl)). Binding was detected by a pronounced broadening of the spectral lines after incubation of LHA with anilino-NO. The time evolution of the amplitude of this feature was used for determining the reaction kinetics. Single- and double-exponential models were fitted to the data obtained for modelling one or two first-order reactions. Reaction rates of 0.16 min-1 and 0.012 min-1, were found respectively. Addition of laccase peroxidase did not change the kinetics but significantly enhanced the reacting fraction of anilino-NO. This EPR-based method provides a technically simple and effective method for following rapid binding processes of a xenobiotic substance to humic acids.

  4. Enrichment and molecular characterization of a bacterial culture that degrades methoxy-methyl urea herbicides and their aniline derivatives.

    Science.gov (United States)

    El-Fantroussi, S; Verstraete, W; Top, E M

    2000-12-01

    Soil treated with linuron for more than 10 years showed high biodegradation activity towards methoxy-methyl urea herbicides. Untreated control soil samples taken from the same location did not express any linuron degradation activity, even after 40 days of incubation. Hence, the occurrence in the field of a microbiota having the capacity to degrade a specific herbicide was related to the long-term treatment of the soil. The enrichment culture isolated from treated soil showed specific degradation activity towards methoxy-methyl urea herbicides, such as linuron and metobromuron, while dimethyl urea herbicides, such as diuron, chlorotoluron, and isoproturon, were not transformed. The putative metabolic intermediates of linuron and metobromuron, the aniline derivatives 3, 4-dichloroaniline and 4-bromoaniline, were also degraded. The temperature of incubation drastically affected degradation of the aniline derivatives. Whereas linuron was transformed at 28 and 37 degrees C, 3,4-dichloroaniline was transformed only at 28 degrees C. Monitoring the enrichment process by reverse transcription-PCR and denaturing gradient gel electrophoresis (DGGE) showed that a mixture of bacterial species under adequate physiological conditions was required to completely transform linuron. This research indicates that for biodegradation of linuron, several years of adaptation have led to selection of a bacterial consortium capable of completely transforming linuron. Moreover, several of the putative species appear to be difficult to culture since they were detectable by DGGE but were not culturable on agar plates.

  5. Effect of ortho-substituted aniline on the corrosion protection of aluminum in 2 mol/L H2SO4 solution

    KAUST Repository

    El-Deeb, Mohamed M.

    2017-02-13

    Corrosion protection of aluminum in 2 mol/L HSO solution is examined in the presence of ortho-substituted aniline derivatives using potentiodynamic polarization and electrochemical impedance spectroscopy measurements. Density function theory (DFT) calculations are performed to investigate the aluminum-electrolyte interface relationship in the absence and presence of both ortho-substituted aniline derivatives and sulphate anions, as well as their roles in the protection efficiency at the atomic level. Our results show that ortho-aniline derivatives are good inhibitors and that their efficiencies improved as the concentration increased. SEM-EDX analysis is used to confirm the adsorption thermodynamics of the studied compounds on the aluminum surface. The best inhibitory effect is exhibits in the presence of the methyl group in ortho-position followed by ortho-carboxilic compared to aniline. The adsorption of these compounds on the aluminum surface is well described by Langmuir adsorption isotherm as well as the experimental and the theoretical adosrption energies are in a good agreement. DFT calculations also show that the interaction between the inhibitors and the aluminum surface is mainly electrostatic and depends on the type of the ortho-substituted group in addition to the sulphate anions.

  6. Electrochemical synthesis of novel polymer based on (4-(2,3-dihydrothieno[3,4-6][1,4][dioxin-5-yl) aniline) in aqueous solution: Characterization and application

    International Nuclear Information System (INIS)

    Shahhosseini, Leyla; Nateghi, Mohammad Reza; Kazemipour, Maryam; Borhani Zarandi, Mahmoud

    2016-01-01

    4-(2,3-dihydrothieno[3,4-6][1,4][dioxin-5-yl) aniline, an interesting novel monomer was successfully synthesized in which α-carbon on ethylenedioxythiophene was linked to aniline at para position. The structure of the monomer was approved by infrared (IR), gas chromatography-mass spectrometry (GC-MS) and "1H nuclear magnetic resonance ("1H NMR) spectroscopies. Poly (4-(2,3-dihydrothieno[3,4-6][1,4][dioxin-5-yl) aniline) and its composite with graphene were electrochemically synthesized in aqueous solution by cyclic potential sweep method. The Polymer was characterized by IR and UV–vis spectroscopies, scanning electron microscopy, cyclic voltammetry, and electrochemical impedance spectroscopy techniques. Electrochemical synthesis conditions were optimized to prepare high conducting and porous polymer so it can be efficiently used as a counter electrode in fabrication of dye sensitized solar cells. Photovoltaic experiments revealed that energy conversion efficiency of the solar cell fabricated using polymer composite (7.52%) is 21% greater than that prepared by Pt counter electrode (6.19%). - Highlights: • A Novel monomer comprising aniline and EDOT was synthesized by a simple process. • Poly (ANI-EDOT) was synthesized and characterized by cyclic potential sweep method. • The copolymer changes from yellow at −0.9 V to dark green color at +0.9 V reversibly. • Poly (ANI-EDOT)/graphene is porous with electrocatalytic effect on I_3"− reduction.

  7. Convenient synthesis of benzothiazoles and benzimidazoles through Brønsted acid catalyzed cyclization of 2-amino thiophenols/anilines with β-diketones.

    Science.gov (United States)

    Mayo, Muhammad Shareef; Yu, Xiaoqiang; Zhou, Xiaoyu; Feng, Xiujuan; Yamamoto, Yoshinori; Bao, Ming

    2014-02-07

    Brønsted acid catalyzed cyclization reactions of 2-amino thiophenols/anilines with β-diketones under oxidant-, metal-, and radiation-free conditions are described. Various 2-substituted benzothiazoles/benzimidazoles are obtained in satisfactory to excellent yields. Different groups such as methyl, chloro, nitro, and methoxy linked on benzene rings were tolerated under the optimized reaction conditions.

  8. The use of Trametes versicolor laccase for the polymerization of aniline in the presence of vesicles as templates.

    Science.gov (United States)

    Junker, Katja; Kissner, Reinhard; Rakvin, Boris; Guo, Zengwei; Willeke, Martin; Busato, Stephan; Weber, Thomas; Walde, Peter

    2014-02-05

    The enzymatic polymerization of aniline to polyaniline (PANI) with Trametes versicolor laccase (TvL) as catalyst and dioxygen (O₂) as oxidant was investigated in an aqueous medium containing unilamellar vesicles with an average diameter of about 80 nm formed from AOT (=sodium bis(2-ethylhexyl) sulfosuccinate). Compared to the same reaction carried out with horseradish peroxidase isoenzyme C (HRPC) as catalyst and hydrogen peroxide (H₂O₂) as oxidant, notable differences were found in the kinetics of the reaction, as well as in the characteristics of the PANI obtained. Under comparable optimal conditions, which are pH 3.5 for TvL/O₂ and pH 4.3 for HRPC/H₂O₂, the reaction with TvL/O₂ was much slower than with HRPC/H₂O₂, i.e. ≈27 days vs. 1 day reaction time to reach equilibrium with >90% yield at 25 °C. Although in both cases, aniline monomer coupling occurred mainly via the carbon atom in para position of aniline, UV-vis-NIR absorption and EPR measurements indicate that the reaction with TvL/O₂ yielded mainly overoxidized products (with λ(max)=730 nm). These products had a lower amount of unpaired electrons if compared with the products obtained with HRPC/H₂O₂ (with λ(max)≈1000 nm, which is characteristic for the polaron state of PANI-ES, the emeraldine salt form of PANI). Similarly to previous findings with HRPC/H₂O₂, enzyme inactivation occurred during the polymerization also in the case of TvL/O₂. Since the aqueous PANI-vesicle suspensions obtained are of high colloidal stability, they can be used directly as ink in a conventional thermal inkjet printer for printing on paper or on surface treated polyimide films. Printed PANI-ES patterns on paper changed colour from green (emeraldine salt) to blue (emeraldine base) upon exposure to ammonia gas, demonstrating the expected ammonia sensing properties. Copyright © 2013 Elsevier Inc. All rights reserved.

  9. A novel magnetic poly(aniline-naphthylamine)-based nanocomposite for micro solid phase extraction of rhodamine B

    Energy Technology Data Exchange (ETDEWEB)

    Bagheri, Habib, E-mail: bagheri@sharif.edu; Daliri, Rasoul; Roostaie, Ali

    2013-09-10

    Graphical abstract: -- Highlights: •A Fe{sub 3}O{sub 4}–aniline-naphthylamine nanocomposite was prepared via a simple route. •The magnetic nanocomposite was applied for isolation of RhB from water. •The nanocomposite applicability was compared with other pristine polymers. •The method was applied for the determination of RhB in different samples. -- Abstract: A novel Fe{sub 3}O{sub 4}–poly(aniline-naphthylamine)-based nanocomposite was synthesized by chemical oxidative polymerization process as a magnetic sorbent for micro solid phase extraction. The scanning electron microscopy images of the synthesized nanocomposite revealed that the copolymer posses a porous structure with diameters less than 50 nm. The extraction efficiency of this sorbent was examined by isolation of rhodamine B, a mutagenic and carcinogenic dye, from aquatic media in dispersion mode. Among different synthesized polymers, Fe{sub 3}O{sub 4}/poly(aniline-naphthylamine) nanocomposite showed a prominent efficiency. Parameters including the desorption solvent, amount of sorbent, desorption time, sample pH, ionic strength, extraction time and stirring rate were optimized. Under the optimum condition, a linear spiked calibration curve in the range of 0.35–5.00 μg L{sup −1} with R{sup 2} = 0.9991 was obtained. The limits of detection (3S{sub b}) and limits of quantification (10S{sub b}) of the method were 0.10 μg L{sup −1} and 0.35 μg L{sup −1} (n = 3), respectively. The relative standard deviation for water sample with 0.5 μg L{sup −1} of RhB was 4.2% (n = 5) and the absolute recovery was 92%. The method was applied for the determination of rhodamine B in dishwashing foam, dishwashing liquid, shampoo, pencil, matches tips and eye shadows samples and the relative recovery percentage were in the range of 94–99%.

  10. Synthesis and electrochemical analysis of polyaniline/TiO2 composites prepared with various molar ratios between aniline monomer and para-toluenesulfonic acid

    International Nuclear Information System (INIS)

    Oh, Misoon; Kim, Seok

    2012-01-01

    Graphical abstract: Polyaniline (PANI)/TiO 2 composites were prepared by in situ polymerization using para-toluenesulfonic acid (p-TSA). The composites showed different morphology and specific capacitances as a function of aniline concentration, which are related to the morphology (shape or size) of particles. Scheme of the formation of composites consisting of PANI film and the micelle structures is shown. Highlights: ► PANI/TiO 2 composite were prepared with a different concentration of monomer and dopant. ► Aniline/acid ratio influenced the morphological and electrochemical properties. ► The composites showed different capacitances as a function of aniline concentrations. ► Aniline/acid ratio could influence on the dispersion and surface roughness of particles. - Abstract: Polyaniline (PANI)/titanium dioxide (TiO 2 ) composites were prepared with a chemical oxidation polymerization of aniline monomer (ANI) with various molar ratios between ANI and para toluenesulfonic acid (p-TSA). To find an effect of the [ANI]:[p-TSA] molar ratio on the electrochemical properties of the prepared PANI/TiO 2 composites, the composites were synthesized under same conditions except the p-TSA concentrations. The prepared composite films had more homogeneous TiO 2 dispersion with changing [ANI]:[p-TSA] molar ratios from 6:1 to 1:1. p-TSA surfactant-like doping acid helped the dispersion of TiO 2 particles in the PANI matrix. PANI covering the TiO 2 surfaces was confirmed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Prepared PANI films on the TiO 2 particles had the smoothest surface when the ANI and p-TSA had 1:1 molar ratio in the reaction solution. The composite prepared with molar ratio [ANI]:[p-TSA] of 3:1 had the highest capacitance (800 F g −1 ) among the prepared composites.

  11. Volumetric and transport properties of binary liquid mixtures of sulfolane with aniline, N,N-dimethylaniline and N,N-diethylaniline at different temperatures and atmospheric pressure

    International Nuclear Information System (INIS)

    Aftabuzzaman, M.; Islam, M. Monirul; Nasiruddin; Rima, Farhana Rahman; Islam, M. Nazrul; Ali, M. Azhar

    2016-01-01

    Highlights: • ρ and η of sulfolane + aniline, +N,N-DMA, +N,N-DEA binary mixtures were measured. • V"E values for sulfolane + aniline, +N,N-DMA, +N,N-DEA binary mixtures are negative. • Δη &d_1_2 are positive for sulfolane + aniline, and negative for +N,N-DMA, +N,N-DEA. • The chemical or strong specific interactions exist in sulfolane + aniline mixtures. • The structural effects are dominated in sulfolane +N,N-DMA, +N,N-DEA mixtures.​ - Abstract: Densities and viscosities of pure sulfolane, aniline, N,N-dimethylaniline, N,N-diethylaniline and their binary mixtures with sulfolane as common component were measured over the entire composition range at T = (303.15, 308.15, and 313.15) K and atmospheric pressure. A high precision vibrating-tube densitometer (DSA 5000, Anton-Paar, Austria) was used for the density measurements and a Cannon–Fenske routine type viscometer for the viscosity. The various thermodynamic properties such as excess molar volumes, deviation of viscosity, free energy and excess free energy of activation for viscous flow were calculated for each of the systems. The excess properties were fitted to the Redlich–Kister equation, and coefficients along with standard deviation of fit were also presented. All these properties were discussed in terms of molecular interactions. The experimental findings would be tremendous important for the accurate design of equipment, and controlling the process parameters of various chemical and industrial processes such as separation of chemicals, fluid flow, heat flow or chemical reactions.

  12. Heat capacities of aqueous polar aromatic compounds over a wide range of conditions. Part I: phenol, cresols, aniline, and toluidines

    International Nuclear Information System (INIS)

    Censky, Miroslav; Hnedkovsky, Lubomir; Majer, Vladimir

    2005-01-01

    The heat capacities of dilute aqueous solutions of phenol (hydroxybenzene), three cresols (2-, 3- and 4-methylhydroxybenzene), aniline (aminobenzene) and three toluidines (2-, 3- and 4-methylaminobenzene) were determined using a modified flow Picker-type high temperature calorimeter. The measurements were performed at temperatures between (303 and 623) K or 573 K for compounds containing hydroxy or amino group, respectively, and at several pressures up to 30 MPa. Standard heat capacities (partial molar heat capacities at infinite dilution) obtained from the experimental data exhibit a strong increase with temperature above 500 K consistent with the evolution of the standard volumes reported earlier. The data for aqueous phenol were used for testing several semiempiric models proposed for description of the standard thermodynamic properties of aqueous solutes. Their ability to reproduce the temperature and pressure dependence of standard heat capacities and to extrapolate towards higher conditions were examined

  13. Use of the aniline blue-KOH staining in the study of the banana-Mycosphaerella fijiensis Morelet interaction

    Directory of Open Access Journals (Sweden)

    Milady Mendoza-Rodríguez

    2005-01-01

    Full Text Available The analysis of the first stages of the infection process with the fungus Mycosphaerella fijiensis Morelet was made beginning with the inoculation of young banana plants obtained from in vitro culture. The experimental system host-pathogen studied, included the susceptible cultivar ‘Niyarma yik’ (AA to Black Sigatoka disease and the Pseudocercospora fijiensis isolate CCIBP-Pf1. The fluorescent staining technique with KOH-aniline blue was used for this study. Samples from infected leaves were taken and incubated in a KOH solution, rinsed in deionized water, mounted in the stain solution and examined with ultraviolet fluorescence. The use of this technique allowed to observe the epiphytic growing of the fungus over the plant tissue with high resolution and contrast, in an early stage of the infection. Key words: Black Sigatoka, fungi, Musa

  14. Electrical stimulation promotes nerve cell differentiation on polypyrrole/poly (2-methoxy-5 aniline sulfonic acid) composites.

    Science.gov (United States)

    Liu, Xiao; Gilmore, Kerry J; Moulton, Simon E; Wallace, Gordon G

    2009-12-01

    The purpose of this work was to investigate for the first time the potential biomedical applications of novel polypyrrole (PPy) composites incorporating a large polyelectrolyte dopant, poly (2-methoxy-5 aniline sulfonic acid) (PMAS). The physical and electrochemical properties were characterized. The PPy/PMAS composites were found to be smooth and hydrophilic and have low electrical impedance. We demonstrate that PPy/PMAS supports nerve cell (PC12) differentiation, and that clinically relevant 250 Hz biphasic current pulses delivered via PPy/PMAS films significantly promote nerve cell differentiation in the presence of nerve growth factor (NGF). The capacity of PPy/PMAS composites to support and enhance nerve cell differentiation via electrical stimulation renders them valuable for medical implants for neurological applications.

  15. Prediction of moving bed biofilm reactor (MBBR) performance for the treatment of aniline using artificial neural networks (ANN)

    Energy Technology Data Exchange (ETDEWEB)

    Delnavaz, M. [Tarbiat Modares University, Civil Engineering Department, Environmental Engineering Division, Tehran (Iran, Islamic Republic of); Ayati, B., E-mail: ayati_bi@modares.ac.ir [Tarbiat Modares University, Civil Engineering Department, Environmental Engineering Division, Tehran (Iran, Islamic Republic of); Ganjidoust, H. [Tarbiat Modares University, Civil Engineering Department, Environmental Engineering Division, Tehran (Iran, Islamic Republic of)

    2010-07-15

    In this study, the results of 1-year efficiency forecasting using artificial neural networks (ANN) models of a moving bed biofilm reactor (MBBR) for a toxic and hard biodegradable aniline removal were investigated. The reactor was operated in an aerobic batch and continuous condition with 50% by volume which was filled with light expanded clay aggregate (LECA) as carrier. Efficiency evaluation of the reactors was obtained at different retention time (RT) of 8, 24, 48 and 72 h with an influent COD from 100 to 4000 mg/L. Exploratory data analysis was used to detect relationships between the data and dependent evaluated one. The appropriate architecture of the neural network models was determined using several steps of training and testing of the models. The ANN-based models were found to provide an efficient and a robust tool in predicting MBBR performance for treating aromatic amine compounds.

  16. Free radical generation from an aniline derivative in HepG2 cells: a possible captodative effect.

    Science.gov (United States)

    Horinouchi, Yuya; Summers, Fiona A; Ehrenshaft, Marilyn; Mason, Ronald P

    2015-01-01

    Xenobiotic metabolism can induce the generation of protein radicals, which are believed to play an important role in the toxicity of chemicals and drugs. It is therefore important to identify chemical structures capable of inducing macromolecular free radical formation in living cells. In this study, we evaluated the ability of four structurally related environmental chemicals, aniline, nitrosobenzene, N,N-dimethylaniline, and N,N-dimethyl-4-nitrosoaniline (DMNA), to induce free radicals and cellular damage in the hepatoma cell line HepG2. Cytotoxicity was assessed using lactate dehydrogenase assays, and morphological changes were observed using phase contrast microscopy. Protein free radicals were detected by immuno-spin trapping using in-cell western experiments and confocal microscopy to determine the subcellular locale of free radical generation. DMNA induced free radical generation, lactate dehydrogenase release, and morphological changes in HepG2 cells, whereas aniline, nitrosobenzene, N,N-dimethylaniline did not. Confocal microscopy showed that DMNA induced free radical generation mainly in the cytosol. Preincubation of HepG2 cells with N-acetylcysteine and 2,2'-dipyridyl significantly prevented free radical generation on subsequent incubation with DMNA, whereas preincubation with apocynin and dimethyl sulfoxide had no effect. These results suggest that DMNA is metabolized to reactive free radicals capable of generating protein radicals which may play a critical role in DMNA toxicity. We propose that the captodative effect, the combined action of the electron-releasing dimethylamine substituent, and the electron-withdrawing nitroso substituent, leads to a thermodynamically stabilized radical, facilitating enhanced protein radical formation by DMNA. Copyright © 2014 Elsevier Inc. All rights reserved.

  17. Binary Mixtures of Nonyl Phenol with Alkyl Substituted Anilines as Corrosion Inhibitors for Mild Steel in Acidic Medium

    Directory of Open Access Journals (Sweden)

    H. S. Shukla

    2012-01-01

    Full Text Available The present study deals with the evaluation of the corrosion inhibition effectiveness of the two binary mixtures of nonyl phenol (NPH with 2, 4 dimethyl aniline (DMA and 2 ethyl aniline (EA at different concentration ratios (from 1:7 to 7:1 for mild steel in H2SO4 (pH=1 solution by weight loss and potentiodynamic polarization method. Corrosion inhibition ability of the compounds has been tested at different exposure periods (6 h to 24 h and at different temperatures (303 K to 333 K. The binary mixture of NPH and EA (at 7:1 concentration ratio has afforded maximum inhibition (IE% 93.5% at 6 h exposure period and at room temperature. The adsorption of both the inhibitors is found to accord with Temkin adsorption isotherm. Potentiodynamic polarization study reveals that the tested inhibitors are mixed type inhibitor and preferentially act on cathodic areas. Electrochemical impedance study suggests formation of an inhibition layer by the adsorption of the inhibitors on the metal surface. An adsorption model of the inhibitor molecules on the metal surface has been proposed after immersion test in the inhibited acid showed characteristic shift of N-H and O-H bond frequencies towards lower side compared to that of the respective pure samples which indicated the donation of electron pair through N and O atom of the inhibitor molecule in the surface adsorption phenomena. SEM study has revealed formation of semi globular inhibitor products on the metal surface. The comparisons of the protection efficiencies of these compounds according to their relative electron density on the adsorption centre and projected molecular area of the inhibitor molecules have been made.

  18. Induction by phenobarbital of aniline-p-hydroxylase in mouse liver under the influence of X-irradiation and 2,4,6-triethyleneimino-1,3,5-triazine

    International Nuclear Information System (INIS)

    Erger, M.; Hollatz, R.; Tempel, K.

    1977-01-01

    The phenobarbital-induced activity of aniline-p-hydroxylase in livers of mice was enhanced additionally when the animals were X-irradiated 4-16 hours before the administration of the inducer. The same effect could be demonstrated after repeated irradiation with low doses. 2,4,6-triethyleneimino-1,3,5-triazine (tretamine) inhibited the induction of aniline-p-hydroxylase only when administered in extremely high doses. Lower doses resulted in 'superinduciton'. (orig.) [de

  19. Application of poly(aniline) as an ion exchanger for the separation of palladium, iridium, platinum and gold prior to their determination by neutron activation analysis

    International Nuclear Information System (INIS)

    Kumar, S.; Verma, R.; Gangadharan, S.

    1993-01-01

    The distribution coefficients of Pd II , Ir IV , Pt IV and Au III on poly(aniline) in 0.1-10 mol 1 -1 HCl were determined. They are strongly adsorbed at low acidities and the extent of adsorption decreases with increase in acidity, except for Au III , Palladium, Pt and Au are quantitatively eluted with 5% thiourea in 0.05 mol -1 HCl whereas the recovery of Ir is > 90% with 1% ascorbic acid followed by 10 mol -1 HCl. It was found that Cr, Fe, Co, Ni, Zn, Ga and Ge are not retained on poly(aniline) at low acidities. This separation procedure was applied prior to the determination of Pd, Ir, Pt and Au in iron meteorite and PCC-1 standard rock by neutron activation analysis. (author)

  20. Corrosion inhibition of aluminum with a series of aniline monomeric surfactants and their analog polymers in 0.5 M HCl solution

    Directory of Open Access Journals (Sweden)

    M.M. El-Deeb

    2015-07-01

    Full Text Available The inhibition effect of 3-(12-sodiumsulfonate dodecyloxy aniline monomeric surfactant (MC12 and its analog polymer Poly 3-(dodecyloxy sulfonic acid aniline (PC12 on the corrosion of aluminum in 0.5 M HCl solution was investigated using weight loss and potentiodynamic polarization techniques. The presence of these two compounds in 0.5 M HCl inhibits the corrosion of aluminum without modifying the mechanism of corrosion process. It was found that these inhibitors act as mixed-type inhibitors with anodic predominance as well as the inhibition efficiency increases with increasing inhibitor concentration, but decreases with raising temperature. Langmuir and Frumkin adsorption isotherms fit well with the experimental data. Thermodynamic functions for both dissolution and adsorption processes were determined. The obtained results from weight loss and potentiodynamic polarization techniques are in good agreement with contact angle measurements.

  1. Hydroamination reactions of alkynes with ortho-substituted anilines in ball mills: synthesis of benzannulated N-heterocycles by a cascade reaction.

    Science.gov (United States)

    Weiße, Maik; Zille, Markus; Jacob, Katharina; Schmidt, Robert; Stolle, Achim

    2015-04-20

    It was demonstrated that ortho-substituted anilines are prone to undergo hydroamination reactions with diethyl acetylenedicarboxylate in a planetary ball mill. A sequential coupling of the intermolecular hydroamination reaction with intramolecular ring closure was utilized for the syntheses of benzooxazines, quinoxalines, and benzothiazines from readily available building blocks, that is, electrophilic alkynes and anilines with OH, NH, or SH groups in the ortho position. For the heterocycle formation, it was shown that several stress conditions were able to initiate the reaction in the solid state. Processing in a ball mill seemed to be advantageous over comminution with mortar and pestle with respect to process control. In the latter case, significant postreaction modification occurred during solid-state analysis. Cryogenic milling proved to have an adverse effect on the molecular transformation of the reagents. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  2. Horseradish Peroxidase (HRP Immobilized Poly(aniline-co-m-aminophenol Film Electrodes–fabrication and Evaluation as Hydrogen Peroxide Sensor

    Directory of Open Access Journals (Sweden)

    Seong-Ho Choi

    2007-05-01

    Full Text Available Enzyme modified electrodes were fabricated with poly(aniline-co-m-aminophenol. Electrochemical polymerization of aniline and m-aminophenol wasperformed to get the film of copolymer on the surface of gold electrode. Modifiedelectrodes were fabricated by two methods, physical entrapment and covalent cross-linking.In one of the method, gold nanoparticles were loaded into the copolymer film andhorseradish peroxidase (HRP was immobilized into the Au nanoparticle loaded copolymerfilm through physical entrapment. In the other method, the amino and -OH groups in thecopolymer are utilized to form covalent functionalization with HRP via glutaric dialdehydeas cross-linker/mediator. The conducting copolymer/enzyme modified electrodes preparedby physical entrapment/covalent functionalization of enzyme were tested forelectrocatalytic activities towards sensing of H2O2. Amperometric results indicate thatenzyme modified electrode via physical entrapment possesses better electrocatalyticperformance over covalent functionalized enzyme electrode.

  3. A New Nano Silica Gel Supported by Thionyl Chloride as a Solid Acid for the Efficient Diazotization of Aniline Derivatives: Application and Synthesis of Azo Dyes

    Directory of Open Access Journals (Sweden)

    Mohammad Mirjalili

    2012-01-01

    Full Text Available A new nano silicagel supported by thionyl chloride as a solid acid was synthesized and used as a increasing the production yield of dye to affect the efficient diazotization of arylamines. The diazonium salts thus obtained were coupled, using standard experimental procedures, to anilines and naphthols to afford the requisite azo dyes in good yield. The diazotization and subsequent azo-coupling generated the related azo dyes at low temperature in short reaction times with a simple experimental procedure.

  4. Electrochemical synthesis of novel polymer based on (4-(2,3-dihydrothieno[3,4-6][1,4][dioxin-5-yl) aniline) in aqueous solution: Characterization and application

    Energy Technology Data Exchange (ETDEWEB)

    Shahhosseini, Leyla [Chemistry Department, Kerman Branch, Islamic Azad University, Kerman (Iran, Islamic Republic of); Nateghi, Mohammad Reza, E-mail: mnateghi@iauyazd.ac.ir [Chemistry Department, Yazd Branch, Islamic Azad University, Yazd (Iran, Islamic Republic of); Kazemipour, Maryam [Chemistry Department, Kerman Branch, Islamic Azad University, Kerman (Iran, Islamic Republic of); Borhani Zarandi, Mahmoud [Department of Physics, Yazd University, P.O. Box 97175/615, Yazd (Iran, Islamic Republic of)

    2016-07-01

    4-(2,3-dihydrothieno[3,4-6][1,4][dioxin-5-yl) aniline, an interesting novel monomer was successfully synthesized in which α-carbon on ethylenedioxythiophene was linked to aniline at para position. The structure of the monomer was approved by infrared (IR), gas chromatography-mass spectrometry (GC-MS) and {sup 1}H nuclear magnetic resonance ({sup 1}H NMR) spectroscopies. Poly (4-(2,3-dihydrothieno[3,4-6][1,4][dioxin-5-yl) aniline) and its composite with graphene were electrochemically synthesized in aqueous solution by cyclic potential sweep method. The Polymer was characterized by IR and UV–vis spectroscopies, scanning electron microscopy, cyclic voltammetry, and electrochemical impedance spectroscopy techniques. Electrochemical synthesis conditions were optimized to prepare high conducting and porous polymer so it can be efficiently used as a counter electrode in fabrication of dye sensitized solar cells. Photovoltaic experiments revealed that energy conversion efficiency of the solar cell fabricated using polymer composite (7.52%) is 21% greater than that prepared by Pt counter electrode (6.19%). - Highlights: • A Novel monomer comprising aniline and EDOT was synthesized by a simple process. • Poly (ANI-EDOT) was synthesized and characterized by cyclic potential sweep method. • The copolymer changes from yellow at −0.9 V to dark green color at +0.9 V reversibly. • Poly (ANI-EDOT)/graphene is porous with electrocatalytic effect on I{sub 3}{sup −} reduction.

  5. N-oxide as a traceless oxidizing directing group: mild rhodium(III)-catalyzed C-H olefination for the synthesis of ortho-alkenylated tertiary anilines.

    Science.gov (United States)

    Huang, Xiaolei; Huang, Jingsheng; Du, Chenglong; Zhang, Xingyi; Song, Feijie; You, Jingsong

    2013-12-02

    Double role: A traceless directing group also acts as an internal oxidant in a novel Rh(III) -catalyzed protocol developed for the synthesis of ortho-alkenylated tertiary anilines. A five-membered cyclometalated Rh(III) complex is proposed as a plausible intermediate and confirmed by X-ray crystallographic analysis. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  6. Electrochemical polymerization of an aniline-terminated self-assembled monolayer on indium tin oxide electrodes and its effect on polyaniline electrodeposition

    Energy Technology Data Exchange (ETDEWEB)

    Cruz-Silva, Rodolfo [Centro de Investigacion en Ingenieria y Ciencias Aplicadas, UAEM. Av. Universidad 1001Col. Chamilpa, CP 62210, Cuernavaca, Mor. (Mexico)], E-mail: rcruzsilva@uaem.mx; Nicho, Maria E.; Resendiz, Mary C.; Agarwal, Vivechana [Centro de Investigacion en Ingenieria y Ciencias Aplicadas, UAEM. Av. Universidad 1001Col. Chamilpa, CP 62210, Cuernavaca, Mor. (Mexico); Castillon, Felipe F.; Farias, Mario H. [Centro de Ciencias de la Materia Condensada de la UNAM, Apdo. Postal 2681 C.P. 22800 Ensenada, B.C. (Mexico)

    2008-06-02

    Indium tin oxide (ITO) transparent electrodes were surface modified by a self-assembled monolayer of N-phenyl-{gamma}-aminopropyl-trimethoxysilane (PAPTS). Cyclic voltammetry of the PAPTS monolayer in aniline-free aqueous electrolyte showed the typical shape of a surface-confined monomer, due to the oxidation of the aniline moieties. This process resulted in a two-dimensional polyaniline film with uniform thickness of 1.3 nm, as measured by atomic force microscopy. X-ray photoelectron and UV-visible spectroscopic techniques confirm the formation of a conjugated polymer film. The influence of the surface modification of ITO electrodes on polyaniline electrochemical deposition was also studied. The initial oxidation rate of aniline increased in the PAPTS-modified ITO electrodes, although the overall film formation rate was lower than that of unmodified ITO electrodes. The morphology of the electrodeposited polyaniline films on PAPTS-modified and unmodified ITO electrodes was studied by atomic force microscopy. Films of smaller grain were grown in the PAPTS-modified ITO as compared to films grown on unmodified ITO. A blocking effect due to the propyl spacer is proposed to explain the reduced electron transfer in PAPTS-modified electrodes.

  7. Effect of the intercalated cation-exchanged on the properties of nanocomposites prepared by 2-aminobenzene sulfonic acid with aniline and montmorillonite

    Energy Technology Data Exchange (ETDEWEB)

    Toumi, I. [Laboratoire de Chimie Organique, Macromoleculaire et des Materiaux, Universite de Mascara, Bp 763 Mascara 29000 (Algeria); Benyoucef, A., E-mail: ghani29000@yahoo.fr [Laboratoire de Chimie Organique, Macromoleculaire et des Materiaux, Universite de Mascara, Bp 763 Mascara 29000 (Algeria); Yahiaoui, A. [Laboratoire de Chimie Organique, Macromoleculaire et des Materiaux, Universite de Mascara, Bp 763 Mascara 29000 (Algeria); Quijada, C. [Departamento de Ingenieria Textil y Papelera, Universidad Politecnica de Valencia, Pza Ferrandiz i Carbonel, E-03801 Alcoy, Alicante (Spain); Morallon, E. [Departamento de Quimica Fisica e Instituto Universitario de Materiales, Universidad de Alicante, Apartado 99, E-03080 Alicante (Spain)

    2013-02-25

    Polymer/montmorillonite nanocomposites were prepared. Intercalation of 2-aminobenzene sulfonic acid with aniline monomers into montmorillonite modified by cation was followed by subsequent oxidative polymerization of monomers in the interlayer spacing. The clay was prepared by cation exchange process between sodium cation in (M-Na) and copper cation (M-Cu). XRD analyses show the manifestation of a basal spacing (d-spacing) for M-Cu changes depending on the inorganic cation and the polymer intercalated in the M-Cu structure. TGA analyses reveal that polymer/M-Cu composites is less stable than M-Cu. The conductivity of the composites is found to be 10{sup 3} times higher than that for M-Cu. The microscopic examinations including TEM picture of the nanocomposite demonstrated an entirely different and more compatible morphology. Remarkable differences in the properties of the polymers have also been observed by UV-Vis and FTIR, suggesting that the polymer produced with presence of aniline has a higher degree of branching. The electrochemical behavior of the polymers extracted from the nanocomposites has been studied by cyclic voltammetry which indicates the electroactive effect of nanocomposite gradually increased with aniline in the polymer chain.

  8. In-situ synthesis of SiO2@MOF composites for high-efficiency removal of aniline from aqueous solution

    Science.gov (United States)

    Han, Tongtong; Li, Caifeng; Guo, Xiangyu; Huang, Hongliang; Liu, Dahuan; Zhong, Chongli

    2016-12-01

    A series of SiO2@aluminum-MOF(MIL-68) composites with different SiO2 loadings have been synthesized by a simple and mild compositing strategy for high-efficiency removal of aniline. As evidenced from SEM and TEM images as well as the particle size distribution, the incorporation of SiO2 can improve the dispersity of MIL-68(Al) in composites, and result in the smaller particle size than that of pristine MIL-68(Al). Besides, the adsorption of aniline over SiO2, MIL-68(Al), the physical mixture of these two materials, and SiO2@MIL-68(Al) composites was investigated comparatively, demonstrating a relatively high adsorption capacity (531.9 mg g-1) of 7% SiO2@MIL-68(Al) towards aniline. Combining the ultrafast adsorption dynamics (reaching equilibrium within 40 s) and great reusability, 7% SiO2@MIL-68(Al) shows excellent adsorption performance. This indicates that the SiO2@MIL-68(Al) composites possess great potential applications as a kind of fascinating adsorbent in water pollution protection.

  9. Photocatalytic Conversion of Nitrobenzene to Aniline through Sequential Proton-Coupled One-Electron Transfers from a Cadmium Sulfide Quantum Dot

    Energy Technology Data Exchange (ETDEWEB)

    Jensen, Stephen C. [Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States; Bettis Homan, Stephanie [Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States; Weiss, Emily A. [Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States

    2016-01-28

    This paper describes the use of cadmium sulfide quantum dots (CdS QDs) as visible-light photocatalysts for the reduction of nitrobenzene to aniline through six sequential photoinduced, proton-coupled electron transfers. At pH 3.6–4.3, the internal quantum yield of photons-to-reducing electrons is 37.1% over 54 h of illumination, with no apparent decrease in catalyst activity. Monitoring of the QD exciton by transient absorption reveals that, for each step in the catalytic cycle, the sacrificial reductant, 3-mercaptopropionic acid, scavenges the excitonic hole in ~5 ps to form QD•–; electron transfer to nitrobenzene or the intermediates nitrosobenzene and phenylhydroxylamine then occurs on the nanosecond time scale. The rate constants for the single-electron transfer reactions are correlated with the driving forces for the corresponding proton-coupled electron transfers. This result suggests, but does not prove, that electron transfer, not proton transfer, is rate-limiting for these reactions. Nuclear magnetic resonance analysis of the QD–molecule systems shows that the photoproduct aniline, left unprotonated, serves as a poison for the QD catalyst by adsorbing to its surface. Performing the reaction at an acidic pH not only encourages aniline to desorb but also increases the probability of protonated intermediates; the latter effect probably ensures that recruitment of protons is not rate-limiting.

  10. Scavenging of free-radical metabolites of aniline xenobiotics and drugs by amino acid derivatives: toxicological implications of radical-transfer reactions.

    Science.gov (United States)

    Michail, Karim; Baghdasarian, Argishti; Narwaley, Malyaj; Aljuhani, Naif; Siraki, Arno G

    2013-12-16

    We investigated a novel scavenging mechanism of arylamine free radicals by poly- and monoaminocarboxylates. Free radicals of arylamine xenobiotics and drugs did not react with oxygen in peroxidase-catalyzed reactions; however, they showed marked oxygen uptake in the presence of an aminocarboxylate. These free-radical intermediates were identified using the spin trap 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) and electron paramagnetic resonance (EPR) spectrometry. Diethylenetriaminepentaacetic acid (DTPA), a polyaminocarboxylate, caused a concentration-dependent attenuation of N-centered radicals produced by the peroxidative metabolism of arylamines with the subsequent formation of secondary aliphatic carbon-centered radicals stemming from the cosubstrate molecule. Analogously, N,N-dimethylglycine (DMG) and N-methyliminodiacetate (MIDA), but not iminodiacetic acid (IDA), demonstrated a similar scavenging effect of arylamine-derived free radicals in a horseradish peroxidase/H2O2 system. Using human promyelocytic leukemia (HL-60) cell lysate as a model of human neutrophils, DTPA, MIDA, and DMG readily reduced anilinium cation radicals derived from the arylamines and gave rise to the corresponding carbon radicals. The rate of peroxidase-triggered polymerization of aniline was studied as a measure of nitrogen-radical scavenging. Although, IDA had no effect on the rate of aniline polymerization, this was almost nullified in the presence of DTPA and MIDA at half of the molar concentration of the aniline substrate, whereas a 20 molar excess of DMPO caused only a partial inhibition. Furthermore, the yield of formaldehyde, a specific reaction endproduct of the oxidation of aminocarboxylates by aniline free-radical metabolites, was quantitatively determined. Azobenzene, a specific reaction product of peroxidase-catalyzed free-radical dimerization of aniline, was fully abrogated in the presence of DTPA, as confirmed by GC/MS. Under aerobic conditions, a radical-transfer reaction

  11. Coupling of bio-PRB and enclosed in-well aeration system for remediation of nitrobenzene and aniline in groundwater.

    Science.gov (United States)

    Liu, Na; Ding, Feng; Wang, Liu; Liu, Peng; Yu, Xiaolong; Ye, Kang

    2016-05-01

    A laboratory-scale bio-permeable reactive barrier (bio-PRB) was constructed and combined with enclosed in-well aeration system to treat nitrobenzene (NB) and aniline (AN) in groundwater. Batch-style experiments were first conducted to evaluate the effectiveness of NB and AN degradation, using suspension (free cells) of degrading consortium and immobilized consortium by a mixture of perlite and peat. The NB and AN were completely degraded in 4 mg L(-1) when the aeration system was applied into the bio-PRB system. The NB and AN were effectively removed when the aeration system was functional in the bio-PRB. The removal efficiency decreased when the aeration system malfunctioned for 20 days, thus indicating that DO was an important factor for the degradation of NB and AN. The regain of NB and AN removal after the malfunction indicates the robustness of degradation consortium. No original organics and new formed by-products were observed in the effluent. The results indicate that NB and AN in groundwater can be completely mineralized in a bio-PRB equipped with enclosed in-well aeration system and filled with perlite and peat attached with degrading consortium.

  12. ITO/Poly(Aniline/Sol-Gel Glass: An Optically Transparent, pH-Responsive Substrate for Supported Lipid Bilayers

    Directory of Open Access Journals (Sweden)

    Ahmed Al-Obeidi

    2013-01-01

    Full Text Available Described here is fabrication of a pH-sensitive, optically transparent transducer composed of a planar indium-tin oxide (ITO electrode overcoated with a poly(aniline (PANI thin film and a porous sol-gel layer. Adsorption of the PANI film renders the ITO electrode sensitive to pH, whereas the sol-gel spin-coated layer makes the upper surface compatible with fusion of phospholipid vesicles to form a planar supported lipid bilayer (PSLB. The response to changes in the pH of the buffer contacting the sol-gel/PANI/ITO electrode is pseudo-Nernstian with a slope of 52 mV/pH over a pH range of 4–9. Vesicle fusion forms a laterally continuous PSLB on the upper sol-gel surface that is fluid with a lateral lipid diffusion coefficient of 2.2 μm2/s measured by fluorescence recovery after photobleaching. Due to its lateral continuity and lack of defects, the PSLB blocks the pH response of the underlying electrode to changes in the pH of the overlying buffer. This architecture is simpler to fabricate than previously reported ITO electrodes derivatized for PSLB formation and should be useful for optical monitoring of proton transport across supported membranes derivatized with ionophores and ion channels.

  13. Graphene Derivative in Magnetically Recoverable Catalyst Determines Catalytic Properties in Transfer Hydrogenation of Nitroarenes to Anilines with 2-Propanol.

    Science.gov (United States)

    Das, Vijay Kumar; Mazhar, Sumaira; Gregor, Lennon; Stein, Barry D; Morgan, David Gene; Maciulis, Nicholas A; Pink, Maren; Losovyj, Yaroslav; Bronstein, Lyudmila M

    2018-06-14

    Here, we report transfer hydrogenation of nitroarenes to aminoarenes using 2-propanol as a hydrogen source and Ag-containing magnetically recoverable catalysts based on partially reduced graphene oxide (pRGO) sheets. X-ray diffraction and X-ray photoelectron spectroscopy data demonstrated that, during the one-pot catalyst synthesis, formation of magnetite nanoparticles (NPs) is accompanied by the reduction of graphene oxide (GO) to pRGO. The formation of Ag 0 NPs on top of magnetite nanoparticles does not change the pRGO structure. At the same time, the catalyst structure is further modified during the transfer hydrogenation, leading to a noticeable increase of sp 2 carbons. These carbons are responsible for the adsorption of substrate and intermediates, facilitating a hydrogen transfer from Ag NPs and creating synergy between the components of the catalyst. The nitroarenes with electron withdrawing and electron donating substituents allow for excellent yields of aniline derivatives with high regio and chemoselectivity, indicating that the reaction is not disfavored by these functionalities. The versatility of the catalyst synthetic protocol was demonstrated by a synthesis of an Ru-containing graphene derivative based catalyst, also allowing for efficient transfer hydrogenation. Easy magnetic separation and stable catalyst performance in the transfer hydrogenation make this catalyst promising for future applications.

  14. A hybrid heterojunction with reverse rectifying characteristics fabricated by magnetron sputtered TiOx and plasma polymerized aniline structure

    International Nuclear Information System (INIS)

    Sarma, Bimal K; Pal, Arup R; Bailung, Heremba; Chutia, Joyanti

    2012-01-01

    A TiO x film produced by direct current reactive magnetron sputtering without substrate heating or post-deposition annealing and a plasma polymerized aniline (PPA) structure deposited in the same reactor by a radio-frequency glow discharge without the assistance of a carrier gas are used for the fabrication of a heterojunction. The gas phase discharge is investigated by a Langmuir probe and optical emission spectroscopy. The individual layers and the heterojunction are characterized for structural and optoelectronic properties. PPA has polymer-like structure and texture and is characterized by saturated-unsaturated, branched and crosslinked networks. X-ray photoelectron spectroscopy reveals a slightly reduced TiO x surface, which exhibits near band edge luminescence. The free radicals trapped in PPA readily react with oxygen when exposed to atmosphere. The heterojunction shows reverse rectifying characteristics under dark and ultraviolet (UV) irradiation. The energy levels of TiO x and PPA might exhibit reverse band bending and electrons and holes are accumulated on both sides of the heterojunction. The charge accumulation phenomena at the interface may play a key role in the device performance of a hybrid heterojunction. The current-voltage characteristic of the heterojunction is sensitive to UV light, so the structure may be used for photo-sensing applications. (paper)

  15. Capacitance properties and structure of electroconducting hydrogels based on copoly(aniline - p-phenylenediamine) and polyacrylamide

    Science.gov (United States)

    Smirnov, Michael A.; Sokolova, Maria P.; Bobrova, Natalya V.; Kasatkin, Igor A.; Lahderanta, Erkki; Elyashevich, Galina K.

    2016-02-01

    Electroconducting hydrogels (EH) based on copoly(aniline - p-phenylenediamine) grafted to the polyacrylamide for the application as pseudo-supercapacitor's electrodes have been prepared. The influence of preparation conditions on the structure and capacitance properties of the systems were investigated: we determined the optimal amount of p-phenylenediamine to obtain the network of swollen interconnected nanofibrils inside the hydrogel which provides the formation of continuous conducting phase. Structure and morphology of the prepared samples were investigated with UV-VIS spectroscopy, scanning electron microscopy (SEM) and wide-angle X-ray diffraction (WAXD). The maximal value of capacitance was 364 F g-1 at 0.2 A g-1. It was shown that the EH samples demonstrate the retention of 50% of their capacity at high current density 16 A g-1. Cycle-life measurements show evidence that capacitance of EH electrodes after 1000 cycles is higher than its initial value for all prepared samples. Changes of the copolymer structure during swelling in water have been studied with WAXD.

  16. A novel layered manganese oxide/poly(aniline-co-o-anisidine) nanocomposite and its application for electrochemical supercapacitor

    International Nuclear Information System (INIS)

    Yang Xiaofeng; Wang Gengchao; Wang Ruiyu; Li Xingwei

    2010-01-01

    A novel layered manganese oxide/poly(aniline-co-o-anisidine) nanocomposite [MnO 2 /P(An-co-oAs)] was successfully synthesized by a delamination/reassembling process using P(An-co-oAs) ionomer and layered manganese oxide in aqueous solution. This nanocomposite obtained was then characterized by Fourier transform infrared (FTIR) spectra, X-ray diffraction (XRD), electron microscopy (SEM), and thermogravimetric (TG) analysis. X-ray diffraction and electron microscope analysis showed that the MnO 2 /P(An-co-oAs) nanocomposite had a lamellar structure with increasing interlayer spacing. The MnO 2 /P(An-co-oAs) nanocomposite exhibited substantially improved conductivity, which was near 100 times greater than that of its pristine MnO 2 (3.5 x 10 -7 S cm -1 ). The specific capacitance of the MnO 2 /P(An-co-oAs) nanocomposite reached 262 F g -1 in 1 M Na 2 SO 4 at a current density of 1 A g -1 , which was significantly higher than that of either of its two pristine materials [MnO 2 (182 F g -1 ) or P(An-co-oAs) (127 F g -1 )] owing to the synergic effect between the two pristine components. The fabrication mechanism of the nanocomposite was also proposed and discussed in this paper.

  17. 3D Printing of Aniline Tetramer-Grafted-Polyethylenimine and Pluronic F127 Composites for Electroactive Scaffolds.

    Science.gov (United States)

    Dong, Shi-Lei; Han, Lu; Du, Cai-Xia; Wang, Xiao-Yu; Li, Lu-Hai; Wei, Yen

    2017-02-01

    Electroactive hydrogel scaffolds are fabricated by the 3D-printing technique using composites of 30% Pluronic F127 and aniline tetramer-grafted-polyethylenimine (AT-PEI) copolymers with various contents from 2.5% to 10%. The synthesized AT-PEI copolymers can self-assemble into nanoparticles with the diameter of ≈50 nm and display excellent electroactivity due to AT conjugation. The copolymers are then homogeneously distributed into 30% Pluronic F127 solution by virtue of the thermosensitivity of F127, denoted as F/AT-PEI composites. Macroscopic photographs of latticed scaffolds elucidate their excellent printability of F/AT-PEI hydrogels for the 3D-printing technique. The conductivities of the printed F/AT-PEI scaffolds are all higher than 2.0 × 10 -3 S cm -1 , which are significantly improved compared with that of F127 scaffold with only 0.94 × 10 -3 S cm -1 . Thus, the F/AT-PEI scaffolds can be considered as candidates for application in electrical stimulation of tissue regeneration such as repair of muscle and cardiac nerve tissue. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  18. The effect of solution pH and peroxide in the TiO2-induced photocatalysis of chlorinated aniline

    International Nuclear Information System (INIS)

    Chu, W.; Choy, W.K.; So, T.Y.

    2007-01-01

    Chlorinated anilines are frequently used in the industry as starting materials for chemical synthesis. This type of compounds can end up as pollutants in wastewater. 2-Chloroaniline (2-ClA) was selected irradiating under monochromatic UV light at 300 nm. The reaction rate could be enhanced by introducing low level of H 2 O 2 into the UV/TiO 2 system. Excess H 2 O 2 could not increase the HO· generation but retarded the reaction rate. The pH effect was also investigated in UV/TiO 2 and UV/TiO 2 /H 2 O 2 systems. All the experimental results show that pH is a sensitive parameter to the rate of degradation. Low reaction rate at acidic pH could be accounted by the dark adsorption test which has also proven the photocatalysis of TiO 2 may contribute to a two-step process: (1) 2-ClA pre-adsorbed onto TiO 2 and (2) photoexcitation of TiO 2 . At high pH, rate enhancement could be observed at UV/TiO 2 system because of the increase generation of HO·. However, the introduction of H 2 O 2 slowdown the decay rate at such alkaline medium

  19. Modeling studies: Adsorption of aniline blue by using Prosopis Juliflora carbon/Ca/alginate polymer composite beads.

    Science.gov (United States)

    Kumar, M; Tamilarasan, R

    2013-02-15

    The research article describes the experimental and modeling study for the adsorptive removal of aniline blue dye (AB dye) from aqueous matrices using a Prosopis Juliflora modified carbon/Ca/alginate polymer bead as a low cost and eco-friendly adsorbent. The rate of adsorption was investigated under various experimental parameters such as contact time, adsorbent dose, dye concentration, pH and temperature. The kinetics, equilibrium and thermodynamic studies were assessed to find out the efficiency of the adsorption process. The equilibrium uptake capacity of the adsorption process was found with Freundlich and Langmuir adsorption isotherm equations and it was evaluated by dimensionless separation factor (R(L)). The dynamics of adsorption was predicted by pseudo-first order, pseudo-second order Lagergren's equation and intra particle diffusion model. Adsorption feasibility was assessed with thermodynamic parameters such as isosteric heat of adsorption (ΔH°), standard entropy (ΔS°) and Gibbs free energy (ΔG°) using VantHoff plot. The alginate bead was characterized with FTIR spectroscopy and Scanning Electron Microscopy (SEM). Crown Copyright © 2012. Published by Elsevier Ltd. All rights reserved.

  20. Assessment of Chromatin Maturity in Human Spermatozoa: Useful Aniline Blue Assay for Routine Diagnosis of Male Infertility

    Directory of Open Access Journals (Sweden)

    Afifa Sellami

    2013-01-01

    Full Text Available During spermatogenesis, sperm chromatin undergoes structural changes and results in a high condensation. This nuclear compaction would be useful as a predictor of sperm fertilization capacity and pregnancy outcome. We purpose to evaluate firstly the relationship among chromatin maturity assessed by aniline blue staining (AB and the semen parameters in infertile men. Secondly, we analyzed whether the sperm gradient density centrifugation is effective to select mature spermatozoa. Fifty-one ejaculates were investigated by semen analysis and stained for chromatin condensation with AB to distinguish between unstained mature sperm and stained immature sperm. AB was applied also on 12 ejaculates which proceeded by density gradient centrifugation to compare the rates of immature sperm before and after selection. Neat semen were divided into two groups: G1 (: immature sperm <20% and G2 (: immature sperm ≥20%. No significant differences were detected in sperm concentration, motility, and normal morphology between G1 and G2. However, the rates of some morphology abnormalities were higher in G2: head abnormalities ( and microcephalic sperm (. We founded significant correlation between sperm immaturity and acrosome abnormalities (; . Sperm selection has significantly reduced the rates of immature sperm. A better understanding of chromatin structure and its impact on the sperm potential is needed to explore male infertility.

  1. Chemical genetics analysis of an aniline mustard anticancer agent reveals complex I of the electron transport chain as a target.

    Science.gov (United States)

    Fedeles, Bogdan I; Zhu, Angela Y; Young, Kellie S; Hillier, Shawn M; Proffitt, Kyle D; Essigmann, John M; Croy, Robert G

    2011-09-30

    The antitumor agent 11β (CAS 865070-37-7), consisting of a DNA-damaging aniline mustard linked to an androgen receptor (AR) ligand, is known to form covalent DNA adducts and to induce apoptosis potently in AR-positive prostate cancer cells in vitro; it also strongly prevents growth of LNCaP xenografts in mice. The present study describes the unexpectedly strong activity of 11β against the AR-negative HeLa cells, both in cell culture and tumor xenografts, and uncovers a new mechanism of action that likely explains this activity. Cellular fractionation experiments indicated that mitochondria are the major intracellular sink for 11β; flow cytometry studies showed that 11β exposure rapidly induced oxidative stress, mitochondria being an important source of reactive oxygen species (ROS). Additionally, 11β inhibited oxygen consumption both in intact HeLa cells and in isolated mitochondria. Specifically, 11β blocked uncoupled oxygen consumption when mitochondria were incubated with complex I substrates, but it had no effect on oxygen consumption driven by substrates acting downstream of complex I in the mitochondrial electron transport chain. Moreover, 11β enhanced ROS generation in isolated mitochondria, suggesting that complex I inhibition is responsible for ROS production. At the cellular level, the presence of antioxidants (N-acetylcysteine or vitamin E) significantly reduced the toxicity of 11β, implicating ROS production as an important contributor to cytotoxicity. Collectively, our findings establish complex I inhibition and ROS generation as a new mechanism of action for 11β, which supplements conventional DNA adduct formation to promote cancer cell death.

  2. Antidegradation and reinforcement effects of phenyltrimethoxysilane- or N-[3-(trimethoxysilyl)propyl]aniline-modified silica particles in natural rubber composites

    Energy Technology Data Exchange (ETDEWEB)

    Tunlert, Apinya [Program in Petrochemistry and Polymer Science, Chulalongkorn University, Bangkok 10330 (Thailand); Prasassarakich, Pattarapan [Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok 10330 (Thailand); Poompradub, Sirilux, E-mail: sirilux.p@chula.ac.th [Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok 10330 (Thailand); Center for Petroleum, Petrochemical and Advanced Material, Chulalongkorn University Bangkok 10330 (Thailand)

    2016-04-15

    The modification of silica particles with phenyltrimethoxysilane or N-[3-(trimethoxysilyl)propyl]aniline via a sol–gel reaction was performed in order to improve the dispersion of silica and antidegradation in natural rubber (NR). The functional groups on the modified silica surface were characterized by Fourier transform infrared spectroscopy, while the morphology was evaluated by scanning and transmission electron microscopy. The surface properties and antioxidant activity of the modified silica particles were determined by the water contact angle and 2, 2-diphenyl-1-picrylhydrazyl assay, respectively. The modified silica particles exhibited a higher hydrophobicity and a decreased interfacial adhesion energy compared with the unmodified silica particles. The modified silica particles were then incorporated into NR. The better dispersion of the modified silica particles than the unmodified ones in the NR matrix resulted in improved mechanical properties in terms of the modulus at 300% elongation (2.9 ± 0.02 MPa), hardness (52.5 ± 0.2 Shore A), abrasion resistance (241 ± 8 mm{sup 3}) and compression set (20.2 ± 0.6%). In addition, the inclusion of the modified silica particles in the NR matrix gave a high initial temperature of decomposition and retarded the ozone-induced degradation compared with the NR filled with unmodified silica particles. - Highlights: • Silica was surface modified with PhTMS or ATMS via a sol–gel reaction. • Modified silica showed a decreased interfacial adhesion energy. • Modified silica showed an enhanced free radical scavenging activity. • Modified silica improved the mechanical properties, thermal stability and ozone resistance in NR vulcanizates.

  3. Preparation and Characterization of Conducting Polymer Latices by Chemical Polymerization of Aniline or Anisidine in Presence of Latex: Study of Their Electroactivity and Anti-Corrosion Properties

    Directory of Open Access Journals (Sweden)

    Bakhshali Massoumi

    2013-06-01

    Full Text Available Poly (vinylacetate-co-butylmethacrylate was prepared in presence of potassium persulphate as an oxidizing agent in aqueous solution of dodecylbenzene sulfonate sodium as an emulsifying agent. Then, aniline was polymerized by chemical oxidation method at three different concentrations of aniline monomer (0.1, 0.2 and 0.3 M in toluene in presence of poly(vinylacetate-co-butylmethacrylate in order to obtain polyaniline/poly(vinylacetate-co-butylmethacrylate. To prepare conducting-latex of polyanisidine/poly(vinylacetate-co-butylmethacrylate the same method was employed as above for aniline monomer in obtaining conducting polyaniline/poly(vinylacetate-co-butylmethacrylate latex. In addition, the purification of conducting-latex polymers, polyaniline/poly(vinylacetate-co-butylmethacrylate and polyanisidine/poly(vinylacetate-co-butylmethacrylate was conducted and preparation of tin layer films of conducting-latex polymers was carried out by casting method on glassy lames. The electroactivity properties of the prepared latex-polymers, polyaniline/poly(vinylacetate-co-butylmethacrylate and polyanisidine/poly(vinylacetate-co-butylmethacrylate were investigated by cyclic voltammetery (CV. The voltamogrames showed that the latex films were electroactive. Because of conductivity and electroactivity, the obtained films may find applications in anti-corrosion coatings. The anti-corrosion properties of conducting-latex polymers were studied on aluminum surface by impedance technique. The structure of the prepared conducting-latex polymers was confirmed by Fourier transform infrared (FTIR. Finally, the electrical conductivity of synthesized conducting-latex polymers, polyaniline/poly(vinylacetate-co-butylmethacrylate and polyanisidine/poly(vinylacetate-co-butylmethacrylate was measured by four probe technique.

  4. A Copper(II)-Paddlewheel Metal-Organic Framework with Exceptional Hydrolytic Stability and Selective Adsorption and Detection Ability of Aniline in Water.

    Science.gov (United States)

    Chen, Ya; Wang, Bin; Wang, Xiaoqing; Xie, Lin-Hua; Li, Jinping; Xie, Yabo; Li, Jian-Rong

    2017-08-16

    Copper(II)-paddlewheel-based metal-organic frameworks (CP-MOFs) represent a unique subclass of MOFs with highly predictable porous structures, facile syntheses, and functional open metal sites. However, the lack of high hydrolytic stability is an obstacle for CP-MOFs in many practical applications. In this work, we report a new CP-MOF, [Cu 4 (tdhb)] (BUT-155), which is constructed from a judiciously designed carboxylate ligand with high coordination connectivity (octatopic), abundant hydrophobic substituents (six methyl groups), and substituent constrained geometry (tetrahedral backbone), tdhb 8- [H 8 tdhb = 3,3',5,5'-tetrakis(3,5-dicarboxyphenyl)-2,2',4,4',6,6'-hexamethylbiphenyl)]. BUT-155 shows high porosity with a Brunauer-Emmett-Teller surface area of 2070 m 2 /g. Quite interestingly, this CP-MOF retains its structural integrity after being treated in water for 10 days at room temperature or in boiling water for 24 h. To the best of our knowledge, BUT-155 represents the first CP-MOF that is demonstrated to retain its structural integrity in boiling water. The high hydrolytic stability of BUT-155 allowed us to carry out adsorption studies of water vapor and aqueous organic pollutants on it. Water-vapor adsorption reveals a sigmoidal isotherm and a high uptake (46.7 wt %), which is highly reversible and regenerable. In addition, because of the availability of soft-acid-type open Cu(II) sites, BUT-155 shows a high performance for selective adsorption of soft-base-type aniline over water or phenol, and a naked-eye detectable color change for the MOF sample accompanies this. The adsorption selectivity and high adsorption capacity of aniline in BUT-155 are also well-interpreted by single-crystal structures of the water- and aniline-included phases of BUT-155.

  5. Poly (pyrrole-co-aniline) hollow nanosphere supported Pd nanoflowers as high-performance catalyst for methanol electrooxidation in alkaline media

    International Nuclear Information System (INIS)

    Fard, Leyla Abolghasemi; Ojani, Reza; Raoof, Jahan Bakhsh; Zare, Ehsan Nazarzadeh; Lakouraj, Moslem Mansour

    2017-01-01

    In this work, first poly (pyrrole-co-aniline) (PPCA) hollow nanosphere (HN) as a catalyst support material is fabricated through in-situ emulsion polymerization. Then we reported a one-step and template-free approach to fabricate Pd NFs on a PPCA HN coated glassy carbon electrode by a facile electrochemical approach. Several techniques such as FTIR (Fourier transform infrared spectroscopy), SEM (scanning electron microscopy) and EDS (energy dispersive spectroscopy) were utilized for the characterization of the synthesized materials. The catalytic performance of Pd NFs/PPCA HN catalyst is evaluated by cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy toward methanol oxidation as a model reaction in alkaline media. The comparison of specific activities for Pd NFs/PPCA HN (1.79 mA cm"−"2), Pd NFs/PPy (1.28 mA cm"−"2), Pd NFs/PANI (0.93 mA cm"−"2) and Pd NFs (0.78 mA cm"−"2) shows that the PPCA supported Pd NFs with high surface area exhibits the excellent electrocatalytic activity than other electrodes for the electro-oxidation reaction in alkaline media. This might be due to the easier charge transfer at conductive copolymer interfaces, higher electrochemically accessible surface areas and electronic conductivity. This strategy provides a promising platform for direct methanol fuel cells. - Highlights: • Pd nanoflowers supported on poly (pyrrole-co-aniline) hollow nanosphere is prepared by a facile electrochemical approach. • The as-prepared nanocatalyst displays the enhanced electrocatalytic activity and stability for methanol oxidation. • The high performance is attributed to facile electron transfer on poly (pyrrole-co-aniline) hollow nanosphere substrate.

  6. Molecular Structure And Vibrational Frequencies of 2,3,4 Nitro anilines By Hartree-Fock And Density Functional Theory Calculations

    International Nuclear Information System (INIS)

    Sert, Y.

    2008-01-01

    The optimised molecular structure, vibrational frequencies and corresponding vibrational assignments of 2-, 3- and 4- nitro anilines have been calculated using the Hartree-Fock (HF) and density functional methods (B3LYP) with 6-311++G (d, p) basis set. The calculations were adapted to the C S symmetries of all the molecules. The calculated vibrational frequencies and geometric parameters (bond lengths and bond angles) were seen to be in good agreement with the experimental data. The comparison of the experimental and theoretical results showed that the HF method is superior to the B3LYP method for both the vibrational frequencies and geometric parameters

  7. On the electrodeposition of /sup 80m/Br, /sup 80/Br and /sup 82/Br species from (eta, gamma) activated dibromoethane - N,N-dimethyl aniline mixture

    International Nuclear Information System (INIS)

    Zaman, M.R.

    1997-01-01

    Thermal neutron activation have been carried out in dibromomethane (DBM)-n,n-dimethyl aniline (N,N-DMA) system and the /sup 80m/Br, /sup 82/Br species have been electrodeposited on Ag/AgBr electrodes under a constant electric field of 175 volts cm/sup -1/. With the addition of N,N-DMA, anodic deposition has been severely decreased for all the radiobromines and cathode plate shows zero activities. Results are critically discussed by explaining the chemical reactivity of the amine. Electrode deposition pattern and the chemical stabilization mode of the nucleogenic bromine species in this system are deduced to some extents. (author)

  8. Structure and spectroscopic properties of N,S-coordinating 2-methylsulfanyl-N-[(1H-pyrrol-2-ylmethylidene]aniline methanol monosolvate

    Directory of Open Access Journals (Sweden)

    D. Douglas Richards

    2015-10-01

    Full Text Available The reaction of pyrrole-2-carboxaldehyde and 2-(methylsulfanylaniline in refluxing methanol gave an olive-green residue in which yellow crystals of the title compound, C12H12N2S·CH3OH, were grown from slow evaporation of methanol at 263 K. In the crystal, hydrogen-bonding interactions link the aniline molecule and a nearby methanol solvent molecule. These units are linked by a pair of weak C—H...Omethanol interactions, forming inversion dimers consisting of two main molecules and two solvent molecules.

  9. Combustion synthesis by reaction and characterization of nano ferrites: study of fuel aniline, citric and its mixture; Sintese por reacao de combustao e caracterizacao de nanoferritas Ni-Zn: estudo dos combustiveis anilina, acido citrico e sua mistura

    Energy Technology Data Exchange (ETDEWEB)

    Silva, M.C. da; Coutinho, J.P.; Costa, A.C.F.M., E-mail: normanda@ufcg.edu.br [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Unidade Academica de Engenharia de Materiais; Kiminami, R.H.G.A. [Universidade Federal de Sao Carlos (UFSCar), SP (Brazil). Departamento de Engenharia de Materiais; Freitas, N.L. de [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Unidade Academica de Tecnologia do Desenvolvimento

    2012-07-01

    The present study aims to evaluate the influence of aniline and citric acid used alone and combined in a ratio of 50% each in the characterization of NiZn ferrite synthesized by combustion reaction method in a muffle furnace. Measurements were made of temperature and reaction time. The nano-powders were characterized by XRD, EDX, textural analysis and SEM. The highest temperature was achieved by the reaction using the mixture of fuel and increased reaction time using citric acid. The nano ferrites using different fuels, and the mixture changed phases, the crystallite size and decreased surface area of the samples with aniline, citric acid and a mixture of both, respectively. The powder morphology ranged from presenting the formation of irregular blocks for the use of citric agglomerated in the form of skeins with aniline and a mixture to agglomerate larger particles. (author)

  10. Green Synthesis of Ag and Pd Nanospheres, Nanowires, and Nanorods Using Vitamin B2: Catalytic Polymerisation of Aniline and Pyrrole

    Directory of Open Access Journals (Sweden)

    Mallikarjuna N. Nadagouda

    2008-01-01

    Full Text Available For the first time, we report green chemistry approach using vitamin B2 in the synthesis of silver (Ag and palladium (Pd, nanospheres, nanowires, and nanorods at room temperature without using any harmful reducing agents, such as sodium borohydride (NaBH4 or hydroxylamine hydrochloride and any special capping or dispersing agent. Vitamin B2 was used as reducing agent as well as capping agent due to its high-water solubility, biodegradability, and low-toxicity compared with other reducing agents. The average particle size of nanoprticle was found to be Ag (average size 6.1±0.1 nm and Pd (average size 4.1±0.1 nm nanoparticles in ethylene glycol and Ag (average size 5.9±0.1 nm, and average size 6.1±0.1 nanoparticles in acetic acid and NMP, respectively. The formation of noble multiple shape nanostructures and their self assembly were dependent on the solvent employed for the preparation. When water was used as solvent media, Ag and Pd nanoparticles started to self-assemble into rod-like structures and in isopropanol Ag and Pd nanoparticles yielded wire-like structures with a thickness in the range of 10 to 20 nm and several hundred microns in length. In acetone and acetonitrile medium, the Ag and Pd nanoparticles are self-assembled into a regular pattern making nanorod structures with thicknesses ranging from 100 to 200 nm and lengths of a few microns. The so-synthesized nanostructures were characterized using scanning electron microscopy (SEM, transmission electron microscopy (TEM, energy dispersive X-ray (EDX analysis, and UV spectroscopy. The ensuing Ag and Pd nanoparticles catalyzed the reactions of aniline and pyrrole to generate polyaniline and polypyrrole nanofibers and may find various technological and biological applications. This single-step greener approach is general and can be extended to other noble metals and transition metal oxides.

  11. Effects of polymerization and briquetting parameters on the tensile strength of briquettes formed from coal coke and aniline-formaldehyde resin

    Energy Technology Data Exchange (ETDEWEB)

    Demirbas, A.; Simsek, T. [Selcuk University, Konya (Turkey)

    2006-10-15

    In this work, the utilization of aniline (C{sub 6}H{sub 7}N) formaldehyde (HCHO) resins as a binding agent of coke briquetting was investigated. Aniline (AN) formaldehyde (F) resins are a family of thermoplastics synthesized by condensing AN and F in an acid solution exhibiting high dielectric strength. The tensile strength sharply increases as the ratio of F to AN from 0.5 to 1.6, and it reaches the highest values between 1.6 and 2.2 F/AN ratio; it then slightly decreases. The highest tensile strength of F-AN resin-coke briquette (23.66 MN/m{sup 2}) was obtained from the run with 1.5 of F/AN ratio by using (NH4){sub 2}S{sub 2}O{sub 8} catalyst at 310 K briquetting temperature. The tensile strength of F-AN resin-coke briquette slightly decreased with increasing the catalyst percent to 0.10%, and then it sharply decreased to zero with increasing the catalyst percent to 0.2%. The effect of pH on the tensile strength is irregular. As the pH of the mixture increases from 9.0 to 9.2, the tensile strength shows a sharp increase, and the curve reaches a plateau value between pH 9.3 and 9.9; then the tensile strength shows a slight increase after pH = 9.9.

  12. Atomic-Level Organization of Vicinal Acid-Base Pairs through the Chemisorption of Aniline and Derivatives onto Mesoporous SBA15

    KAUST Repository

    Basset, Jean-Marie

    2016-06-09

    The design of novel heterogeneous catalysts with multiple adjacent functionalities is of high interest for heterogeneous catalysis. Herein, we report a method to obtain a majority bifunctional acid-base pairs on SBA15. Aniline reacts with SBA15 by opening siloxane bridges leading to N-phenylsilanamine-silanol pairs. In contrast with ammonia treated surfaces, the material is stable under air/moisture. Advanced solid state MAS NMR: 2D ¹H-¹H double-quantum, ¹H-¹³C HETCOR experiments and dynamic nuclear polarization enhanced ²⁹Si and ¹⁵N spectra demonstrate both the close proximity between the two moieties and the formation of a covalent Si-N surface bond and confirm the design of vicinal acid-base pairs. This approach was successfully applied to the design of a series of aniline derivatives bifunctional SBA15. A correlation of the substituents effects on the aromatic ring (Hammet parameters) on the kinetics of the model reaction of Knoevenagel is observed.

  13. Physicochemical properties of green solvent 1-ethyl-3-methylimidazolium tetrafluoroborate with aniline from T = (293.15 to 323.15) K at atmospheric pressure

    International Nuclear Information System (INIS)

    Srinivasa Rao, V.; Vijaya Krishna, T.; Madhu Mohan, T.; Madhusudana Rao, P.

    2017-01-01

    Highlights: • Nature of interactions in the binary mixture of [Emim][BF 4 ] + aniline are studied. • Excess properties are calculated and correlated using Redlich–Kister equation. • Temperature dependence of the calculated thermophysical propertiesis discussed. - Abstract: Density and speed of sound values are measured for the binary mixture of 1-ethyl-3-methylimidazolium tetrafluoroborate and aniline over the entire range of mole fraction at temperatures from T = (293.15 to 323.15) K under atmospheric pressure. Using the basic experimental results for the molar volume, isentropic compressibility, molar isentropic compressibility, inter molecular free length, excess molar volume, excess isentropic compressibility, excess molar isentropic compressibility and excess intermolecular free length, these values are calculated. The partial molar volumes and partial molar isentropic compressibilities at infinite dilutions have also been calculated. The trends of variation of the properties have been interpreted in light of the solute–solvent interactions occurring in the system. The excess values are fitted to Redlich–Kister polynomial equation to estimate the binary coefficients and standard deviation between the experimental and calculated values. Further, the molecular interactions in the binary mixture system are analysed using the experimental FT-IR spectrum recorded at room temperature.

  14. Rapid and sensitive determination of phenylurea herbicides in water in the presence of their anilines by extraction with a Carbopack cartridge followed by liquid chromatography.

    Science.gov (United States)

    Di Corcia, A; Marchetti, M

    1991-03-22

    A rapid and sensitive method for determining phenylurea herbicides in environmental aqueous samples in the presence of their anilines is described. The water sample is preconcentrated by passage at a flow-rate of ca. 150 ml/min through a 250-mg graphitized carbon black (Carbopack B) cartridge. After washing with 0.6 ml of methanol, the Carbopack B trap is connected with a cartridge containing a strong cation exchanger. Organics trapped by the Carbopack cartridge are eluted by passage of 6 ml of methylene chloride-methanol (95:5, v/v). Anilines and other basic compounds are quantitatively subtracted from the solvent system while flowing through the cation-exchange cartridge. After evaporation and redissolution, the sample is subjected to reversed-phase gradient elution high-performance liquid chromatography with UV detection at 250 nm. Recoveries of phenylureas added to water at levels between 30 and 3000 ng/l were higher than 92%. The limit of detection was about 1 ng/l, for a 2-1 sample. With respect to an octadecyl (C18)-bonded silica cartridge, the Carbopack B cartridge had a far better extraction efficiency for polar phenylureas.

  15. 4-N, N-bis(4-methoxylphenyl) aniline substituted anthraquinone: X-ray crystal structures, theoretical calculations and third-order nonlinear optical properties

    Science.gov (United States)

    Xu, Liang; Zhang, Dingfeng; Zhou, Yecheng; Zheng, Yusen; Cao, Liu; Jiang, Xiao-Fang; Lu, Fushen

    2017-08-01

    In this paper, mono- and di-4-N,N-bis(4-methoxylphenyl)aniline-substituted anthraquinone have been designed and synthesized through Suzuki reaction. For mono-4-N,N-bis(4-methoxylphenyl)aniline-substituted anthraquinone, polymorphous crystal structures have been obtained in different crystallization conditions. Electrochemical characterization combined with theoretical calculation suggests that the addition of a second triphenylamine unit causes a larger band gap with higher lying LUMO (Lowest Unoccupied Molecular Orbital) and HOMO (Highest Occupied Molecular Orbital). The linear optical property shows that the introduction of a second triphenylamine unit bring about a significant hyperchromic effect with the extinction coefficients increasing from 11199 M-1 cm-1 to 22136 M-1 cm-1. The third-order nonlinear optical properties indicate that the introduction of a second triphenylamine unit lead to a much larger nonlinear absorption coefficient and two-photon absorption cross section, with the relevant value increasing from 2.04 × 10-12 cm W-1 to 3.91 × 10-12 cm W-1, and from 148 GM to 286 GM, respectively.

  16. Determination of the solid surface critical exponent β{sub 1} from contact-angle variation on approach to a wetting transition: Cyclohexane/aniline/quartz

    Energy Technology Data Exchange (ETDEWEB)

    Pallas, Norman R., E-mail: Sam-7-iam@hotmail.com [BP Research Centre Warrensville, 4440 Warrensville Center Road, Cleveland, Ohio 44128 (United States)

    2016-03-21

    The three-phase contact angle (θ) for the system cyclohexane/aniline/quartz has been measured from drop shapes as a function of temperature on approach to the cyclohexane/aniline upper consolute solution temperature T{sub c}. The experiments employed exacting criteria previously established for thermodynamic-quality measurements at fluid interfaces. A first-order wetting transition from partial wetting to complete wetting was observed at a temperature T{sub w}, 2.12 K below T{sub c}. The contact angle vanishes at T{sub w}, scaling as cos θ ∼ |T − T{sub c}|{sup β{sub 1}−μ} for T < T{sub w} and cos θ = 1.0 for T{sub w} < T < T{sub c}. The experimental results give a value for β{sub 1} = 0.74 ± 0.03, in agreement with theoretical calculations. The data clearly rule out higher order contributions to the change in the contact angle near the critical point for this system. These results are in marked contrast to previous measurements on this system from measurements of capillary rise and meniscus curvature.

  17. Solvent-free and room temperature synthesis of 3-arylquinolines from different anilines and styrene oxide in the presence of Al2O3/MeSO3H

    Directory of Open Access Journals (Sweden)

    Hashem Sharghi

    2017-09-01

    Full Text Available A highly efficient, simple and environmentally friendly synthesis of 3-arylquinolines has been developed in the presence of Al2O3/MeSO3H via one-pot reaction of anilines and styrene oxide. This methodology provides very rapid access to 3-arylquinolines in good to excellent yields under solvent-free conditions at room temperature in air.

  18. Aniline incorporated silica nanobubbles

    Indian Academy of Sciences (India)

    Unknown

    2006-09-14

    Sep 14, 2006 ... (D) The fusion of two carbon onion structures. .... Figure 2. TEM images showing the fusion of Au@SiO2. ... actions of the fluorophore with the solvent. There are two .... thought of looking at some other parameters such as.

  19. Sub micrometric fibrillar structures of codoped poly aniline obtained by co-oxidation using the NaCl O/ammonium peroxydisulfate system: synthesis and characterization

    Energy Technology Data Exchange (ETDEWEB)

    Osorio F, J. E.; Gomez Y, C.; Hernandez P, M. A.; Corea T, M. L., E-mail: josorio@ipn.mx [IPN, Escuela Superior de Ingenieria Quimica e Industrias Extractivas, U. P. Adolfo Lopez Mateos, Av. Instituto Politecnico Nacional s/n, Col. San Pedro Zacatenco, 07738 Mexico D. F. (Mexico)

    2013-07-01

    A mixture of ammonium peroxydisulfate and sodium hypochlorite (NaCl O) (co-oxi dating system) were used to obtain poly aniline (PANi) doped with HCl and camphorsulfonic acid (CsA) (co-doping). The effect of HCl/CsA ratio added during polymerization structure, morphology and electrical conductivity of the conducting polymer was investigated. When NaCl O is used, the polymerization rate is substantially increased and the morphology changes from micrometric granular to nano metric fibrillar. CsA was used as complementary dopant but also to improve the solubility of PANi in common solvents. However, results suggest that quinone-like heterocycles containing carbonyl radicals as well as phenazine-type aromatic rings might be impeding an efficient doping in detriment of the conductivity. For the characterization X-Ray diffraction analysis, UV visible spectroscopy and scanning electron microscopy were used. (Author)

  20. Batch wise removal of chromium (vi) by adsorption on novel synthesized poly aniline composites with various brans and iso thermal modeling of equilibrium data

    International Nuclear Information System (INIS)

    Kanwal, F.; Rehman, R.; Anwar, J.; Saeed, M.

    2012-01-01

    Summary: Several novel adsorbents have been investigated now-a-days for removal of poisonous substances from waste water. In this research work, poly aniline composites with rice bran, maize bran and wheat bran had been synthesized and applied for the adsorption of Cr(Vi) from waste water. Morphological changes occurring in the surface of composites were characterized by recording their FT-IR spectra. Rice bran, maize bran and wheat bran modified the surface morphology of polyaniline by preventing the aggregation of monomers resulting in improved adsorption capacity. Operational conditions were optimized and applied to Langmuir and Freundlich isotherms for investigating the adsorption mechanism and maximum sorption capacity. Thermodynamic studies positively showed the feasibleness of these adsorbents for the removal of Cr(Vi). (author)

  1. Solvent Dependency in the Quantum Efficiency of 4-[(4-Aminophenyl)-(4-imino-1-cyclohexa-2, 5- dienylidene) methyl] Aniline Hydrochloride.

    Science.gov (United States)

    Pathrose, Bini; Nampoori, V P N; Radhakrishnan, P; Sahira, H; Mujeeb, A

    2015-05-01

    In the present work dual beam thermal lens technique is used for studying the solvent dependency on the quantum efficiency of a novel dye used for biomedical applications. The role of solvent in the absolute fluorescence quantum yield of 4-[(4-Aminophenyl)-(4-imino-1-cyclohexa-2, 5- dienylidene) methyl] aniline hydrochloride is studied using thermal lens technique. It is observed that the variation in solvents and its concentration results considerable variations in the fluorescence quantum yield. These variations are due to the non-radiative relaxation of the absorbed energy and because of the different solvent properties. The highest quantum yield of the dye is observed in the polar protic solvent-water.

  2. Sub micrometric fibrillar structures of codoped poly aniline obtained by co-oxidation using the NaCl O/ammonium peroxydisulfate system: synthesis and characterization

    International Nuclear Information System (INIS)

    Osorio F, J. E.; Gomez Y, C.; Hernandez P, M. A.; Corea T, M. L.

    2013-01-01

    A mixture of ammonium peroxydisulfate and sodium hypochlorite (NaCl O) (co-oxi dating system) were used to obtain poly aniline (PANi) doped with HCl and camphorsulfonic acid (CsA) (co-doping). The effect of HCl/CsA ratio added during polymerization structure, morphology and electrical conductivity of the conducting polymer was investigated. When NaCl O is used, the polymerization rate is substantially increased and the morphology changes from micrometric granular to nano metric fibrillar. CsA was used as complementary dopant but also to improve the solubility of PANi in common solvents. However, results suggest that quinone-like heterocycles containing carbonyl radicals as well as phenazine-type aromatic rings might be impeding an efficient doping in detriment of the conductivity. For the characterization X-Ray diffraction analysis, UV visible spectroscopy and scanning electron microscopy were used. (Author)

  3. Removal of organic micro-pollutants (phenol, aniline and nitrobenzene) via forward osmosis (FO) process: Evaluation of FO as an alternative method to reverse osmosis (RO).

    Science.gov (United States)

    Cui, Yue; Liu, Xiang-Yang; Chung, Tai-Shung; Weber, Martin; Staudt, Claudia; Maletzko, Christian

    2016-03-15

    In this study, we have explored and compared the effectiveness of using (1) lab-fabricated forward osmosis (FO) membranes under both FO and reverse osmosis (RO) modes and (2) commercially available RO membranes under the RO mode for the removal of organic micro-pollutants. The lab-fabricated FO membranes are thin film composite (TFC) membranes consisting of a polyamide layer and a porous substrate cast from three different materials; namely, Matrimid, polyethersulfone (PESU) and sulfonated polyphenylene sulfone (sPPSU). The results show that the FO mode is superior to the RO mode in the removal of phenol, aniline and nitrobenzene from wastewater. The rejections of all three TFC membranes to all the three organic micro-pollutants under the FO processes are higher than 72% and can be even higher than 90% for aniline when a 1000 ppm aromatic aqueous solution and 1 M NaCl are employed as feeds. These performances outperform the results obtained from themselves and commercially available RO membranes under the RO mode. In addition, the rejection can be maintained even when treating a more concentrated feed solution (2000 ppm). The removal performance can be further enhanced by using a more concentrated draw solution (2 M). The water flux is almost doubled, and the rejection increment can reach up to 17%. Moreover, it was observed that annealing as a post-treatment would help compact the membrane selective layer and further enhance the separating efficiency. The obtained organic micro-pollutant rejections and water fluxes under various feasible operating conditions indicate that the FO process has potential to be a viable treatment for wastewater containing organic micro-pollutants. Copyright © 2016 Elsevier Ltd. All rights reserved.

  4. Removal of organic micro-pollutants (phenol, aniline and nitrobenzene) via forward osmosis (FO) process: Evaluation of FO as an alternative method to reverse osmosis (RO)

    KAUST Repository

    Cui, Yue

    2016-01-05

    In this study, we have explored and compared the effectiveness of using (1) lab-fabricated forward osmosis (FO) membranes under both FO and reverse osmosis (RO) modes and (2) commercially available RO membranes under the RO mode for the removal of organic micro-pollutants. The lab-fabricated FO membranes are thin film composite (TFC) membranes consisting of a polyamide layer and a porous substrate cast from three different materials; namely, Matrimid, polyethersulfone (PESU) and sulfonated polyphenylene sulfone (sPPSU). The results show that the FO mode is superior to the RO mode in the removal of phenol, aniline and nitrobenzene from wastewater. The rejections of all three TFC membranes to all the three organic micro-pollutants under the FO processes are higher than 72% and can be even higher than 90% for aniline when a 1000 ppm aromatic aqueous solution and 1 M NaCl are employed as feeds. These performances outperform the results obtained from themselves and commercially available RO membranes under the RO mode. In addition, the rejection can be maintained even when treating a more concentrated feed solution (2000 ppm). The removal performance can be further enhanced by using a more concentrated draw solution (2 M). The water flux is almost doubled, and the rejection increment can reach up to 17%. Moreover, it was observed that annealing as a post-treatment would help compact the membrane selective layer and further enhance the separating efficiency. The obtained organic micro-pollutant rejections and water fluxes under various feasible operating conditions indicate that the FO process has potential to be a viable treatment for wastewater containing organic micro-pollutants.

  5. Liquid-phase pulsed laser ablation synthesis of graphitized carbon-encapsulated palladium core–shell nanospheres for catalytic reduction of nitrobenzene to aniline

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Yu-jin; Ma, Rory; Reddy, D. Amaranatha; Kim, Tae Kyu, E-mail: tkkim@pusan.ac.kr

    2015-12-01

    Graphical abstract: - Highlights: • Graphitized carbon-encapsulated palladium core–shell nanospheres fabricated by laser ablation. • Physical characterizations of synthesized Pd@C nanospheres. • Assessments of catalytic performance of Pd@C nanospheres for the reduction of nitrobenzene to aniline. • Significant improvement of the catalytic activity due to the graphitized carbon-layered structure and the high specific surface area. - Abstract: Graphitized carbon-encapsulated palladium (Pd) core–shell nanospheres were produced via pulsed laser ablation of a solid Pd foil target submerged in acetonitrile. The microstructural features and optical properties of these nanospheres were characterized via high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-visible spectroscopy. Microstructural analysis indicated that the core–shell nanostructures consisted of single-crystalline cubic metallic Pd spheres that serve as the core material, over which graphitized carbon was anchored as a heterogeneous shell. The absorbance spectrum of the synthesized nanostructures exhibited a broad (absorption) band at ∼264 nm; this band corresponded to the typical inter-band transition of a metallic system and resulted possibly from the absorbance of the ionic Pd{sup 2+}. The catalytic properties of the Pd and Pd@C core–shell nanostructures were investigated using the reduction of nitrobenzene to aniline by an excess amount of NaBH{sub 4} in an aqueous solution at room temperature, as a model reaction. Owing to the graphitized carbon-layered structure and the high specific surface area, the resulting Pd@C nanostructures exhibited higher conversion efficiencies than their bare Pd counterparts. In fact, the layered structure provided access to the surface of the Pd nanostructures for the hydrogenation reaction, owing to the synergistic effect between graphitized carbon and the nanostructures. Their

  6. Liquid-phase pulsed laser ablation synthesis of graphitized carbon-encapsulated palladium core–shell nanospheres for catalytic reduction of nitrobenzene to aniline

    International Nuclear Information System (INIS)

    Kim, Yu-jin; Ma, Rory; Reddy, D. Amaranatha; Kim, Tae Kyu

    2015-01-01

    Graphical abstract: - Highlights: • Graphitized carbon-encapsulated palladium core–shell nanospheres fabricated by laser ablation. • Physical characterizations of synthesized Pd@C nanospheres. • Assessments of catalytic performance of Pd@C nanospheres for the reduction of nitrobenzene to aniline. • Significant improvement of the catalytic activity due to the graphitized carbon-layered structure and the high specific surface area. - Abstract: Graphitized carbon-encapsulated palladium (Pd) core–shell nanospheres were produced via pulsed laser ablation of a solid Pd foil target submerged in acetonitrile. The microstructural features and optical properties of these nanospheres were characterized via high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-visible spectroscopy. Microstructural analysis indicated that the core–shell nanostructures consisted of single-crystalline cubic metallic Pd spheres that serve as the core material, over which graphitized carbon was anchored as a heterogeneous shell. The absorbance spectrum of the synthesized nanostructures exhibited a broad (absorption) band at ∼264 nm; this band corresponded to the typical inter-band transition of a metallic system and resulted possibly from the absorbance of the ionic Pd 2+ . The catalytic properties of the Pd and Pd@C core–shell nanostructures were investigated using the reduction of nitrobenzene to aniline by an excess amount of NaBH 4 in an aqueous solution at room temperature, as a model reaction. Owing to the graphitized carbon-layered structure and the high specific surface area, the resulting Pd@C nanostructures exhibited higher conversion efficiencies than their bare Pd counterparts. In fact, the layered structure provided access to the surface of the Pd nanostructures for the hydrogenation reaction, owing to the synergistic effect between graphitized carbon and the nanostructures. Their unique

  7. Localization of sites modified during inactivation of the bovine heart mitochondrial F1-ATPase by quinacrine mustard using [3H]aniline as a probe

    International Nuclear Information System (INIS)

    Bullough, D.A.; Ceccarelli, E.A.; Verburg, J.G.; Allison, W.S.

    1989-01-01

    The aziridinium of purified quinacrine mustard at 50 microM inactivates the bovine heart mitochondrial F1-ATPase with a pseudo-first order rate constant of 0.07 min-1 at pH 7.0 and 23 degrees C. An apparent Kd of 27 microM for the enzyme-reagent complex was estimated from the dependence of the rate of inactivation on the concentration of quinacrine mustard. The pH inactivation profile revealed that deprotonation of a group with a pKa of about 6.7 is necessary for inactivation. The amount of reagent incorporated into the protein increased linearly with the extent of inactivation. Complete inactivation was estimated to occur when 3 mol of reagent were incorporated/mol of F1. Enzyme, in which steady state ATPase was inactivated by 98% by quinacrine mustard, hydrolyzed substoichiometric ATP with zero order kinetics suggesting that residual activity is catalyzed by F1 in which at least one beta subunit is modified. By exploiting the reactivity of the aziridinium of covalently attached reagent with [3H] aniline, sites modified by quinacrine mustard were labeled with 3H. Isolation of radioactive cyanogen bromide peptides derived from F1 inactivated with the reagent in the presence of [3H]aniline which were identified by sequence analysis and sequence analyses of radioactive tryptic fragments arising from them have revealed the following. About two thirds of the radioactivity incorporated into the enzyme during inactivation is apparently esterified to one or more of the carboxylic acid side chains in a CNBr-tryptic fragment of the beta subunit with the sequence: 394DELSEEDK401. The remainder of the radioactivity is associated with at least two sites within the cyanogen bromide peptide containing residues 293-358 of the beta subunit

  8. Delineation of G-Quadruplex Alkylation Sites Mediated by 3,6-Bis(1-methyl-4-vinylpyridinium iodide)carbazole-Aniline Mustard Conjugates.

    Science.gov (United States)

    Chen, Chien-Han; Hu, Tsung-Hao; Huang, Tzu-Chiao; Chen, Ying-Lan; Chen, Yet-Ran; Cheng, Chien-Chung; Chen, Chao-Tsen

    2015-11-23

    A new G-quadruplex (G-4)-directing alkylating agent BMVC-C3M was designed and synthesized to integrate 3,6-bis(1-methyl-4-vinylpyridinium iodide)carbazole (BMVC) with aniline mustard. Various telomeric G-4 structures (hybrid-2 type and antiparallel) and an oncogene promoter, c-MYC (parallel), were constructed to react with BMVC-C3M, yielding 35 % alkylation yield toward G-4 DNA over other DNA categories (alkylation adducts by electrospray ionization mass spectroscopy (ESI-MS) revealed the stepwise DNA alkylation mechanism of aniline mustard for the first time. Furthermore, the monoalkylation sites and intrastrand cross-linking sites were determined and found to be dependent on G-4 topology based on the results of footprinting analysis in combination with mass spectroscopic techniques and in silico modeling. The results indicated that BMVC-C3M preferentially alkylated at A15 (H26), G12 (H24), and G2 (c-MYC), respectively, as monoalkylated adducts and formed A15-C3M-A21 (H26), G12-C3M-G4 (H24), and G2-C3M-G4/G17 (c-MYC), respectively, as cross-linked dialkylated adducts. Collectively, the stability and site-selective cross-linking capacity of BMVC-C3M provides a credible tool for the structural and functional characterization of G-4 DNAs in biological systems. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  9. Study of the rearrangement of N-alkylanilines to P-aminoalkylbencene. III. N-n-propil-l-14{sup C} aniline; Estudio de la transposicion de N-Alquilanilinas a p-Aminoalquibenceno mediante 14{sup C}. III. N-n Propilanilina

    Energy Technology Data Exchange (ETDEWEB)

    Molera, J M; Gamboa, J M; Val del Cob, M; Ortin, N

    1964-07-01

    The rearrangement of N-n-propyl aniline to p-amino propylbenzene has been studied at 250 degree centigrade using several catalysts: CoCl{sub 2}, ZnCl{sub 2} and HBr. N-propyl-1-14{sup C}-aniline has been synthesized from sodium propionate-1-14{sup C} through conversion to n-propyl-1-14{sup C}-iodide and further reaction with aniline. After the rearrangement and among the reaction products both p-aminopropylbenzene and p-aminoisopropylbencene were found. To determine the 14{sup C} position in both the starting aniline and reaction products two degradation schemes are followed. In the light of experimental evidence a mechanism is set forth based on the assumption of an organic cation as intermediate. (Author) 13 refs.

  10. Effect of methyl substituents on the electronic transitions in simple meso-aniline-BODIPY based dyes: RI-CC2 and TD-CAM-B3LYP computational investigation

    Science.gov (United States)

    Petrushenko, Igor K.; Petrushenko, Konstantin B.

    2018-02-01

    The S0 → Si, i = 1-5 electronic transitions of four 8-(4-aniline)-BODIPY and four 8-(N,N-dimethyl)-BODIPY dyes, differ by number and position of methyl substituents in the BODIPY frame, were investigated theoretically using ab initio the coupled cluster doubles (CC2) and TD-CAM-B3LYP methods. Methyl substituents in the BODIPY frame and the aniline fragment at the meso position disturb energy of local excitations S0 → S1, S0 → S3, and S0 → S4 weakly in comparison with the fully unsubstituted BODIPY molecule. These transitions in experimental spectra form the most long-wave absorption bands at ca. 500 nm as well as absorption bands in the region of 300-400 nm. At the same time, the presence of aniline fragments leads to the appearance of new S0 → S2 transitions of the charge transfer character in electronic spectra of BODIPYs. We also found a linear relationship between vertical energy of these charge transfer transitions and the electron donating power of an aniline fragment and electron accepting power of the BODIPY core depending on the number and position of methyl groups. The CC2 method provides the best overall description of the excitation energies in line with the experimental observations. On average, the quality of TD-CAM-B3LYP is almost equal to that of CC2, however the TD method with the CAM-B3LYP functional slightly underestimates the CT excitation energy.

  11. Novel amphiphilic polymeric ionic liquid-solid phase micro-extraction membrane for the preconcentration of aniline as degradation product of azo dye Orange G under sonication by liquid chromatography-tandem mass spectrometry.

    Science.gov (United States)

    Cai, Mei-Qiang; Wei, Xiao-Qing; Du, Chun-Hui; Ma, Xu-Ming; Jin, Mi-Cong

    2014-07-04

    A novel amphiphilic polymeric ionic liquid membrane containing a hydrophilic bromide anion and a hydrophobic carbonyl group was synthesized in dimethylformamide (DMF) systems using the ionic liquid 1-butyl-3-vinylimidazolium bromide (BVImBr) and the methylmethacrylate (MMA) as monomers. The prepared amphiphilic ploy-methylmethacrylate-1-butyl-3-vinylimidazolium bromide (MMA-BVImBr) was characterized by a scanning electron microscope and an infrared spectrum instrument. The results of solid-phase micro-extraction membrane (SPMM) experiments showed that the adsorption capacity of membrane was about 0.76μgμg(-1) for aniline. Based on this, a sensitive method for the determination of trace aniline, as a degradation product of azo dye Orange G under sonication, was developed by liquid chromatography-tandem mass spectrometry (LC-MS/MS). The calibration curve showed a good linearity ranging from 0.5 to 10.0μgL(-1) with a correlation coefficient value of 0.9998. The limit of quantification was 0.5μgL(-1). The recoveries ranged from 90.6% to 96.1%. The intra- and inter-day relative standard deviations were less than 8.3% and 10.9%. The developed SPMM-LC-MS/MS method was used successfully for preconcentration of trace aniline produced during the sonication of Orange G solution. Copyright © 2014 Elsevier B.V. All rights reserved.

  12. Photocatalytic Degradation of Eosin Yellow Using Poly(pyrrole-co-aniline-Coated TiO2/Nanocellulose Composite under Solar Light Irradiation

    Directory of Open Access Journals (Sweden)

    T. S. Anirudhan

    2015-01-01

    Full Text Available The present study describes the feasibility of a novel adsorbent cum photocatalyst, poly(pyrrole-co-aniline-coated TiO2/nanocellulose composite (P(Py-co-An-TiO2/NCC, to remove eosin yellow (EY from aqueous solutions. The removal of EY was investigated by batch adsorption followed by photocatalysis. The effect of various adsorption parameters like adsorbent dose, pH, contact time, initial concentration, and ionic strength has been optimized for treating effluents from the dye industry. Adsorption of EY reached maximum at pH 4.5 and complete removal of dye was achieved using 3.5 g/L of P(Py-co-An-TiO2/NCC. Adsorption equilibrium data were fitted with Langmuir and Fritz-Schlunder isotherm models and the kinetics of adsorption follows a second-order mechanism. The adsorption capacity of P(Py-co-An-TiO2/NCC was found to be 3.39 × 10−5 mol/g and reached equilibrium within 90 min. The photocatalytic degradation of adsorbed dye under sunlight was possible and about 92.3% of dye was degraded within 90 min. The reusability of P(Py-co-An-TiO2/NCC was also investigated. The results indicate that P(Py-co-An-TiO2/NCC is the best material for the wiping out of EY from aqueous solutions.

  13. The fate of aniline after a photo-fenton reaction in an aqueous system containing iron(III), humic acid, and hydrogen peroxide

    Energy Technology Data Exchange (ETDEWEB)

    Fukushima, Masami; Tatsumi, Kenji; Morimoto, Kengo

    2000-05-15

    The degradation of aniline (ArNH{sub 2}) was facilitated by light irradiation ({lambda} > 370 nm) of an aqueous solution, which contained Fe(III), humic acid(HA), and H{sub 2}O{sub 2}. The consumption of H{sub 2}O{sub 2} and the reduction of Fe(III) to Fe(II) was consistent with the degradation of ArNH{sub 2} via the photo-Fenton reaction, accompanied by the generation of hydroxyl radicals (HO{sm_bullet}). HPLC analysis of the reaction mixture indicated the presence of p-aminophenol, p-hydroquinone, and maleic and fumaric acids and the simultaneous release of NH{sub 4}{sup +} ion. However, the sum of the product concentrations, as determined by HPLC after the reaction, was much smaller than the ArNH{sub 2} concentration added initially. This can be attributed to the majority of the ArNH{sub 2} being incorporated into the polymeric structure in the HA after the reaction. The {sup 15}N NMR and pyrolysis-GC/MS studies indicated that, after the reaction, ArNH{sub 2} formed covalent bonds with quinone and the vinyl carbons in the HA, to form anilino-compounds, such as anilinoquinone and enaminone.

  14. FTIR spectroscopic study on the Hofmann -Td- type clathrates: Ni(benzoic acid)2M(CN)4.aniline (M=Zn, Cd, Hg)

    International Nuclear Information System (INIS)

    Kesan, G.; Kartal, Z.

    2010-01-01

    The Hofmann-Td-type clathrates formulated as Ni(L) 2 M(CN) 4 .nG where L is a bidentate or a pair of unidentate ligand molecule, M is Zn, Cd or Hg, G is a guest molecule and n is the number of guest molecule. The host lattice of the Hofmann-Td-type clathrates is formed from endless chains of -Ni-L-L-Ni-L-L-Ni- and M(CN) 4 ions arranged between the consecutive crossing -Ni-L-L-Ni-L-L-Ni- chains with the O-ends bound to the Ni metal atoms. These polymeric layers are held in parallel by Van der Walls interaction between ligand molecules. This structure provides α-type cavity. In this study, Ni(Benzoic Acid ) 2M(CN) 4 .Aniline (M = Zn, Cd, Hg) is obtained for the first time by means of chemical methods in powder form and their infrared spectra are reported in range of (4000-400) cm - 1. The spectral data suggest that the new clathrates are similar in structure to the Hofmann-type clathrates.

  15. Liquid-phase pulsed laser ablation synthesis of graphitized carbon-encapsulated palladium core-shell nanospheres for catalytic reduction of nitrobenzene to aniline

    Science.gov (United States)

    Kim, Yu-jin; Ma, Rory; Reddy, D. Amaranatha; Kim, Tae Kyu

    2015-12-01

    Graphitized carbon-encapsulated palladium (Pd) core-shell nanospheres were produced via pulsed laser ablation of a solid Pd foil target submerged in acetonitrile. The microstructural features and optical properties of these nanospheres were characterized via high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-visible spectroscopy. Microstructural analysis indicated that the core-shell nanostructures consisted of single-crystalline cubic metallic Pd spheres that serve as the core material, over which graphitized carbon was anchored as a heterogeneous shell. The absorbance spectrum of the synthesized nanostructures exhibited a broad (absorption) band at ∼264 nm; this band corresponded to the typical inter-band transition of a metallic system and resulted possibly from the absorbance of the ionic Pd2+. The catalytic properties of the Pd and Pd@C core-shell nanostructures were investigated using the reduction of nitrobenzene to aniline by an excess amount of NaBH4 in an aqueous solution at room temperature, as a model reaction. Owing to the graphitized carbon-layered structure and the high specific surface area, the resulting Pd@C nanostructures exhibited higher conversion efficiencies than their bare Pd counterparts. In fact, the layered structure provided access to the surface of the Pd nanostructures for the hydrogenation reaction, owing to the synergistic effect between graphitized carbon and the nanostructures. Their unique structure and excellent catalytic performance render Pd@C core-shell nanostructures highly promising candidates for catalysis applications.

  16. Experimental and theoretical investigation on the molecular structure, spectroscopic and electric properties of 2,4-dinitrodiphenylamine, 2-nitro-4-(trifluoromethyl)aniline and 4-bromo-2-nitroaniline

    Science.gov (United States)

    Hernández-Paredes, Javier; Hernández-Negrete, Ofelia; Carrillo-Torres, Roberto C.; Sánchez-Zeferino, Raúl; Duarte-Moller, Alberto; Alvarez-Ramos, Mario E.

    2015-10-01

    2,4-Dinitrodiphenylamine (I), 2-nitro-4-(trifluoromethyl)aniline (II) and 4-bromo-2-nitroaniline (III) have been investigated by DFT and experimental FTIR, Raman and UV-Vis spectroscopies. The gas-phase molecular geometries were consistent with similar compounds already reported in the literature. From the vibrational analysis, the main functional groups were identified and their absorption bands were assigned. Some differences were found between the calculated and the experimental UV-Vis spectra. These differences were analyzed and explained in terms of the TD-DFT/B3LYP limitations, which were mainly attributed to charge-transfer (CT) effects. These findings were in agreement with previous works, which reported that TD-DFT/B3LYP calculations diverge from experimental results when the electronic transitions involve CT. Despite this, TD-DFT/B3LYP calculations provided satisfactory results and a detailed description of the electronic transitions involved in the absorption bands of the UV-Vis spectra. In terms of the NLO properties, it was found that compound (I) is a good candidate for NLO applications and deserves further study due to its good β values. However, the β values for compounds (II) and (III) were negatively affected compared to those found on o-nitroaniline.

  17. Development of a reagentless electrochemiluminescent electrode for flow injection analysis using copolymerised luminol/aniline on nano-TiO2 functionalised indium-tin oxide glass.

    Science.gov (United States)

    Liu, Chao; Wei, Xiuhua; Tu, Yifeng

    2013-07-15

    In this study, a nano-structured copolymer of luminol/aniline (PLA) was deposited onto nano-TiO2-functionalised indium tin oxide (ITO)-coated glass by electrochemical polymerisation using cyclic voltammetry (CV). The resulting reagentless electrochemiluminescent (ECL) electrode (ECLode) can be used for flow injection analysis (FIA). The properties of the ECLode were characterised by CV, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). The ECLode has high background ECL emission as well as excellent stability and reproducibility, and yielding sensitive response towards target analytes. The ECL emissions of the ECLode were 50 times higher than PLA/ITO, and 500 times higher than polyluminol (PL)/ITO. The ECLode showed sensitive responses to reactive oxygen species (ROSs), permitting its application for determination of antioxidants by quenching. Under optimised conditions, an absolute detection limit of 69.9 pg was obtained for resveratrol, comparable to the highest levels of sensitivity achieved by other methods. Thus, the gross antioxidant content of red wine was determined, with satisfactory recoveries between 87.6% and 108.3%. These results suggest a bright future for the use of the ECLode for single-channel FIA due to its high sensitivity, accuracy and reproducibility. Copyright © 2013 Elsevier B.V. All rights reserved.

  18. Benzothiazole aniline tetra(ethylene glycol) and 3-amino-1,2,4-triazole inhibit neuroprotection against amyloid peptides by catalase overexpression in vitro.

    Science.gov (United States)

    Chilumuri, Amrutha; Odell, Mark; Milton, Nathaniel G N

    2013-11-20

    Alzheimer's disease, Familial British dementia, Familial Danish dementia, Type 2 diabetes mellitus, plus Creutzfeldt-Jakob disease are associated with amyloid fibril deposition and oxidative stress. The antioxidant enzyme catalase is a neuroprotective amyloid binding protein. Herein the effects of catalase overexpression in SH-SY5Y neuronal cells on the toxicity of amyloid-β (Aβ), amyloid-Bri (ABri), amyloid-Dan (ADan), amylin (IAPP), and prion protein (PrP) peptides were determined. Results showed catalase overexpression was neuroprotective against Aβ, ABri, ADan, IAPP, and PrP peptides. The catalase inhibitor 3-amino-1,2,4-triazole (3-AT) and catalase-amyloid interaction inhibitor benzothiazole aniline tetra(ethylene glycol) (BTA-EG4) significantly enhanced neurotoxicity of amyloid peptides in catalase overexpressing neuronal cells. This suggests catalase neuroprotection involves breakdown of hydrogen peroxide (H2O2) plus a direct binding interaction between catalase and the Aβ, ABri, ADan, IAPP, and PrP peptides. Kisspeptin 45-50 had additive neuroprotective actions against the Aβ peptide in catalase overexpressing cells. The effects of 3-AT had an intracellular site of action, while catalase-amyloid interactions had an extracellular component. These results suggest that the 3-AT and BTA-EG4 compounds may be able to inhibit endogenous catalase mediated neuroprotection. Use of BTA-EG4, or compounds that inhibit catalase binding to amyloid peptides, as potential therapeutics for Neurodegenerative diseases may therefore result in unwanted effects.

  19. Poly(aniline) nanowires in sol-gel coated ITO: A pH-responsive substrate for planar supported lipid bilayers

    Science.gov (United States)

    Ge, Chenhao; Orosz, Kristina S.; Armstrong, Neal R.; Saavedra, S. Scott

    2011-01-01

    Facilitated ion transport across an artificial lipid bilayer coupled to a solid substrate is a function common to several types of bioelectronic devices based on supported membranes, including biomimetic fuel cells and ion channel biosensors. Described here is fabrication of a pH-sensitive transducer composed of a porous sol-gel layer derivatized with poly(aniline) (PANI) nanowires grown from an underlying planar indium-tin oxide (ITO) electrode. The upper sol-gel surface is hydrophilic, smooth, and compatible with deposition of a planar supported lipid bilayer (PSLB) formed via vesicle fusion. Conducting tip AFM was used to show that the PANI wires are connected to the ITO, which convert this electrode into a potentiometric pH sensor. The response to changes in the pH of the buffer contacting the PANI nanowire/sol-gel/ITO electrode is blocked by the very low ion permeability of the overlying, fluid PSLB. The feasibility of using this assembly to monitor facilitated proton transport across the PSLB was demonstrated by doping the membrane with lipophilic ionophores that respond to a transmembrane pH gradient, which produced an apparent proton permeability several orders of magnitude greater than values measured for undoped lipid bilayers. PMID:21707069

  20. Benzothiazole Aniline Tetra(ethylene glycol) and 3-Amino-1,2,4-triazole Inhibit Neuroprotection against Amyloid Peptides by Catalase Overexpression in Vitro

    Science.gov (United States)

    2013-01-01

    Alzheimer’s disease, Familial British dementia, Familial Danish dementia, Type 2 diabetes mellitus, plus Creutzfeldt-Jakob disease are associated with amyloid fibril deposition and oxidative stress. The antioxidant enzyme catalase is a neuroprotective amyloid binding protein. Herein the effects of catalase overexpression in SH-SY5Y neuronal cells on the toxicity of amyloid-β (Aβ), amyloid-Bri (ABri), amyloid-Dan (ADan), amylin (IAPP), and prion protein (PrP) peptides were determined. Results showed catalase overexpression was neuroprotective against Aβ, ABri, ADan, IAPP, and PrP peptides. The catalase inhibitor 3-amino-1,2,4-triazole (3-AT) and catalase-amyloid interaction inhibitor benzothiazole aniline tetra(ethylene glycol) (BTA-EG4) significantly enhanced neurotoxicity of amyloid peptides in catalase overexpressing neuronal cells. This suggests catalase neuroprotection involves breakdown of hydrogen peroxide (H2O2) plus a direct binding interaction between catalase and the Aβ, ABri, ADan, IAPP, and PrP peptides. Kisspeptin 45–50 had additive neuroprotective actions against the Aβ peptide in catalase overexpressing cells. The effects of 3-AT had an intracellular site of action, while catalase-amyloid interactions had an extracellular component. These results suggest that the 3-AT and BTA-EG4 compounds may be able to inhibit endogenous catalase mediated neuroprotection. Use of BTA-EG4, or compounds that inhibit catalase binding to amyloid peptides, as potential therapeutics for Neurodegenerative diseases may therefore result in unwanted effects. PMID:23968537

  1. Fe-N-C electrocatalysts for oxygen reduction reaction synthesized by using aniline salt and Fe3+/H2O2 catalytic system

    KAUST Repository

    Bukola, Saheed; Merzougui, Belabbes A.; Akinpelu, Akeem; Laoui, Tahar; Hedhili, Mohamed N.; Swain, Greg M.; Shao, Minhua

    2014-01-01

    Non-precious metal (NPM) catalysts are synthesized by polymerizing aniline salt using an aqueous Fe3+/H2O2 coupled catalytic system on a carbon matrix with a porous creating agent. The sulfur containing compunds such as ammonium peroxydisulfate, are eliminated in this method resulting in a much simpler process. The catalysts' porous structures are enhanced with ammonium carbonate as a sacrificial material that yields voids when decomposed during the heat treatment at 900 °C in N2 atmosphere. Two catalysts Fe-N-C/Vu and Fe-N-C/KB (Vu = Vulcan and KB = Ketjen black) were synthesized and characterized. Their oxygen reduction reaction (ORR) activities were investigated using a rotating ring-disk electrode (RRDE) in both 0.1 M KOH and 0.1 M HClO4. The catalysts show improved ORR activities close to that of Pt-based catalysts, low H2O2 formation and also demonstrated a remarkable tolerance towards methanol oxidation.

  2. Fe-N-C electrocatalysts for oxygen reduction reaction synthesized by using aniline salt and Fe3+/H2O2 catalytic system

    KAUST Repository

    Bukola, Saheed

    2014-11-01

    Non-precious metal (NPM) catalysts are synthesized by polymerizing aniline salt using an aqueous Fe3+/H2O2 coupled catalytic system on a carbon matrix with a porous creating agent. The sulfur containing compunds such as ammonium peroxydisulfate, are eliminated in this method resulting in a much simpler process. The catalysts\\' porous structures are enhanced with ammonium carbonate as a sacrificial material that yields voids when decomposed during the heat treatment at 900 °C in N2 atmosphere. Two catalysts Fe-N-C/Vu and Fe-N-C/KB (Vu = Vulcan and KB = Ketjen black) were synthesized and characterized. Their oxygen reduction reaction (ORR) activities were investigated using a rotating ring-disk electrode (RRDE) in both 0.1 M KOH and 0.1 M HClO4. The catalysts show improved ORR activities close to that of Pt-based catalysts, low H2O2 formation and also demonstrated a remarkable tolerance towards methanol oxidation.

  3. The use of gum Arabic as "Green" stabilizer of poly(aniline) nanocomposites: a comprehensive study of spectroscopic, morphological and electrochemical properties.

    Science.gov (United States)

    Quintanilha, Ronaldo C; Orth, Elisa S; Grein-Iankovski, Aline; Riegel-Vidotti, Izabel C; Vidotti, Marcio

    2014-11-15

    Herein we show the synthesis and characterization of water dispersible composites formed by poly(aniline) and the natural polymer gum Arabic (GA), used as stabilizer. The materials were synthesized via a rapid and straightforward method and were fully characterized by different techniques such as UV-Vis, Raman, FTIR, TEM, SEM and cyclic voltammetry. TEM and SEM images revealed that the proportion of stabilizer highly influences the growth mechanism of the nanostructures. It was found spherical particles, elongated structures and large agglomerates at the lower, intermediate and at the higher GA amount, respectively. Accordingly to fluorescence spectra, different hydrophobic structures are formed depending on the GA amount in aqueous solutions, possibly acting as hosting sites for the PANI growth. In order to further study the PANI polymerization in the presence of GA, kinetics experiments were performed and showed that nucleation is the limiting step for the composite growth and a model is proposed. Spectroscopic experiments showed that the presence of GA affects the PANI conformation, avoiding the formation of phenazine structures which highly impairs the electroactivity of PANI. The material integrity is achieved by strong hydrogen bond interactions between PANI and GA as evidenced by the study of specific NH bands in FTIR and Raman analyses. The intensity of the hydrogen bonds decreased upon higher amounts of GA, probably due to steric impediment around the NH sites. Cyclic voltammograms showed a good electroactivity behavior of the modified electrodes presenting distinguishable diffusional processes through the adsorbed composites. By this way, we have thoroughly investigated the formation and properties of new conducting polymer composite materials. Taken into account the low toxicity of GA and the excellent dispersity in water, the materials can successfully be applied in bioelectrochemical applications or as green corrosion inhibitors. Copyright © 2014

  4. Bis(carbazol-9-ylphenyl)aniline end-capped oligoarylenes as solution-processed nondoped emitters for full-emission color tuning organic light-emitting diodes.

    Science.gov (United States)

    Khanasa, Tanika; Prachumrak, Narid; Rattanawan, Rattanawaree; Jungsuttiwong, Siriporn; Keawin, Tinnagon; Sudyoadsuk, Taweesak; Tuntulani, Thawatchai; Promarak, Vinich

    2013-07-05

    A series of bis(3,6-di-tert-butylcarbazol-9-ylphenyl)aniline end-capped oligoarylenes, BCPA-Ars, are synthesized by double palladium-catalyzed cross-coupling reactions. By using this bis(carbazol-9-yl)triphenylamine moiety as an end-cap, we are able to reduce the crystallization and retain the high-emission ability of these planar fluorescent oligoarylene cores in the solid state, as well as improve the amorphous stability and solubility of the materials. The results of optical and electrochemical studies show that their HOMOs, LUMOs, and energy gaps can be easily modified or fine-tuned by either varying the degree of π-conjugation or using electron affinities of the aryl cores which include fluorene, oligothiophenes, 2,1,3-benzothiadiazole, 4,7-diphenyl-4-yl-2,1,3-benzothiadiazole, and 4,7-dithien-2-yl-2,1,3-benzothiadiazole. As a result, their emission spectra measured in solution and thin films can cover the full UV-vis spectrum (426-644 nm). Remarkably, solution-processed nondoped BCPA-Ars-based OLEDs could show moderate to excellent device performance with emission colors spanning the whole visible spectrum (deep blue to red). Particularly, the RGB (red, green, blue) OLEDs exhibit good color purity close to the pure RGB colors. This report offers a practical approach for both decorating the highly efficient but planar fluorophores and tuning their emission colors to be suitable for applications in nondoped and solution-processable full-color emission OLEDs.

  5. pH-dependent equilibrium isotope fractionation associated with the compound specific nitrogen and carbon isotope analysis of substituted anilines by SPME-GC/IRMS.

    Science.gov (United States)

    Skarpeli-Liati, Marita; Turgeon, Aurora; Garr, Ashley N; Arnold, William A; Cramer, Christopher J; Hofstetter, Thomas B

    2011-03-01

    Solid-phase microextraction (SPME) coupled to gas chromatography/isotope ratio mass spectrometry (GC/IRMS) was used to elucidate the effects of N-atom protonation on the analysis of N and C isotope signatures of selected aromatic amines. Precise and accurate isotope ratios were measured using polydimethylsiloxane/divinylbenzene (PDMS/DVB) as the SPME fiber material at solution pH-values that exceeded the pK(a) of the substituted aniline's conjugate acid by two pH-units. Deviations of δ(15)N and δ(13)C-values from reference measurements by elemental analyzer IRMS were small (IRMS. Under these conditions, the detection limits for accurate isotope ratio measurements were between 0.64 and 2.1 mg L(-1) for δ(15)N and between 0.13 and 0.54 mg L(-1) for δ(13)C, respectively. Substantial inverse N isotope fractionation was observed by SPME-GC/IRMS as the fraction of protonated species increased with decreasing pH leading to deviations of -20‰ while the corresponding δ(13)C-values were largely invariant. From isotope ratio analysis at different solution pHs and theoretical calculations by density functional theory, we derived equilibrium isotope effects, EIEs, pertinent to aromatic amine protonation of 0.980 and 1.001 for N and C, respectively, which were very similar for all compounds investigated. Our work shows that N-atom protonation can compromise accurate compound-specific N isotope analysis of aromatic amines.

  6. Synthesis and Characterization of BaFe12O19/Poly(aniline, pyrrole, ethylene terephthalate) Composites Coatings as Radar Absorbing Material (RAM)

    Science.gov (United States)

    Sasria, Nia; Ardhyananta, H.; Fajarin, R.; Widyastuti

    2017-07-01

    This research shows the processing and design of radar absorbing material (RAM) based on barium hexaferrite (BaM) and poly(aniline, pyrrole, ethylene terephthalate) (PAni,PPy,PET). BaM was prepared by sol gel method with Ni-Zn doping at mole fraction of 0. 4 to obtain soft magnetic material. BaM/(PAni,PPy) composites were synthesized by in-situ polymerization method at ˜0 °C. (BaM/PET) composite was prepared by melt compounding at 220°C. The composites were coated on A-grade AH36 steel using Dallenbach Layer, Salisbury Screen and Jaumann Layer methods with thickness of 2, 4, and 6 mm. The composites were evaluated using XRD, SEM, FTIR, VSM, LCM-meter and VNA. Results showed that doped BaM showed BaNixZnxFe12-2xO19 structure. BaM/(PAni,PPy,PET) composites possessed globular morphology with M-O and C-H bonds. BaNixZnxFe12-2xO19 exhibited the value of Ms and Hc, 56.6 emu/g and 60 Oe respectively. High electrical conductivity of 1.77744 × 10-5 S/cm was achieved of BaM/PAni composite. The maximum reflection loss (RL) was reached at - 48.720 dB and 8.1 GHz for BaM/PAni composite coating with 6 mm thickness at Jaumann Layer. These results indicated that BaM/PAni composite was a soft magnetic material with a high RL value that is suitable for RAM, which used in stealth technology on naval vessels.

  7. BF3·Et2O-promoted cleavage of the Csp-Csp2 bond of 2-propynolphenols/anilines: route to C2-alkenylated benzoxazoles and benzimidazoles.

    Science.gov (United States)

    Song, Xian-Rong; Qiu, Yi-Feng; Song, Bo; Hao, Xin-Hua; Han, Ya-Ping; Gao, Pin; Liu, Xue-Yuan; Liang, Yong-Min

    2015-02-20

    A novel BF3·Et2O-promoted tandem reaction of easily prepared 2-propynolphenols/anilines and trimethylsilyl azide is developed to give C2-alkenylated benzoxazoles and benzimidazoles in moderate to good yields. Most reactions could be accomplished in 30 min at room temperature. This tandem process involves a Csp-Csp2 bond cleavage and a C-N bond formation. Moreover, both tertiary and secondary propargylic alcohols with diverse functional groups were tolerated under the mild conditions.

  8. Study of the rearrangement of N-alkylaniline to p-aminoalkylbencene. I. N-ethyl-l-{sup 1}4C-aniline; Estudio de la transposicion de N-alquilanilinas A p-Aminoalquilbenceno mediante {sup 1}4C

    Energy Technology Data Exchange (ETDEWEB)

    Molera, M J; Gamboa, J M; Val Cob, M del

    1961-07-01

    The rearrangement of N-ethylaniline to p-aminoethylbenzene has been studied over the temperature range 200-300 degree centigrade using different catalysts: Cl{sub 2}Co, Cl{sub 2}Zn, Cl{sub 2}Ni, Cl{sub 3}Al, Cl{sub 2}Cd and Br H.N-ethyl-1-{sup 1}4C-aniline has been synthesized from ethyl-1-{sup 1}4C-iodide and aniline and its rearrangement to p-aminoethyl-benzene proves that the ethyl group does not rearrange itself during the reaction. A scheme for the degradation of both the N-ethyl-1-{sup 1}4C aniline and the p-aminoethylbenzene produces is described. (Author) 14 refs.

  9. Investigation of anti-corrosive properties of poly(aniline-co-2-pyridylamine-co-2,3-xylidine) and its nanocomposite poly(aniline-co-2-pyridylamine-co-2,3-xylidine)/ZnO on mild steel in 0.1 M HCl

    Science.gov (United States)

    Alam, Ruman; Mobin, Mohammad; Aslam, Jeenat

    2016-04-01

    A soluble terpolymer of aniline (AN), 2-pyridylamine (PA) and 2,3-xylidine (XY), poly(AN-co-PA-co-XY) and its nanocomposite with ZnO nanoparticles namely, poly(AN-co-PA-co-XY)/ZnO were synthesized by chemical oxidative polymerization employing ammonium persulfate as an oxidant. Nanocomposites of homopolymers, polyaniline/ZnO, poly(XY)/ZnO and poly(PA)/ZnO were also synthesized by following similar synthesis route. FTIR, XRD and SEM techniques were used to characterize the synthesized compounds. The synthesized compounds were chemically deposited on mild steel specimens by solvent evaporation method using N-methyl-2-pyrrolidone (NMP) as solvent and 10% epoxy resin (by weight) as binder. Anticorrosive properties of homopolymer nanocomposites, terpolymer and its nanocomposite coatings were studied in 0.1 M HCl by subjecting them to various corrosion tests which includes: free corrosion potential measurement (OCP), weight loss measurements, potentiodynamic polarization, and AC impedance technique. The surface morphology of the corroded and uncorroded coated steel specimens was evaluated using SEM. The corrosion protection performance of terpolymer nanocomposite coating was compared to the terpolymer and individual homopolymers nanocomposites coatings after 30 days immersion in corrosive medium.

  10. Synthesis of LDPE-g-AA-M [M=Cu(1), Fe(II) and Ni(II)] copolymers via gamma ray-radiation and their use as catalysts and support for poly aniline formation

    International Nuclear Information System (INIS)

    Urena N, F.; Sanchez M, V.; Lopez C, R.

    2009-01-01

    Coordination polymers have many current and potential uses as electrical materials, colorants, medical agents, among others. One of the most vigorously studied areas of application is the use of polymer supports for homogeneous catalysis of organic reactions as hydrogenation, carbonylation and hydroformylation. This kind of catalyst support show clear advantages as their chemical inert character, they can be easily functionalized and prepared with a wide range of properties. A common method to prepare organometallic polymers is the grafting of functionalized polymers onto a main polymer chain in order to fix subsequently electro attractive groups (metals in this case). The functionalized polymer may be grafted using UV, γ-radiation or high energy electrons. In this chapter, the preparation of a series of low density polyethylene (LDPE) grafted with acrylic acid is presented. The grafting reactions were initiated by different doses of γ-radiation. Subsequently, the LDPE-g-AA copolymers were coordinated with different metals such a cooper, iron and nickel. Finally, the organometallic polymers were supported with poly aniline. Samples were characterized by infrared spectroscopy, atomic absorption, scanning electron microscopy, X-ray diffraction, thermogravimetric analysis and differential scanning calorimetry. The electric conductivity of the supported poly aniline was determined by using an indirect method. (Author)

  11. anilines and Ferrocenyl-N

    African Journals Online (AJOL)

    NICOLAAS

    . ISSN 0379-4350 ... (Merck, Germany), aluminium-coated TLC plates, Müeller- ... methanol layered with hexane and this provided orange crystals suitable ..... flat-bottomed glass petri dishes to give a uniform depth of ... then struck on the surface of the agar medium using wire loops.

  12. Rationalization of Benzazole-2-carboxylate versus Benzazine-3-one/Benzazine-2,3-dione Selectivity Switch during Cyclocondensation of 2-Aminothiophenols/Phenols/Anilines with 1,2-Biselectrophiles in Aqueous Medium.

    Science.gov (United States)

    Dhameliya, Tejas M; Chourasiya, Sumit S; Mishra, Eshan; Jadhavar, Pradeep S; Bharatam, Prasad V; Chakraborti, Asit K

    2017-10-06

    The cyclocondensation reaction of 2-aminothiophenols with 1,2-biselectrophiles such as ethyl glyoxalate and diethyl oxalate in aqueous medium leads to the formation of benzothiazole-2-carboxylates via the 5-endo-trig process contrary to Baldwin's rule. On the other hand, the reaction of 2-aminophenols/anilines produced the corresponding benzazine-3-ones or benzazine-2,3-diones via the 6-exo-trig process in compliance with Baldwin's rule. The mechanistic insights of these cyclocondensation reactions using the hard-soft acid-base principle, quantum chemical calculations (density functional theory), and orbital interaction studies rationalize the selectivity switch of benzothiazole-2-carboxylates versus benzazine-3-ones/benzazine-2,3-diones. The presence of water facilitates these cyclocondensation reactions by lowering of the energy barrier.

  13. Complete doping in solid-state by silica-supported perchloric acid as dopant solid acid: Synthesis and characterization of the novel chiral composite of poly [(±)-2-(sec-butyl) aniline

    Energy Technology Data Exchange (ETDEWEB)

    Farrokhzadeh, Abdolkarim; Modarresi-Alam, Ali Reza, E-mail: modaresi@chem.usb.ac.ir

    2016-05-15

    Poly [(±)-2-(sec-butyl) aniline]/silica-supported perchloric acid composites were synthesized by combination of poly[(±)-2-sec-butylaniline] base (PSBA) and the silica-supported perchloric acid (SSPA) as dopant solid acid in solid-state. The X-ray photoelectron spectroscopy (XPS) and CHNS results confirm nigraniline oxidation state and complete doping for composites (about 75%) and non-complete for the PSBA·HCl salt (about 49%). The conductivity of samples was (≈0.07 S/cm) in agreement with the percent of doping obtained of the XPS analysis. Also, contact resistance was determined by circular-TLM measurement. The morphology of samples by the scanning electron microscopy (SEM) and their coating were investigated by XPS, SEM-map and energy-dispersive X-ray spectroscopy (EDX). The key benefits of this work are the preparation of conductive chiral composite with the delocalized polaron structure under green chemistry and solid-state condition, the improvement of the processability by inclusion of the 2-sec-butyl group and the use of dopant solid acid (SSPA) as dopant. - Highlights: • The solid-state synthesis of the novel chiral composites of poly[(±)-2-(sec-butyl)aniline] (PSBA) and silica-supported perchloric acid (SSPA). • It takes 120 h for complete deprotonation of PSBA.HCl salt. • Use of SSPA as dopant solid acid for the first time to attain the complete doping of PSBA. • The coating of silica surface with PSBA.

  14. Antioxidant activities and radical scavenging activities of flavonoids studied by the electrochemical methods and ESR technique based on the novel paramagnetic properties of poly(aniline-co-5-aminosalicylic acid)

    International Nuclear Information System (INIS)

    Yang, Yifei; Mu, Shaolin

    2013-01-01

    Graphical abstract: ESR spectra of the PAASA/RGO/graphite electrodes: (1) in the buffer solution consisting of 0.20 M phosphate and methanol (80: 20, v/v), (2) in the buffer solutions containing 150 μM of (+)-catechin. -- Abstract: Four kinds of flavonoid, viz. flavanone naringenin, Flavone apigenin, flavonol kaempferol, and flavanol (+)-catechin, are used to investigate their antioxidant and radical scavenging activitis in the water-methanol solution of pH 6.3, using the electrochemical methods and electron spin resonance (ESR) technique. Poly(aniline-co-5-aminosalicylic acid) (PAASA) is first used as a radical source that was polymerized on a reduced graphene oxide (RGO)/glassy carbon (GC) disk or on the RGO/graphite fiber electrode. The assessment of the antioxidant activities is performed using both cyclic voltammetry and the open circuit potential measurement. On the basis of results from both electrochemical mathods, the order of the antioxidant actitvities of flavonoids is as follows: (+)-catechin > kaempferol > apigenin > naringenin However, the difference in the antioxidant activities between naringenin and apigenin is very small. On the basis of the ESR signal intensities of PAASA, the order of the radical scavenging activities of flavonoids is in good agreement with that of the above antioxdant activities.Three oxidation peaks on the cyclic voltammograms of (+)-catechin are first detected, which gives us a deep insight into the oxidation mechanism of (+)-catechin

  15. Analysis of a suppressive subtractive hybridization library of Alternaria alternata resistant to 2-propenyl isothiocyanate

    Directory of Open Access Journals (Sweden)

    Heriberto García-Coronado

    2015-07-01

    Conclusions: The fungal response showed that natural compounds could induce tolerance/resistance mechanisms in organisms in the same manner as synthetic chemical products. The response of A. alternata to the toxicity of 2-pITC is a sophisticated phenomenon including the induction of signaling cascades targeting a broad set of cellular processes. Whole-transcriptome approaches are needed to elucidate completely the fungal response to 2-pITC.

  16. (E)-4-Methyl-N-((quinolin-2-yl)ethylidene)aniline as ligand for IIB supramolecular complexes: synthesis, structure, aggregation-induced emission enhancement and application in PMMA-doped hybrid material.

    Science.gov (United States)

    Wang, Ani; Fan, Ruiqing; Dong, Yuwei; Chen, Wei; Song, Yang; Wang, Ping; Hao, Sue; Liu, Zhigang; Yang, Yulin

    2016-12-20

    Judicious structural design employing 2-quinolinecarboxaldehyde and 4-methylaniline was used to generate the Schiff base ligand (E)-4-methyl-N-((quinolin-2-yl)ethylidene)aniline (L). Five IIB complexes, namely, [ZnLCl 2 ] (1), [ZnL(NO 3 ) 2 ] (2), [ZnL(OAc) 2 ] 3 (3), [CdL(OAc) 2 ] 3 (4), and [HgLCl 2 ] (5) have been synthesized based on L. Single-crystal X-ray diffraction analysis indicates that complexes 1, 3 and 4 exhibit 3D networks, whereas 2 and 5 form 2D layers and 1D chains, respectively. TD-DFT calculations show a good correlation with the UV-vis absorption assigned to π → π* intraligand transitions. Furthermore, complexes 1-5 displayed strong greenish luminescent emissions (518-524 nm) in the aggregate state but weak emissions in solution (aggregation-induced emission enhancement), which may be due to the existence of C-HCl/O hydrogen bonding and ππ stacking interactions, resulting in restriction of intramolecular rotation (RIR). Variable-concentration 1 H NMR studies suggested that the aggregates undergo intramolecular changes in conformation due to intermolecular interactions. Moreover, the emission intensity and lifetime exhibited obvious increases induced by mechanical grinding and temperature reduction, which were also attributed to AIEE properties. Subsequently, complex 1 was incorporated into poly(methyl methacrylate) (PMMA), whereby 1-PMMA exhibited enhanced emission intensity (20-fold increase in comparison with that of 1), which offers opportunities for use in plastic greenhouses to increase leaf photosynthesis.

  17. 3-(imidazo[1,2-a:5,4-b']dipyridin-2-yl)aniline inhibits pestivirus replication by targeting a hot spot drug binding pocket in the RNA-dependent RNA polymerase.

    Science.gov (United States)

    Musiu, Simone; Leyssen, Pieter; Froeyen, Mathy; Chezal, Jean-Michel; Neyts, Johan; Paeshuyse, Jan

    2016-05-01

    The compound 3-(imidazo[1,2-a:5,4-b']dipyridin-2-yl)aniline (CF02334) was identified as a selective inhibitor of the cytopathic effect (CPE) caused by bovine viral diarrhea virus (BVDV) in a virus-cell-based assay. The EC50-values for inhibition of CPE, viral RNA synthesis and the production of infectious virus progeny were 13.0 ± 0.6 μM, 2.6 ± 0.9 μM and 17.8 ± 0.6 μM, respectively. CF02334 was found to be inactive in the hepatitis C subgenomic replicon system. CF02334-resistant BVDV was obtained and was found to carry the N264D mutation in the viral RNA-dependent RNA polymerase (RdRp). Molecular modeling revealed that N264D is located in a small cavity near the fingertip domain of the pestivirus polymerase. CF02334-resistant BVDV was proven to be cross-resistant to BPIP, AG110 and LZ37, inhibitors that have previously been described to target the same region of the BVDV RdRp. CF02334 did not inhibit the in vitro activity of recombinant BVDV RdRp, but did inhibit the activity of BVDV replication complexes. Taken together, these observations indicate that CF02334 likely interacts with the fingertip of the pestivirus RdRp at the same position as BPIP, AG110 and LZ37, which marks this region of the viral polymerase as a "hot spot" for inhibition of pestivirus replication. Copyright © 2016 Elsevier B.V. All rights reserved.

  18. Imprinting of molecular recognition sites combined with π-donor-acceptor interactions using bis-aniline-crosslinked Au-CdSe/ZnS nanoparticles array on electrodes: Development of electrochemiluminescence sensor for the ultrasensitive and selective detection of 2-methyl-4-chlorophenoxyacetic acid.

    Science.gov (United States)

    Yang, Yukun; Fang, Guozhen; Wang, Xiaomin; Liu, Guiyang; Wang, Shuo

    2016-03-15

    A novel strategy is reported for the fabrication of bis-aniline-crosslinked Au nanoparticles (NPs)-CdSe/ZnS quantum dots (QDs) array composite by facil one-step co-electropolymerization of thioaniline-functionalized AuNPs and thioaniline-functionalized CdSe/ZnS QDs onto thioaniline-functionalized Au elctrodes (AuE). Stable and enhanced cathodic electrochemiluminescence (ECL) of CdSe/ZnS QDs is observed on the modified electrode in neutral solution, suggesting promising applications in ECL sensing. An advanced ECL sensor is explored for detection of 2-methyl-4-chlorophenoxyacetic acid (MCPA) which quenches the ECL signal through electron-transfer pathway. The sensitive determination of MCPA with limit of detection (LOD) of 2.2 nmolL(-1) (S/N=3) is achieved by π-donor-acceptor interactions between MCPA and the bis-aniline bridging units. Impressively, the imprinting of molecular recognition sites into the bis-aniline-crosslinked AuNPs-CdSe/ZnS QDs array yields a functionalized electrode with an extremely sensitive response to MCPA in a linear range of 10 pmolL(-1)-50 μmolL(-1) with a LOD of 4.3 pmolL(-1 ()S/N=3). The proposed ECL sensor with high sensitivity, good selectivity, reproducibility and stability has been successfully applied for the determination of MCPA in real samples with satisfactory recoveries. In this study, ECL sensor combined the merits of QDs-ECL and molecularly imprinting technology is reported for the first time. The developed ECL sensor holds great promise for the fabrication of QDs-based ECL sensors with improved sensitivity and furthermore opens the door to wide applications of QDs-based ECL in food safety and environmental monitoring. Copyright © 2015 Elsevier B.V. All rights reserved.

  19. The electronic spectra of benzo[b]thiete and transient o-thiobenzoquinonemethide. Spectral assignments on the basis of the electronic spectra of aniline, thiophenol, thioanisole, all-trans-octatetraene and transient o-xylylene in conjunction with quantum-chemical calculations

    Science.gov (United States)

    Schweig, Armin; Diehl, Frank; Kesper, Karl; Meyer, Hermann

    1989-07-01

    The electronic absorption spectra of benzo[b]thiete ( 1) and of transient o-thiobenzoquinonemethide ( 2) have been obtained. Semiempirical valence-electron calculations using the CNDO/S SECI, CNDO/S PERTCI and LNDO/S PERTCI methods and correlation diagrams using suitable reference compounds ad aniline, thiophenol, thioanisole, all-trans-octatetraene and o-xylylene are applied to the interpretation of the spectra. The results clearly reveal 1 as a typically donor-substituted benzene derivative and 2 as a polyene-like system closely related to o-xylylene.

  20. Self-assembly of aniline oligomers

    Czech Academy of Sciences Publication Activity Database

    Zhao, Y.; Tomšík, Elena; Wang, J.; Morávková, Zuzana; Zhigunov, Alexander; Stejskal, Jaroslav; Trchová, Miroslava

    2013-01-01

    Roč. 8, č. 1 (2013), s. 129-137 ISSN 1861-4728 R&D Projects: GA ČR GA202/09/1626; GA ČR GAP205/12/0911 Institutional research plan: CEZ:AV0Z40500505 Institutional support: RVO:61389013 Keywords : morphology * oligoaniline * oligomers Subject RIV: CD - Macromolecular Chemistry Impact factor: 3.935, year: 2013

  1. Protonation site for anilines in aqueous media

    Directory of Open Access Journals (Sweden)

    INNA M. UCHAEVA

    2002-02-01

    Full Text Available By means of the PM3 method it has been shown that the protonation of 2-, 3-, 4-methoxyanilines, 4-methylthioaniline, 2-, 3-, 4-aminobenzoic acids, 2-, 3-, 4-nitroanilines in the gaseous phase proceeds via the amine nitrogen atom. The same result, attributed to the aqueous medium, was obtained for 4-methoxyaniline, 4-aminobenzoic acid and 4-nitroaniline.

  2. poly(aniline-co-o-anisidine)

    Indian Academy of Sciences (India)

    Unknown

    constraints imposed by methoxy group that could induce additional deformation ... factors like geometry as well as electronic structures of both solute and solvent. ... due to the reduction of interchain diffusion of charge, decrease of interchain ...

  3. Luminol-and lucigenin-amplified chemiluminescence with rat liver microsomes. Kinetics and influence of ascorbic acid, glutathione, dimethylsulfoxide, N-t-butyl-a-phenyl-nitrone, copper-ions and a copper complex, catalase, superoxide dismutase, hexobarbital and aniline.

    Science.gov (United States)

    Klinger, W; Karge, E; Kretzschmar, M; Rost, M; Schulze, H P; Dargel, R; Reinemann, C; Rein, H

    1996-07-01

    For the investigation of luminol (LM)-and lucigenin (LC)-amplified chemiluminescence (CL) in rat liver microsomes using both a liquid-scintillation counter (LKB/Wallac 1219 Rackbeta) and a Berthold luminometer (AutoLumat LB 953) optimal incubation mixtures and conditions and basic kinetics have been established. Whereas calibration curves for both LM- and LC-CL are performed with hydrogenperoxide (LC quantum yield is 6.25 fold higher as that of LM), distinct differences were revealed with microsomes, indicating that different reactive oxygen species (ROS) are determined: Both LM- and LC-CL follow the kinetics of enzymatic reactions in terms of dependence on protein and NADPH or NADH concentration, time course, temperature etc., but with differences. LM-CL does not work without addition of Fe2+, whereas LC-CL does. Both copper ions and copper bound in a complex abolish CL, LC-CL being much more sensitive. Isolated cytochrome P-450 (P450) and NADPH P450 reductase from liver of pheno-barbital treated rats alone proved to be inactive in LM-and LC-CL production, whereas te combination 1:1 without and with addition of lipid was highly active in both LM-and LC-CL. Ascorbic acid and glutathione as scavengers diminish both LM- and LC-CL in concentrations higher then 10(5). Dimethyl-sulfoxide (DMSO) was ineffective in LM-CL up to concentrations of 0.2 M, the very high concentration of 2 M diminished LM-CL only to 1/3. LC-CL was diminished starting at concentrations of 100 mM and at 2 M only 10% of maximum LC-CL was observed. The trap substance N-t-butyl-a-phenylnitrone (BNP) also diminished LC-CL more effectively than LM-CL. Clearcut differences were revealed by the addition of catalase and superoxide dismutase: both enzymes diminished LM-CL only, without any influence on LC-CL. Hexobarbital, a potent uncoupler of P450, enhances LM-CL fivefold, whereas LC-CL is barely influenced. Aniline (without uncoupling capability) decreased both LM-and LC-CL increasingly with increasing

  4. Metabolism of sinigrin (2-propenyl glucosinolate) by the human colonic microflora in a dynamic in vitro large-intestinal model.

    Science.gov (United States)

    Krul, Cyrille; Humblot, Christèle; Philippe, Catherine; Vermeulen, Martijn; van Nuenen, Marleen; Havenaar, Robert; Rabot, Sylvie

    2002-06-01

    Cruciferous vegetables, such as Brassica, which contain substantial quantities of glucosinolates, have been suggested to possess anticarcinogenic activity. Cutting and chewing of cruciferous vegetables releases the thioglucosidase enzyme myrosinase, which degrades glucosinolates to isothiocyanates and other minor metabolites. Cooking of cruciferous vegetables inactivates the myrosinase enzyme, allowing intact glucosinolates to reach the large intestine, where they can be degraded by the indigenous microflora into isothiocyanates. This local release of isothiocyanates may explain the protective effect of cruciferous vegetables on the colon epithelium. However, little is known about the amounts and identities of glucosinolate metabolites produced by the human microflora. The production of allyl isothiocyanate from sinigrin was investigated in a dynamic in vitro large-intestinal model, after inoculation with a complex microflora of human origin. Sinigrin and allyl isothiocyanate concentrations were analysed in the lumen and dialysis fluid of the model. Peak levels of allyl isothiocyanate were observed between 9 and 12 h after the addition of sinigrin. The model was first set up with a pooled and cultured human microflora, in which 1 and 4% of, respectively, 1 and 15 mM sinigrin, was converted into AITC. However, the conversion rate was remarkably higher if different individual human microflora were used. Between 10% and 30% (mean 19%) of the sinigrin was converted into allyl isothiocyanate. The results of this study suggest that allyl isothiocyanate is converted further into other, yet unknown, metabolites.

  5. Metabolism of sinigrin (2-propenyl glucosinolate) by the human colonic microflora in a dynamic in vitro large-intestinal model

    NARCIS (Netherlands)

    Krul, C.A.M.; Humblot, C.; Philippe, C.; Vermeulen, M.; Nuenen, M. van; Havenaar, R.; Rabot, S.

    2002-01-01

    Cruciferous vegetables, such as Brassica, which contain substantial quantities of glucosinolates, have been suggested to possess anticarcinogenic activity. Cutting and chewing of cruciferous vegetables releases the thioglucosidase enzyme myrosinase, which degrades glucosinolates to isothiocyanates

  6. Electrorheology of aniline-oligomer suspensions under oscillatory shear

    Czech Academy of Sciences Publication Activity Database

    Mrlík, M.; Pavlínek, V.; Almajdalawi, S.; Saha, P.; Bober, Patrycja; Stejskal, Jaroslav

    2013-01-01

    Roč. 412, č. 1 (2013), 012007_1-012007_6 ISSN 1742-6588. [International Conference on Electrorheological Fluids and Magnetorheological Suspensions /13./ - ERMR2012. Ankara, 02.07.2012-06.07.2012] R&D Projects: GA ČR GA202/09/1626 Institutional support: RVO:61389013 Keywords : electrorheology * polyaniline * conducting polymer Subject RIV: BK - Fluid Dynamics

  7. Highly Efficient Formylation of Alcohols, Thiols and Aniline ...

    African Journals Online (AJOL)

    NJD

    2008-11-05

    formyl compounds in quantitative yields. In a similar manner, various substituted aromatic and aliphatic hydroxyl groups were smoothly formylated under mild reaction conditions and gave the desired O-formylated alcohols in high.

  8. 4-Nitro-N-[(E-thiophen-2-ylmethylidene]aniline

    Directory of Open Access Journals (Sweden)

    Abdullah M. Asiri

    2012-07-01

    Full Text Available In the title compound, C11H8N2O2S, there is a twist in the molecule, with the dihedral angle between the five- and six-membered rings being 31.77 (9°. The nitro group is slightly twisted out of the plane of the benzene ring to which it is attached [O—N—C—C torsion angle = 9.0 (3°]. The S and N atoms are syn. In the crystal, supramolecular layers parallel to (-204 are formed by C—H...O and C—H...N interactions. These layers are connected into a three-dimensional architecture by π–π interactions occurring between centrosymmetrically related benzene rings [centroid–centroid distance = 3.6020 (11 Å].

  9. Synthesis and characterization of poly aniline for electrochemical biosensor construction

    International Nuclear Information System (INIS)

    Magalhaes, Gleice S.L.; Southgate, Erica F.; Alhadeff, Eliana M.; Guimaraes, Maria Jose O.C.

    2011-01-01

    Conductors polymers have many attractive interests to the industry due their highly technological applications. This work treats specially of polyaniline because it's large electrical conductivity, electrochemical properties, associate to the chemical stability in environmental conditions and synthesis facility. The main of this work is the application in a construction of an electrochemical biosensor for ethanol detection and quantification. Different conditions of synthesis of the conductor emeraldine polyaniline form were studied, investigated the influence of the dopant agent and the reactional environment conditions temperature on the reaction yield and conductivities. The polyaniline that showed the best conductivity were characterized by differential and thermal gravimetric analysis, infrared spectroscopy, X ray diffraction, and cycle voltammetry, comparing with the commercial polyaniline. (author)

  10. Reprotonation of aniline: A route to various conducting polymer materials

    Czech Academy of Sciences Publication Activity Database

    Stejskal, Jaroslav; Prokeš, B.; Trchová, Miroslava

    2008-01-01

    Roč. 68, č. 9 (2008), s. 1355-1361 ISSN 1381-5148 R&D Projects: GA ČR GA202/06/0419; GA ČR GA203/08/0686 Institutional research plan: CEZ:AV0Z40500505 Keywords : acids * conductivity * conducting polymer Subject RIV: CD - Macromolecular Chemistry Impact factor: 2.039, year: 2008

  11. Design and control of integrated styrene aniline production plant

    NARCIS (Netherlands)

    Partenie, O.; Van der Last, V.; Sorin Bildea, C.; Altimari, P.

    2009-01-01

    This paper illustrates the operational difficulties arising from simultaneously performing exothermic and endothermic reactions, and demonstrates that a plant can be built and safely operated by integrating the design and plantwide control issues. The behaviour of reactor – separation – recycle

  12. Physicochemical and morphological properties of poly(aniline-co-pyrrole)

    CSIR Research Space (South Africa)

    Mavundla, SE

    2010-01-01

    Full Text Available ) showed disordered structures of spherical agglomerates. The copolymers showed improved UV–Vis absorption with the broad peak from 450 to 850 nm. The copolymers exhibited a lower conductivity compared to the homopolymers due to the unsuccessful complex...

  13. The polymerization of aniline in polystyrene latex particles

    Czech Academy of Sciences Publication Activity Database

    Blinova, Natalia V.; Reynaud, S.; Roby, F.; Trchová, Miroslava; Stejskal, Jaroslav

    2010-01-01

    Roč. 160, 15/16 (2010), s. 1598-1602 ISSN 0379-6779 R&D Projects: GA AV ČR IAA400500905; GA ČR GA203/08/0686; GA ČR GA202/09/1626 Institutional research plan: CEZ:AV0Z40500505 Keywords : polyaniline * polystyrene latex * polyaniline-polystyrene composite Subject RIV: CD - Macromolecular Chemistry Impact factor: 1.871, year: 2010

  14. and poly(aniline-Co-2,5-dimethoxyaniline)

    Indian Academy of Sciences (India)

    Unknown

    ctronic, electrochemical and optical properties and envi- ronmental and thermal stability (Stotheim 1987;. Macdiarmid et al 1989; Genies et al 1990; Olinga et al. 2000; Ruckenstein and Yin 2000). Polyaniline, however, is severely limited in view of its insolubility in common organic solvents making its characterization rather ...

  15. Oxidation of aniline with strong and weak oxidants

    Czech Academy of Sciences Publication Activity Database

    Sapurina, I. Yu.; Stejskal, Jaroslav

    2012-01-01

    Roč. 82, č. 2 (2012), s. 256-275 ISSN 1070-3632 R&D Projects: GA AV ČR IAA400500905 Institutional research plan: CEZ:AV0Z40500505 Keywords : polyaniline * conducting polymer * oxidant Subject RIV: CD - Macromolecular Chemistry Impact factor: 0.432, year: 2012

  16. Isolation and characterization of a bacterial strain for aniline ...

    African Journals Online (AJOL)

    STORAGESEVER

    which the microbes enzymatically decompose and utilize in cellular ... dioxygenases, liberating ammonia and subsequently ... others). MATERIALS AND METHODS ... results were then interpreted for bacterial identification according to.

  17. Excited state kinetics of anthracene-bridge-aniline intramolecular exciplexes

    DEFF Research Database (Denmark)

    Thyrhaug, Erling; Hammershøj, Peter; Kjær, Kasper Skov

    2014-01-01

    excited anthracene state (LE) and an excited state complex (exciplex, EP) in non-polar solvents. The kinetics of the excited state processes were established in decalin from the time-resolved emission, and was shown to be strongly influenced by an electron-transfer state (ET). For quantitative studies...

  18. Preconcentration, determination and speciation of iron by solid-phase extraction using dimethyl (E)-2-[(Z)-1-acetyl)-2-hydroxy-1-propenyl]-2-butenedioate

    Energy Technology Data Exchange (ETDEWEB)

    Khayatian, Gholamreza; Hassanpoor, Shahed; Nasiri, Farough; Zolali, Amin [Chemistry Department, Faculty of Science, University of Kurdistan, Sanandaj (Iran, Islamic Republic of)

    2012-07-01

    A new sensitive and selective procedure for speciation of trace dissolved Fe(III) and Fe(II), using modified octadecyl silica membrane disks and determination by flame atomic absorption spectrometry was developed. A ML{sub 3} complex is formed between the ligand and Fe(III) responsible for extraction of metal ion on the disk. Various factors influencing the separation of iron were investigated and the optimized operation conditions were established. Under optimum conditions, an enrichment factor of 166 was obtained for Fe{sup 3+}ions. The calibration graph using the preconcentration system for Fe{sup 3+} was linear between 40.0 and 1000.0 {sup m}u{sup g} L{sup -1}. (author)

  19. Identification of N-[3-(3,4-Dihydroxyphenyl)-1-oxo-2-propenyl]-2-hydroxybenzamide (CGK-101) as a Small Molecule Inhibitor of the Wnt/β-catenin Pathway

    Energy Technology Data Exchange (ETDEWEB)

    Park, Seoyoung; Oh, Sangtaek [Kookmin Univ., Seoul (Korea, Republic of); Lee, Jeehyun; Lee, Jung Sook; Song, Gyuyong [Chungnam National Univ., Daejeon (Korea, Republic of)

    2013-04-15

    We identified CGK-101 as an antiproliferative agent that acts against HCT116 colon cancer cells. CGK-101 induced the degradation of intracellular β-catenin, thereby suppressing the Wnt/β-catenin pathway. Therefore, CGK-101 can be developed as a preventive or therapeutic agent against various cancers that involve abnormal β-catenin accumulation. Colorectal cancer is the most prevalent type of cancer and the second leading cause of cancer-related mortalities in Western countries. Current therapies for colorectal cancer rely on surgical resection, which is rarely curative in advanced disease, and traditional cytotoxic agents exhibit limited effects. Therefore, it is crucial to develop new therapeutic strategies that are based on defined molecular lesions.

  20. Distribution and metabolism of cis- and trans-resmethrin (5-benzyl-3-furyl-methyl-2,2-dimethyl 3-(2-methyl-propenyl)cyclopropanecarboxylate) in laying hens

    International Nuclear Information System (INIS)

    Christopher, R.J.

    1986-01-01

    The cis and trans isomers of the synthetic pyrethroid, resmethrin (5-benzyl-3-furylmethyl-(IRS)-chrysanthemate), labeled with radiocarbon in either the alcohol or acid moiety, were individually administered orally to White Leghorn laying hens at a dosage of 10 mg/kg. With each isomer and label position, greater than 90% of the radiocarbon was eliminated in the excreta within 24 hours posttreatment. Radiocarbon residues in the egg white and yolk fractions were low, with peak levels observed at 1-2 and 4-5 days post-treatment in white and yolk, respectively. Residues were considerably lower in egg whites than in yolks. In birds killed 12 hours post-treatment, radiocarbon residues in tissues were low with peak levels in liver and kidney. Unmetabolized cis- or trans-resmethrin was detected in all tissues analyzed from birds killed at 12 hours post-treatment and represented the major metabolite in fat. The majority of the tissues from hens 14 days post-treatment contained no detectable levels of radiocarbon and would appear not to be indicative of appreciable residue retention. Numerous metabolites were isolated and were present in both the free and conjugated form. The metabolic routes for both resmethrin isomers arise from ester hydrolysis and oxidation of the hydrolytic products. Certain of these metabolites are further conjugated with glucuronic acid, sulfate or other unidentified compounds before excretion

  1. Synthesis, resolution and radioiodination of S(-)trans-5-hydroxy-2-[N-n-propyl-N-(3'-iodo-2'-propenyl)amino]tet ralin-S(-)trans-5-OH-PIPAT: a new dopamine D2-like receptor ligand

    International Nuclear Information System (INIS)

    Chumpradit, Sumalee; Meiping Kung; Vessotskie, Janet; Kung, H.F.

    1995-01-01

    A new dopamine D2-like receptor ligand, (R,S)trans-5-hydroxy-2-[N-n0propyl-N-(3'-iodo-2'-propeny)amino]tet ralin ((R,S)trans-5-OH-PIPAT,3), based on high affinity dopamine receptor agonist 5-hydroxy-2-[N,N-(di-n-propyl)-2-amino]tetralin (5-OH-DPAT,1), was prepared. The synthesis was achieved by a reductive amination of 5-methoxy-2-tetralone with n-propylamine, followed by N-alkylation, to afford 5-methoxy-N-propyl-N-2'-aminotetralin,7. Reduction of 7 with tributyltin hydride gave the tri-n-butyl tin derivative,8, which was converted to 9 by an iododemetalation reaction. Demethylation of 9 gave the desired compound, (R,S)trans-5-OH-PIPAT,3. The resolved (R) and (S)trans-5-OH-PIPAT,3 were also quantitatively prepared. (author)

  2. Phototransformation pathways of the fungicide dimethomorph ((E,Z) 4-[3-(4-chlorophenyl)-3-(3,4-dimethoxyphenyl)-1-oxo-2-propenyl]morpholine), relevant to sunlit surface waters.

    Science.gov (United States)

    Avetta, Paola; Marchetti, Giulia; Minella, Marco; Pazzi, Marco; De Laurentiis, Elisa; Maurino, Valter; Minero, Claudio; Vione, Davide

    2014-12-01

    Dimethomorph (DMM) is a widely used fungicide that shows low toxicity for birds and mammals but can be quite toxic to aquatic organisms. The persistence of DMM in surface waters is thus of high importance, and this work modelled its water half-life time due to photochemical processes. Depending on environmental conditions (e.g. water chemistry, depth, season), DMM lifetime could vary from a few days to a few months. For lifetimes of a few weeks or shorter, photochemistry would be an important pathway for DMM attenuation in surface waters. Such conditions could be reached in summer, in shallow water bodies with low dissolved organic carbon (DOC) and high nitrate and/or nitrite. The main pathways accounting for DMM photodegradation in environmental waters would be the reactions with OH and with the triplet states of chromophoric dissolved organic matter, (3)CDOM* (under the hypothesis that (3)CDOM* reactivity is well described by the triplet state of anthraquinone-2-sulphonate), while direct photolysis would be less important. The OH pathway would be favoured in low-DOC waters, while the opposite conditions would favour (3)CDOM*. It was possible to detect and identify some intermediates formed upon reaction between DMM and (3)CDOM*, namely N-formylmorpholine, 4-chloroacetophenone and 4-chlorobenzoic acid. The transformation of DMM into the detected compounds would not increase the acute toxicity of the fungicide towards mammals, and the acute effects for freshwater organisms could be decreased significantly. Copyright © 2014 Elsevier B.V. All rights reserved.

  3. Electrochemistry of Anilines. II. Oxidation to Dications, Electrochemical and uv/vis Spectroelectrochemical Investigation.

    Science.gov (United States)

    1984-01-06

    the products of bulk electrolyses . We did not investigate the oxidation of Id in this second wave because of the reason mentioned above. THE OVERALL...Nitrenium ion 6b reacts in a chemical reaction. Bulk electrolysis of lb in the presence cf water and 2,6-lutidine shows that ,iinozuinoie ib is ..red. sc...proton exchange equilibrium: NH NH C.CC 00 OeH-,-. 0C 7 OC-: - 4 - C C., . ,O, elettroinalytical experiments, traces of water are presumably reacting

  4. N,N-Diethyl-4-[(E-(pyridin-3-yldiazenyl]aniline

    Directory of Open Access Journals (Sweden)

    Tatiana V. Timofeeva

    2013-08-01

    Full Text Available The molecule of the title compound, C15H18N4, adopts a trans conformation with respect to the diazo N=N bond. The dihedral angle between the benzene and pyridine rings in the molecule is 8.03 (5°. In the crystal, a weak C—H...π interaction arranges the molecules into a corrugated ribbon, with an antiparallel orientation of neighboring molecules propagating in the [100] direction.

  5. Spectroscopy of thin polyaniline films deposited during chemical oxidation of aniline

    Czech Academy of Sciences Publication Activity Database

    Trchová, Miroslava; Morávková, Zuzana; Šeděnková, Ivana; Stejskal, Jaroslav

    2012-01-01

    Roč. 66, č. 5 (2012), s. 415-445 ISSN 0366-6352 R&D Projects: GA AV ČR IAA100500902; GA AV ČR IAA400500905 Institutional research plan: CEZ:AV0Z40500505 Keywords : polyaniline * thin films * spectroscopy Subject RIV: CD - Macromolecular Chemistry Impact factor: 0.879, year: 2012

  6. Proton transfer and isotope-induced reaction in aniline cluster ions

    Czech Academy of Sciences Publication Activity Database

    Lengyel, Jozef; Poterya, Viktoriya; Fárník, Michal

    2015-01-01

    Roč. 50, č. 3 (2015), s. 643-649 ISSN 1076-5174 R&D Projects: GA ČR GA14-14082S Institutional support: RVO:61388955 Keywords : isotope effect * intracluster reaction * Electron ionization Subject RIV: CF - Physical ; Theoretical Chemistry Impact factor: 2.541, year: 2015

  7. Oxidation of aniline in dopant-free template-free dilute reaction media

    Czech Academy of Sciences Publication Activity Database

    Rakić, A.; Bajuk-Bogdanovic, D.; Mojovic, M.; Ciric-Marjanovic, G.; Milojević-Rakić, M.; Mentus, S.; Marjanovic, B.; Trchová, Miroslava; Stejskal, Jaroslav

    2011-01-01

    Roč. 127, č. 3 (2011), s. 501-510 ISSN 0254-0584 R&D Projects: GA ČR GA203/08/0686 Institutional research plan: CEZ:AV0Z40500505 Keywords : polyaniline * nanostructures * chemical synthesis Subject RIV: CD - Macromolecular Chemistry Impact factor: 2.234, year: 2011

  8. Solvent effects on dopant-free pH-falling polymerization of aniline

    Czech Academy of Sciences Publication Activity Database

    Rakić, A. A.; Vukomanović, M.; Trifunovic, S.; Travas-Sejdic, J.; Chaudhary, O. J.; Horský, Jiří; Ciric-Marjanovic, G.

    2015-01-01

    Roč. 209, November (2015), s. 279-296 ISSN 0379-6779 Institutional support: RVO:61389013 Keywords : dopant-free template -free method * nanostructures * polyaniline Subject RIV: CD - Macromolecular Chemistry Impact factor: 2.299, year: 2015

  9. 4-Chloro-N-(3,4,5-trimethoxybenzylidene)aniline

    Czech Academy of Sciences Publication Activity Database

    Khalaji, A.D.; Asghari, J.; Fejfarová, Karla; Dušek, Michal

    2009-01-01

    Roč. 65, - (2009), o253-o253 ISSN 1600-5368 R&D Projects: GA ČR GC202/07/J008 Institutional research plan: CEZ:AV0Z10100521 Keywords : X-ray diffraction * Jana 2006 Subject RIV: BM - Solid Matter Physics ; Magnetism Impact factor: 0.411, year: 2009

  10. Ablation and formation by plasma of silver metallic films on poly aniline

    International Nuclear Information System (INIS)

    Palacios, J.C.; Olayo, G.; Morales, J.; Cruz, G.J.

    1999-01-01

    This work shows a study about the ablation by plasma conditions in which is possible to form silver layers over polymeric surfaces with the purpose to increase the electric conductivity of the surface. The adhesion between layers formed by polymerization and ablation by plasma respectively is high, with this it is possible to find adequate conditions for getting the polymerization and ablation simultaneously forming with this a thin polymer matrix which would have metallic elements dispersed in its structure. (Author)

  11. Prenatal exposure to paracetamol/acetaminophen and precursor aniline impairs masculinisation of male brain and behaviour

    DEFF Research Database (Denmark)

    Hay-Schmidt, Anders; Finkielman, Olivia T. Ejlstrup; Jensen, Benjamin Anderschou Holbech

    2017-01-01

    to be inhibited by APAP. Through intrauterine exposure experiments in C57BL/6 mice, we found that exposure to APAP decreased neuronal number in the sexually dimorphic nucleus (SDN) of the preoptic area (POA) in the anterior hypothalamus of male adult offspring. Likewise, exposure to the environmental pollutant...

  12. EFFECT OF VARIOUS FACTORS ON DEHALOGENATION OF CHLORINATED PHENOLS AND ANILINES DURING OXIDATIVE COUPLING. (R823847)

    Science.gov (United States)

    The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Concl...

  13. Poly (aniline-co-m-aminobenzoic acid) deposited on poly (vinyl ...

    Indian Academy of Sciences (India)

    The composite film was characterized by Fourier transform infra red (FT–IR) and ultraviolet visible (UV–VIS) spectroscopy and electrical measurements. Surface morphology of the composite films was studied by field emission scanning electron microscopy (FESEM). The variation of conductivity of the films was studied.

  14. (E-4-Chloro-N-[(E-2-methyl-3-phenylallylidene]aniline

    Directory of Open Access Journals (Sweden)

    Jim Simpson

    2009-02-01

    Full Text Available The title Schiff base compound, C16H14ClN, adopts E configurations with respect to both the C=C and C=N bonds. The dihedral angle between the two aromatic rings is 53.27 (4°, while the plane through the C=C—C=N system is inclined at 9.06 (8° to the benzene ring and 44.92 (5° to the chlorobenzene ring. In the crystal structure, weak C—H...Cl and C—H...N hydrogen bonds stack the molecules down the a axis.

  15. Polyaniline nanostructures and the role of aniline oligomers in their formation

    Czech Academy of Sciences Publication Activity Database

    Stejskal, Jaroslav; Sapurina, I.; Trchová, Miroslava

    2010-01-01

    Roč. 35, č. 12 (2010), s. 1420-1481 ISSN 0079-6700 R&D Projects: GA MŠk ME 847; GA AV ČR IAA400500905; GA AV ČR IAA100500902; GA ČR GA203/08/0686; GA ČR GA202/09/1626 Institutional research plan: CEZ:AV0Z40500505 Keywords : conducting polymer * nanofibers * nanotubes Subject RIV: CD - Macromolecular Chemistry Impact factor: 22.870, year: 2010

  16. Assembly of tobacco mosaic virus into fibrous and macroscopic bundled arrays mediated by surface aniline polymerization.

    Science.gov (United States)

    Niu, Zhongwei; Bruckman, Michael A; Li, Siqi; Lee, L Andrew; Lee, Byeongdu; Pingali, Sai Venkatesh; Thiyagarajan, P; Wang, Qian

    2007-06-05

    One-dimensional (1D) polyaniline/tobacco mosaic virus (TMV) composite nanofibers and macroscopic bundles of such fibers were generated via a self-assembly process of TMV assisted by in-situ polymerization of polyaniline on the surface of TMV. At near-neutral reaction pH, branched polyaniline formed on the surface of TMV preventing lateral association. Therefore, long 1D nanofibers were observed with high aspect ratios and excellent processibility. At a lower pH, transmission electron microscopy (TEM) analysis revealed that initially long nanofibers were formed which resulted in bundled structures upon long-time reaction, presumably mediated by the hydrophobic interaction because of the polyaniline on the surface of TMV. In-situ time-resolved small-angle X-ray scattering study of TMV at different reaction conditions supported this mechanism. This novel strategy to assemble TMV into 1D and 3D supramolecular composites could be utilized in the fabrication of advanced materials for potential applications including electronics, optics, sensing, and biomedical engineering.

  17. Crystal structure of (E)-3-fluoro-N-((5-nitrothiophen-2-yl)methylene)aniline

    Energy Technology Data Exchange (ETDEWEB)

    Karataş, Şadiye; Tanak, Hasan, E-mail: hasantanak@gmail.com [Amasya University, Department of Physics, Faculty of Arts and Sciences (Turkey); Ağar, Ayşen Alaman [Ondokuz Mayıs University, Department of Chemistry, Faculty of Arts and Sciences (Turkey)

    2016-05-15

    The structure of the title compound C{sub 11}H{sub 7}FN{sub 2}O{sub 2}S was characterized by single crystal X-ray diffraction. The compound crystallizes in the monoclinic space group P2{sub 1}/n with Z = 12, i.e. with three molecules in asymmetric unit. The molecules are not planar: the dihedral angles between the planes of thiophene and the benzene rings are 42.3(3)°, 42.0(3)°, and 48.9(2)°. In the crystal, intermolecular C–H···F interactions link the molecules through R{sub 2}{sup 2} (14) ring motif. The crystal packing is also stabilized by π···π interactions.

  18. Photooxidation of Aniline Derivatives Can Be Activated by Freezing Their Aqueous Solutions

    Czech Academy of Sciences Publication Activity Database

    Corrochano, P.; Nachtigallová, Dana; Klán, P.

    2017-01-01

    Roč. 51, č. 23 (2017), s. 13763-13770 ISSN 0013-936X R&D Projects: GA ČR(CZ) GA15-12386S Institutional support: RVO:61388963 Keywords : air-ice interface * experimental-computational approach * dissolved organic matter Subject RIV: CF - Physical ; Theoretical Chemistry OBOR OECD: Physical chemistry Impact factor: 6.198, year: 2016

  19. Laboratory shake flask batch tests can predict field biodegradation of aniline in the Rhine

    DEFF Research Database (Denmark)

    Toräng, Lars; Reuschenbach, P.; Müller, B.

    2001-01-01

    .7 degreesC, respectively. This field rate estimate was compared with results from 38 laboratory shake flask batch tests with Rhine water which averaged 1.5 day(-1) at 15 degreesC and 2.0 day(-1) at 20 degreesC. These results indicate that laboratory shake flask batch tests with low concentrations of test...

  20. Polymerization of aniline in an organic peroxide system by the inverted emulsion process

    OpenAIRE

    Rao, Palle Swapna; Sathyanarayana, DN; Palaniappan, S

    2002-01-01

    An inverted emulsion process for the synthesis of the emeraldine salt of polyaniline using a novel oxidizing agent, namely benzoyl peroxide, is described. The polymerization is carried out in a nonpolar solvent in the presence of a functionalized protonic acid (sulfosalicylic acid) as the dopant and an emulsifier (sodium lauryl sulfate). The influence of synthesis conditions such as the duration of the reaction, temperature, concentration of the reactants, etc., on the properties of polyanili...

  1. Intrauterine Exposure to Paracetamol and Aniline Impairs Female Reproductive Development by Reducing Follicle Reserves and Fertility

    DEFF Research Database (Denmark)

    Holm, Jacob Bak; Mazaud-Guittot, Severine; Danneskiold-Samsøe, Niels Banhos

    2016-01-01

    in shortening of the anogenital distance in adult offspring, suggesting that fetal hormone signaling had been disturbed. Female offspring of paracetamol-exposed mothers had ovaries with diminished follicle reserve and reduced fertility. Fetal gonads of exposed animals had also reduced gonocyte numbers......, suggesting that the reduced follicle count in adults could be due to early disruption of germ cell development. However, ex vivo cultures of ovaries from 12.5 days post coitum fetuses showed no decrease in proliferation or expression following exposure to paracetamol. This suggests that the effect...... of paracetamol occurs prior to this developmental stage. Accordingly, using embryonic stem cells as a proxy for primordial germ cells we show that paracetamol is an inhibitor of cellular proliferation, but without cytotoxic effects. Collectively, our data show that intrauterine exposure to paracetamol at levels...

  2. Semi-organic salts of aniline with inorganic acids: prospective materials for the second harmonic generation

    Czech Academy of Sciences Publication Activity Database

    Matulková, Irena; Cihelka, Jaroslav; Fejfarová, Karla; Dušek, Michal; Pojarová, Michaela; Vaněk, Přemysl; Kroupa, Jan; Šála, Michal; Krupková, Radmila; Němec, I.

    2011-01-01

    Roč. 13, č. 12 (2011), s. 4131-4138 ISSN 1466-8033 R&D Projects: GA MŠk OC09044; GA ČR GA203/09/0878 Institutional research plan: CEZ:AV0Z40400503; CEZ:AV0Z10100521; CEZ:AV0Z40550506 Keywords : nonlinear optical properties * vibrational spectra * phase transition Subject RIV: CF - Physical ; Theoretical Chemistry Impact factor: 3.842, year: 2011

  3. 3-substituted anilines as scaffolds for the construction of glutamine synthetase and DXP-reductoisomerase inhibitors

    CSIR Research Space (South Africa)

    Mutorwa, M

    2009-01-01

    Full Text Available Access to a series of truncated ATP analogs, as potential anti-tuberculosis agents, has been explored via alkylation and acylation of 3-aminophenol, whereas chloroacetylation, using chloroacetyl chloride, and subsequent Arbuzov phosphonation of a...

  4. In-situ polymerized polyaniline films 6. FTIR spectroscopic study of aniline polymerization

    Czech Academy of Sciences Publication Activity Database

    Trchová, Miroslava; Šeděnková, Ivana; Stejskal, Jaroslav

    2005-01-01

    Roč. 154, 1-3 (2005), s. 1-4 ISSN 0379-6779. [International Conference on Science and Technology of Synthetic Metals. Wollongong, 28.06.2004-02.07.2004] R&D Projects: GA AV ČR(CZ) IAA4050313; GA ČR(CZ) GA202/02/0698 Keywords : polyaniline * thin films * infrared spectroscopy Subject RIV: BM - Solid Matter Physics ; Magnetism Impact factor: 1.320, year: 2005

  5. (E-N,N-Diethyl-2,6-diisopropyl-4-[2-(4-nitrophenylethenyl]aniline

    Directory of Open Access Journals (Sweden)

    Heiner Detert

    2013-12-01

    Full Text Available The title compound, C24H32N2O2, was prepared by Horner olefination of 4-diethylamino-3,5-diisopropylbenzaldehyde and diethyl p-nitrobenzylphosphonate. There are two independent molecules (A and B in the asymmetric unit. Their main axes, defined by the line connecting the N atoms of the nitro and amino groups, open an angle of 79.42 (3°. Steric hindrance around the amino group is reflected in a long aryl C—N bond [1.434 (3 Å for molecule A and 1.440 (3 Å for molecule B], a pyramidal geometry [angle sum = 350.0 (2° for molecule A and 349.6 (2° for molecule B], and dihedral angles between the phenylene group and the plane defined by the CH2—N—CH2 unit of 86.9 (3° for molecule A and 88.3 (3° for molecule B. This gives structural support for the electronic decoupling of the amino group from the nearly planar nitrostilbene moiety (r.m.s. deviation for C, N and O atoms = 0.097 for molecule A and 0.107 Å for molecule B.

  6. Bacterial mutagenicity and mammalian cell DNA damage by several substituted anilines.

    Science.gov (United States)

    Zimmer, D; Mazurek, J; Petzold, G; Bhuyan, B K

    1980-04-01

    Several substituted alkyl- and haloanilines were tested for their ability to mutate Salmonella typhimurium and to damage the DNA of mammalian (V79) cells. These results were correlated with their reported carcinogenicity. Of 9 suspected carcinogens, 4 were bacterial mutagens and 4 (out of 7 tested) damaged DNA of V79 cells. The following compounds were weakly mutagenic (less than 150 revertants/mumole): 4-fluoroaniline, 2,3-, 2,4-, 2,5- and 3,4-dimethylaniline, and 2-methyl-4-fluoroaniline. The following compounds were strong mutagens: 2,4,5-trimethylaniline, 2-methyl-4-chloro-, and 2-methyl-4-bromo-, 4-methyl-2-chloro-, 4-methyl-2-bromo- and 2-ethyl-4-chloroaniline. The compounds which damaged DNA in V79 cells were: 2 methyl-4-chloroaniline, 2-methyl-4-bromoaniline, 2,4,5- and 2,4,6-trimethylaniline.

  7. (E)-4-Bromo-N-(2,3-dimethoxybenzylidene)aniline

    Czech Academy of Sciences Publication Activity Database

    Fejfarová, Karla; Makrlík, E.; Khalaji, A.D.

    2010-01-01

    Roč. 66, Part 9 (2010), o2217/1-o2217/9 ISSN 1600-5368 Grant - others:AV ČR(CZ) AP0701 Program:Akademická prémie - Praemium Academiae Institutional research plan: CEZ:AV0Z10100521 Keywords : crystal structure * Jana2006 * x-ray diffraction * Schiff bases Subject RIV: BM - Solid Matter Physics ; Magnetism Impact factor: 0.413, year: 2010

  8. X-ray analysis of 2-aniline benzo(2,3-)

    Indian Academy of Sciences (India)

    dione has been determined by X-ray crystallographic techniques. This compound crystallizes in the orthorhombic space group 212121 with unit cell parameters: = 5.467(1), = 10.657(3), = 19.602(6) Å; = 1142.01(5) Å3, = 4.

  9. 4-Fluoro-N-[(E-3,4,5-trimethoxybenzylidene]aniline

    Directory of Open Access Journals (Sweden)

    Jiban Podder

    2013-08-01

    Full Text Available The title compound, C16H16FNO3, exists in a trans configuration with respect to the C=N bond [1.258 (2 Å]. The central methoxy O atom deviates from the plane of the attached benzene ring by 0.0911 (14 Å. The dihedral angle between the aromatic rings is 47.58 (11°. The crystal structure features C—H...N and C—H...O interactions.

  10. Prenatal exposure to paracetamol/acetaminophen and precursor aniline impairs masculinisation of male brain and behaviour

    OpenAIRE

    Hay-Schmidt , Anders; Finkielman , Olivia T. Ejlstrup; Jensen , Benjamin A. H.; Høgsbro , Christine F.; Bak Holm , Jacob; Johansen , Kristoffer Haurum; Jensen , Tina Kold; Andrade , Anderson Martino; Swan , Shanna H.; Bornehag , Carl-Gustaf; Brunak , Soren; Jégou , Bernard; Kristiansen , Karsten; Kristensen , David Møbjerg

    2017-01-01

    International audience; Paracetamol/acetaminophen (N-Acetyl-p-Aminophenol; APAP) is the preferred analgesic for pain relief and fever during pregnancy. It has therefore caused concern that several studies have reported that prenatal exposure to APAP results in developmental alterations in both the reproductive tract and the brain. Genitals and nervous system of male mammals are actively masculinised during foetal development and early postnatal life by the combined actions of prostaglandins a...

  11. Polyaniline/silver nanocomposites synthesized via UV-Vis-Assisted aniline polymerization with a reversed micellar microemulsion system

    NARCIS (Netherlands)

    Li, Z.; Li, Y.; Lin, W.; Zheng, F.; Laven, J.

    Polyaniline (PANI)/silver (Ag) nanocomposites were successfully synthesized within a sodium dodecyl sulfate reverse micro-emulsion system and characterized by Fourier transform infrared spectroscopy, X-ray diffraction, ultraviolet spectrometry, thermogravimetric analysis, scanning electron

  12. Colloidal dispersions of conducting copolymers of aniline and p-phenylenediamine for films with enhanced conductometric sensitivity to temperature

    Czech Academy of Sciences Publication Activity Database

    Li, Yu; Bober, Patrycja; Trchová, Miroslava; Stejskal, Jaroslav

    2017-01-01

    Roč. 5, č. 7 (2017), s. 1668-1674 ISSN 2050-7526 R&D Projects: GA ČR(CZ) GP14-05568P Institutional support: RVO:61389013 Keywords : colloids * polyaniline * poly(p-phenylenediamine) Subject RIV: JI - Composite Materials OBOR OECD: Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics Impact factor: 5.256, year: 2016

  13. Electrical transport properties of poly(aniline-co-p-phenylenediamine) and its composites with incorporated silver particles

    Czech Academy of Sciences Publication Activity Database

    Moučka, R.; Mrlík, M.; Ilčíková, M.; Špitalský, Z.; Kazantseva, N.; Bober, Patrycja; Stejskal, Jaroslav

    2013-01-01

    Roč. 67, č. 8 (2013), s. 1012-1019 ISSN 0366-6352 R&D Projects: GA ČR GA202/09/1626 Institutional support: RVO:61389013 Keywords : polyaniline * silver * poly(p-phenylenediamine) Subject RIV: JI - Composite Materials Impact factor: 1.193, year: 2013

  14. Evaluation of the effects of a polyurethane carrier on the degradation of chlorinated anilines by Pseudomonas acidovorans CA50

    International Nuclear Information System (INIS)

    Loidl, M.; Stockinger, J.; Hinteregger, C.; Streichsbier, F.

    1994-01-01

    A previously described model system for the treatment of harzardous chloroaniline-containing waste waters using immobilized bacterial cells in a bioreactor was enhanced in its degradation efficiency. This was achieved by the substitution of the calcium alginate beads by an inert polyurethane (PU)-carrier. The supply of chloroaniline-polluted waste waters with the PU-carrier (1.25% w/v) resulted in a distinct decrease of the pollutant concentrations in the solution due to the effects of adsorption. Nevertheless, the initially bound amounts of the chloroanilines, were also degraded, which was proved by the chloride balance. In comparative batch-degradation experiments with the Pseudomonas acidovorans strain CA50 with and without the addition of the PU-carrier (1.25% v/w), respectively, the advantages of the PU-supplied treatment system were demonstrated; among others a marked shortening of the degradation periods was achieved. The advantage of the PU-carrier was also shown by using a bubble reactor. In this connection, it is particularly worth mentioning, that high degradation rates can be achieved for a long time even for strongly persistent pollutants. (orig.)

  15. Continuous treatment of N-Methyl-p-nitro aniline (MNA) in an Upflow Anaerobic Sludge Blanket (UASB) bioreactor

    Science.gov (United States)

    Olivares, Christopher I.; Wang, Junqin; Silva Luna, Carlos D.; Field, Jim A.; Abrell, Leif; Sierra-Alvarez, Reyes

    2017-01-01

    N-methyl-p-nitroaniline (MNA) is an ingredient of insensitive munitions (IM) compounds that serves as a plasticizer and helps reduce unwanted detonations. As its use becomes widespread, MNA waste streams will be generated, necessitating viable treatment options. We studied MNA biodegradation and its inhibition potential to, a representative anaerobic microbial population in wastewater treatment, methanogens. Anaerobic biodegradation and toxicity assays were performed and an up-flow anaerobic sludge blanket reactor (UASB) was operated to test continuous degradation of MNA. MNA was transformed almost stoichiometrically to N-methyl-p-phenylenediamine (MPD). MPD was not mineralized, however, it was readily autoxidized and polymerized extensively upon aeration at pH = 9. In the UASB reactor, MNA was fully degraded up to a loading rate of 297.5 μM MNA d-1). Regarding toxicity, MNA was very inhibitory to acetoclastic methanogens (IC50 = 103 μM) whereas MPD was much less toxic, causing only 13.9% inhibition at the highest concentration tested (1025 μM). The results taken as a whole indicate that anaerobic sludge can transform MNA to MPD continuously, and that the transformation decreases the cytotoxicity of the parent pollutant. MPD can be removed through extensive polymerization. These insights could help define efficient treatment options for waste streams polluted with MNA. PMID:26454121

  16. Grafting of aniline derivatives onto chitosan and their applications for removal of reactive dyes from industrial effluents.

    Science.gov (United States)

    Abbasian, Mojtaba; Jaymand, Mehdi; Niroomand, Pouneh; Farnoudian-Habibi, Amir; Karaj-Abad, Saber Ghasemi

    2017-02-01

    A series of chitosan-grafted polyaniline derivatives {chitosan-g-polyaniline (CS-g-PANI), chitosan-g-poly(N-methylaniline) (CS-g-PNMANI), and chitosan-g-poly(N-ethylaniline) (CS-g-PNEANI)} were synthesized by in situ chemical oxidation polymerization method. The synthesized copolymers were analyzed by means of Fourier transform infrared (FTIR), and ultraviolet-visible (UV-vis) spectroscopies, thermogravimetric analysis (TGA), and field emission scanning electron microscopy (FE-SEM). These copolymers were applied as adsorbent for removal of acid red 4 (AR4) and direct red 23 (DR23) from aqueous solutions. The adsorption processes were optimized in terms of pH, adsorbent amount, and dyes concentrations. The maximum adsorption capacities (Q m ) for the synthesized copolymers were calculated, and among them the CS-g-PNEANI sample showed highest Q m for both AR4 (98mgg -1 ) and DR23 (112mgg -1 ) dyes. The adsorption kinetics of AR4 and DR23 dyes follow the pseudo-second order kinetic model. The regeneration and reusability tests revealed that the synthesized adsorbents had the relatively good reusability after five repetitions of the adsorption-desorption cycles. As the results, it is expected that the CS-g-PANIs find application for removal of reactive dyes (especially anionic dyes) from industrial effluents mainly due to their low production costs and high adsorption effectiveness. Copyright © 2016 Elsevier B.V. All rights reserved.

  17. Polyaniline–silver composites prepared by the oxidation of aniline with silver nitrate in solutions of sulfonic acids

    Czech Academy of Sciences Publication Activity Database

    Bober, Patrycja; Trchová, Miroslava; Prokeš, J.; Varga, M.; Stejskal, Jaroslav

    2011-01-01

    Roč. 56, č. 10 (2011), s. 3580-3585 ISSN 0013-4686 R&D Projects: GA AV ČR IAA400500905; GA AV ČR IAA100500902; GA ČR GA203/08/0686 Institutional research plan: CEZ:AV0Z40500505 Keywords : conductivity * polyaniline * silver Subject RIV: CD - Macromolecular Chemistry Impact factor: 3.832, year: 2011

  18. Study of the synthesis method and stability response of the doped poly aniline used for dosimetric applications

    International Nuclear Information System (INIS)

    Pacheco, Ana P.L.; Araujo, Elmo S.; Azevedo, Walter M. de

    2002-01-01

    Preliminary studies indicated that PANI is a suitable material for the use in the dosimetry area. Experimental results indicate that the conductivity properties of the polymer is affected by the absorbed dose. In that reason it is possible to quantify the dose, analyzing the variation of the electrical resistance of the polymer as a function of the dose. However, to use this material in the dosimetry area it is necessary to studies the response stability of the material along the time, before and after the irradiation. In this work we will show the study of the stability behavior of PANI, during its life time. For that we will use films of doped PANI, synthesized by different methodologies and conditioned in different temperature and humidity conditions. This study is important because we can define which is the best synthesis method to produce PANI films that can be used for making devices to be used in dosimetric applications, as well as, the best conditions those devices should be conditioned before its irradiation. (author)

  19. Oxidation of aniline with silver nitrate accelerated by p-phenylenediamine: A new route to conducting composites

    Czech Academy of Sciences Publication Activity Database

    Bober, Patrycja; Stejskal, Jaroslav; Trchová, Miroslava; Prokeš, J.; Sapurina, I.

    2010-01-01

    Roč. 43, č. 24 (2010), s. 10406-10413 ISSN 0024-9297 R&D Projects: GA AV ČR IAA400500905; GA AV ČR IAA100500902; GA ČR GA203/08/0686; GA MŠk ME 847 Institutional research plan: CEZ:AV0Z40500505 Keywords : polyaniline * p-phenylenediamine * silver Subject RIV: CD - Macromolecular Chemistry Impact factor: 4.838, year: 2010

  20. Preparation and Properties of Isomeric N-(4-substituted Benzylidene)-4-ethynylanilines and 4-substituted N-(4-ethynylbenzylidene) Anilines

    Czech Academy of Sciences Publication Activity Database

    Balcar, Hynek; Čejka, Jiří; Kubišta, Jiří; Petrusová, Lidmila; Kubát, Pavel; Blechta, Vratislav

    2000-01-01

    Roč. 65, č. 2 (2000), s. 203-215 ISSN 0010-0765 R&D Projects: GA ČR GA203/98/1165 Institutional research plan: CEZ:AV0Z4040901; CEZ:A54/98:Z4-040-9-ii Subject RIV: CF - Physical ; Theoretical Chemistry Impact factor: 0.960, year: 2000

  1. Binding of substituted phenol and aniline derivatives to the corn protein zein studied by high-performance liquid chromatography

    Czech Academy of Sciences Publication Activity Database

    Forgács, E.; Cserháti, T.; Deyl, Zdeněk; Mikšík, Ivan

    2001-01-01

    Roč. 753, č. 1 (2001), s. 79-86 ISSN 0378-4347 R&D Projects: GA ČR GA203/99/0191 Institutional research plan: CEZ:AV0Z5011922 Keywords : zein * phenol * anylin Subject RIV: BH - Optics, Masers, Lasers Impact factor: 1.911, year: 2001

  2. Effect of the pH on the oxidative polymerization of aniline and the morphology and properties of the products

    Czech Academy of Sciences Publication Activity Database

    Sapurina, I. Yu.; Stejskal, Jaroslav

    2010-01-01

    Roč. 79, č. 12 (2010), s. 1218-1239 ISSN 0042-1308 R&D Projects: GA MŠk ME 847 Institutional research plan: CEZ:AV0Z40500505 Keywords : polyaniline * conducting polymer * nanotube Subject RIV: CD - Macromolecular Chemistry Impact factor: 1.832, year: 2008

  3. Oxidative Heck Reaction as a Tool for Para-selective Olefination of Aniline: A DFT Supported Mechanism.

    Science.gov (United States)

    Moghaddam, Firouz Matloubi; Pourkaveh, Raheleh; Karimi, Ashkan

    2017-10-06

    This study describes the first para-selective palladium-catalyzed alkenylation of tertiary amines. This regioselective C-H activation was conducted without any chelation moieties. A series of olefins were reacted under mild reaction conditions at 60 °C, and the corresponding products were obtained in good yields with high selectivity.

  4. Crystal structure and computational study of 2,4-dichloro-N-[(E-(5-nitrothiophen-2-ylmethylidene]aniline

    Directory of Open Access Journals (Sweden)

    Yavuz Köysal

    2016-08-01

    Full Text Available The title compound, C11H6Cl2N2O2S, is a Schiff base that incorporates an N-bound 2,4-dichlorophenyl and a C-bound 5-nitrothiophene ring. The molecule is approximately planar, the maximum deviation from the mean plane being 0.233 (4 Å for the C=N N atom. The dihedral angle between the benzene and thiophene rings is 9.7 (2°. The C=N double bond has an E configuration. The crystal structure features C—H...O hydrogen bonds,forming sheets parallel to (10-1, and π–π stacking interactions between symmetry-related thiophene and benzene rings, in which the distance between adjacent ring centroids is 3.707 (4 Å, forming a three-dimensional supramolecular structure. Geometric parameters from quantum-chemical calculations are in good agreement with experimental X-ray diffraction results.

  5. Comparitive Study on Volatile Aroma Compounds of Two Different ...

    African Journals Online (AJOL)

    Kastamonu And Chinese) Using Gas Chromatography Mass Spectrometry ... African Journal of Traditional, Complementary and Alternative Medicines ... Key words: Allium sativum, dially disulfide, di-2-propenyl trisulfide, medicinal plant ...

  6. Protonation of 1-alkyl-2-allyllithium-0-carboranes and 1-methyl-2-allylmaonesium chloride-0-carborane

    International Nuclear Information System (INIS)

    Ivanova, N.N.; Kazantsev, A.V.; Zakharkin, L.I.

    1975-01-01

    The ratio of 1-alkyl-2-allyl and 1-alkyl-2-propenyl-0-carboranes generated in protonation of 1-alkyl-2-lithium allyl-0-carboranes with various protolytic agents in ether, THF and liquid ammonia depends on the nature of protolytic agent and solvent. The rat:o of these allyl and propenyl isomers is also affected by steric effects of the protolytic agent and 0-carborane nucleus

  7. 40 CFR 180.470 - Acetochlor; tolerances for residues.

    Science.gov (United States)

    2010-07-01

    ...'-methyl-6-ethyl-N-ethoxymethylacetanilide, and its metabolites containing the ethyl methyl aniline (EMA) moiety and the hydroxyethyl methyl aniline (HEMA) moiety. Both parent and the named metabolites shall be determined as ethyl methyl aniline (EMA) and hydroxyethyl methyl aniline (HEMA), and calculated as the...

  8. UV-vis, IR and 1H NMR spectroscopic studies of some mono- and bis-azo-compounds based on 2,7-dihydroxynaphthalene and aniline derivatives

    Science.gov (United States)

    Issa, Raafat M.; Fayed, Tarek A.; Awad, Mohammed K.; El-Kony, Sanaa M.

    2005-12-01

    The absorption spectra of mono- and bis-azo-derivatives obtained by coupling the diazonium salts of aromatic amines and 2,7-dihydroxynaphthalene have been studied in six organic solvents. The different absorption bands have been assigned and the effect of solvents on the charge transfer band is also discussed. The diagnostic IR spectral bands and 1H NMR signals are assigned and discussed in relation to molecular structure. Also, semi-empirical molecular orbital calculations using the atom superposition and electron delocalization molecular orbital (ASED-MO) theory have been performed to investigate the molecular and electronic structures of these compounds. According to these calculations, an intramolecular hydrogen bonding is essential for stabilization of such molecules.

  9. [4-Bromo-N-(pyridin-2-ylmethylidene)aniline-κ2N,N']iodido(triphenylphosphane-κP )copper(I)

    Czech Academy of Sciences Publication Activity Database

    Khalaji, A.D.; Bahramian, B.; Jafari, K.; Fejfarová, Karla; Dušek, Michal

    2012-01-01

    Roč. 68, č. 7 (2012), "m1001"-"sup7" ISSN 1600-5368 Grant - others:AV ČR(CZ) Praemium Academiae Institutional research plan: CEZ:AV0Z10100521 Keywords : x-ray diffraction * structure analysis * weak interactions Subject RIV: BM - Solid Matter Physics ; Magnetism Impact factor: 0.347, year: 2011

  10. Synthesis, growth and characterization of 4-bromo-4'-nitrobenzylidene aniline (BNBA): a novel nonlinear optical material with a (3+1)-dimensional incommensurately modulated structure

    Czech Academy of Sciences Publication Activity Database

    Subashini, A.; Leela, S.; Ramamurthi, K.; Arakcheeva, A.; Stoeckli-Evans, H.; Petříček, Václav; Chapuis, G.; Pattison, P.; Reji, P.

    2013-01-01

    Roč. 15, č. 13 (2013), s. 2474-2481 ISSN 1466-8033 Grant - others:AV ČR(CZ) AP0701 Program:Akademická prémie - Praemium Academiae Institutional support: RVO:68378271 Keywords : organic nonlinear optical material * crystal structure analysis * incommensurately modulated structures Subject RIV: BM - Solid Matter Physics ; Magnetism Impact factor: 3.858, year: 2013

  11. Atomic-Level Organization of Vicinal Acid-Base Pairs through the Chemisorption of Aniline and Derivatives onto Mesoporous SBA15

    KAUST Repository

    Basset, Jean-Marie; Hamzaoui, Bilel; Bendjeriou-Sedjerari, Anissa; Pump, Eva; Abou-Hamad, Edy; Sougrat, Rachid; Gurinov, Andrei; Huang, Kuo-Wei; Gajan, David; Lesage, Anne; Emsley, Lyndon

    2016-01-01

    by opening siloxane bridges leading to N-phenylsilanamine-silanol pairs. In contrast with ammonia treated surfaces, the material is stable under air/moisture. Advanced solid state MAS NMR: 2D ¹H-¹H double-quantum, ¹H-¹³C HETCOR experiments and dynamic nuclear

  12. Single-step reinforced microextraction of polycyclic aromatic hydrocarbons from soil samples using an inside needle capillary adsorption trap with electropolymerized aniline/multi-walled carbon nanotube sorbent.

    Science.gov (United States)

    Ghiasvand, Ali Reza; Yazdankhah, Fatemeh

    2017-03-03

    A polyaniline/multi-wall carbon nanotubes (PANI/MWCNT) composite was electrodeposited on the interior surface of a platinized stainless steel capillary needle and used to prepare an inside needle capillary adsorption trap (INCAT) device. The platinization expanded the interior adsorbing surface of the needle and made it more porous and cohesive for nanocomposite film. The nanocomposite was characterized using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). The fabricated INCAT was fixed into a cooling capsule to fabricate a cooling-assisted INCAT (CA-INCAT) system. The CA-INCAT device was used to extract polycyclic aromatic hydrocarbons (PAHs) from solid samples followed by gas chromatography-flame ionization detection (GC-FID) determination. To obtain the best extraction efficiency, the important experimental variables were studied and optimized. Under the optimal conditions, the limits of detection (LODs) for the studied PAHs were in the range of 0.002-0.02ngg -1 . Linear dynamic ranges (LDRs) for the calibration curves were found to be 0.1-30,000ngg -1 . Relative standard deviations (RSDs%) for six replicated analysis of 1ngg -1 PAHs were obtained 7.7-11%. The CA-INCAT-GC-FID method was successfully applied for the extraction and determination of PAHs in contaminated soil samples. The results were in agreement with those obtained by a validated ultrasound-assisted solvent extraction (UA-SE) method. Copyright © 2017 Elsevier B.V. All rights reserved.

  13. Removal of organic micro-pollutants (phenol, aniline and nitrobenzene) via forward osmosis (FO) process: Evaluation of FO as an alternative method to reverse osmosis (RO)

    KAUST Repository

    Cui, Yue; Liu, Xiang-Yang; Chung, Neal Tai-Shung; Weber, Martin; Staudt, Claudia; Maletzko, Christian

    2016-01-01

    under the RO mode. In addition, the rejection can be maintained even when treating a more concentrated feed solution (2000 ppm). The removal performance can be further enhanced by using a more concentrated draw solution (2 M). The water flux is almost

  14. Polymerization of aniline: in the solutions of strong and weak acids: The evolution of infrared spectra and their interpretation using factor analysis

    Czech Academy of Sciences Publication Activity Database

    Šeděnková, Ivana; Trchová, Miroslava; Stejskal, Jaroslav; Bok, J.

    2007-01-01

    Roč. 61, č. 11 (2007), s. 1153-1162 ISSN 0003-7028 R&D Projects: GA AV ČR IAA4050313; GA AV ČR IAA400500504 Institutional research plan: CEZ:AV0Z40500505 Keywords : conducting polymer * thin films * polyaniline Subject RIV: CD - Macromolecular Chemistry Impact factor: 1.902, year: 2007

  15. Applications of ortho-phenylisonitrile and ortho-N-Boc aniline for the two-step preparation of novel bis-heterocyclic chemotypes.

    Science.gov (United States)

    Xu, Zhigang; Shaw, Arthur Y; Nichol, Gary S; Cappelli, Alexandra P; Hulme, Christopher

    2012-08-01

    Concise routes to five pharmacologically relevant bis-heterocyclic scaffolds are described. Significant molecular complexity is generated in a mere two synthetic operations enabling access to each scaffold. Routes are often improved by microwave irradiation and all utilize isocyanide-based multi-component reaction methods to incorporate the required diversity elements. Common reagents in all initial condensation reactions include 2-(N-Boc-amino)-phenyl-isocyanide 1, mono-Boc-phenylenediamine 2 and ethyl glyoxalate 3.

  16. Advantageous Microwave-Assisted Suzuki Polycondensation for the Synthesis of Aniline-Fluorene Alternate Copolymers as Molecular Model with Solvent Sensing Properties

    Directory of Open Access Journals (Sweden)

    Rebeca Vázquez-Guilló

    2018-02-01

    Full Text Available Polymerization via Suzuki coupling under microwave (µW irradiation has been studied for the synthesis of poly{1,4-(2/3-aminobenzene-alt-2,7-(9,9-dihexylfluorene} (PAF, chosen as molecular model. Briefly, µW-assisted procedures accelerated by two orders of magnitude the time required when using classical polymerization processes, and the production yield was increased (>95%. In contrast, although the sizes of the polymers that were obtained by non-conventional heating reactions were reproducible and adequate for most applications, with this methodology the molecular weight of final polymers were not increased with respect to conventional heating. Asymmetric orientation of the amine group within the monomer and the assignments of each dyad or regioregularity, whose values ranged from 38% to 95% with this molecule, were analysed using common NMR spectroscopic data. Additionally, the synthesis of a new cationic polyelectrolyte, poly{1,4-(2/3-aminobenzene-co-alt-2,7-[9,9´-bis(6’’-N,N,N-trimethylammonium-hexylfluorene]} dibromide (PAFAm, from poly{1,4-(2/3-aminobenzene-co-alt-2,7-[9,9´-bis(6’’-bromohexylfluorene]} (PAFBr by using previously optimized conditions for µW-assisted heating procedures was reported. Finally, the characterization of the final products from these batches showed unkown interesting solvatochromic properties of the PAF molecule. The study of the solvatochromism phenomena, which was investigated as a function of the polarity of the solvents, showed a well-defined Lippert correlation, indicating that the emission shift observed in PAF might be due to its interaction with surrounding environment. Proven high sensitivity to changes of its environment makes PAF a promising candidate of sensing applications.

  17. Effects of toxic organic flotation reagent (aniline aerofloat) on an A/O submerged membrane bioreactor (sMBR): Microbial community dynamics and performance.

    Science.gov (United States)

    Lin, Weixiong; Sun, Shuiyu; Wu, Chun; Xu, Pingting; Ye, Ziwei; Zhuang, Shengwei

    2017-08-01

    Bio-treatment of flotation wastewater has been proven to be both effective and economical, as a treatment method. Despite this, little is known regarding the effects of toxic organic floatation reagents such as Dianilinodithiophosphoric acid (DDA), on the microbial community performance or dynamics, which are critical to the effective performance of the bio-treatment reactor. A submerged membrane bioreactor (sMBR) was constructed to continuously treat simulated wastewater contaminated with DDA, an organic flotation reagent that is now considered a significant pollutant. The performance of the sMBR system was investigated at different DDA loading concentrations, with assessment of the effects of DDA on the microbial communities within the sMBR, in particular the biodiversity and succession within the microbial community. Results showed that, with increased DDA loadings, the performance of the sMBR was initially negatively affected, but the system adapted efficiently and consistently reached a COD removal rate of up to 80%. Increased DDA loading concentrations had an adverse effect on the activity of both the activated sludge and microbial communities, resulting in a large alteration in microbial dynamics, especially during the start-up stage and the high DDA loading stage. Strains capable of adapting to the presence of DDA, capable of degrading DDA or utilizing its byproducts, were enriched within the sMBR community, such as Zoogloea, Clostridium, Sideroxydans lithotrophicus, Thiobacillus, Thauera amino aromatica and Alicycliphilus denitrificans. Copyright © 2017 Elsevier Inc. All rights reserved.

  18. Ablation and formation by plasma of silver metallic films on poly aniline; Ablacion y formacion por plasma de peliculas metalicas de plata sobre polianilina

    Energy Technology Data Exchange (ETDEWEB)

    Palacios, J.C.; Olayo, G.; Morales, J.; Cruz, G.J. [Posgrado en Materiales, Facultad de Quimica, UAEM, Paseo Colon esq. Tollocan, Toluca, Estado de Mexico, C.P. 50000 (Mexico)

    2000-07-01

    This work shows a study about the ablation by plasma conditions in which is possible to form silver layers over polymeric surfaces with the purpose to increase the electric conductivity of the surface. The adhesion between layers formed by polymerization and ablation by plasma respectively is high, with this it is possible to find adequate conditions for getting the polymerization and ablation simultaneously forming with this a thin polymer matrix which would have metallic elements dispersed in its structure. (Author)

  19. Polyaniline-silver composites prepared by the oxidation of aniline with mixed oxidants, silver nitrate and ammonium peroxydisulfate: the control of silver content

    Czech Academy of Sciences Publication Activity Database

    Bober, Patrycja; Stejskal, Jaroslav; Trchová, Miroslava; Prokeš, J.

    2011-01-01

    Roč. 52, č. 26 (2011), s. 5947-5952 ISSN 0032-3861 R&D Projects: GA AV ČR IAA400500905; GA AV ČR IAA100500902; GA MŠk LA09028 Institutional research plan: CEZ:AV0Z40500505 Keywords : conducting polymer * polyaniline * silver Subject RIV: CD - Macromolecular Chemistry Impact factor: 3.438, year: 2011

  20. (Z)-N-[1-(Aziridin-1-yl)-2,2,2-tri­fluoro­ethyl­idene]-4-bromo­aniline

    OpenAIRE

    Bunev, Alexander S.; Vasiliev, Maksim A.; Ostapenko, Gennady I.; Peregudov, Alexander S.; Khrustalev, Victor N.

    2014-01-01

    The title compound, C10H8BrF3N2, crystallizes with two independent mol­ecules in the asymmetric unit, which can be considered as being related by a pseudo-inversion center, so their conformations are different; the corresponding N=C—N—C torsion angles are 54.6 (5) and −50.5 (5)°. In the crystal, mol­ecules related by translation in [001] inter­act through short inter­molecular Br⋯F contacts [3.276 (2) and 3.284 (2) Å], thus forming two types of crystallographically independent chains....

  1. Synthesis and Crystal Structure of Di-μ-chlorido-bis{chlorido[4-ethyl- N-(pyridin-2-ylmethylidene-κ N)aniline-κ N]mercury(II)}

    Science.gov (United States)

    Khalaj, M.; Seftejani, F. B.; Ghazanfarpour-Darjani, M.; Lalegani, A.

    2017-12-01

    The centrosymmetric dinuclear title complex [Hg2Cl4(dip)2] was synthesized using the Schiff base bidentate ligand (E)-4-ethyl- N-(pyridine-2-ylmethylene)benzeneamine ( dip) and mercury(II) chloride salts. It has been characterized by elemental analysis, X-ray diffraction, and UV-Visible and infrared spectroscopic techniques. The X-ray analysis shows that the title compound crystallizes in the monoclinic sp. gr. P21/n, Z = 2 with a = 7.8233(17) Å, b = 15.178(3) Å, c = 12.559(3) Å, β = 97.021(3)°. The Hg(II) ion has a distorted trigonal-bipyramidal coordination environment formed by the bischelating N-heterocyclic ligands, two bridging Cl atoms and one terminal Cl atom.

  2. SYNTHESIS, CHARACTERIZATION AND DENSITY FUNCTIONAL ...

    African Journals Online (AJOL)

    Preferred Customer

    We synthesized a number of aniline derivatives containing acyl groups to compare their barriers of rotation around ... KEY WORDS: Monoacyl aniline, Synthesis, Density functional theory, Rotation barrier. INTRODUCTION. Developments in ...

  3. Hypolipidaemic and antiplatelet activity of phenoxyacetic acid derivatives related to alpha-asarone.

    Science.gov (United States)

    Pérez-Pastén, Ricardo; García, Rosa Virginia; Garduño, Leticia; Reyes, Elba; Labarrios, Fernando; Tamariz, Joaquín; Chamorro, Germán

    2006-10-01

    The phenoxyacetic acid derivatives 1-6 [2-methoxy-4-(2-propenyl)phenoxyacetic acid (1); 2-methoxy-5-nitro-4-(2-propenyl)phenoxyacetic acid (2); methyl 2-methoxy-4-(2-propenyl)phenoxyacetate (3); ethyl 2-methoxy-4-(2-propenyl)phenoxyacetate (4); methyl 2-methoxy-5-nitro-4-(2-propenyl)phenoxyacetate (5); ethyl 2-methoxy-5-nitro-4-(2-propenyl)phenoxyacetate (6)] related to alpha-asarone have been reported previously as hypolipidaemic agents in diet-induced hyperlipidaemic mice. We have aimed to expand the pharmacological profile of these derivatives by investigating their hypolipidaemic activity in rats and mice under different experimental conditions. The antiplatelet activity was tested also in-vitro from blood derived from consenting healthy volunteers. In normolipidaemic rats, compounds 2, 3 and 5 at oral doses of 40 and 80 mg kg(-1) significantly decreased total cholesterol and LDL-cholesterol levels. Moreover, analogues 3 and 5 administered to hypercholesterolaemic rats at the same doses for seven days also produced a reduction in the content of these same lipoproteins. In neither case were the high-density lipoprotein cholesterol and triglyceride concentrations affected. However, practically all tested compounds were found to be hypocholesterolaemic agents, and were shown to effectively lower low-density lipoprotein cholesterol and triglyceride levels in Triton-induced hyperlipidaemic mice at oral doses of 50 and 100 mg kg(-1). In all tests, all animals appeared to be healthy throughout the experimental period in their therapeutic ranges. Triton-induced hypercholesterolaemic mice appeared to be a desirable model for this class of hypolipidaemic drugs. On the other hand, compounds 1, 2, 4 and 5 significantly inhibited ADP-induced aggregation in-vitro. These findings indicated that all of these compounds appeared to be promising for the treatment of human hyperlipidaemia and thrombotic diseases.

  4. Synthesis of novel synthetic intermediates from the reaction of benzimidazole and triazole carbenes with ketenimines and their application in the construction of spiro-pyrroles.

    Science.gov (United States)

    Mo, Jun-Ming; Ma, Yang-Guang; Cheng, Ying

    2009-12-07

    2-(2-Alkoxycarbonyl-1-arylamino-1-propenyl)benzimidazolium and 5-(2-alkoxycarbonyl-1-arylamino-1-propenyl)triazolium salts were synthesized in good yields from the reaction of benzimidazole and triazole carbenes with ketenimines. Upon treatment with a base, both salts were converted into novel 1,3-dipoles which underwent [3+2] cycloaddition reactions with electron-deficient alkynes and allenes to produce benzimidazole-spiro-pyrroles or triazole-spiro-pyrroles. This work provides novel synthons for the construction of multifunctional spiro-pyrrole derivatives that are not easy accessible by other synthetic methods and are potentially amenable to further transformations.

  5. Base free N-alkylation of anilines with ArCH2OH and transfer hydrogenation of aldehydes/ketones catalyzed by the complexes of η5-Cp*Ir(iii) with chalcogenated Schiff bases of anthracene-9-carbaldehyde.

    Science.gov (United States)

    Dubey, Pooja; Gupta, Sonu; Singh, Ajai K

    2018-03-12

    The condensation of anthracene-9-carbaldehyde with 2-(phenylthio/seleno)ethylamine results in Schiff bases [PhS(CH 2 ) 2 C[double bond, length as m-dash]N-9-C 14 H 9 ](L1) and [PhSe(CH 2 ) 2 C[double bond, length as m-dash]N-9-C 14 H 9 ] (L2). On their reaction with [(η 5 -Cp*)IrCl(μ-Cl)] 2 and CH 3 COONa at 50 °C followed by treatment with NH 4 PF 6 , iridacycles, [(η 5 -Cp*)Ir(L-H)][PF 6 ] (1: L = L1; 2: L = L2), result. The same reaction in the absence of CH 3 COONa gives complexes [(η 5 -Cp*)Ir(L)Cl][PF 6 ] (3-4) in which L = L1(3)/L2(4) ligates in a bidentate mode. The ligands and complexes were authenticated with HR-MS and NMR spectra [ 1 H, 13 C{ 1 H} and 77 Se{ 1 H} (in the case of L2 and its complexes only)]. Single crystal structures of L2 and half sandwich complexes 1-4 were established with X-ray crystallography. Three coordination sites of Ir in each complex are covered with η 5 -Cp* and on the remaining three, donor atoms present are: N, S/Se and C - /Cl - , resulting in a piano-stool structure. The moisture and air insensitive 1-4 act as efficient catalysts under mild conditions for base free N-alkylation of amines with benzyl alcohols and transfer hydrogenation (TH) of aldehydes/ketones. The optimum loading of 1-4 as a catalyst is 0.1-0.5 mol% for both the activations. The best reaction temperature is 80 °C for transfer hydrogenation and 100 °C for N-alkylation. The mercury poisoning test supports a homogeneous pathway for both the reactions catalyzed by 1-4. The two catalytic processes are most efficient with 3 followed by 4 > 1 > 2. The mechanism proposed on the basis of HR-MS of the reaction mixtures of the two catalytic processes taken after 1-2 h involves the formation of an alkoxy and hydrido species. The real catalytic species proposed in the case of iridacycles results due to the loss of the Cp* ring.

  6. CCDC 849283: Experimental Crystal Structure Determination : bis(N-(1-(6-(1H-pyrazol-1-yl)pyridin-2-yl)ethylidene)aniline)-cobalt tetrachloro-cobalt

    KAUST Repository

    Gong, Dirong

    2013-01-01

    An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

  7. CCDC 849284: Experimental Crystal Structure Determination : Dichloro-(2,6-diisopropyl-N-(1-(6-(1H-pyrazol-1-yl)pyridin-2-yl)ethylidene)aniline)-cobalt(ii)

    KAUST Repository

    Gong, Dirong

    2013-01-01

    An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

  8. Ferrocene-functionalized 4-(2,5-Di(thiophen-2-yl)-1H-pyrrol-1-yl)aniline: a novel design in conducting polymer-based electrochemical biosensors.

    Science.gov (United States)

    Ayranci, Rukiye; Demirkol, Dilek Odaci; Ak, Metin; Timur, Suna

    2015-01-13

    Herein, we report a novel ferrocenyldithiophosphonate functional conducting polymer and its use as an immobilization matrix in amperometric biosensor applications. Initially, 4-(2,5-di(thiophen-2-yl)-1H-pyrrol-1-yl)amidoferrocenyldithiophosphonate was synthesized and copolymerized with 4-(2,5-di(thiophen-2-yl)-1H-pyrrol-1-yl)benzenamine at graphite electrodes. The amino groups on the polymer were utilized for covalent attachment of the enzyme glucose oxidase. Besides, ferrocene on the backbone was used as a redox mediator during the electrochemical measurements. Prior to the analytical characterization, optimization studies were carried out. The changes in current signals at +0.45 V were proportional to glucose concentration from 0.5 to 5.0 mM. Finally, the resulting biosensor was applied for glucose analysis in real samples and the data were compared with the spectrophotometric Trinder method.

  9. Ruthenium-complex catalyzed N-(cyclo)alkylation of aromatic amines with diols. Selective synthesis of N-(n-hydroixyalkyl)anilines of type PhNH(CH2)nOH and of some bioactive arylpiperazines,

    NARCIS (Netherlands)

    Koten, G. van; Abbenhuis, R.A.T.M.; Boersma, J.

    1998-01-01

    A new class of well-defined neutral mono-, and dicationic ruthenium(II) complexes containing a neutral terdentate donor system [C5H3N(CH2E)(2)-2,6] (E = PPh2 (PNP) or NMe2 (NN'N)) has been found effective as catalyst precursor in N-(cyclo)alkylation reactions of aromatic amines with diols

  10. CCDC 849283: Experimental Crystal Structure Determination : bis(N-(1-(6-(1H-pyrazol-1-yl)pyridin-2-yl)ethylidene)aniline)-cobalt tetrachloro-cobalt

    KAUST Repository

    Gong, Dirong; Jia, Weiguo; Chen, Tao; Huang, Kuo-Wei

    2013-01-01

    An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from

  11. CCDC 849284: Experimental Crystal Structure Determination : Dichloro-(2,6-diisopropyl-N-(1-(6-(1H-pyrazol-1-yl)pyridin-2-yl)ethylidene)aniline)-cobalt(ii)

    KAUST Repository

    Gong, Dirong; Jia, Weiguo; Chen, Tao; Huang, Kuo-Wei

    2013-01-01

    An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from

  12. Dynamics of Neutral Cluster Growth and Cluster Ion Fragmentation for Toluene/Water, Aniline/Argon, and 4-Fluorostyrene/Argon Clusters: Covariance Mapping of the Mass Spectral Data

    National Research Council Canada - National Science Library

    Foltin, M

    1998-01-01

    .... To explore sensitivity of the parent ion/fragment ion correlation coefficient to cluster fragmentation, correlation coefficients are measured as a function of ionization photon energy as thresholds...

  13. Total Synthesis of Plukenetione A

    Science.gov (United States)

    Zhang, Qiang; Mitasev, Branko; Qi, Ji; Porco, John A.

    2010-01-01

    We describe an alkylative dearomatization/acid-mediated adamantane annulation sequence which allows facile access to type A polyprenylated acylphloroglucinol (PPAP) natural products including plukenetione A. Introduction of the 2-methyl-1-propenyl moiety was achieved via stereodivergent SN2 and SN1 cyclizations of allylic alcohol substrates. PMID:20843036

  14. Chalcogen-containing oxazolines in the palladium-catalyzed asymmetric allylic alkylation

    Directory of Open Access Journals (Sweden)

    Braga Antonio L.

    2006-01-01

    Full Text Available A comparative study about the ability of chiral chalcogen-containing oxazolines to act as chiral ligands in the palladium-catalyzed allylic alkylation of rac-1,3-diphenyl-2-propenyl acetate with dimethyl malonate is reported. Differences in the catalytic performance are observed with sulfur, selenium and tellurium analogues.

  15. Synthesis and in vitro and in vivo characteristics of an iodinated analogue of the beta-adrenoceptor antagonist carazolol

    NARCIS (Netherlands)

    Dubois, E. A.; van den Bos, J. C.; Doornbos, T.; van Doremalen, P. A.; Somsen, G. A.; Vekemans, J. A.; Janssen, A. G.; Batink, H. D.; Boer, G. J.; Pfaffendorf, M.; van Royen, E. A.; van Zwieten, P. A.

    1996-01-01

    A new (radio)iodinated, beta-adrenoceptor ligand, (S)-(-)-4-[3-[(1,1-dimethyl-3-iodo-(2E)-propenyl)-amino]-2- hydroxypropoxy]carbazole (CYBL8E, 1), was prepared. 1 is an iodinated analogue of the high-affinity beta-adrenoceptor antagonist carazolol (2). The asymmetric synthesis was achieved in four

  16. Silencing onion lachrymatory factor synthase causes a significant change in the sulfur secondary metabolite profile.

    Science.gov (United States)

    Eady, Colin C; Kamoi, Takahiro; Kato, Masahiro; Porter, Noel G; Davis, Sheree; Shaw, Martin; Kamoi, Akiko; Imai, Shinsuke

    2008-08-01

    Through a single genetic transformation in onion (Allium cepa), a crop recalcitrant to genetic transformation, we suppressed the lachrymatory factor synthase gene using RNA interference silencing in six plants. This reduced lachrymatory synthase activity by up to 1,544-fold, so that when wounded the onions produced significantly reduced levels of tear-inducing lachrymatory factor. We then confirmed, through a novel colorimetric assay, that this silencing had shifted the trans-S-1-propenyl-l-cysteine sulfoxide breakdown pathway so that more 1-propenyl sulfenic acid was converted into di-1-propenyl thiosulfinate. A consequence of this raised thiosulfinate level was a marked increase in the downstream production of a nonenzymatically produced zwiebelane isomer and other volatile sulfur compounds, di-1-propenyl disulfide and 2-mercapto-3,4-dimethyl-2,3-dihydrothiophene, which had previously been reported in trace amounts or had not been detected in onion. The consequences of this dramatic simultaneous down- and up-regulation of secondary sulfur products on the health and flavor attributes of the onion are discussed.

  17. In situ stabilizer formation from methacrylic acid macromonomers in emulsion polymerization

    NARCIS (Netherlands)

    Schreur-Piet, Ingeborg; Heuts, Johan P.A.

    2017-01-01

    Oligomers of methacrylic acid containing a propenyl ω-endgroup (i.e. MAA-macromonomers) were synthesized by cobalt-mediated catalytic chain transfer polymerization and used as precursors to stabilizers in emulsion polymerization. It was found that only in those polymerizations in which these

  18. Crystal Structure of N,N-bis-(3-Carbomethoxy-5-methyl-pyrazol-1-ylmethylaniline

    Directory of Open Access Journals (Sweden)

    Taibi Ben-Hadda

    2002-09-01

    Full Text Available The tripodal ligand N,N-bis-(3-carbomethoxy-5-methylpyrazol-1-ylmethyl aniline (2 has been prepared by the condensation of aniline with two equivalents of N-hydroxymethyl[3-carbomethoxy-5-methyl]pyrazole. The molecule consists of two structurally analogous 3-carbomethoxy-5-methylpyrazol-1-ylmethyl moieties, which adopt a transoidal conformation via a central aniline ring, suggesting that this tripodal ligand is highly flexible and could accommodate many metals by coordination.

  19. Effect of electrolytes on electrochromic properties and morphology of ...

    Indian Academy of Sciences (India)

    Administrator

    dimethoxy aniline) films. BUREERAT SUEPHATTHIMA1, NOPHAWAN PARADEE1, ANUVAT SIRIVAT1,* and. DATCHANEE PATTAVARAKORN2. 1The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok 10330, Thailand.

  20. Synthesis of [14C]-labelled AY-30,068

    International Nuclear Information System (INIS)

    Hicks, D.R.; Hangeland, J.J.; Mobilio, D.; DeLange, B.

    1988-01-01

    [ 14 C]AY-30,068 (cis-1,8-diethyl-2,3,4,9-tetrahydro-4-(2-propenyl)-1H-carbazole-1-acetic acid), a potent analgesic agent, was prepared by incorporating [ 14 C]methyl iodide via a Wittig reaction. The intermediate aldehyde was synthesized in six steps from cis-1-ethyl-2-oxo-4-(2-propenyl)cyclohexaneacetic acid methyl ester. Three batches of the [ 14 C]labelled AY-30,068 were produced, giving a combined overall yield of 9% from [ 14 C]methyl iodide sp. act. 51.2, 17.7 and 4.4 μCi/mg; 97.5, 98.3, and 98.6% radiochemical purity, respectively. (author)

  1. Production and characterization of antifungal compounds produced by Lactobacillus plantarum IMAU10014.

    Directory of Open Access Journals (Sweden)

    HaiKuan Wang

    Full Text Available Lactobacillus plantarum IMAU10014 was isolated from koumiss that produces a broad spectrum of antifungal compounds, all of which were active against plant pathogenic fungi in an agar plate assay. Two major antifungal compounds were extracted from the cell-free supernatant broth of L. plantarum IMAU10014. 3-phenyllactic acid and Benzeneacetic acid, 2-propenyl ester were carried out by HPLC, LC-MS, GC-MS, NMR analysis. It is the first report that lactic acid bacteria produce antifungal Benzeneacetic acid, 2-propenyl ester. Of these, the antifungal products also have a broad spectrum of antifungal activity, namely against Botrytis cinerea, Glomerella cingulate, Phytophthora drechsleri Tucker, Penicillium citrinum, Penicillium digitatum and Fusarium oxysporum, which was identified by the overlay and well-diffusion assay. F. oxysporum, P. citrinum and P. drechsleri Tucker were the most sensitive among molds.

  2. 3-Methyl-1-(prop-2-en-1-ylquinoxalin-2(1H-one

    Directory of Open Access Journals (Sweden)

    Youssef Ramli

    2010-07-01

    Full Text Available In the molecule of the title compound, C12H12N2O, the quinoxaline ring is planar with an r.m.s. deviation of 0.007 (15 Å. The dihedral angle between the quinoxaline and propenyl planes is 82.1 (2°. The crystal packing is stabilized by offset π–π stacking between the quinoxaline rings [centroid–centroid distance = 3.8832 (9 Å].

  3. Chemical composition, antioxidant and antimicrobial activities of essential oil obtained from Ferula assa-foetida oleo-gum-resin: effect of collection time.

    Science.gov (United States)

    Kavoosi, Gholamreza; Rowshan, Vahid

    2013-06-15

    The properties of essential oils obtained from Ferula assa-foetida oleo-gum-resins (OGRs) collectioned in three collections times in 15 June (OGR1), 30 June (OGR2) and 15 July (OGR3) 2011 was investigated. Essential oil from OGR1 was constituted high levels of (E)-1-propenyl sec-butyl disulfide (23.9%) and 10-epi-γ-eudesmol (15.1%). Essential oil from OGR2 was constituted high levels of (Z)-1-propenyl sec-butyl disulfide (27.7%) and (E)-1-propenyl sec-butyl disulfide (20.3%). Essential oil from OGR3 was constituted high levels of β-pinene (47.1%) and α-pinene (21.3%). Inhibitory concentration (IC50) for radical scavenging were 0.012-0.035, 0.025-0.047 and 0.035-0.066 mg/ml of essential oil obtained from OGR1, OGR2 and OGR3, respectively. Minimal inhibitory concentration (MIC) for Gram-positive and Gram-negative bacteria and fungi grpwth were 0.028-0.111, 0.027-0.107 and 0.018-0.058 mg/ml of essential oil obtained from OGR1, OGR2 and OGR3, respectively. Essential oils obtained from different OGRs have different composition and biological activity thus have different applications in food and health industry. Crown Copyright © 2012. Published by Elsevier Ltd. All rights reserved.

  4. Chemical composition and phagocyte immunomodulatory activity of Ferula iliensis essential oils.

    Science.gov (United States)

    Özek, Gulmira; Schepetkin, Igor A; Utegenova, Gulzhakhan A; Kirpotina, Liliya N; Andrei, Spencer R; Özek, Temel; Başer, Kemal Hüsnü Can; Abidkulova, Karime T; Kushnarenko, Svetlana V; Khlebnikov, Andrei I; Damron, Derek S; Quinn, Mark T

    2017-06-01

    Essential oil extracts from Ferula iliensis have been used traditionally in Kazakhstan for treatment of inflammation and other illnesses. Because little is known about the biologic activity of these essential oils that contributes to their therapeutic properties, we analyzed their chemical composition and evaluated their phagocyte immunomodulatory activity. The main components of the extracted essential oils were ( E )-propenyl sec -butyl disulfide (15.7-39.4%) and ( Z )-propenyl sec -butyl disulfide (23.4-45.0%). Ferula essential oils stimulated [Ca 2+ ] i mobilization in human neutrophils and activated ROS production in human neutrophils and murine bone marrow phagocytes. Activation of human neutrophil [Ca 2+ ] i flux by Ferula essential oils was dose-dependently inhibited by capsazepine, a TRPV1 channel antagonist, indicating that TRPV1 channels mediate this response. Furthermore, Ferula essential oils stimulated Ca 2+ influx in TRPV1 channel-transfected HEK293 cells and desensitized the capsaicin-induced response in these cells. Additional molecular modeling with known TRPV1 channel agonists suggested that the active component is likely to be ( Z )-propenyl sec -butyl disulfide. Our results provide a cellular and molecular basis to explain at least part of the beneficial therapeutic properties of FEOs. © Society for Leukocyte Biology.

  5. A biobased nitrogen-containing lubricant additive synthesized from expoxidized methyl oleate using an ionic liquid catalyst

    Science.gov (United States)

    Utilizing an epoxidation route, an aniline adduct was synthesized from methyl oleate. An ionic liquid, 1-methylimidazolium tetrafluoroborate, was found to be the key for this catalytic system. The reaction produces a product with the aniline incorporated into the fatty chain, at the 9(10) position, ...

  6. Conjugated polyaniline as a result of the benzidine rearrangement

    Czech Academy of Sciences Publication Activity Database

    Sapurina, Irina; Tenkovtsev, A. V.; Stejskal, Jaroslav

    2015-01-01

    Roč. 64, č. 4 (2015), s. 453-465 ISSN 0959-8103 R&D Projects: GA MŠk(CZ) LH14199; GA ČR(CZ) GA13-00270S Institutional support: RVO:61389013 Keywords : aniline * aniline oligomers * benzidine rearrangement Subject RIV: CD - Macromolecular Chemistry Impact factor: 2.414, year: 2015

  7. In situ infrared spectroscopy of oligoaniline intermediates created under alkaline conditions

    Czech Academy of Sciences Publication Activity Database

    Šeděnková, Ivana; Stejskal, Jaroslav; Trchová, Miroslava

    2014-01-01

    Roč. 118, č. 51 (2014), s. 14972-14981 ISSN 1520-6106 R&D Projects: GA ČR GAP205/12/0911 Institutional support: RVO:61389013 Keywords : aniline oligomers * microspheres * aniline oxidation Subject RIV: CD - Macromolecular Chemistry Impact factor: 3.302, year: 2014

  8. Inhibition of Corrosion of Zinc in (HNO 3 + HCl) acid mixture by ...

    African Journals Online (AJOL)

    Corrosion of Zinc metal in (HNO3 + HCl) binary acid mixture and inhibition efficiency of aniline has been studied by weight loss method and polarization technique. Corrosion rate increases with the concentration of acid mixture and the temperature. Inhibition efficiency (I.E.) of aniline increases with the concentration of ...

  9. Untitled

    African Journals Online (AJOL)

    degradation of polyanine at positive potentials (ca 0.70 V) vs SCE in the absence of aniline monomer is totally suppressed when the electrochemical process is carried in sodium chloride solution and acetic acid-sodium acetate mixture. INTRODUCTION. Research on conducting polymers i.e., poly-(aniline, pyrrole, ...

  10. On salting in effect of the second group metal rhodanides on aqueous-amine solutions

    International Nuclear Information System (INIS)

    Krupatkin, I.L.; Ostrovskaya, E.M.; Vorob'eva, L.D.; Kamyshnikova, G.V.

    1978-01-01

    The ''salting in'' effect of rhodanides of Group 2 metals (magnesium, calcium, strontium, barium) on aqueous-amine solutions (water-aniline, and water-o-toluidine systems) is studied. The solubility in these systems has been determined by the isothermal method at 25 deg C. Compositions of the co-existing liquid phases have been determined by refractometry. The phase diagrams of water-aniline-rhodanide of magnesium, calcium and strontium systems have the same qualitative view. These rhodanides ''salt in'' the water-aniline system so strongly that the systems are completely homogenized. According to the decreasing homogenization effect on the water-aniline and water-o-toluidine systems the salts may be arranged into the following series Mg(NCS) 2 >Ca(NCS) 2 >Sr(NCS) 2 >Ba(NCS) 2 . The ''salting in'. effect is weaker in the water-o-toluidine system rather than in the water-aniline one

  11. Self-Driven Bioelectrochemical Mineralization of Azobenzene by Coupling Cathodic Reduction with Anodic Intermediate Oxidation

    International Nuclear Information System (INIS)

    Liu, Rong-Hua; Li, Wen-Wei; Sheng, Guo-Ping; Tong, Zhong-Hua; Lam, Michael Hon-Wah; Yu, Han-Qing

    2015-01-01

    Highlights: • Azobenzene was reduced to aniline at the cathode of an acetate-fueled MFC. • Aniline was degraded at the bioanode of a single-chamber MFC. • Cathodic reduction of azobenzene was coupled with anodic oxidation of aniline. • Self-driven, complete mineralization of azobenzene in an MFC was accomplished. - Abstract: Bioelectrochemical systems have been intensively studied as a promising technology for wastewater treatment and environment remediation. Coupling of the anodic and cathodic electrochemical reactions allows an enhanced degradation of recalcitrant organics, but external power supply is usually needed to overcome the thermodynamic barrier. In this work, we report a self-driven degradation of azobenzene in a microbial fuel cell (MFC), where the cathodic reduction of azobenzene was effectively coupled with the anodic oxidation of its reduction degradation intermediate (i.e., aniline). The anodic degradation rate of aniline, as the sole carbon source, was significantly higher than that under open-circuit conditions, suggesting a considerable bioelectrochemical oxidation of aniline. Output voltages up to 8 mV were obtained in the MFC. However, a shift of cathodic electron acceptor from oxygen to azobenzene resulted in a decreased aniline degradation rate and output voltage. The present work may provide valuable implications for development of sustainable bioelectrochemical technologies for environmental remediation

  12. Synthesis of 14C-labelled polychlorobiphenyls derived from the labelled 4-chloro-, 2,5-dichloro-, 3,4-dichloro-, 2,3-dichloro-2,4,5-trichloro- and 2,3,6-trichloroanilines

    International Nuclear Information System (INIS)

    Bergman, A.; Bamford, I.; Wachtmeister, C.A.

    1981-01-01

    [ 14 C]Aniline hydrogen sulphate was acetylated, and the acetanilide obtained was chlorinated with N-chlorosuccinimide to 2-chloro, 4-chloro- and 2,4-dichloroacet[ 14 C]anilide. The labelled 2- and 4-chloroacet[ 14 C]anilides were hydrolyzed and treated with aluminium chloride, hydrogen chloride and chlorine in dry dichloromethane to give the major products 2,5-dichloro-and 3,4-dichloro[ 14 C]aniline. The labelled 2,3-dichloro- and 2,3,6-trichloroanilines were obtained as minor products from the chlorination of 2-chloro[ 14 C]aniline, likewise 2,4,5-trichloroaniline was obtained from 4-chloro[ 14 C]aniline. The [ 14 C]anilines prepared were coupled with benzene, 1,4-dichloro-, 1,2-dichloro- or 1,3-dichlorobenzene to give 4-chloro-, 2,3',4',5-tetrachloro-, 2,3,3',4'-tetrachloro-, 3,3',4,4'-tetrachloro-, 2,2',5,5'-tetrachloro-, 2,2',3,3'-tetrachloro-, 2,2',3,5',6-pentachloro-, 2,2',4,4',5-pentachloro- and 2,3',4,5,5'-pentachloro[ 14 C]biphenyl. 3,4-Dichloro[ 14 C]aniline and biphenyls prepared from this aniline were found to be contaminated by bromoanalogues. The origin of these have been studied. (author)

  13. Applications of deuterium labeling in studies of drug metabolism: metabolism of trideuteroaniline mustard

    International Nuclear Information System (INIS)

    Cox, P.J.; Farmer, P.B.; Foster, A.B.; Jarman, M.

    1977-01-01

    In a continuation of a study of aniline mustard, the metabolism of 2,4,6-trideuteroaniline mustard [N-N-di-(2-chloroethyl)-2,4,6-trideuteroaniline] was investigated. Measurements of the ratios of deuterated to nondeuterated species in p-hydroxyaniline mustard and N-(2-chloroethyl)-4-hydroxyaniline isolated following in vitro metabolism of a mixture of aniline mustard and aniline mustard-d 3 enabled a determination both of the kinetic isotope effect and of the extents of NIH shifts and indicated the probable metabolite sequence

  14. Electrochemical supercapacitor application of electroless surface polymerization of polyaniline nanostructures

    International Nuclear Information System (INIS)

    Amarnath, Chellachamy A.; Chang, Jin Ho; Kim, Doyoung; Mane, Rajaram S.; Han, Sung-Hwan; Sohn, Daewon

    2009-01-01

    Electrochemical supercapacitive behaviour of polyaniline nanostructures, i.e., nanorods and nanospheres fabricated on aniline-primed conducting indium-tin oxide substrate via electroless surface polymerization using ammonium persulfate as initiator and selenious acid as efficient dopant is investigated. The self-assembled monolayer of urea derivative in presence of 3-(triethoxysilyl)-propyl isocyanate and aniline plays role of aniline-primed substrate. Polyaniline electrode composed of nanorods of excess surface area responsible for large redox reactions has shown 592 F g -1 specific capacitance which is significantly greater than closely compact polyaniline nanospheres, i.e., 214 F g -1

  15. Application of Functionalized SWCNTs for Increase of Degradation Resistance of Acrylic Paint for Cars

    Directory of Open Access Journals (Sweden)

    Osiel Lucas Flores

    2013-01-01

    Full Text Available Physical properties of automotive acrylic paint are improved by incorporation of three different types of carbon nanotubes: single-wall carbon nanotubes (SWCNTs, OH-functionalized single-wall carbon nanotubes (OH-SWCNTs, and aniline-functionalized single-wall carbon nanotubes (aniline-SWCNTs. The formed composites are studied by electron miscroscopy methods and Raman spectrometry. It is found that the acrylic paints with addition of OH-SWCNTs and aniline-SWCNTs show better quality for their applications. In particular, the resistance against degradation by electron beam increased in ~500%.

  16. Theoretical study on perylene derivatives as fluorescent sensors for amines

    Science.gov (United States)

    Lathiotakis, Nektarios N.; Kerkines, Ioannis S. K.; Theodorakopoulos, Giannoula; Petsalakis, Ioannis D.

    2018-01-01

    A theoretical study is presented on perylene diimide (PDI) and perylene monoimide (PMI) and their action as sensors of amines in solution. Density functional theory (DFT) and Time dependent DFT (TDDFT) calculations are carried out on complexes of PDI and PMI with aniline in THF solution. The optimized geometries for the complexes have aniline lying parallel above the perylene at 3.15 Å and with binding energy of 0.53 eV in the ground state. The results on the excited states are consistent with a photoinduced electron transfer (PET) mechanism. The effective aniline-perylene distance resulting from a Mulliken's approach is 3.61 Å.

  17. Journal of Chemical Sciences | Indian Academy of Sciences

    Indian Academy of Sciences (India)

    ... of catechols in the presence of cycloheptylamine and aniline: Experiments and digital ... Oxidative coupling reaction of some catechols has been studied by cyclic ... observed homogenous rate constants of the coupling reaction of catechols ...

  18. Efficient example of cross-linked polymeric catalysed synthesis of ...

    Indian Academy of Sciences (India)

    substituted anilines in water under microwave irradia- tion conditions.8. ∗ ... and for applications for industrial processes, recycla- bility, greater selectivity ... crude product was purified by column chromatography on silica gel eluting by ...

  19. SHORT COMMUNICATION INTERMEDIATE OBTAINED FROM ...

    African Journals Online (AJOL)

    Preferred Customer

    Printed in Ethiopia. © 2014 Chemical Society of Ethiopia ... 2Departments of Chemistry, Osmania University, Hyderabad-500007, India. 3Departments of Chemistry ... is composed primarily of water-aniline hydrogen bond [9]. Literature survey ...

  20. Chimeric polymers formed from a monomer capable of free radical, oxidative and electrochemical polymerisation.

    Science.gov (United States)

    Lakshmi, Dhana; Whitcombe, Michael J; Davis, Frank; Chianella, Iva; Piletska, Elena V; Guerreiro, Antonio; Subrahmanyam, Sreenath; Brito, Paula S; Fowler, Steven A; Piletsky, Sergey A

    2009-05-21

    A new monomer, which incorporates both aniline and methacrylamide functional groups, was shown to possess orthogonal polymerisation behaviour to produce conjugated polyaniline suitable for a wide range of applications.

  1. 21 CFR 74.1339 - D&C Red No. 39.

    Science.gov (United States)

    2010-04-01

    .... Anthranilic acid, not more than 0.2 percent. N,N-(β,β′-Dihydroxy-diethyl) aniline, not more than 0.2 percent... germicidal solutions intended for external application only, and subject to the further restriction that the...

  2. 40 CFR 445.2 - General definitions.

    Science.gov (United States)

    2010-07-01

    ... wastes are placed for permanent disposal, that is not a land application or land treatment unit, surface... CFR part 136 are as follows: (1) Aniline. (2) Benzoic acid. (3) p-Cresol. (4) Pyridine. (5) a...

  3. SUBJECT INDEX

    Indian Academy of Sciences (India)

    Unknown

    Electrochemical behaviour of alkaline copper complexes. 543 ... Kinetic investigation of the oxidation of N- alkyl anilines by ... Catalytic combustion of methane. A method for increasing ... Cobalt(III), nickel(II) and ruthenium(II) complexes of 1 ...

  4. Ecological anatomy of some hydrophytes in Nigeria

    African Journals Online (AJOL)

    STORAGESEVER

    2009-07-20

    Jul 20, 2009 ... tissues and counter stained in Aniline Blue to increase contrast. Sections were viewed with microscope equipped with the ocular eye-piece at 100 x magnification. .... the relationship between anatomy, ecology and evolution.

  5. Catalysis by Design Using Surface Organometallic Nitrogen-Containing Fragments

    KAUST Repository

    Hamzaoui, Bilel

    2016-01-01

    leading to opening strained siloxane bridges into acid-base paired functionalities (formation of N-phenylsilanamine-silanol pairs). This approach was successfully applied to the design of a series of aniline derivatives bifunctional SBA15. The efficiency

  6. Effect of reaction conditions on film morphology of polyaniline composite membranes for gas separation

    KAUST Repository

    Blinova, Natalia V.; Stejskal, Jaroslav; Frechet, Jean; Švec, František

    2012-01-01

    precipitation, dispersion, or emulsion polymerization of aniline with simultaneous deposition on top of the porous polypropylene support, which was immersed in the reaction mixture. Variables such as temperature, concentration of reagents, presence of steric

  7. Catalytic Asymmetric Piancatelli Rearrangement: Brønsted Acid Catalyzed 4π Electrocyclization for the Synthesis of Multisubstituted Cyclopentenones

    KAUST Repository

    Cai, Yunfei; Tang, Yurong; Atodiresei, Iuliana; Rueping, Magnus

    2016-01-01

    The first catalytic asymmetric Piancatelli reaction is reported. Catalyzed by a chiral Brønsted acid, the rearrangement of a wide range of furylcarbinols with a series of aniline derivatives provides valuable aminocyclopentenones in high yields

  8. Degradation of Biofumigant Isothiocyanates and Allyl Glucosinolate in Soil and Their Effects on the Microbial Community Composition.

    Directory of Open Access Journals (Sweden)

    Franziska S Hanschen

    Full Text Available Brassicales species rich in glucosinolates are used for biofumigation, a process based on releasing enzymatically toxic isothiocyanates into the soil. These hydrolysis products are volatile and often reactive compounds. Moreover, glucosinolates can be degraded also without the presence of the hydrolytic enzyme myrosinase which might contribute to bioactive effects. Thus, in the present study the stability of Brassicaceae plant-derived and pure glucosinolates hydrolysis products was studied using three different soils (model biofumigation. In addition, the degradation of pure 2-propenyl glucosinolate was investigated with special regard to the formation of volatile breakdown products. Finally, the influence of pure glucosinolate degradation on the bacterial community composition was evaluated using denaturing gradient gel electrophoresis of 16S rRNA gene amplified from total community DNA. The model biofumigation study revealed that the structure of the hydrolysis products had a significant impact on their stability in the soil but not the soil type. Following the degradation of pure 2-propenyl glucosinolate in the soils, the nitrile as well as the isothiocyanate can be the main degradation products, depending on the soil type. Furthermore, the degradation was shown to be both chemically as well as biologically mediated as autoclaving reduced degradation. The nitrile was the major product of the chemical degradation and its formation increased with iron content of the soil. Additionally, the bacterial community composition was significantly affected by adding pure 2-propenyl glucosinolate, the effect being more pronounced than in treatments with myrosinase added to the glucosinolate. Therefore, glucosinolates can have a greater effect on soil bacterial community composition than their hydrolysis products.

  9. Metabolism of metofluthrin in rats: I. Identification of metabolites.

    Science.gov (United States)

    Abe, Jun; Nagahori, Hirohisa; Tarui, Hirokazu; Tomigahara, Yoshitaka; Isobe, Naohiko

    2018-02-01

    1. Metofluthrin (2,3,5,6-tetrafluoro-4-(methoxymethyl)benzyl (Z/E)-(1R)-trans-2,2-dimethyl-3-(1-propenyl)-cyclopropanecarboxylate) is a novel pyrethroid insecticide, which has E/Z isomers at prop-1-enyl group. 2. Rats were orally dosed with each [ 14 C]-labelled E/Z isomer, and the excreta were collected for isolation and identification of metabolites. Analysis of the excreta by LC/MS and NMR revealed formation of 33 and 23 (total 42) metabolites from rats dosed with Z-isomer and E-isomer, respectively. 3. Major metabolic reactions were cleavage of ester linkage, O-demethylation, hydroxylation, epoxidation or reduction of double bond, glutathione conjugation and its further metabolism, hydroxylation of epoxide and formation of lactone ring. Notably, the acid side, 2,2-dimethyl-3-(1-propenyl)-cyclopropanecarboxylic acid, was much more variously metabolised compared to chrysanthemic acid, the acid side of the known pyrethroids. 4. Major metabolites for Z-isomer mostly retained ester linkage with 1,2-dihydroxypropyl group and/or 2-methylalcohol of cyclopropane ring, while most of those for E-isomer received hydrolysis of the ester linkage without oxidation at the 1-propenyl group or the gem-methyl groups, suggesting epoxidation and hydroxylation could occur more easily on Z-isomer. 5. As the novel metabolic pathways for pyrethroids, isomerisation of ω-carboxylic acid moiety, reduction or hydration of double bond and cleavage of cyclopropane ring via epoxidation were suggested.

  10. A Highly Efficient Catalyst for Oxime Ligation and Hydrazone-Oxime Exchange Suitable for Bioconjugation

    OpenAIRE

    Rashidian, Mohammad; Mahmoodi, Mohammad M.; Shah, Rachit; Dozier, Jonathan K.; Wagner, Carston R.; Distefano, Mark D.

    2013-01-01

    Imine-based reactions are useful for a wide range of bioconjugation applications. Although aniline is known to catalyze the oxime ligation reaction under physiological conditions, it suffers from slow reaction kinetics, specifically when a ketone is being used or when hydrazone-oxime exchange is performed. Here, we report on the discovery of a new catalyst that is up to 15 times more efficient than aniline. That catalyst, m-phenylenediamine (mPDA), was initially used to analyze the kinetics o...

  11. Biotransformations with plant tissue cultures.

    Science.gov (United States)

    Carew, D P; Bainbridge, T

    1976-01-01

    Suspension cultures of Catharanthus roseus, Apocynum cannabinum and Conium maculatum were examined for their capacity to transform aniline, anisole, acetanilide, benzoic acid and coumarin. None of the cultures transformed acetanilide but each produced acetanilide when fed aniline. All three cultures converted benzoic acid to its para-hydroxy derivative. Coumarin was selectively hydroxylated at the 7-position by Catharanthus and Conium and anisole was O-demethylated only by older Catharanthus tissue.

  12. INHIBITION OF CORROSION OF ZINC IN (HNO3 + HCl) ACID ...

    African Journals Online (AJOL)

    2015-05-01

    May 1, 2015 ... corrosion inhibitor for zinc in phosphoric acid. Vashi et al.[8-9] studied the corrosion inhibition of zinc in (HNO3 + H2SO4) and (HNO3 + H3PO4) binary acid mixture by aniline. In the present work, the role of aniline as inhibitor for corrosion of zinc in (HNO3 + HCl) binary acid mixture has been reported. 2.

  13. Transformation of oligoaniline microspheres to platelike nitrogen-containing carbon

    Czech Academy of Sciences Publication Activity Database

    Morávková, Zuzana; Trchová, Miroslava; Tomšík, Elena; Zhigunov, Alexander; Stejskal, Jaroslav

    2013-01-01

    Roč. 117, č. 5 (2013), s. 2289-2299 ISSN 1932-7447 R&D Projects: GA ČR GAP205/12/0911; GA ČR GPP108/11/P763 Institutional research plan: CEZ:AV0Z40500505 Institutional support: RVO:61389013 Keywords : aniline * aniline oligomers * polyaniline Subject RIV: CD - Macromolecular Chemistry Impact factor: 4.835, year: 2013

  14. Di-tert-butyl N-[2,6-bis(methoxymethoxyphenyl]iminodiacetate

    Directory of Open Access Journals (Sweden)

    Ben Capuano

    2009-04-01

    Full Text Available The title molecule, C20H31NO8, has pseudo-C2 symmetry about the C—N bond, with the bis(tert-butoxycarbonylamino group twisted from the benzene ring plane by ca 60° and the bulky tert-butoxycarbonyl (Boc groups are orientated away from the substituted aniline group. As part of an antibacterial drug discovery programme furnishing analogues of platensimycin, we unexpectedly synthesized the bis-Boc-protected aniline.

  15. Supramolecular architectures constructed through self-assembly of a chalcone and substituted diazo-β-diketones

    Science.gov (United States)

    Prajapati, R.; Mishra, L.; Grabowski, S. J.; Govil, G.; Dubey, S. K.

    2008-05-01

    Organic compounds namely pyridyl chalcone viz. 3-[4-(3-oxo-3-pyridin-2-yl-propenyl)-phenyl]-1-pyridin-2-yl-propenone (L 1), p-cholorophenyldiazopentane-2,4-dione (L 2) and p-methyl phenyldiazopentane-2,4-dione (L 3) have been characterized by their single-crystal X-ray crystallographic studies. Several structural motifs resulting upon their self-association through probable non-covalent interactions have been discussed. The studies of related motifs found in Cambridge Structural Database are performed and the results are related to the structural data obtained for crystal structures reported here in.

  16. New neolignans from Krameria tomentosa A. St.-Hil

    International Nuclear Information System (INIS)

    Madeiro, Sara A.L.; Lucena, Hellane F.S. de; Siqueira, Caroline D.; Duarte, Marcelo C.; Barbosa Filho, Jose M.; Silva, Marcelo S. da; Tavares, Josean F.; Braz-Filho, Raimundo

    2012-01-01

    A phytochemical investigation of the roots of Krameria tomentosa A. St.-Hil. led to the isolation of five neolignans, two of them with novel structures [1,1'-(E)-propenyl-4-methoxy- 3,4'-oxyneolignan (ottomentosa) and 2-(2'-hydroxy-4',6'-dimethoxyphenyl)benzofuran- 5-carboxylic acid (sobraline)] and three known compounds [eupomatenoid 6, dihydrocarinatidin and 2-(2',4'-dihydroxyphenyl)-5-(E)-propenylbenzofuran]. The structural characterization of the compounds isolated was established based on infrared spectroscopy, mass spectrometry, one- and two-dimensional nuclear magnetic resonance, along with comparison with spectral data described in the literature. (author)

  17. [Studies on metabolites from marine microorganism Aspergillus terreus collected from nature reserve region of mangrove].

    Science.gov (United States)

    Shen, Yi; Zou, Jianhua; Dai, Jungui

    2011-09-01

    To search for new antitumor active lead compounds from marine microorganism. A marine strain, Aspergillus terreus, was cultured and up-scaled in artificial seawater media, from which the metabolites were isolated and elucidated by using modern spectroscopy techniques. Twelve compounds were isolated from mycelia and fermentation broth of A. terreus. Compounds 1-4 were steroids, compounds 5-8 were organic acids and esters, compound 9 was an alkaloid, compound 10 was an isocoumarin, compound 11 was ceramide, compound 12 was propenyl cyclic pentanediol.

  18. Study of the processes of ion pairs formation by the method of ion-ion coincidence: I2 and chlorine-containing hydrocarbons

    International Nuclear Information System (INIS)

    Golovin, A.V.

    1991-01-01

    A method of ion-ion coincidences was suggested to study the process of ion pairs formation during molecule photoionization. The principle of action of ion-ion coincidence method is based on recording of only the negative and positive ions that formed as a result of a molecule decomposition. The flowsheet of the facility of ion-ion coincidences was presented. The processes of ion pairs formation in iodine, chloroform, propyl-, n-propenyl-, tert.butyl- and benzyl-chlorides were studied. A simple model permitting to evaluate the dependence of quantum yield of ion pair formation on excitation energy was suggested

  19. Synthesis of carbon-13 labeled ibuprofen

    International Nuclear Information System (INIS)

    Hsi, R.S.P.; Stelzer, L.S.; Stolle, W.T.

    1989-01-01

    This report describes the synthesis of 2-[4-(2-methyl)propyl-phenyl]propionic acid (ibuprofen) labeled with carbon-13 either at the terminal methyl carbons, or at the methine carbon of the isobutyl side chain. The synthetic route involves the removal of the isopropyl group in the isobutyl side-chain of ibuprofen via 2-[4-(2-methyl-1-propenyl)phenyl]propionic acid, followed by restoration of the isopropyl group with a Wittig reaction, using appropriate carbon-13 labeled acetone as the precursor of the isopropyl group. Interesting NMR coupling data attributable to phosphorous and carbon-13 are presented in the experimental section. (author)

  20. Study of the voltammetric behaviour of the ethalfluralin and methalpropalin and its determination in environmental matrices at hanging mercury drop electrode.

    Science.gov (United States)

    Thriveni, T; Kumar, J Rajesh; Lee, Jin Young; Sreedhar, N Y

    2009-04-01

    An electroanalytical method has been developed for the determination of the herbicides ethalfluralin[N-ethyl-N-(2-methyl-2-propenyl)-2,6-dinitro-4-(trifluoromethyl) bezenamine] and methalpropalin [N-(2-methyl-2-propenyl)-2, 6-dinitro-N-propyl-4 (trifluoromethyl) benzenamine] by differential pulse adsorptive stripping voltammetry (DP-AdSV) on a hanging mercury drop electrode (HMDE) with universal buffer as supporting electrolyte. The optimum adsorption conditions were found to be pH 6.0, an accumulation potential of -0.6 V (HMDE vs SCE), an accumulation time of 80 s. and scan rate 45 mVs(-1). Calibration curve is linear in the range 1.30 x 10(-9) to 1.32 x 10(-5) M of ethalfluralin and 1.13 x 10(-5) to 2.0 x 10(-8) M of methalpropalin with detection limits of 1.08 x 10(-9) and 1.87 x 10(-8) M, respectively. The relative SD and correlation coefficients were found to be 1.24%, 0.998 and 1.34%, 0.995, respectively for ten replicates. The method is applied to the determination of the ethalfluralin and methalpropalin in formulations and environmental matrices.

  1. Genes encoding chavicol/eugenol synthase from the creosote bush Larrea tridentata

    Science.gov (United States)

    Lewis, Norman G.; Davin, Laurence B.; Kim, Sung -Jin; Vassao, Daniel Giddings; Patten, Ann M.; Eichinger, Dietmar

    2015-09-15

    Particular aspects provide novel methods for redirecting carbon allocation in plants or cell culture from lignification to inherently more useful and tractable materials, and to facilitate the generation of, e.g., biofuels from the remaining plant ro culture biomass. Particular aspects provided novel methods for converting monolignols into allyl/propenyl phenols, and for chavicol/eugenol formation or production. Additional aspects relate to the discovery of novel chavicol/eugenol synthases that convert p-coumaryl/coniferyl alcohol esters into chavicol/eugenol, and to novel compositions (e.g., novel proteins and nucleic acids encoding same), and novel methods using same for producing or forming chavicol/eugenol and other derivatives in cell culture and/or genetically modified plants, and for re-engineering the composition of plant biomass. Particular aspects provide novel methods for generation in culture or in planta of liquid/combustible allyl/propenyl phenols, and these phenolic products are utilized for (non-ethanol) biofuel/bioenergy purposes, while the remaining plant biomass facilitates the generation of other biofuels.

  2. The photochemistry of ring-substituted cinnamyl acetates

    International Nuclear Information System (INIS)

    Fleming, S.A.; Renault, L.; Grundy, E.C.; Pincock, J.A.

    2006-01-01

    The photochemistry of the (E)-cinnamyl acetates ((E)-1-aryl-3-propenyl acetates, 8a-8e) with substituents H, 4-CH 3 O, 3-CH 3 O, 4-CF 3 , and 3-CF 3 , respectively, was examined in both cyclohexane and methanol solvents. Alkene isomerization (E to Z) occurred more efficiently than other reactions and evidence is presented that this process occurs from the excited triplet state. In a slower process, 1,3-migration of the acetoxy group led to the rearranged 3-aryl-3-propenyl acetate isomers (9a-9e) as the major pathway, particularly in cylohexane. In methanol, the isomeric ethers 3-aryl-3-methoxypropene (14) and 1-aryl-3-methoxypropene (15) were formed by reaction of methanol with the photochemically generated cation. The combined yield of 14 and 15 (95% and 5%, respectively) was quantitative for the 4-methoxyphenyl compound (8b). Independent irradiations of the isomers 9a-9c demonstrated that the ethers 14 and 15 were primary photoproducts from 8 and not secondary photoproducts from 9. Fluorescence quantum yields and excited singlet state lifetimes indicated that the reactions, other than the E to Z isomerization, are from the excited singlet state. (author)

  3. Inhibition of platelet activation by lachrymatory factor synthase (LFS)-silenced (tearless) onion juice.

    Science.gov (United States)

    Thomson, Susan J; Rippon, Paula; Butts, Chrissie; Olsen, Sarah; Shaw, Martin; Joyce, Nigel I; Eady, Colin C

    2013-11-06

    Onion and garlic are renowned for their roles as functional foods. The health benefits of garlic are attributed to di-2-propenyl thiosulfinate (allicin), a sulfur compound found in disrupted garlic but not found in disrupted onion. Recently, onions have been grown with repressed lachrymatory factor synthase (LFS) activity, which causes these onions to produce increased amounts of di-1-propenyl thiosulfinate, an isomer of allicin. This investigation into the key health attributes of LFS-silenced (tearless) onions demonstrates that they have some attributes more similar to garlic and that this is likely due to the production of novel thiosulfinate or metabolites. The key finding was that collagen-induced in vitro platelet aggregation was significantly reduced by tearless onion extract over normal onion extract. Thiosulfinate or derived compounds were shown not to be responsible for the observed changes in the inflammatory response of AGS (stomach adenocarcinoma) cells to tumor necrosis factor alpha (TNFα) when pretreated with model onion juices. A preliminary rat feeding trial indicated that the tearless onions may also play a key role in reducing weight gain.

  4. Assessment of chemical composition of essential oil of Ferula assa-foetida oleo-gum-resin from two different sites of Yazd province in center of Iran

    Directory of Open Access Journals (Sweden)

    H. Hadavand Mirzaei

    2014-04-01

    Full Text Available In this experiment, the chemical composition of the essential oils obtained from Ferula assa-foetida oleo-gum resin collected from two different sites of Yazd province (Tabas and Yazd in the center of Iran, were identified. The gas chromatography mass-spectroscopy (GC/MS data showed that the qualitative composition of the components appeared to be constant in two different regions. Moreover, no remarkable variations were found in the amounts of the essential oil major constituents. A total thirty-nine components, comprising 91.52% and 95.61% of the total oil, were characterized in Tabas and Yazd samples, respectively. The hydrodistilled oils contained E-1-propenyl sec-butyl disulfide (40.15 and 44.36% in Tabas and Yazd samples, respectively, Z-1-propenyl sec-butyl disulfide (23.93 and 27.98%, Guaiol (5.50 and 3.14% and Carotol (5.14 and 1.63% as major constituents.

  5. RESIDU BAHAN AKTIF ASAP OBAT NYAMUK BAKAR YANG TERBUAT DARI DAUN LEGUNDI (Vitex trifolia L. PADA ORGAN PARU-PARU MENCIT

    Directory of Open Access Journals (Sweden)

    Sri Wahjuni

    2014-04-01

    Mosquito coil made from the leaves legundi (Vitex trifolia L. was burned and the smoke is exposed to male mice (Mus muculus for 20 days (acute exposure. Mice that had been exposed to mosquito coil smoke legundi (Vitex trifolia L. anesthetized with cotton that has been moistened with chlorofom solution, then mice were dissected and their abdominal organs was taken transversely to the lungs. Lungs of mice was macerated with ethanol 96% for 1x24 hours. Then extracted lungs of mice were analyzed by GC-MS. A number of 15 compounds from legundi (Vitex trifolia L. mosquito coil smoke were identified using GC-MS, including: methenamine; 2-methoxy-4-vinylphenol; 2, 6-dimethoxyphenol; 4-hydroxy-3- methoxy-benzoic acid; 2-methoxy-4-(1-propenyl phenol-E; 5-tert-butylpyrogallol, 1, 3, 7, 7-tetra methylbicycloheptan-2-one, 2, 3, 5, 6-tetrafluoroanisol; diethyl pthalate, 2, 6 - dimethoxy-4-(2-propenyl phenol; N-N-dimethyl methanesulfonamide; 4-hydroxy-3-nitrocoumarin; citenamide; 1- methyl-anthraquinone; and hexamethyilcyclotrisiloxane. Lungs of mice analyzed using GC-MS found a compound of hexamethyilcyclotrisiloxane which was similar to compound observed in legundi (Vitex trifolia L. mosquito coil smoke.

  6. UV-tunable laser induced phototransformations of matrix isolated anethole.

    Science.gov (United States)

    Krupa, Justyna; Wierzejewska, Maria; Nunes, Cláudio M; Fausto, Rui

    2014-03-14

    A matrix isolation study of the infrared spectra and structure of anethole (1-methoxy-4-(1-propenyl)benzene) has been carried out, showing the presence of two E conformers (AE1, AE2) of the molecule in the as-deposited matrices. Irradiation using ultraviolet-tunable laser light at 308-307 nm induced conformationally selective phototransformations of these forms into two less stable Z conformers (AZ1, AZ2). The back reactions were also detected upon irradiation at 301 nm. On the whole, the obtained results allow for full assignment of the infrared spectra of all the four experimentally observed anethole isomers and showed that the narrowband UV-induced E-Z photoisomerization is an efficient and selective way to interconvert the two isomers of anethole into each other, with conformational discrimination. Photolysis of anethole was observed as well, with initial methoxyl O-C bond cleavage and formation of CH3 and p-propenylphenoxy (AR) radicals, followed by radical recombination to form 2-methyl-4-propenyl-2,4-cyclohexadienone, which subsequently undergoes ring-opening generating several conformers of long-chain conjugated ketenes. Interpretation of the experimental observations was supported by density functional theory (B3LYP and B2PLYD) calculations.

  7. In situ one-pot preparation of reduced graphene oxide/polyaniline composite for high-performance electrochemical capacitors

    International Nuclear Information System (INIS)

    Chen, Nali; Ren, Yapeng; Kong, Peipei; Tan, Lin; Feng, Huixia; Luo, Yongchun

    2017-01-01

    Highlights: • A new method to prepare reduced graphene oxide/polyaniline composite is developed. • Aniline serves as a reduction for graphene oxide under weak alkali condition. • Different characterizations confirm that GO can be effectively reduced by aniline. • A high specific capacitance of 524.4 F·g"−"1 is obtained at 0.5 A·g"−"1. - Abstract: Reduced graphene oxide/polyaniline (rGO/PANI) composites are prepared through an effective in situ one-pot synthesis route that includes the reduction of graphene oxide (GO) by aniline under weak alkali condition via hydrothermal method and then followed by in situ polymerization of aniline. X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, ultraviolet-visible spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscope and transmission electron microscope are employed to reveal that GO is successfully reduced by aniline under weak alkali condition and PANI can be deposited on the surfaces of reduced graphene oxide (rGO) sheets. The effect of rGO is optimized by tuning the mass ratios of aniline to GO to improve the electrochemical performance of rGO/PANI composites. The maximum specific capacitance of rGO/PANI composites achieves 524.4 F/g with a mass ratio of aniline to GO 10:1 at a current density of 0.5 A/g, in comparison to the specific capacitance of 397 F/g at the same current density of pure PANI. Particularly, the specific capacity retention rate is 81.1% after 2000 cycles at 100 mv/s scan rate, which is an improvement over that of pure PANI (55.5%).

  8. Mineralization of soil-aged isoproturon and isoproturon metabolites by Sphingomonas sp. strain SRS2.

    Science.gov (United States)

    Johannesen, Helle; Sørensen, Sebastian R; Aamand, Jens

    2003-01-01

    The aim of the study was to determine the effect of aging of the herbicide isoproturon and its metabolites monodesmethyl-isoproturon and 4-isopropyl-aniline in agricultural soil on their availability to the degrading bacterium Sphingomonas sp. strain SRS2. The 14C-ring-labeled isoproturon, monodesmethyl-isoproturon, and 4-isopropyl-aniline were added to sterilized soil and stored for 1, 49, 71, or 131 d before inoculation with strain SRS2. The availability of the compounds was estimated from the initial mineralization and the amount of 14CO2 recovered after 120 d of incubation. Aging in soil for 131 d reduced the initial mineralization of isoproturon and monodesmethyl-isoproturon and, in the case of isoproturon, also reduced the recovery of 14CO2. Initial mineralization and recovery of 14CO2 from aged 4-isopropyl-aniline were slightly reduced, but less 14CO2 was generally produced than with isoproturon or monodesmethyl-isoproturon. Thus, recovery of 14CO2 from 14C-isoproturon and 14C-monodesmethyl-isoproturon was 50.7 to 64.4% of the initially added 14C, while recovery from 14C-4-isopropyl-aniline was only 11.7 to 17.0%. Sorption measurements revealed similar Freundlich constants (K(f)) for isoproturon and monodesmethyl-isoproturon, whereas K(f) for 4-isopropyl-aniline was more than fivefold greater. The findings imply that in soil, partial degradation of isoproturon to 4-isopropyl-aniline may lead to reduced mineralization of the herbicide due to sorption of the aniline moiety.

  9. In situ one-pot preparation of reduced graphene oxide/polyaniline composite for high-performance electrochemical capacitors

    Energy Technology Data Exchange (ETDEWEB)

    Chen, Nali [College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, Gansu (China); State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, Gansu (China); Ren, Yapeng; Kong, Peipei; Tan, Lin [College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, Gansu (China); Feng, Huixia, E-mail: fenghx@lut.cn [College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, Gansu (China); Luo, Yongchun, E-mail: luoyc@lut.cn [State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, Gansu (China)

    2017-01-15

    Highlights: • A new method to prepare reduced graphene oxide/polyaniline composite is developed. • Aniline serves as a reduction for graphene oxide under weak alkali condition. • Different characterizations confirm that GO can be effectively reduced by aniline. • A high specific capacitance of 524.4 F·g{sup −1} is obtained at 0.5 A·g{sup −1}. - Abstract: Reduced graphene oxide/polyaniline (rGO/PANI) composites are prepared through an effective in situ one-pot synthesis route that includes the reduction of graphene oxide (GO) by aniline under weak alkali condition via hydrothermal method and then followed by in situ polymerization of aniline. X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, ultraviolet-visible spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscope and transmission electron microscope are employed to reveal that GO is successfully reduced by aniline under weak alkali condition and PANI can be deposited on the surfaces of reduced graphene oxide (rGO) sheets. The effect of rGO is optimized by tuning the mass ratios of aniline to GO to improve the electrochemical performance of rGO/PANI composites. The maximum specific capacitance of rGO/PANI composites achieves 524.4 F/g with a mass ratio of aniline to GO 10:1 at a current density of 0.5 A/g, in comparison to the specific capacitance of 397 F/g at the same current density of pure PANI. Particularly, the specific capacity retention rate is 81.1% after 2000 cycles at 100 mv/s scan rate, which is an improvement over that of pure PANI (55.5%).

  10. In Situ Infrared Spectroscopy of Oligoaniline Intermediates Created under Alkaline Conditions.

    Science.gov (United States)

    Šeděnková, Ivana; Stejskal, Jaroslav; Trchová, Miroslava

    2014-12-26

    The progress of the oxidation of aniline with ammonium peroxydisulfate in an alkaline aqueous medium has been monitored in situ by attenuated total reflection (ATR) Fourier transform infrared spectroscopy. The growth of the microspheres and of the film at the ATR crystal surface, as well as the changes proceeding in the surrounding aqueous medium, are reflected in the spectra. The evolution of the spectra and the changes in the molecular structure occurring during aniline oxidation in alkaline medium are discussed with the help of differential spectra. Several processes connected with the various stages of aniline oxidation were distinguished. The progress of hydrolysis of the aniline in water and further an oxidation of aminophenol to benzoquinone imines in the presence of peroxydisulfate in alkaline medium have been detected in the spectra in real time. The precipitated solid oxidation product was analyzed by mass spectrometry. It is composed of oligomers, mainly trimers to octamers, of various molecular structures incorporating in addition to aniline constitutional units also p-benzoquinone or p-benzoquinoneimine moieties.

  11. Synthesis of [3-14C]- and [phenyl-U-14C] olaquindox

    International Nuclear Information System (INIS)

    Maul, W.; Scherling, D.; Seng, F.

    1981-01-01

    Olaquindox is a new feed additive. [ 14 C]Olaquindox, labelled in different positions, was needed for tracer-studies of pharmacokinetics, biotransformation and residues in several species of animals. 2-[N-(2-hydroxethyl)-carbamoyl]-3-methyl-[3- 14 C]quinoxaline-1,4-dioxide([3- 14 C]Olaquindox) was synthesized from barium[ 14 C]carbonate (22 mmoles; 1.15 Ci) via [1- 14 C]acetic acid, sodium[1- 14 C]acetate, [1- 14 C]acetylchloride, ethyl[3- 14 C]acetoacetate and 2-carbethoxy-3-methyl-[3- 14 C]quinoxaline-1,4-dioxide with an overall yield of 10%, based on barium[ 14 C]carbonate. The radiochemical purity was better than 98% (tlc). The specific activities of three preparations were 10.5, 8.4 and 5.45 μCi/mg respectively. [phenyl-U- 14 C]Olaquindox was synthesized starting from [U- 14 C]aniline (19.8 mmoles; 284.4 mCi). Intermediate products were N-acetyl[U- 14 C]aniline, 2-nitro-N-acetyl[U- 14 C]aniline, 2-nitro[U- 14 C]aniline and [U- 14 C]benzofurazanoxide. The total yield was 50% as calculated for [U- 14 C]aniline. At calibration samples of two preparations showed specific activities of 49.5 and 11.1 μCi/mg respectively. The radiochemical purity was checked by tlc and exceeded 98%. (author)

  12. Insights into the mechanism and catalysis of oxime coupling chemistry at physiological pH.

    Science.gov (United States)

    Wang, Shujiang; Gurav, Deepanjali; Oommen, Oommen P; Varghese, Oommen P

    2015-04-07

    The dynamic covalent-coupling reaction involving α-effect nucleophiles has revolutionized bioconjugation approaches, due to its ease and high efficiency. Key to its success is the discovery of aniline as a nucleophilic catalyst, which made this reaction feasible under physiological conditions. Aniline however, is not so effective for keto substrates. Here, we investigate the mechanism of aniline activation in the oxime reaction with aldehyde and keto substrates. We also present carboxylates as activating agents that can promote the oxime reaction with both aldehyde and keto substrates at physiological pH. This rate enhancement circumvents the influence of α-effect by forming H-bonds with the rate-limiting intermediate, which drives the reaction to completion. The combination of aniline and carboxylates had a synergistic effect, resulting in a ∼14-31-fold increase in reaction rate at pD 7.4 with keto substrates. The biocompatibility and efficiency of carboxylate as an activating agent is demonstrated by performing cell-surface oxime labeling at physiological pH using acetate, which showed promising results that were comparable with aniline. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  13. Enhancement of capacitance performance of activated carbon—Polyaniline composites by introducing methyl orange

    International Nuclear Information System (INIS)

    Jia Yujie; Jiang Jianchun; Sun Kang; Dai Tingyang

    2012-01-01

    Activated carbon–methyl orange–polyaniline (AC–MO–PAn) composites have been synthesized for the first time. The structural properties of the composites have been characterized with nitrogen absorption–desorption, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS). The electrostatic force between MO molecules and aniline (An) salt is assumed to promote the adsorption of aniline on the surface of AC. On the other hand, the sulfonic groups in MO molecules play a role of dopant and provide active sites for the polymerization of aniline. Although the loading amount and structure of PAn in as-prepared AC–MO–PAn composites and conventional AC–PAn composites are almost the same, the electrochemical measurements indicate that the AC–MO–PAn composites have preferable capacitive performance and are favorable to be used as the electrode materials in supercapacitors.

  14. Reductive Umpolung of Carbonyl Derivatives with Visible-Light Photoredox Catalysis: Direct Access to Vicinal Diamines and Amino Alcohols via α-Amino Radicals and Ketyl Radicals

    KAUST Repository

    Fava, Eleonora; Millet, Anthony; Nakajima, Masaki; Loescher, Sebastian; Rueping, Magnus

    2016-01-01

    Visible-light-mediated photoredox-catalyzed aldimine-aniline and aldehyde-aniline couplings have been realized. The reductive single electron transfer (SET) umpolung of various carbonyl derivatives enabled the generation of intermediary ketyl and α-amino radical anions, which were utilized for the synthesis of unsymmetrically substituted 1,2-diamines and amino alcohols. Anilines can be coupled with aldimines or aldehydes in a visible-light-mediated photoredox-catalyzed process. Reductive single electron transfer (SET) umpolung of the carbonyl derivatives leads to the generation of intermediary ketyl and α-amino radical anions, which were used for the synthesis of unsymmetrically substituted 1,2-diamines and amino alcohols.

  15. Comparison of two association models (Elliott-Suresh-Donohue and simplified PC-SAFT) for complex phase equilibria of hydrocarbon-water and amine-containing mixtures

    DEFF Research Database (Denmark)

    Grenner, Andreas; Schmelzer, Jürgen; von Solms, Nicolas

    2006-01-01

    , and water. Furthermore, the predictive capabilities of the models are investigated for four ternary systems composed of these components, which exhibit complex liquid-liquid(-liquid) equilibria (LLLE). Various aspects of association models which have an influence in the results are studied for the PC......, both models perform overall similarly for the binary systems, although ESD shows a remarkably good behavior despite its simplicity and the use of only the two-site scheme for all associating compounds. The prediction of the LLE in the ternary systems water + octane + aniline and water + CHA + aniline......Two Wertheim-based association models, the simplified PC-SAFT and the Elliott-Suresh-Donohue (ESD) equation of state, are compared in this work for the description of vapor-liquid equilibria (VLE) and liquid-liquid equilibria (LLE) in binary systems of aniline, cyclohexylamine (CHA), hydrocarbons...

  16. Synthesis and chemical modification of polymeric resins for the treatment of cations and aromatic hydrocarbons in produced oily water; Sintese de modificacao quimica de resina polimerica e aplicacao na remocao de cations e hidrocarbonetos aromaticos presentes em agua produzida

    Energy Technology Data Exchange (ETDEWEB)

    Aversa, Thiago M.; Rodrigues, Monique F.; Vieira, Helida V.P.; Queiros, Yure G.C.; Lucas, Elizabete F. [Universidade Federal do Rio de Janeiro, Instituto de Macromoleculas, Lab. de Macromoleculas e Coloides na Industria do Petroleo, Rio de Janeiro, RJ (Brazil)], e-mail: thiagoaversa@ima.ufrj.br

    2011-07-01

    The use of chemically modified resins in oily water treatment process is not very developed yet. Because of this, this work suggests to study the styrene and divinylbenzene sulfonation effect on oil and grease, aniline and calcium removal from the water. The aniline, oils and greases belong to a class of toxic organic compounds, with the Brazilian maximum limits established for disposal in CONAMA 393/2007, while the calcium ions belong to the group of cations of alkaline earth metals which improve hardness to the water, may cause fouling as carbonates and sulfates form. By using sulfonated resins in oily water treatment it is possible to remove not only oils and greases but also calcium and aniline. These kinds of polar compounds are removed because of the cation exchange capacity of resin. (author)

  17. The synthesis of 7-chloro-5-pentadeuteriophenyl-1-methyl-1H-1, 5-benzodiazepine-2,4(3H, 5H)dione ([2H5]clobazam)

    International Nuclear Information System (INIS)

    Borel, A.G.; Abbott, F.S.

    1990-01-01

    Pentadeuteriophenyl clobazam was synthesized in essentially quantitative isotopic purity, and characterized by 1 H-NMR and mass spectroscopy. The title compound was found to be >98% pure by HPLC, and its retention time (t R 6.17 min) was less than that of an authentic clobazam standard (t R 6.32 min). Of the five steps in the synthesis of clobazam, the most susceptible to deuterium exchange was the nucleophilic substitution of 2,4-dichloronitrobenzene by aniline-d 7 to form N-(5-chloro-2-nitrophenyl)penta-deuteriophenylamine. In this step, the isotopic impurity aniline-2,3,4,5-d 5 introduced protons from nitrogen into the ortho and para positions of the deuteriophenyl ring of N-(5-chloro-2-nitrophenyl)pentadeuteriophenylamine. (author)

  18. Studies on third-order optical nonlinearity and power limiting of conducting polymers using the z-scan technique for nonlinear optical applications

    Science.gov (United States)

    Pramodini, S.; Sudhakar, Y. N.; SelvaKumar, M.; Poornesh, P.

    2014-04-01

    We present the synthesis and characterization of third-order optical nonlinearity and optical limiting of the conducting polymers poly (aniline-co-o-anisidine) and poly (aniline-co-pyrrole). Nonlinear optical studies were carried out by employing the z-scan technique using a He-Ne laser operating in continuous wave mode at 633 nm. The copolymers exhibited a reverse saturable absorption process and self-defocusing properties under the experimental conditions. The estimated values of βeff, n2 and χ(3) were found to be of the order of 10-2 cm W-1, 10-5 esu and 10-7 esu respectively. Self-diffraction rings were observed due to refractive index change when exposed to the laser beam. The copolymers possess a lower limiting threshold and clamping level, which is essential to a great extent for power limiting devices. Therefore, copolymers of aniline emerge as a potential candidate for nonlinear optical device applications.

  19. Competitive reaction in hydrodenitrogenation and hydrodeoxygenation of coal-derived naphtha

    Energy Technology Data Exchange (ETDEWEB)

    Machida, M. (Idemitsu Kosan Co. Ltd., Tokyo (Japan). Central Research Lab.); Sakao, Y.; Ono, S. (Idemitsu Kosan Co. Ltd., Tokyo (Japan))

    1994-03-01

    The naphtha fraction derived from coal is expected to be one of the most suitable blending stocks for motor gasoline because of its high contents of cyclic hydrocarbons. However, since the contents of nitrogen and oxygen are high in the coal naphtha, the amounts of these elements must be reduced to acceptable levels. In this study, aiming to clarify the hydrodenitrogenation (HDN) and hydrodeoxygenation (HDO) performances of practical feed stocks, HDN and HDO of coal-derived naphtha and its model compounds were examined by using a catalyst Ni-Mo/Al2O3 group. There are tree types of nitrogen compounds, pyridine, pyrrole and aniline, in the coal-derived naphtha. Aniline type nitrogen compounds in the coal-derived naphtha are more resistant to HDN than pyridine type compounds, though aniline is more reactive than pyridine when the reaction is carried out individually. 14 refs., 7 figs., 3 tabs.

  20. The influence of some factors on the electrical conductivity and particle size of core/shell polystyrene/polyaniline composites

    Directory of Open Access Journals (Sweden)

    GORDANA D. NESTOROVIC

    2005-11-01

    Full Text Available The electrically conductive, micron-sized, core/shell polystyrene (PS/polyaniline (PANI composite particles were synthesized by chemical oxidative polymerization of aniline in the presence of micron-sized PS particles in 1 M HCl. The conditions of the dispersion polymerization of styrene were optimized. The influence of the initiator type employed for the chemical oxidative polymerization of aniline and the aniline (ANI concentration on the PS/PANI particle size and size distribution and their conductivity was investigated. The obtained results show that the conductivity of the samples increased with increasing ANI concentration. The conductivity of the PS/PANI composite particles obtained with the highest ANI concentration was of the same order of magnitude as that for PANI powder. The particle size did not depend on the concentration of ANI, while the particle size distribution was narrower at higher concentrations of ANI.

  1. The water soluble composite poly(vinylpyrrolidone–methylaniline: A new class of corrosion inhibitors of mild steel in hydrochloric acid media

    Directory of Open Access Journals (Sweden)

    R. Karthikaiselvi

    2017-02-01

    Full Text Available In recent years poly methyl aniline has been reported as one of the efficient corrosion inhibitors of mild steel in acidic media. In view of the major limitation of the insolubility of polymethyl aniline PMA, we propose to convert PMA into a water soluble composite using supporting polymer polyvinylpyrrolidone to get higher solubility and corrosion inhibition efficiency. The water soluble composite poly(vinylpyrrolidone-methyl aniline was synthesized by chemical oxidative polymerization and its inhibitive effect on mild steel in 1 M HCl has been investigated using weight loss and electrochemical techniques (potentiodynamic polarization studies and impedance spectroscopy. SEM and EDX analyses are carried out to establish a protective film formation on the metal surface.

  2. Reductive Umpolung of Carbonyl Derivatives with Visible-Light Photoredox Catalysis: Direct Access to Vicinal Diamines and Amino Alcohols via α-Amino Radicals and Ketyl Radicals

    KAUST Repository

    Fava, Eleonora

    2016-05-02

    Visible-light-mediated photoredox-catalyzed aldimine-aniline and aldehyde-aniline couplings have been realized. The reductive single electron transfer (SET) umpolung of various carbonyl derivatives enabled the generation of intermediary ketyl and α-amino radical anions, which were utilized for the synthesis of unsymmetrically substituted 1,2-diamines and amino alcohols. Anilines can be coupled with aldimines or aldehydes in a visible-light-mediated photoredox-catalyzed process. Reductive single electron transfer (SET) umpolung of the carbonyl derivatives leads to the generation of intermediary ketyl and α-amino radical anions, which were used for the synthesis of unsymmetrically substituted 1,2-diamines and amino alcohols.

  3. N-(2-Chlorophenyl-2-methylbenzamide

    Directory of Open Access Journals (Sweden)

    B. Thimme Gowda

    2008-08-01

    Full Text Available In the structure of the title compound (N2CP2MBA, C14H12ClNO, the conformations of the N—H and C=O bonds are trans to each other. Furthermore, the conformation of the N—H bond is syn to the ortho-chloro group in the aniline ring and the C=O bond is syn to the ortho-methyl substituent in the benzoyl ring, similar to what is observed in 2-chloro-N-(2-chlorophenylbenzamide and 2-methyl-N-phenylbenzamide. The amide group makes almost the same dihedral angles of 41.2 (14 and 42.2 (13° with the aniline and benzoyl rings, respectively, while the dihedral angle between the benzoyl and aniline rings is only 7.4 (3°. The molecules in N2CP2MBA are packed into chains through N—H...O hydrogen bonds.

  4. 2-Chloro-N-(3-chlorophenylbenzamide

    Directory of Open Access Journals (Sweden)

    B. Thimme Gowda

    2008-07-01

    Full Text Available In the structure of the the title compound, C13H9Cl2NO, the N—H and C=O groups are mutually trans. Furthermore, the conformation of the C=O group is syn to the ortho-chloro group in the benzoyl ring, while the N—H bond is anti to the meta-chloro group in the aniline ring. The amide group forms dihedral angles of 89.11 (19 and 22.58 (37°, respectively, with the benzoyl and aniline rings, while the benzoyl and aniline rings form a dihedral angle of 69.74 (14°. The molecules are linked into infinite chains through intermolecular N—H...O hydrogen bonds.

  5. Effect of Schiff's Bases as Corrosion Inhibitors on Mild Steel in Sulphuric Acid

    Directory of Open Access Journals (Sweden)

    R. K. Upadhyay

    2007-01-01

    Full Text Available Mass loss and thermometric methods have been used to study the corrosion inhibitory effect of synthesised Schiff's bases viz. N-(furfurilidine – 4- methoxy aniline (SB1, N-(furfurilidine – 4- methylaniline (SB2, N-(salicylidine – 4- methoxy aniline (SB3, N-(cinnamalidine – 4 –methoxy aniline (SB4 and N-(cinnamalidine - 2-methylaniline (SB5 on mild steel in sulphuric acid solutions. Results show that both methods have good agreement with each other and inhibition efficiency depends upon the concentration of inhibitor as well as that of acid. Maximum inhibition efficiency is shown at highest concentration of Schiff's bases at the highest strength of acid.

  6. STUDIES ON RADICAL POLYMERIZATION OF METHYL METHACRYLATE INITIATED WITH ORGANIC PEROXIDE-AMINE SYSTEMS

    Institute of Scientific and Technical Information of China (English)

    QIU Kunyuan; SHUI Li; FENG Xinde

    1984-01-01

    Radical polymerization of methyl methacrylate (MMA) initiated with various diacyl peroxideamine systems was studied. Benzoyl peroxide (BPO) and lauroyl peroxide (LPO) were used as diacyl peroxide component, N,N-dimethyl aniline (DMA) and its para substituted derivatives, i.e., N,N-dimethyl-p-toluidine (DMT), p-hydroxymethyl-N,N-dimethyl aniline (HDMA), p-nitro-N,N-dimethyl aniline (NDMA) and p-dimethylamino benzaldehyde (DMAB) were used as amine components. It was found that the peroxide-DMT systems give higher rates of bulk polymerization Rp of MMA than the organic hydroperoxide-DMT systems with the following descending order BPO-DMT>LPO-DMT>CHP (cumene hydroperoxide)-DMT>TBH (tert-butyl hydroperoxide)-DMT.The aromatic tertiary amines possess obvious structural effect on the Rp values in the diacyl peroxideamine system. The overall activation energy of MMA polymerization was determined and the kinetics of polymerization of MMA initiated with BPO-DMT system was investigated.

  7. Heavy atoms as molecular probes in studying the solvent dependence of the dynamics of triplet exciplexes

    International Nuclear Information System (INIS)

    Steiner, U.; Winter, G.

    1981-01-01

    Electron transfer reactions between thiopyronine triplet (acceptor 3 A + ) and the electron donors (D), aniline, p-Br-aniline and p-I-aniline, are investigated by flash spectroscopy in solvents of different viscosity and polarity. Due to the heavy-atom effect the radical yield becomes very sensitive to the solvent influence, which can be explained by the dynamic properties of a triplet exciplex ( 3 (AD + )) formed as a primary product in the reaction between acceptor triplet and donor. Whereas on variation of solvent viscosity the solvent cage effect on the dissociation of 3 (AD + ) is observed, a change in solvent polarity is suggested to affect the radiationless deactivation of 3 (AD + ) to the ground state of the components. (author)

  8. One-step synthesis of graphene/polyaniline hybrids by in situ intercalation polymerization and their electromagnetic properties

    Science.gov (United States)

    Chen, Xiangnan; Meng, Fanchen; Zhou, Zuowan; Tian, Xin; Shan, Liming; Zhu, Shibu; Xu, Xiaoling; Jiang, Man; Wang, Li; Hui, David; Wang, Yong; Lu, Jun; Gou, Jihua

    2014-06-01

    A new method is introduced for the preparation of graphene/polyaniline hybrids using a one-step intercalation polymerization of aniline inside the expanded graphite. The structural and morphological characterizations were performed by X-ray diffraction analysis, transmission electron microscopy and field emission scanning electron microscopy. Both the experimental and first-principles simulated results show that the aniline cation formed by aniline and H+ tends to be drawn towards the electron-enriched zone and to intercalate into the interlayer of graphite. Subsequently, an in situ polymerization leads to the separation of graphite into graphene sheet, resulting from the exothermic effect and more vigorous movements of the chain molecules of polyaniline. The interactions between polyaniline and graphene were confirmed by Fourier transform infrared spectroscopy and Raman spectra. In addition, the graphene/polyaniline hybrid exhibited a breakthrough in the improvement of microwave absorption.A new method is introduced for the preparation of graphene/polyaniline hybrids using a one-step intercalation polymerization of aniline inside the expanded graphite. The structural and morphological characterizations were performed by X-ray diffraction analysis, transmission electron microscopy and field emission scanning electron microscopy. Both the experimental and first-principles simulated results show that the aniline cation formed by aniline and H+ tends to be drawn towards the electron-enriched zone and to intercalate into the interlayer of graphite. Subsequently, an in situ polymerization leads to the separation of graphite into graphene sheet, resulting from the exothermic effect and more vigorous movements of the chain molecules of polyaniline. The interactions between polyaniline and graphene were confirmed by Fourier transform infrared spectroscopy and Raman spectra. In addition, the graphene/polyaniline hybrid exhibited a breakthrough in the improvement of

  9. Electrochemical Preparation of Polyaniline Nanowires with the Used Electrolyte Solution Treated with the Extraction Process and Their Electrochemical Performance

    Directory of Open Access Journals (Sweden)

    Ying Wu

    2018-02-01

    Full Text Available Electrochemical polymerization of aniline is one of the most promising methods to prepare polyaniline (PANI materials. However, during this process, the electrolyte solution must be replaced after electropolymerization of a certain time because of the generation and the accumulation of the by-products, which have significant effects on the morphology, purity and properties of PANI products. Treatment and recycling of the used electrolyte solution are worthwhile to study to reduce the high treatment cost of the used electrolyte solution containing aniline and its polymerization by-products. Here, the composition of the used electrolyte solution was separated and determined by high performance liquid chromatography coupled with diode array detection (HPLC-DAD in the range of ultraviolet and visible (UV-Vis light. The analysis results revealed that the used electrolyte solution consisted of aniline, p-hydroquinone (HQ, p-benzoquinone (BQ, co-oligomers of aniline and p-benzoquinone (CAB and acid. Then, n-octanol and 2-octanone were selected as extracts to remove HQ, BQ and CAB from the used electrolyte solution. Following that, the recycled electrolyte solution was prepared by adjusting the concentration of aniline and acid of the aqueous phase, and the electrochemical polymerization process was conducted. Finally, the obtained PANI was characterized by scanning electron microscope (SEM and electrochemical methods. The experimental results clearly demonstrate that the morphology and specific capacitance of PANI produced from the recycled electrolyte solution can be recovered completely. This research paves the way for reusing the used electrolyte solution for aniline electrochemical polymerization.

  10. Electrochemical Preparation of Polyaniline Nanowires with the Used Electrolyte Solution Treated with the Extraction Process and Their Electrochemical Performance.

    Science.gov (United States)

    Wu, Ying; Wang, Jixiao; Ou, Bin; Zhao, Song; Wang, Zhi; Wang, Shichang

    2018-02-12

    Electrochemical polymerization of aniline is one of the most promising methods to prepare polyaniline (PANI) materials. However, during this process, the electrolyte solution must be replaced after electropolymerization of a certain time because of the generation and the accumulation of the by-products, which have significant effects on the morphology, purity and properties of PANI products. Treatment and recycling of the used electrolyte solution are worthwhile to study to reduce the high treatment cost of the used electrolyte solution containing aniline and its polymerization by-products. Here, the composition of the used electrolyte solution was separated and determined by high performance liquid chromatography coupled with diode array detection (HPLC-DAD) in the range of ultraviolet and visible (UV-Vis) light. The analysis results revealed that the used electrolyte solution consisted of aniline, p-hydroquinone (HQ), p-benzoquinone (BQ), co-oligomers of aniline and p-benzoquinone (CAB) and acid. Then, n-octanol and 2-octanone were selected as extracts to remove HQ, BQ and CAB from the used electrolyte solution. Following that, the recycled electrolyte solution was prepared by adjusting the concentration of aniline and acid of the aqueous phase, and the electrochemical polymerization process was conducted. Finally, the obtained PANI was characterized by scanning electron microscope (SEM) and electrochemical methods. The experimental results clearly demonstrate that the morphology and specific capacitance of PANI produced from the recycled electrolyte solution can be recovered completely. This research paves the way for reusing the used electrolyte solution for aniline electrochemical polymerization.

  11. One–pot synthesis and electrochemical properties of polyaniline nanofibers through simply tuning acid–base environment of reaction medium

    International Nuclear Information System (INIS)

    Li, Tao; Zhou, Yi; Liang, Banglei; Jin, Dandan; Liu, Na; Qin, Zongyi; Zhu, Meifang

    2017-01-01

    Highlights: •Presenting a facile one–pot approach to prepare polyaniline nanofibers through simply tuning acid–base environment of reaction medium. •Determining the role of aniline oligomers play in the formation of polyaniline nanofibers. •Demonstrating the feasibility of polyaniline nanofibers as high–performance electrode materials for supercapacitors. -- Abstract: A facile and efficient one–pot approach was presented to prepare polyaniline (PANi) nanofibers through simply tuning acid–base environment of reaction medium without the assistance of templates or use of organic solvents, in which aniline oligomers formed in the alkaline solution were used as “seeds” for the oriented growth of PANi chains under acidic conditions. The as–prepared PANi nanofibers were investigated by field–emission scanning electron microscopy, ultraviolet–visible spectroscopy, Fourier transform infrared spectroscopy and X–ray diffraction technology. Furthermore, the electrochemical properties were evaluated by cyclic voltammetry, galvanostatic charge–discharge test, and electrochemical impedance spectroscopy. More attentions were paid to the influence of aniline concentrations in alkaline and acidic reaction medium on the morphology, microstructure and properties of PANi nanofibers. It can be found that aniline concentration in alkaline medium has a stronger impact on the electrical and electrochemical properties of final products, however, their morphologies obviously depend on aniline concentration in acidic solution. Moreover, PANi nanofibers prepared at aniline concentrations of 48 mM in alkaline medium and 0.2 M in acidic medium exhibits the largest specific capacitance of 857.2 F g −1 at the scan rate of 5 mV s −1 , and capacitance retention of 63.8% after 500 cycles. It is demonstrated that such one–pot approach can present a low cost and environmental friendly route to fabricate PANi nanofibers in fully aqueous solution as high

  12. Rechargeable lithium/polymer cathode batteries

    Science.gov (United States)

    Osaka, Tetsuya; Nakajima, Toshiki; Shiota, Koh; Owens, Boone B.

    1989-06-01

    Polypyrrole (PPy) and polyaniline (PAn) were investigated for cathode materials of rechargeable lithium batteries. PPy films prepared with PF6(-) anion and/or platinum substrate precoated with nitrile butadiene rubber (NBR) were excellent cathode materials because of rough and/or highly oriented film structure. PAn films were successfully prepared from non-aqueous propylene carbonate solution containing aniline, CF3COOH and lithium perchlorate. Its acidity strongly affects the anion doping-undoping behavior. The PAn cathode prepared in high acidic solution (e.g., 4:1 ratio of acid:aniline) gives the excellent battery performance.

  13. The Effect of Temperature on the Production of Nitrobenzene

    Science.gov (United States)

    Agustriyanto, R.; Sapei, L.; Rosaline, G.; Setiawan, R.

    2017-02-01

    Nitrobenzene is a compound derived from benzene and quite fundamental in the petrochemical industry. One of which is in the manufacture of aniline. Aniline has an important role as dyes, synthetic rubber materials, rocket fuels and pharmaceuticals. Nitrobenzene can be synthesized by the nitration reaction of benzene. The purpose of the research is to design synthesis process of nitrobenzene by using Aspen Hysys simulator. The effect of changes in operating condition on nitrobenzene will be investigated. The benefits of the research are to obtain the optimum operating temperature for nitrobenzene production so that the use of utility can be minimized.

  14. Synthesis of polyaniline catalysed by Cu(I), Ni(II) and Fe(II) supported on the polyethylene-i-acrylic acid copolymer

    International Nuclear Information System (INIS)

    Hernandez, L.; Urena, F.; Lopez, R.

    1997-01-01

    In this study the active sites of acrylic acid (AA) were grafted in low density polyethylene (PEBD) using gamma radiation. Subsequently, the graft copolymer PEBD-i-AA was coordinated with different metals such as copper, nickel and iron. The organometallic copolymers so formed were used as catalysts in the aniline polymerization reaction. Finally, it was realized the characterization of the obtained products, determining their thermal properties, copolymer graft percentage, quantification of the metal contained in the complex as well as polymerization and electric conductivity percentages of the poly aniline film. (Author)

  15. Synthesis of polyaniline catalysed by Cu(I), Ni(II) and Fe(II) supported on the polyethylene-i-acrylic acid copolymer; Sintesis de polianilina catalizada por Cu(I), Ni(II) y Fe(II), soportados en el copolimero polietileno-i-acido acrilico

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez, L.; Urena, F.; Lopez, R. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1997-07-01

    In this study the active sites of acrylic acid (AA) were grafted in low density polyethylene (PEBD) using gamma radiation. Subsequently, the graft copolymer PEBD-i-AA was coordinated with different metals such as copper, nickel and iron. The organometallic copolymers so formed were used as catalysts in the aniline polymerization reaction. Finally, it was realized the characterization of the obtained products, determining their thermal properties, copolymer graft percentage, quantification of the metal contained in the complex as well as polymerization and electric conductivity percentages of the poly aniline film. (Author)

  16. Electrical transport of SiNWs array after covalent attachment of new organic functionalities

    Directory of Open Access Journals (Sweden)

    Marianna Ambrico

    2012-05-01

    Full Text Available Modification of the electrical transport of a random network of silicon nanowires assembled on n‐ silicon support, after silicon nanowires functionalization by chlorination/alkylation procedure , is here described and discussed. We show that the organic functionalities induce charge transfer at single SiNW and produce doping‐like effect that is kept in the random network too. The\tSiNWs\tnetwork\talso\tpresents\ta\tsurface recombination velocity lower than that of bulk silicon. Interestingly, the functionalized silicon nanowires/n‐Si junctions display photo‐yield and open circuit voltages higher than those including oxidized silicon nanowire networks. Electrical properties stability in time of junctions embedding propenyl terminated silicon nanowires network and transport modification after secondary functionalization is also shown. These results suggest a possible route for the integration of functionalized\tSi\tnanowires,\talthough\trandomly distributed, in stable large area photovoltaic or molecule sensitive based devices.

  17. Biofumigation for control of pale potato cyst nematodes: activity of brassica leaf extracts and green manures on Globodera pallida in vitro and in soil.

    Science.gov (United States)

    Lord, James S; Lazzeri, Luca; Atkinson, Howard J; Urwin, Peter E

    2011-07-27

    The effects of brassica green manures on Globodera pallida were assessed in vitro and in soil microcosms. Twelve of 22 brassica accessions significantly inhibited the motility of G. pallida infective juveniles in vitro. Green manures of selected brassicas were then incorporated into soil containing encysted eggs of G. pallida. Their effect on egg viability was estimated by quantifying nematode actin 1 mRNA by RT-qPCR. The leaf glucosinolate profiles of the plants were determined by high-performance liquid chromatography. Three Brassica juncea lines (Nemfix, Fumus, and ISCI99) containing high concentrations of 2-propenyl glucosinolate were the most effective, causing over 95% mortality of encysted eggs of G. pallida in polyethylene-covered soil. The toxic effects of green manures were greater in polyethylene-covered than in open soil. Toxicity in soil correlated with the concentration of isothiocyanate-producing glucosinolate but not total glucosinolate in green manures.

  18. Radioprotective Effect of Alk(enyl Thiosulfates Derived from Allium Vegetables against DNA Damage Caused by X-Ray Irradiation in Cultured Cells: Antiradiation Potential of Onions and Garlic

    Directory of Open Access Journals (Sweden)

    Hye-Sook Chang

    2012-01-01

    Full Text Available To evaluate a radioprotective effect of sodium n-propyl thiosulfate (NPTS and sodium 2-propenyl thiosulfate (2PTS derived from onions and garlic, respectively, rat hepatoma H4IIE cells and mouse lymphoma L5178Y cells were preincubated with each of these compounds for 48 hours at 37°C before receiving 10 Gy of X-ray irradiation. Cell damage caused by the irradiation was quantified as comet tail moment, which represents the degree of DNA damage. X-ray-induced DNA damage was significantly decreased in both H4IIE and L5178Y cells by micromolar concentrations of NPTS and 2PTS compared with the control without the compounds. The protective effect was more potent with 2PTS than NPTS. Onions and garlic have antiradiation potential.

  19. New neolignans from Krameria tomentosa A. St.-Hil

    Energy Technology Data Exchange (ETDEWEB)

    Madeiro, Sara A.L.; Lucena, Hellane F.S. de; Siqueira, Caroline D.; Duarte, Marcelo C.; Barbosa Filho, Jose M.; Silva, Marcelo S. da; Tavares, Josean F., E-mail: josean@ltf.ufpb.br [Universidade Federal da Paraiba (UFPB), Joao Pessoa, PB (Brazil). Departamento de Ciencias Farmaceuticas; Braz-Filho, Raimundo [Universidade Estadual do Norte Fluminense (UENF), Campos dos Goytacazes, RJ (Brazil). Laboratorio de Ciencias Quimicas

    2012-11-15

    A phytochemical investigation of the roots of Krameria tomentosa A. St.-Hil. led to the isolation of five neolignans, two of them with novel structures [1,1'-(E)-propenyl-4-methoxy- 3,4'-oxyneolignan (ottomentosa) and 2-(2'-hydroxy-4',6'-dimethoxyphenyl)benzofuran- 5-carboxylic acid (sobraline)] and three known compounds [eupomatenoid 6, dihydrocarinatidin and 2-(2',4'-dihydroxyphenyl)-5-(E)-propenylbenzofuran]. The structural characterization of the compounds isolated was established based on infrared spectroscopy, mass spectrometry, one- and two-dimensional nuclear magnetic resonance, along with comparison with spectral data described in the literature. (author)

  20. UV absorption and photoisomerization of p-methoxycinnamate grafted silicone.

    Science.gov (United States)

    Pattanaargson, Supason; Hongchinnagorn, Nantawan; Hirunsupachot, Piyawan; Sritana-anant, Yongsak

    2004-01-01

    p-Methoxycinnamate moieties, UV-B-absorptive chromophores of the widely used UV-B filter, 2-ethylhexyl p-methoxycinnamate (OMC), were grafted onto the 7 mol% amino functionalized silicone polymer through amide linkages. Comparing with OMC, the resulting poly [3-(p-methoxycinnamido)(propyl)(methyl)-dimethyl] siloxane copolymer (CAS) showed less E to Z isomerization when exposed to UV-B light. The absorption profiles of the product showed the maximum absorption wavelength to be similar to that of OMC but with less sensitivity to the type of solvent. Poly (methylhydrosiloxane) grafted with 10 mol% p-methoxycinnamoyl moieties was prepared through hydrosilylations of 2-propenyl-p-methoxycinnamate, in which the resulting copolymer showed similar results to those of CAS.