WorldWideScience

Sample records for calixarenes

  1. Calixarene-supported clusters

    DEFF Research Database (Denmark)

    Taylor, Stephanie M.; McIntosh, Ruaraidh D.; Piligkos, Stergios; Dalgarno, Scott J.; Brechin, Euan K.

    2012-01-01

    A combination of complementary cluster ligands results in the formation of a new calixarene-supported ferromagnetic [Mn(5)] cage that displays the characteristic bonding modes of each support.......A combination of complementary cluster ligands results in the formation of a new calixarene-supported ferromagnetic [Mn(5)] cage that displays the characteristic bonding modes of each support....

  2. Calixarene-based receptors for molecular recognition

    OpenAIRE

    YILMAZ, Mustafa; ERDEMİR, Serkan

    2013-01-01

    Calixarene-based molecular receptors have been a widely developing area in material science and technology for the last few decades. Due to their bowl-shaped geometry, calixarene macrocycles are used as hosts allowing organic and inorganic guests to coordinate/sorb onto their cavity. This work briefly reviews the recent development of calixarenes.

  3. Calixarene cleansing formulation for uranium skin contamination.

    Science.gov (United States)

    Phan, Guillaume; Semili, Naïma; Bouvier-Capely, Céline; Landon, Géraldine; Mekhloufi, Ghozlene; Huang, Nicolas; Rebière, François; Agarande, Michelle; Fattal, Elias

    2013-10-01

    An oil-in-water cleansing emulsion containing calixarene molecule, an actinide specific chelating agent, was formulated in order to improve the decontamination of uranium from the skin. Commonly commercialized cosmetic ingredients such as surfactants, mineral oil, or viscosifying agents were used in preparing the calixarene emulsion. The formulation was characterized in terms of size and apparent viscosity measurements and then was tested for its ability to limit uranyl ion permeation through excoriated pig-ear skin explants in 24-h penetration studies. Calixarene emulsion effectiveness was compared with two other reference treatments consisting of DTPA and EHBP solutions. Application of calixarene emulsion induced the highest decontamination effect with an 87% decrease in uranium diffusion flux. By contrast, EHBP and DTPA solutions only allowed a 50% and 55% reduction of uranium permeation, respectively, and had the same effect as a simple dilution of the contamination by pure water. Uranium diffusion decrease was attributed to uranyl ion-specific chelation by calixarene within the formulation, since no significant effect was obtained after application of the same emulsion without calixarene. Thus, calixarene cleansing emulsion could be considered as a promising treatment in case of accidental contamination of the skin by highly diffusible uranium compounds. PMID:23982616

  4. Electrical and structural properties of calixarene Langmuir-Blodgett films

    International Nuclear Information System (INIS)

    A material which possesses a temperature dependent polarisation is known as pyroelectric. The effect is observed only in materials whose polar molecules are arranged in a non-centrosymmetric fashion. Whenever a pyroelectric material is subjected to a changing temperature, it will generate a pyroelectric current. This thesis reports the manifestation of the pyroelectric effect in Langmuir-Blodgett films containing calixarene molecules. The synthetic chemist has the ability to add functional -carboxyl or -amino groups around the lower rim of the calixarene molecule, so rendering it polar. Use of the alternate layer deposition technique to build up multilayer assemblies of alternating -carboxyl substituted calixarene with amino substituted calixarene has produced pyroelectric LB films of calixarenes with some of the highest pyroelectric coefficients ever recorded for LB devices: 15μCm-2K-1. This study has identified an optimum thickness effect within pyroelectric calixarene LB films. The thermal stability of the pyroelectric device has been dramatically improved by the addition of heavy metal ions to the LB matrix. The temporal stability of the device was also found to be constant over more than 72 hours continuous testing. X-ray reflectometry measurements on both centrosymmetric and non-centrosymmetric cadmium substituted LB films of calixarenes have provided direct evidence of their multilayer structure. The reflectivity profiles exhibited both interference fringes and one or more Bragg peaks. Simulations of the experimental results have been made for a series of structural models based on the recognised conformations of calixarenes, and it was shown that the pinched loop conformation allows an LB film to be built up which has the correct total thickness and bilayer spacing. The simulated reflectivity profile is in excellent agreement with that obtained in the experiments. The model proposed works well for both the centrosymmetric structures and the pyroelectric LB

  5. Lanthanides and actinides extraction by calixarenes containing CMPO groups

    International Nuclear Information System (INIS)

    In the framework of the French program SPIN concerning the radioactive waste management, researches are performed to develop processes allowing the separation of long-lived radioisotopes in order to their transmutation or their specific conditioning. These studies deal with the extraction and the separation of trivalent lanthanides and actinides in acid solution. Many systems ''calixarene-diluent-aqueous phase'' are examined by extraction liquid-liquid and membrane transport. The extraction efficiency and the selectivity of the synthesized calixarene-CMPO and of the CMPO are compared with these cations, as the nitric acid extraction by these molecules. (A.L.B.)

  6. Synthesis of new calixarene-based lubricant additives

    OpenAIRE

    Burlini, Alessandro

    2016-01-01

    The lubricants are normally composed by base oils and a number of additives which are added to improve the performances of the final product. In this work, which is due to the collaboration between ENI S.p.A. and Prof. Casnati’s group, significant results in the application of calixarene structures to two classes of lubricant additives (viscosity index improvers and detergents) were shown. In particular, several calix[8]arene derivatives were synthesized to use as core precursors in the...

  7. CATALYTIC ACTIVITIES OF RARE-EARTH CALIXARENE COMPLEXES IN POLYMER SYNTHESES

    Institute of Scientific and Technical Information of China (English)

    Zhi-quan Shen

    2005-01-01

    The studies of our group on the catalytic activities of rare earth calixarene complexes in polymer syntheses are reviewed. Rare earth calixarene complexes are effect catalysts for the polymerizations of butadiene, isoprene, ethylene,styrene, propylene oxide, styrene oxide, trimethylene carbonate and 2,2-dimethyl-trimethylene carbonate.

  8. Flourishing Development in Calixarene Chemistry%蓬勃发展的杯芳烃化学

    Institute of Scientific and Technical Information of China (English)

    张来新; 朱海云

    2014-01-01

    This paper introduced the structural features,generation,development and applications of calixarene. Emphases were put on three parts:①click synthesis and application of new calixarene;②synthesis and applications of various series of new calixarenes;③synthesis and selective complexation to metal ions of new calixarenes. Future developments of calixarene are prospected in the end.%简要介绍了杯芳烃的结构特征、产生、发展及应用,详细介绍了:①新型杯芳烃的点击合成及应用;②多种系列新型杯芳烃的合成及应用;③新型杯芳烃的合成及其对金属离子的选择性络合作用。并对杯芳烃的发展进行了展望。

  9. Calixarenes: Versatile molecules as molecular sensors for ion recognition study

    Indian Academy of Sciences (India)

    Subrata Patra; Debdeep Maity; Ravi Gunupuru; Pragati Agnihotri; Parimal Paul

    2012-11-01

    This article presents a brief account on designing of calixarene-based molecular sensor for recognition of various metal ions and anions and also different analytical techniques to monitor the recognition event. This review focuses only on calix[4]arene derivatives, in which mainly the lower rim is modified incorporating either crown moiety to make calix-crown hybrid ionophore to encapsulate metal ions or some fluoregenic inorganic and organic moieties to use it as signalling unit. In order to investigate effect of conformation of the calixarene unit and steric crowding on ion selectivity, designing of these molecules have been made using both the cone and 1,3-alternate conformations of the calixarene unit and also incorporating bulky tert-butyl group in few cases to impose controlled steric crowding. Among various ions, here focuses are mainly on biologically and commercially important alkali metal ion such as K+, toxic metal ions such as Hg2+, Pb2+, Cd2+, important transition metal ion such as Cu2+ and toxic anion like F−. The techniques used to monitor the recognition event and also to determine binding constants with strongly interacting ions are fluorescence, UV-vis and 1H NMR spectroscopy. Most of the ionophores reported in this review have been characterized crystallographically, however no structural information (except one case) are incorporated in this article, as it will occupy space without significant enhancement of chemistry part. Different factors such as size of the ionophore cavity, size of metal ion, coordination sites/donor atoms, steric crowding and solvents, which determine selectivity have been discussed. Response of ion recognition process to different analytical techniques is another interesting factor discussed in this article.

  10. Synthesis of calixarenes and their extraction performance for ester catechins

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    A series of extractants (tert-butylcalix[6]arene, tert-butylcalix[8]arene and octeacetate of tert-butylcalix[8]arene) were synthesized, and their structures were identified by IR and 1H-NMR. The distribution behavior of ester catechins monomer in the aqueous and chloroform two-phase system containing one of calixarene was studied. The influences of different extractants,concentration of tert-butylcalix[8]arene and extraction temperature on the partition coefficients and the separation factors were investigated. The experiment results show that tert-butylcalix[8]arene is the best extractant that forms a more stable supramolecular compound with gallocatechin gallate (GCG) than with epigallocathechin gallate (EGCG) or epicatechin gallate (ECG). When the concentration ofp-tert-butylcalix[8]arene is 3.79 mmol/L, the extraction temperature is 4 ℃C, the partition coefficients of KGG cG, KECG,KEGG cG are 0.987, 0.629, 0.449, the separation factors ofα1 and α2 are 1.450 and 1.596, respectively. The important factors influencing the extraction properties of calixarene are discovered to be its cavity size and hydrogen bonding.

  11. Lanthanides and actinides extraction by calixarenes containing CMPO groups; Extraction des lanthanides et des actinides au moyen de calixarenes portant des groupements CMPO

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Carrera, A

    2001-07-01

    In the framework of the French program SPIN concerning the radioactive waste management, researches are performed to develop processes allowing the separation of long-lived radioisotopes in order to their transmutation or their specific conditioning. These studies deal with the extraction and the separation of trivalent lanthanides and actinides in acid solution. Many systems ''calixarene-diluent-aqueous phase'' are examined by extraction liquid-liquid and membrane transport. The extraction efficiency and the selectivity of the synthesized calixarene-CMPO and of the CMPO are compared with these cations, as the nitric acid extraction by these molecules. (A.L.B.)

  12. Study of Calixarene Inhibitor in the Secondary Cooling System of RSG-GAS

    International Nuclear Information System (INIS)

    Scales is among of the problems in secondary cooling system at Reaktor Serba Guna GA. Siwabessy (RSG-GAS) or pool reactor generally because it can decreased the efficiency of heat transfer in the heat exchanger therefore water flow plugged inside the pipes. There are several factors to form of scales, for instances water quality, water temperature, and flow rate. In this paper are described theoretically the effect of calixarene inhibitor to depress the scale growing in the secondary cooling system of RSG-GAS. Calixarene is organic inhibitor has aromatic chains, hollow structure form and four methoxy group supporting the strong complex to trap the Ca2+ or Mg2+ ion. The chelate complex between Ca2+ or Mg2+ dissolve in water therefore to close the large crystal possibly and to prevent crystal scale binding on the cooling pipes. The goals of study is to observe the calixarene behavior to the scale growing in secondary cooling of RSG-GAS. The method applied to study chemical structure dan calixarene properties, interaction between calixarene with crystal scale forming from Ca2+ and Mg2+ and theoretical calculation of inhibitor equivalent doses to precipitate Ca2+ or Mg2+ scales. Assuming that calixarene organic inhibitor mixed to secondary cooling system which from water resource without pretreatment and then to calculate metal complex dominant (Ca and Mg) equivalent to calixarene in the secondary cooling water. According to theoretical calculation gained that the equivalent doses in 1 m3 water is 1.3614 g per liter. From the assessment result has been identified that the scale problems in the secondary cooling system were understood so that the lowering of heat transfer efficiency in the heat exchanger avoided. (author)

  13. Separation of lanthanides (III) and actinides (III) by calixarenes containing acetamide-phosphine oxides functions

    International Nuclear Information System (INIS)

    The carbamoyl methyl phosphine oxide CMPO is the well known extractant of the TRUEX process for extraction of actinides from highly salted acidic wastes. In the framework of an European research contract coordinated by CEA/DDCC. V. Boehmer (Mainz, Germany) synthesized calix(4)arenes bearing CMPO moieties either on the wide rim, or on the narrow rim. Some of these calixarenes used at a concentration 10-3 M are more efficient than CMPO used at a two hundred fifty fold higher concentration. Moreover, calixarene skeleton leads to a strong selectivity among lanthanides, this selectivity is much less obvious for CMPO. Selectivity order is reversed according to whether CMPO unit is borne by the wide rim or the narrow rim. The most efficient calixarenes allow actinides to be separated from most of the lanthanides except the lightest ones. (authors)

  14. A calixarene-based ion-selective electrode for thallium(I) detection

    Energy Technology Data Exchange (ETDEWEB)

    Chester, Ryan [Nanochemistry Research Institute, Department of Chemistry, Curtin University, GPO Box U1987, Perth, Western Australia 6845 (Australia); Sohail, Manzar [Faculty of Science, Health, Education and Engineering, University of the Sunshine Coast, Locked Bag 4, Maroochydore DC, Queensland 4556 (Australia); Ogden, Mark I.; Mocerino, Mauro [Nanochemistry Research Institute, Department of Chemistry, Curtin University, GPO Box U1987, Perth, Western Australia 6845 (Australia); Pretsch, Ernö [ETH Zürich, Institute of Biogeochemistry and Pollutant Dynamics (IBP), Universitätstrasse 16, CH-8092, Zürich (Switzerland); De Marco, Roland, E-mail: rdemarc1@usc.edu.au [Nanochemistry Research Institute, Department of Chemistry, Curtin University, GPO Box U1987, Perth, Western Australia 6845 (Australia); Faculty of Science, Health, Education and Engineering, University of the Sunshine Coast, Locked Bag 4, Maroochydore DC, Queensland 4556 (Australia)

    2014-12-03

    Highlights: • Tuning of metal binding cavities in thallium(I) calixarene ionophores. • Novel calixarene-based ionophores with improved selectivity for thallium(I). • Sandwich membrane characterization of thallium(I) binding in novel calixarenes. • Improved selectivity and sensitivity with novel thallium(I) calixarene ionophores. • Solid contact ion-selective electrodes for novel thallium(I) calixarene ionophores. - Abstract: Three new calixarene Tl{sup +} ionophores have been utilized in Tl{sup +} ion-selective electrodes (ISEs) yielding Nernstian response in the concentration range of 10{sup −2}–10{sup −6} M TlNO{sub 3} with a non-optimized filling solution in a conventional liquid contact ISE configuration. The complex formation constants (log β{sub IL}) for two of the calixarene derivatives with thallium(I) (i.e. 6.44 and 5.85) were measured using the sandwich membrane technique, with the other ionophore immeasurable due to eventual precipitation of the ionophore during these long-term experiments. Furthermore, the unbiased selectivity coefficients for these ionophores displayed excellent selectivity against Zn{sup 2+}, Ca{sup 2+}, Ba{sup 2+}, Cu{sup 2+}, Cd{sup 2+} and Al{sup 3+} with moderate selectivity against Pb{sup 2+}, Li{sup +}, Na{sup +}, H{sup +}, K{sup +}, NH{sub 4}{sup +} and Cs{sup +}, noting that silver was the only significant interferent with these calixarene-based ionophores. When optimizing the filling solution in a liquid contact ISE, it was possible to achieve a lower limit of detection of approximately 8 nM according to the IUPAC definition. Last, the new ionophores were also evaluated in four solid-contact (SC) designs leading to Nernstian response, with the best response noted with a SC electrode utilizing a gold substrate, a poly(3-octylthiophene) (POT) ion-to-electron transducer and a poly(methyl methacrylate)–poly(decyl methacrylate) (PMMA–PDMA) co-polymer membrane. This electrode exhibited a slope of 58.4 mV decade

  15. Study of the alkaline cations complexation by photo-isomerizable calixarenes; Etude de la complexation de cations alcalins par des calixarenes photoisomerisables

    Energy Technology Data Exchange (ETDEWEB)

    Reynier, N.

    1996-04-25

    The first step to reduce the volume and the toxicity of radioactive waste coming from the spent fuel reprocessing is to separate long life radioisotopes from others ones with a shorter period. The aim of this study is to show that the control of the two phenomenons, complexation of the cation by the calixarenes and its de-complexation, can be envisaged by the introduction on the molecule of a chromophore group, azo benzene, able to modify the complexing site structure of the calixarenes with an isomerization trans-cis induced by ultraviolet radiation, and isomerization cis-trans thermally induced by a visible radiation. (N.C.). 112 refs., 78 figs., 23 tabs.

  16. COVALENTLY ATTACHED MULTILAYER ULTRA-THIN FILMS FROM DIAZORESIN AND CALIXARENES

    Institute of Scientific and Technical Information of China (English)

    Zhao-hui Yang; Wei-xiao Cao

    2003-01-01

    A kind of photosensitive ultra-thin film was fabricated from diazoresin (DR) and various calixarenes by using the self-assembly technique. Under UV irradiation both the ionic- and hydrogen bonds between the layers of the film will convert into covalent bonds. As a result, the stability of the film toward polar solvents increases dramatically.

  17. Supercritical carbon dioxide extraction of uranium from acidic medium employing Calixarenes

    International Nuclear Information System (INIS)

    Owing to inherent potential of liquid waste minimization and associated advantages, supercritical fluid extraction (SFE) employing CO2 has emerged as a promising separation process. Uranium being a nuclear material, study of its SFE assumes significance. In the present study SFE of uranium with various Calixarenes is carried out

  18. SOLUTION EFFECTS ON CESIUM COMPLEXATION WITH CALIXARENE CROWN ETHERS FROM LIQUID TO SUPERCRITICAL FLUIDS

    Science.gov (United States)

    Calixarene-crown ethers with rigid skeletons are superior to flexible crown ethers for separation of 137Cs from high level waste (HLW). However, this extraction methodology often requires undesirable solvents and the extraction efficiency is strongly dependent on the solvent pol...

  19. Trivalent lanthanide and actinide extraction by functionalized calixarenes study of the structure of complexes in solution by nuclear magnetic resonance

    International Nuclear Information System (INIS)

    The behaviour of different lanthanides and actinides with respect to their complexation by various ligands (in particular functionalized calixarenes) carrying acetamide-phosphine oxide groups (CMPO calixarenes) has been studied. These calixarenes allow the selective extraction of light lanthanides. A size effect of the cations has been evidenced. The substituents present on the lower and upper edges of the calixarene influence the extraction and its selectiveness. Studies of experimental conditions improvement have been carried out. It is shown that the de-extraction of trivalent cations extracted by CMPO calixarenes is possible using a very low concentration nitric acid solution. This requires the use of a chlorinated or alcoholic diluent. Transport experiments using this re-extraction phase slightly acidified have shown identical separation properties to those detected in liquid-liquid extraction. Nuclear magnetic resonance (NMR) is a spectroscopic method used to identify some structural parameters in solution. The NMR nuclei relaxation theory allows to link different physical data to the relaxation time of the nuclei of a molecule. The influence of the presence of paramagnetic lanthanide and actinide cations on different nuclei of the CMPO calixarene molecule has been studied. The determination of their respective relaxation time can lead to the average distances between the cation and these nuclei. This work has led to the determination of the correlation times and to a first evaluation of the average position of the cations. (J.S.)

  20. Investigation of actinide extraction by calixarenes. Application to radio-toxicological analysis

    International Nuclear Information System (INIS)

    As measurement of uranium in urine is one of the controls performed for a dosimetric survey of workers exposed to risk of internal contamination, this research thesis aimed at the selection of a new ligand able to selectively extract uranium (even traces of uranium) from urine. Optimal extraction conditions have been achieved and an analysis protocol has been proposed. A calixarene compound comprising three carboxylic functions has been chosen as selective ligand for the uranyl ion. Extraction properties of this calixarene have been studied in a two phase system. The influence of complexing anions generally present in urines (such as chloride, sulphate or phosphate ions) has been assessed. This protocol allows uranium to be isolated in a more repeatable, while simpler and quicker way. Moreover, after de-extraction, uranium measurement can be quickly performed by ICP-MS (Inductively Coupled Plasma - Mass Spectrometry)

  1. High extraction ability of 1,3-dialkynyl calixarene towards mercury(Ⅱ) ion

    Institute of Scientific and Technical Information of China (English)

    Lin Bo Gong; Shu Ling Gong; Qin Zheng; Xiong Li; Yuan Yin Chen

    2007-01-01

    The reaction of 1,3-dipropyn-2-yloxycalix[4]arene with mercury(Ⅱ) acetate could give mercury-containing alkynyl calixarene polymer. The extraction behavior of 1,3-dipropyn-2-yl-oxycalix[4]arene towards mercury(H) ion was examined. When the mole ratio of Hg2+/calixarene was 1∶1, the extractive percent can reach to 99.1%, and the extraction capacity was up to 431 mg/g. It could also decrease the Hg2+ concentration from 5 to 0.85 mg/L, which was only 17% of the national standard of effluent and satisfied the national standard of drinking water. The extraction process included chemical reaction.

  2. Cs selective extraction from high level liquid wastes with crown calixarenes: Where are we today?

    International Nuclear Information System (INIS)

    This paper deals with the developments carried out around the caesium process these last years to prove its scientific feasibility, then to acquire technical feasibility.The crown-calixarenes molecules showed their efficiency towards selective Cs extraction and their superiority with respect to the traditional alkaline cations extraction systems: crown-ether molecules. After acquisition of experimental data, calculations of flow-sheet were carried out. Tests, first on simulated effluents, then on real effluents, demonstrated the scientific feasibility of the concept. The technical feasibility is currently in progress through the following studies: - hydrodynamic and transfer studies; - kinetics data are in progress; - calixarene molecule are known to be highly resistant molecules towards hydrolysis and radiolysis phenomena but regeneration studies have to be taken into account to define the industrial process. (authors)

  3. Study of the alkaline cations complexation by photo-isomerizable calixarenes

    International Nuclear Information System (INIS)

    The first step to reduce the volume and the toxicity of radioactive waste coming from the spent fuel reprocessing is to separate long life radioisotopes from others ones with a shorter period. The aim of this study is to show that the control of the two phenomenons, complexation of the cation by the calixarenes and its de-complexation, can be envisaged by the introduction on the molecule of a chromophore group, azo benzene, able to modify the complexing site structure of the calixarenes with an isomerization trans-cis induced by ultraviolet radiation, and isomerization cis-trans thermally induced by a visible radiation. (N.C.). 112 refs., 78 figs., 23 tabs

  4. The Liquid-Liquid Extraction of Toxic Metals (Cd, Hg and Pb by Calixarenes

    Directory of Open Access Journals (Sweden)

    D. Max Roundhill

    2009-12-01

    Full Text Available Toxic metals (Cd, Hg and Pb are mostly present in the environment due to natural phenomenon and human activities as well. Exposure of these non-essential elements in the environment causes severe effects. They are known to cause problems in humans as well as in aquatic life. In this work, we demonstrate various studies regarding liquid-liquid extraction of selected ions with different functionalized calixarenes. This review article briefly discusses several molecular designs of calixarenes for divalent ion (Cd2+, Hg2+ and Pb2+ recognition; as well as the relationship between structure and selectivity of the macrocycles is elaborated. The article does not, however, attempt to cover all of the different approaches to these toxic metal ions extraction.

  5. Charge transfer in porphyrin–calixarene complexes: ultrafast kinetics, cyclic voltammetry, and DFT calculations

    Czech Academy of Sciences Publication Activity Database

    Kubát, Pavel; Šebera, Jakub; Záliš, Stanislav; Langmaier, Jan; Fuciman, M.; Polívka, T.; Lang, Kamil

    2011-01-01

    Roč. 13, č. 15 (2011), s. 6947-6954. ISSN 1463-9076 R&D Projects: GA ČR GAP208/10/1678; GA ČR GA203/09/0691 Institutional research plan: CEZ:AV0Z40400503; CEZ:AV0Z40320502 Keywords : porphyrin-calixarene complexes * voltammetry * DFT calculations Subject RIV: CF - Physical ; Theoretical Chemistry; CA - Inorganic Chemistry (UACH-T) Impact factor: 3.573, year: 2011

  6. Calixarenes and cations: a time-lapse photography of the big-bang.

    Science.gov (United States)

    Casnati, Alessandro

    2013-08-01

    The outstanding cation complexation properties emerging from the pioneering studies on calixarene ligands during a five-year period in the early 1980s triggered a big-bang burst of publications on such macrocycles that is still lasting at a distance of more than 30 years. A time-lapse photography of this timeframe is proposed which allows the readers to pinpoint the contributions of the different research groups. PMID:23792898

  7. Study of the simultaneous complexation of a cation and of an anion using functionalized calixarenes

    International Nuclear Information System (INIS)

    The chemical reprocessing of irradiated nuclear fuels leads to the production of high-level radioactive liquid wastes which contain long-lived toxic radioelements. In the framework of the long-term management of these wastes, important research work is carried out for the separation of these radioelements for their further transmutation or immobilization inside specific matrices. These radioelements are present in acid solutions of fission products in the form of cations (cesium), anions (technetium, selenium) and molecules (iodine). Crown calixarenes have been successfully used for the extraction of cesium thanks to their exceptional selectivities. This work is mainly based on the use of the chelating properties of calixarenes for the extraction of anionic radioelements. Calixarenes functionalized by amino-carbon chains have been selected. The synthesis of amine calix[4]arenes and calix[6]arenes is described and their extractive and ionophoretic properties with respect to radioelements are shown using aqueous selective separation techniques like the liquid-liquid extraction and the supported liquid membrane transport. Technetium and selenium are extracted by amine calixarenes from a 10-2 M aqueous solution of nitric acid. At this acidity, no selenium transport is observed, while technetium transport is efficient: the solution is quasi-totally decontaminated in 6 hours. Molecular iodine is efficiently extracted with a simple organic diluent, the 1,2-nitro-phenyl-hexyl-ether, from a strongly concentrated aqueous solution of nitric acid (HNO3 = 3 M). The transport of iodine becomes faster and more efficient when its concentration in the solution is higher. (J.S.)

  8. Counterion-Controlled Self-Sorting in an Amphiphilic Calixarene Micellar System.

    Science.gov (United States)

    Fernández-Abad, Silvia; Pessêgo, Márcia; Basílio, Nuno; García-Río, Luis

    2016-05-01

    Molecular recognition of small molecules and ions by artificial receptors in microheterogeneous media such as micelles and vesicles can, in principle, provide better models of biological systems in comparison with bulk solutions. In this work we have investigated the complexation of an organic fluorescent probe with amphiphilic calixarene receptor below and above the critical micelle concentration (CMC). For concentrations below the CMC, the probe forms a host-guest complex with the calixarene behaving like a traditional host-guest system operating in bulk solution. Above the CMC, multiple equilibrium processes are established and the probe can exchange between the recognition site of the calixarene in the monomeric state, micellized state and/or the micellar hydrophobic core. Careful analysis of the results obtained from NMR spectroscopy and fluorescence experiments allowed us to propose a quantitative model to describe the system. The increment of the local concentration of Na(+) counterions at the Stern layer displace the dye to the micelle core through competitive binding of Na(+) in the cavity of the receptor and is decisive for the observed self-sorting behavior. PMID:26879089

  9. Calixarene receptors in the selective separation of alachlor. Characterization of the separated complexes

    International Nuclear Information System (INIS)

    Pesticides have been necessary in the agriculture since the plagues control have been remedied thanks to them but it has also provoked pollution. Nowadays, there are several methods which help to decrease or remedy such a pollution provoked. Unfortunately, any of them work out the environmental problem totally. Therefore, alternatives have to be found. The organic and tri dimensional characteristics of these macrocycles afford them a high versatility in such a way that these hosts can interact with organic guests selectively. Alachlor is a chlorinated organic herbicide useful in the plagues control of annual grasses and many broad-leave weeds which grow in maize, peanuts and soyabean. The ability of calixarenes to host organic guests with chemical characteristics similar to pesticides let them to be good candidates to compete with others methods which are used presently to separate organic pesticides. In this direction one of the advantages of proposing the use of calixarenes is, its facility of being modified in the lower and/or upper rims, to adapt them to aqueous, organic, gaseous and aqueous-organic media. Once the characteristics of reagents informed in the literature were confirmed and complemented with others found in this work, we studied, in solution, the interaction of the calixarenes with alachlor using 1 x 10-5 to 1 x 10-3 M solutions in acetonitrile for calixarenes fitted with phosphinoyl pendant arms in the lower rim, BnbLn, n= 4, 6) and in chloroform for parents calixarenes (HnbLn n = 4, 6, 8). Meticulous studies monitored by UV-Vis and luminescence were carried out, and the best stoichiometry to be used in further studies resulted to be 1(host): 1(alachlor). Therefore, we chose the 1 x 10-4 M concentration to find how long the host-guest should be interacting in order to guarantee the formation in solution of the calixarene-alachlor species. It was found 168 h for the alachlor-BnbLn interaction while 165 h were necessary with HnbLn in dilute as

  10. Development of a pharmaceutical form containing calixarene molecules for the treatment of intact or injured skin contaminated by uranium

    International Nuclear Information System (INIS)

    The first objective of this research thesis was to develop a formulation containing a tricarboxylic calixarene for cutaneous application for the local treatment of skin contamination by uranium. A second objective is to assess the efficiency of a calixarene nano-emulsion for such a treatment. In a first part, the author proposes an overview of risks associated with skin contamination by uranium, and of current treatments and treatments under development. In the second part, the author presents the oil-in-water-type nano-emulsion, reports an in vitro assessment of the decontamination efficiency of the calixarene nano-emulsion, reports an in vivo assessment of this efficiency (on pig ear skin explants contaminated by uranium), and presents the main publications and a patent request related to this research work

  11. 我国杯芳烃化学的研究进展%Flourishing Development of calixarenes

    Institute of Scientific and Technical Information of China (English)

    张来新; 杨琼; 赵卫星

    2011-01-01

    This paper briefly introduces the structure features, characteristics, and the latest applications of calixarenes. The recent developments of various new type calixarenes are reviewed in details in the fields of syntesis, metal complex synthesis, and self-assembly.%简述了杯芳烃的结构特征、特性及应用,较为详细地综述了2010年以来杯芳烃研究的新进展.即:①多种新型杯芳烃的合成;②新型杯芳烃金属配合物的合成;③新型杯芳烃的自组装.

  12. Selective extraction of actinides and long lived fission products by functionalized calixarenes

    International Nuclear Information System (INIS)

    Selective extraction can be used for the removal of minor actinides or long lived fission products (93Zr, 99Tc,135Cs....) from Purex raffinate in order to enable their destruction by incineration or their disposal in very specific matrices. On the other hand, the selective removal of 90Sr, 137Cs and actinides allows waste to be de-categorized and to send the greatest part of the waste to the existing subsurface disposal. To achieve this aim, calix[4]arenes, macrocycles made up of phenolic units linked by methylene bridges, are used as building blocks for functionalized and pre-organized assemblies able to remove cations with a high efficiency and an important selectivity from acidic or high sodium content liquid waste. Calix[4]arene-crown-6, consisting of a calixarene frame maintained in a special conformation (1-3 alternate) by one or two polyethylene glycol bridges containing six oxygen atoms, display an exceptional efficiency for the extraction of cesium from acidic, neutral or alkaline media even in presence of large amounts of sodium. Various calix[4]arene tetra-alkyl ethers, substituted at the upper rim by CMPO-like functional group -NH-C(O)-CH2-P(O)Ph2, have been synthesized for the extraction of lanthanides and actinides. All these compounds are tremendously strong extractants compared with the commonly used CMPO. Complementary studies demonstrated the role of the pre-organization of these calixarenes: While CMPO displays a low discrimination of lanthanides, the extraction of lanthanides by calixarenes-like-CMPO strongly decreases as the atomic number of lanthanides increases. So this class of extractants makes possible a partial separation of minor actinides from lanthanides, it has to be noticed that this separation can be carried out from very acidic media. These examples demonstrate the interest of the calixarene frame for the synthesis of very specific extractants. We have to point out the promising role of the molecular modeling, that enables us, in

  13. The Design and Development of a Regenerative Separatory Column Using Calixarenes as a Polymeric Backbone for the Purification of Water from Urine

    Science.gov (United States)

    Polk, M.

    1999-01-01

    The objective of this research project is to design calixarenes, cup-shaped molecules, with the specific binding sites to the sodium chloride and nitrogen containing components of urine, such as urea and uric acid, in urine. The following partition of the research accomplishes this objective: (1) functionalization of calixarene, (2) development of a calixarene based medium for the separatory process, (3) design of the column regeneration protocol. Work was also accomplished in the area of temperature sensitive paint (TSP). Research was undertaken to design a TSP with insulating propertites. An important part of this research project is to discover the thermal conductivity of polymers for TSP.

  14. Ex vivo decrease in uranium diffusion through intact and excoriated pig ear skin by a calixarene nanoemulsion.

    Science.gov (United States)

    Spagnul, Aurélie; Bouvier-Capely, Céline; Phan, Guillaume; Landon, Géraldine; Tessier, Christine; Suhard, David; Rebière, François; Agarande, Michelle; Fattal, Elias

    2011-10-01

    Cutaneous contamination by radionuclides is a major concern in the nuclear industry. In case of skin exposure to uranium, no efficient emergency treatment is available to remove the actinide from the skin. For this purpose, we developed a nanoemulsion containing calixarene molecules displaying good chelating properties towards uranium. In this paper, we describe the ability of this formulation to trap uranium and limit its transfer from the cutaneous contaminated site into the blood. Uranium percutaneous diffusion kinetics was assessed with Franz cells over 24 h through intact and excoriated pig ear skin biopsies, after or without application of the nanoemulsion. Uranium distribution in the skin layers was analysed by SIMS microscopy. The results showed that prompt application of the calixarene nanoemulsion allows a 94% and 98% reduction of the amount of uranium diffused respectively through intact and excoriated skin. The formulation is still efficient in case of delayed application up to 30 minutes since the 24 h-uranium transfer through excoriated skin is reduced by 71%. Besides, no accumulation of uranium or uranium-calixarene chelate was observed in the different skin layers. In conclusion, this study demonstrated the efficiency of the calixarene nanoemulsion, which can be regarded as a promising treatment for uranium cutaneous contamination. PMID:21620969

  15. Impact of ionic liquids on europium and americium extraction by an upper rim phosphorylated calixarene

    International Nuclear Information System (INIS)

    The solvent extraction of europium and americium using the calixarene 5,11,17,23-tetrakis[dipropylphosphinylmethyl] 25,26,27,28-tetrapropoxycalix[4]arene (conical conformation) in the presence of ionic liquids with different natures was studied. It was shown that upper rim phosphorylated calixarene is able to extract europium and americium from nitric acid to dichloroethane by forming a 1:1 complex without the addition of ionic liquids. The distribution coefficients of americium are higher than those of europium in this case, but the isolation degrees of both elements are insufficient for this system to be useful in extraction technologies. The addition of the ionic liquid trihexyl(tetradecyl)phosphonium hexafluorophosphate increases the europium distribution coefficient by values ranging from twofold to more than two orders of magnitude at ionic liquid concentrations of 1 and 50 %, respectively. The values of the distribution coefficients for americium are increased by approximately 25-fold after a 50 % addition of the ionic liquid. (author)

  16. Calixarene ionic liquid modified silica gel: A novel stationary phase for mixed-mode chromatography.

    Science.gov (United States)

    Hu, Kai; Zhang, Wenfen; Yang, Huaixia; Cui, Yongxia; Zhang, Jingya; Zhao, Wenjie; Yu, Ajuan; Zhang, Shusheng

    2016-05-15

    A novel calixarene ionic liquid functionalized silica material was synthesized by the preparation of a new calixarene monomer and its grafting on mercaptopropyl modified silica gel. The material was characterized by infrared spectra, elemental analysis, and thermogravimetric analysis. To explore the retention mechanism of the stationary phase, linear solvation energy relationships (LSER) equation as an effective mathematical model was used. In addition to this, the distinct separation mechanisms were outlined by selected examples of chromatographic separations in the different modes. In reversed-phase liquid chromatography, this new stationary phase presented specific chromatographic performance when evaluated using alkylbenzenes, PAHs and phenols as solutes. Due to the existing polar functional groups, this stationary phase can also be used in hydrophilic interaction chromatography, six nucleosides and four ginsenosides were separated successfully in hydrophilic mode. Furthermore, anions can be separated on the column in anion exchange mode. Thus, this new material was can be applied as a new kind of mixed-mode stationary phase in liquid chromatography, which allows an exceptionally flexible adjustment of retention and selectivity by tuning the experimental conditions. PMID:26992535

  17. Application of functionalized calixarenes to the processing of radioactive effluents by supported liquid membranes

    International Nuclear Information System (INIS)

    In a first part, this research thesis presents the general context of nuclear waste processing (nature of wastes to be processed, characteristics of the used method and products), and proposes an overview of results obtained during previous campaigns which were based on the use of the technique of supported liquid membranes, but with other types of extracting components. The second part focuses on the tracking of complexing and extractive properties of all functionalized calixarenes which had been synthesised by different research teams. Several experiments have been performed to determine the extraction efficiency and selectivity of these organic compounds with respect to the studied radio-elements. The third part reports the detailed study of a specific family of functionalized calixarenes for which two thermodynamic models of membrane transport described in the literature have been applied. Validity limits are discussed with respect to operation conditions. Some results are finally given on the caesium and actinide (neptunium, plutonium) decontamination of synthetic concentrates which simulate actual radioactive wastes

  18. Intramolecular hydrogen bonding and calixarene-like structures in p-cresol/formaldehyde resins

    Science.gov (United States)

    Opaprakasit, P.; Scaroni, A.; Painter, P.

    2001-08-01

    The nature of the strong hydrogen bonds found in p-cresol/formaldehyde (PCF) resins, compared to ordinary phenolic compounds, is studied. The evidence from FTIR spectroscopy indicates that this strong interaction is due to intramolecular hydrogen bonding from "calixarene-like" structures. The formation of this structure in PCF is enabled by its "linear" (all- ortho-linkage) structure, which is not present in branched resins. Additionally, a transition is observed at around 175 to 200°C where the intramolecular hydrogen bonded structure is lost. This structure cannot be recovered upon cooling or annealing due to restrictions on conformational rotations that are coupled to a new pattern of intermolecular hydrogen bonding. However, the structure is reformed by dissolving the resin in solution and casting new films.

  19. Study of the simultaneous complexation of a cation and of an anion using functionalized calixarenes; Etude de la complexation simultanee d'un cation et d'un anion par des calixarenes fonctionnalises

    Energy Technology Data Exchange (ETDEWEB)

    Moli, Ch. [CEA Cadarache, Dept. d' Etudes des Dechets, DED, 13 - Saint Paul lez Durance (France)]|[Universite Louis Pasteur, 67 - Strasbourg (France)

    2002-03-01

    The chemical reprocessing of irradiated nuclear fuels leads to the production of high-level radioactive liquid wastes which contain long-lived toxic radioelements. In the framework of the long-term management of these wastes, important research work is carried out for the separation of these radioelements for their further transmutation or immobilization inside specific matrices. These radioelements are present in acid solutions of fission products in the form of cations (cesium), anions (technetium, selenium) and molecules (iodine). Crown calixarenes have been successfully used for the extraction of cesium thanks to their exceptional selectivities. This work is mainly based on the use of the chelating properties of calixarenes for the extraction of anionic radioelements. Calixarenes functionalized by amino-carbon chains have been selected. The synthesis of amine calix[4]arenes and calix[6]arenes is described and their extractive and ionophoretic properties with respect to radioelements are shown using aqueous selective separation techniques like the liquid-liquid extraction and the supported liquid membrane transport. Technetium and selenium are extracted by amine calixarenes from a 10{sup -2} M aqueous solution of nitric acid. At this acidity, no selenium transport is observed, while technetium transport is efficient: the solution is quasi-totally decontaminated in 6 hours. Molecular iodine is efficiently extracted with a simple organic diluent, the 1,2-nitro-phenyl-hexyl-ether, from a strongly concentrated aqueous solution of nitric acid (HNO{sub 3} = 3 M). The transport of iodine becomes faster and more efficient when its concentration in the solution is higher. (J.S.)

  20. Investigation of Basis set Effects on the NMR Chemical Shielding tensors data on (10, 10 SWCNTs Calixarene complexes

    Directory of Open Access Journals (Sweden)

    Roghieh Tarlani Bashiz

    2015-12-01

    Full Text Available Density functional theory calculations (DFT, as well as hybrid methods (B3LYP and HF method for CNT-Calixarene complexes have been carried out to study structural stability. The geometry of the Calixarene has been optimized at DFT methods such as M062x B3LYP and HF methods with 6-31G, 6-31G*and 6-31G** basis sets. According to GIAO method, NMR parameters have been evaluated. The Gaussian quantum chemical package is used for all calculations. The gauge including atomic orbital (GIAO approach was applied for chemical shielding calculations for an isolated calix aren and a complex of Calix-SWCNTs.

  1. Low-generation dendrimers with a calixarene core and based on a chiral C2-symmetric pyrrolidine as iminosugar mimics

    Directory of Open Access Journals (Sweden)

    Marco Marradi

    2012-06-01

    Full Text Available The preparation of low-generation dendrimers based on a simple calix[4]arene scaffold by insertion of the iminosugar-analogue C2-symmetric 3,4-dihydroxypyrrolidine is described. This methodology allows a rapid incorporation of a considerable number of iminosugar-like moieties in a reduced volume and in a well-defined geometry. The inclusion of alkali-metal ions (sodium and potassium in the polar cavity defined by the acetamide moieties at the lower rim of the calixarene was demonstrated, which allows also the rigidification of the dendrimer structure and the iminosugar presentation in the clusters. The combination of the supramolecular properties of calixarenes with the advantage of a dendrimeric presentation of repetitive units opens up the possibility of generating well-defined multivalent and multifaceted systems with more complex and/or biologically relevant iminosugars.

  2. A simple and rapid method for calixarene-based selective extraction of bioactive molecules from natural products.

    Science.gov (United States)

    Segneanu, Adina-Elena; Damian, Daniel; Hulka, Iosif; Grozescu, Ioan; Salifoglou, Athanasios

    2016-03-01

    Natural products derived from medicinal plants have gained an important role in drug discovery due to their complex and abundant composition of secondary metabolites, with their structurally unique molecular components bearing a significant number of stereo-centers exhibiting high specificity linked to biological activity. Usually, the extraction process of natural products involves various techniques targeting separation of a specific class of compounds from a highly complex matrix. Aiding the process entails the use of well-defined and selective molecular extractants with distinctly configured structural attributes. Calixarenes conceivably belong to that class of molecules. They have been studied intensely over the years in an effort to develop new and highly selective receptors for biomolecules. These macrocycles, which display remarkable structural architectures and properties, could help usher a new approach in the efficient separation of specific classes of compounds from complex matrices in natural products. A simple and rapid such extraction method is presented herein, based on host-guest interaction(s) between a calixarene synthetic receptor, 4-tert-butyl-calix[6]arene, and natural biomolecular targets (amino acids and peptides) from Helleborus purpurascens and Viscum album. Advanced physicochemical methods (including GC-MS and chip-based nanoESI-MS analysis) suggest that the molecular structure and specifically the calixarene cavity size are closely linked to the nature of compounds separated. Incorporation of biomolecules and modification of the macrocyclic architecture during separation were probed and confirmed by scanning electronic microscopy and atomic force microscopy. The collective results project calixarene as a promising molecular extractant candidate, facilitating the selective separation of amino acids and peptides from natural products. PMID:26597796

  3. Use of electrospray ionization mass spectrometry for the study of Ln(III) complexation and extraction speciation with calixarene-CMPO in the fuel partitioning concept.

    Science.gov (United States)

    Lamouroux, C; Rateau, S; Moulin, C

    2006-01-01

    The calixarene-bearing CMPO groups belong to a family of extracting agents recently developed for nuclear reprocessing. These molecules exhibit specific properties to separate actinides(III) from lanthanides(III) in nitric acid solution. Speciation of two distinct calixarene-CMPO (carbamoyl phosphine oxide), substituted either in the wide rim or in the narrow rim with lanthanides (La, Eu, Yb), was undertaken. The complexation behaviour in single phase or in liquid-liquid extraction was examined with two different electrospray spectrometer source geometries. The stoichiometries of the different complexes were reported and the selectivity of these calixarenes towards lanthanides was determined. The results obtained were concordant for the two spectrometers and confirm that electrospray mass spectrometry is a useful tool to study non-covalently bonded complexes. PMID:16755616

  4. Use of electro-spray ionization mass spectrometry for the study of Ln(III) complexation and extraction speciation with calixarene-CMPO in the fuel partitioning concept

    International Nuclear Information System (INIS)

    The calixarene-bearing CMPO groups belong to a family of extracting agents recently developed for nuclear reprocessing. These molecules exhibit specific properties to separate actinides(III) from lanthanides(III) in nitric acid solution. Speciation of two distinct calixarene-CMPO (carbamoyl phosphine oxide), substituted either in the wide rim or in the narrow rim with lanthanides (La, Eu, Yb), was undertaken. The complexation behaviour in single phase or in liquid-liquid extraction was examined with two different electro-spray spectrometer source geometries. The stoichiometries of the different complexes were reported and the selectivity of these calixarenes towards lanthanides was determined. The results obtained were concordant for the two spectrometers and confirm that electro-spray mass spectrometry is a useful tool to study non-covalently bonded complexes. (authors)

  5. Extraction of actinides and lanthanides by calixarenes CMPO. Possibility to separate actinides from lanthanides (Calixpart project)

    International Nuclear Information System (INIS)

    The CALIXPART project accepted by the European Community within the framework of the 5 PCRD, relates to the 'selective extraction of minor actinides from H.A. liquid waste by organized matrices'. The objective of this new project is the selective extraction in only one step of minor actinides from a solution of fission products including lanthanides. This separation will be investigated through two strategies: - In the first one, macrocycles will be grafted with ligands containing nitrogen or sulphur which are able to discriminate actinides from lanthanides, but generally present very low distribution coefficients in strongly acidic solutions. Following the example of calixarenes CMPO, the grafting of these ligands on macrocyclic supports should increase the distribution coefficients, and thus allow to use these extractants at nitric acid concentrations up to 3 M. The nitrogen or sulphur ligands are not necessarily selective with respect to the other fission products, and the macrocyclic structure should also afford this necessary selectivity if one wishes to operate in a single step. Once americium and curium separated, the difference in size between both cations is undoubtedly sufficient to make it possible to separate them at the stripping stage. - The second strategy considered is the introduction of two types of ligands (hard and soft) on a macrocyclic structure, the first ensuring the extraction of lanthanides and trivalent actinides, the seconds bringing discrimination between these two groups of cations. (author)

  6. Simulation of cesium nitrate extraction by a calixarene. Application to supported liquid membranes transport

    International Nuclear Information System (INIS)

    This work fits into the general pattern of the CEA studies on the decontamination of liquid effluents containing long-lived radioactive isotopes. Some calixarenes have proved to be very effective to selectively extract the cesium of aqueous solutions whose composition simulates those of the effluents to be reprocessed. On account of the difficulty of the studied extraction mechanisms, a physical and chemical simulation has been necessary. The system takes into account: 1)a concentrated nitric acid aqueous phase and/or sodium nitrate 2)an organic phase constituted by the diluent 1,2-nitro-phenyl-octyl-ether and 1,3-diisopropoxy-calix(4)arene-couronne-6. The use of concentrated aqueous solutions requires to take into account variations to ideality by the mean of activity coefficients reckoning. The different theories on the reckoning of variations to ideality in aqueous or organic phases are described in the first part. The determination of cesium and sodium nitrates activity coefficients in very concentrated matrices has required an important theoretical and experimental study which is given in the second part. The aim of this study was indeed to complete the thermodynamic data of cesium and sodium nitrates aqueous solutions. The computerized tools required for the modeling are reviewed. The stoichiometry of the extracted species in the organic phase has been determined in the third part. The supported membrane technique is an original method of separation by liquid-liquid extraction. A membrane transport model has been developed and is given in the last part of this work. (O.M.)

  7. Electrochemical behavior of folic acid at calixarene based chemically modified electrodes and its determination by adsorptive stripping voltammetry

    Energy Technology Data Exchange (ETDEWEB)

    Vaze, Vishwanath D. [Department of Chemistry, University of Mumbai, Vidyanagari, Santacruz (East), Mumbai 400098 (India); Srivastava, Ashwini K. [Department of Chemistry, University of Mumbai, Vidyanagari, Santacruz (East), Mumbai 400098 (India)], E-mail: aksrivastava@chem.mu.ac.in

    2007-12-31

    Voltammetric behavior of folic acid at plain carbon paste electrode and electrode modified with calixarenes has been studied. Two peaks for irreversible oxidation were observed. Out of the three calixarenes chosen for modification of the electrodes, p-tert-butyl-calix[6]arene modified electrode (CME-6) was found to have better sensitivity for folic acid. Chronocoulometric and differential pulse voltammetric studies reveal that folic acid can assemble at CME-6 to form a monolayer whose electron transfer rate is 0.00273 s{sup -1} with 2-electron/2-proton transfer for the peak at +0.71 V against SCE. An adsorption equilibrium constant of 5 x 10{sup 3} l/mol for maximum surface coverage of 2.89 x 10{sup -10} mol/cm{sup 2} was obtained. The current is found to be rectilinear with concentration by differential pulse voltammetry. However, linearity in the lower range of concentration 8.79 x 10{sup -12} M to 1.93 x 10{sup -9} M with correlation coefficient of 0.9920 was achieved by adsorptive stripping voltammetry. The limit of detection obtained was found to be 1.24 x 10{sup -12} M. This method was used for the determination of folic acid in a variety of samples, viz. serum, asparagus, spinach, oranges and multivitamin preparations.

  8. Calixarene receptors in the selective separation of alachlor. Characterization of the separated complexes; Receptores calixarenicos en la separacion selectiva de alaclor. Caracterizacion de los complejos separados

    Energy Technology Data Exchange (ETDEWEB)

    Garcia G, M.C

    2004-07-01

    Pesticides have been necessary in the agriculture since the plagues control have been remedied thanks to them but it has also provoked pollution. Nowadays, there are several methods which help to decrease or remedy such a pollution provoked. Unfortunately, any of them work out the environmental problem totally. Therefore, alternatives have to be found. The organic and tri dimensional characteristics of these macrocycles afford them a high versatility in such a way that these hosts can interact with organic guests selectively. Alachlor is a chlorinated organic herbicide useful in the plagues control of annual grasses and many broad-leave weeds which grow in maize, peanuts and soyabean. The ability of calixarenes to host organic guests with chemical characteristics similar to pesticides let them to be good candidates to compete with others methods which are used presently to separate organic pesticides. In this direction one of the advantages of proposing the use of calixarenes is, its facility of being modified in the lower and/or upper rims, to adapt them to aqueous, organic, gaseous and aqueous-organic media. Once the characteristics of reagents informed in the literature were confirmed and complemented with others found in this work, we studied, in solution, the interaction of the calixarenes with alachlor using 1 x 10{sup -5} to 1 x 10{sup -3} M solutions in acetonitrile for calixarenes fitted with phosphinoyl pendant arms in the lower rim, B{sub n}bL{sup n}, n= 4, 6) and in chloroform for parents calixarenes (H{sub n}bL{sup n} n = 4, 6, 8). Meticulous studies monitored by UV-Vis and luminescence were carried out, and the best stoichiometry to be used in further studies resulted to be 1(host): 1(alachlor). Therefore, we chose the 1 x 10{sup -4} M concentration to find how long the host-guest should be interacting in order to guarantee the formation in solution of the calixarene-alachlor species. It was found 168 h for the alachlor-B{sub n}bL{sup n} interaction

  9. Two novel calixarene functionalized iron oxide magnetite nanoparticles as a platform for magnetic separation in the liquid–liquid/solid–liquid extraction of oxyanions

    International Nuclear Information System (INIS)

    This article focuses on the syntheses of 25,27-bis[3-(N-ethylsulfonic acid)aminopropxy]-26,28-dihydroxy-5,11,17,23-tetra-tert-butyl-calix[4]arene (3) and 25,27-bis[3-(N-ethyl-dihydrogen phosphate)aminopropxy]-26,28-dihydroxy-5,11,17,23-tetra-tert-butyl-calix[4] arene (4) as well as their immobilization onto [3-(2,3-epoxypropoxy)-propyl]-trimethoxysilane-modified Fe3O4 magnetite nanoparticles, and the extraction abilities of four new extractants which were characterized by a combination of FTIR, 1H NMR, elemental analyses, transmission electron microscopy (TEM) and thermogravimetric analyses (TGA) involving electrostatic and hydrogen bonding interactions between the calixarene and oxide anions such as arsenate and dichromate anions. The extraction results indicate that these new calixarene derivatives having high extraction capabilities would be used as effective extractants for the removal of the dichromate/arsenate ions from water. - Highlights: ► Two novel calix[4]arene appended magnetic nanoparticles have been synthesized. ► Calixarene-grafted magnetic nanoparticles are becoming a hot topic. ► Long-term exposure to As(V)/Cr(VI) contaminated water causes various types of cancers. ► Clx-MNs have been effectively used for the extraction of toxic oxyanions. ► Two novel calix[4]arene appended magnetic nanoparticles have been synthesized

  10. A study on synergistic effects and protonation of a selected calixarene based picolinamide ligand used in the An/Ln separation

    International Nuclear Information System (INIS)

    A series of liquid-liquid extraction tests was performed on the ligand hexakis(3-N-picoline-amidepropyloxy)calix[6]arene (PAR4). First, a screening campaign was carried out, in order to select the best organic solvent to be coupled to the aforementioned calixarene ligand. 2-Nitrophenyl hexyl ether (NPHE) was chosen to this purpose, and it was used in all the subsequent experiments, because of its excellent properties from both the viewpoints of calixarene solubility and ligand extracting capabilities. In solvent extraction tests, 241Am was used as representative of minor actinides, while 152Eu was employed to simulate lanthanides. Distribution coefficients and separation factors were obtained via gamma spectrometry. In addition, the synergism between the ligand and the lipophilic dicarbollide anion Cesium commo-3,3-cobalta-Bis(8,9,12 tribromo-1,2 dicarba-closo-Dodecarborane)ate(1-) (Br-Cosan) was investigated. Experimental results indicate that at pH 3 2 a strong synergistic effect between the calixarene ligand and Br-Cosan takes place. At higher acidity, on the other hand, the ligand protonation dramatically affects the efficiency and selectivity of the system. (author)

  11. p-tert-Butylcalix[4]arene complexes of molybdenum and tungsten: reactivity of the calixarene methylene C-H bond and the facile migration of the metal around the phenolic rim of the calixarene.

    Science.gov (United States)

    Buccella, Daniela; Parkin, Gerard

    2006-12-20

    p-tert-Butylcalix[4]arene, [CalixBut(OH)4], reacts with Mo(PMe3)6 and W(PMe3)4(eta2-CH2PMe2)H to yield compounds of composition {[CalixBut(OH)2(O)2]M(PMe3)3H2} which exhibit unprecedented use of a C-H bond of a calixarene methylene group as a binding functionality in the form of agostic and alkyl hydride derivatives. Thus, X-ray diffraction studies demonstrate that, in the solid state, the molybdenum complex [CalixBut(OH)2(O)2]Mo(PMe3)3H2 exists as an agostic derivative with a Mo...H-C interaction, whereas the tungsten complex exists as a metallated trihydride [Calix-HBut(OH)2(O)2]W(PMe3)3H3. Solution 1H NMR spectroscopic studies, however, provide evidence that [Calix-HBut(OH)2(O)2]W(PMe3)3H3 is in equilibrium with its agostic isomer [CalixBut(OH)2(O)2]W(PMe3)3H2. Dynamic NMR spectroscopy also indicates that the [M(PMe3)3H2] fragments of both the molybdenum and tungsten complexes [CalixBut(OH)2(O)2]M(PMe3)3H2 migrate rapidly around the phenolic rim of the calixarene on the NMR time scale, an observation that is in accord with incorporation of deuterium into the methylene endo positions upon treatment of the isomeric mixture of [CalixBut(OH)2(O)2]W(PMe3)3H2 and [Calix-HBut(OH)2(O)2]W(PMe3)3H3 with D2. Treatment of {[CalixBut(OH)2(O)2]W(PMe3)3H2} with Ph2C2 gives the alkylidene complex [CalixBut(O)4]W=C(Ph)Ar [Ar = PhCC(Ph)CH2Ph]. PMID:17165791

  12. Study of in vitro toxicity and ex vivo and in vivo efficiency of calixarene galenic forms developed for the treatment of cutaneous contamination due to uranium compounds

    International Nuclear Information System (INIS)

    In case of radiological skin contamination by uranium compounds, the only treatments currently available consist in rinsing the contaminated skin area with water and detergent, or with a calcium salt of diethylene triamine pentaacetic acid (Ca-DTPA) solution. However, these procedures are not specific and no efficient treatment for cutaneous contamination due to uranium exists. In the absence of such treatments, uranium diffusion through the skin is fast, inducing an internal exposure after its distribution inside the body through the bloodstream. One part of the bioavailable uranium is up-taken in target organs which are the kidneys and the skeleton, where its toxic effects occur. Therefore a topical formulation consisting of an oil-in-water nano-emulsion incorporating a tricarboxylic calixarene molecule, as a specific chelating agent for uranium, was previously developed. The work achieved in this thesis aimed at evaluating the ex vivo and in vivo decontamination efficiency of this new emergency treatment on intact and superficially wounded skin. For this purpose, skin excoriation model was used. Reproducible models of superficial wounds consisting of micro-cuts and micro-punctures were also developed in order to evaluate the efficiency of the nano-emulsion on physical wounds such as incisions. These studies showed that the calixarene nano-emulsion could be an efficient decontaminating treatment, less aggressive than using the current treatment: soaped water. Its potential cutaneous toxicity was evaluated on in vitro reconstructed human epidermis using three different toxicity tests (MTT, LDH and IL-1-α). These studies demonstrated that the calixarene nano-emulsion did not induce skin toxicity even after 24 h of exposure time. (author)

  13. Carboxylated calixarenes bind strongly to CD69 and protect CD69+ killer cells from suicidal cell death induced by tumor cell surface ligands

    Czech Academy of Sciences Publication Activity Database

    Bezouška, K.; Šnajdrová, R.; Křenek, K.; Vančurová, Markéta; Kádek, A.; Adámek, D.; Lhoták, P.; Kavan, Daniel; Hofbauerová, Kateřina; Man, Petr; Bojarová, Pavla; Křen, Vladimír

    2010-01-01

    Roč. 18, č. 4 (2010), s. 1434-1440. ISSN 0968-0896 R&D Projects: GA MŠk OC 136; GA MŠk 1M0505; GA ČR GA303/09/0477; GA ČR GD305/09/H008; GA AV ČR IAA400200503; GA AV ČR KJB500200612 Institutional research plan: CEZ:AV0Z50200510 Keywords : Carboxylated calixarenes * Lymphocyte activation * Receptor cross-linking Subject RIV: CE - Biochemistry Impact factor: 2.978, year: 2010

  14. Simulation of cesium nitrate extraction by a calixarene. Application to supported liquid membranes transport; Modelisation de l`extraction du nitrate de cesium par un calixarene. Application a la modelisation du transport a travers des membranes liquides supportees

    Energy Technology Data Exchange (ETDEWEB)

    Sorel, C.

    1996-12-12

    This work fits into the general pattern of the CEA studies on the decontamination of liquid effluents containing long-lived radioactive isotopes. Some calixarenes have proved to be very effective to selectively extract the cesium of aqueous solutions whose composition simulates those of the effluents to be reprocessed. On account of the difficulty of the studied extraction mechanisms, a physical and chemical simulation has been necessary. The system takes into account: 1)a concentrated nitric acid aqueous phase and/or sodium nitrate 2)an organic phase constituted by the diluent 1,2-nitro-phenyl-octyl-ether and 1,3-diisopropoxy-calix(4)arene-couronne-6. The use of concentrated aqueous solutions requires to take into account variations to ideality by the mean of activity coefficients reckoning. The different theories on the reckoning of variations to ideality in aqueous or organic phases are described in the first part. The determination of cesium and sodium nitrates activity coefficients in very concentrated matrices has required an important theoretical and experimental study which is given in the second part. The aim of this study was indeed to complete the thermodynamic data of cesium and sodium nitrates aqueous solutions. The computerized tools required for the modeling are reviewed. The stoichiometry of the extracted species in the organic phase has been determined in the third part. The supported membrane technique is an original method of separation by liquid-liquid extraction. A membrane transport model has been developed and is given in the last part of this work. (O.M.). 128 refs.

  15. Alkaline-Side Extraction of Cesium from Savannah River Tank Waste Using a Calixarene-Crown Ether Extractant

    Energy Technology Data Exchange (ETDEWEB)

    Bonnesen, P.V.; Delmau, L.H.; Haverlock, T.J.; Moyer, B.A.

    1998-12-01

    Results are presented supporting the viability of the alkaline-side CSEX process as a potential replacement for the In-Tank Precipitation process for removal of cesium from aqueous high-level waste (HLW) at the Savannah River Site (SRS). Under funding from the USDOE Efficient Separations and Crosscutting program, a flowsheet was suggested in early June of 1998, and in the following four months, this flowsheet underwent extensive testing, both in batch tests at ORNL and ANL and in two centrifugal-contactor tests at ANL. To carry out these tests, the initial ESP funding was augmented by direct funds from Westinghouse Savannah River Corporation. The flowsheet employed a solvent containing a calixarene-crown hybrid compound called BoBCalixC6 that was invented at ORNL and can now be obtained commercially for government use from IBC Advanced Technologies. This special extractant is so powerful and selective that it can be used at only 0.01 M, compensating for its expense, but a modifier is required for use in an aliphatic diluent, primarily to increase the cesium distribution ratio D{sub Cs} in extraction. The modifier selected is a relatively economical fluorinated alcohol called Cs3, invented at ORNL and so far available. only from ORNL. For the flowsheet, the modifier is used at 0.2 M in the branched aliphatic kerosene Isopar{reg_sign} L. Testing at ORNL and ANL involved simulants of the SRS HLW. After extraction of the Cs from the waste simulant, the solvent is scrubbed with 0.05 M HNO{sub 3} and stripped with a solution comprised of 0.0005 M HNO{sub 3} and 0.0001 M CsNO{sub 3}. The selection of these conditions is justified in this report, both on the basis of experimental data and underlying theory.

  16. The effect of "on/off" molecular switching on the photophysical and photochemical properties of axially calixarene substituted activatable silicon(iv)phthalocyanine photosensitizers.

    Science.gov (United States)

    Güngör, Ömer; Altınbaş Özpınar, Gül; Durmuş, Mahmut; Ahsen, Vefa

    2016-05-01

    Silicon(iv) phthalocyanines ( and ) bearing two calixarene groups as axial ligands were synthesized. Surprisingly, both phthalocyanines were obtained as two different isomers ( and ) depending on the distance between calixarene benzene groups and the phthalocyanine ring. DFT and TD-DFT computations were performed to model plausible structures of these isomers and to simulate electronic absorption spectra. These isomers converted into each other depending on the polarity of the used solvent, temperature and light irradiation. The photophysical and photochemical properties of each isomer were investigated in dimethylsulfoxide (DMSO) for the determination of photodynamic therapy (PDT) activities of these compounds. The more blue-shifted isomers ( and ) showed higher fluorescence quantum yields and singlet oxygen generation compared to more red-shifted counterparts ( and ). This behavior is extremely important for developing activatable photosensitizers for cancer treatment by PDT. Although these photosensitizers produce lower singlet oxygen in normal cells, they produce higher singlet oxygen (six times higher for ) in cancer cells since these photosensitizers converted to more blue-shifted isomers by using light irradiation. PMID:27052992

  17. Cyclodextrin- and calixarene-based polycationic amphiphiles as gene delivery systems: a structure-activity relationship study.

    Science.gov (United States)

    Gallego-Yerga, Laura; Lomazzi, Michela; Franceschi, Valentina; Sansone, Francesco; Ortiz Mellet, Carmen; Donofrio, Gaetano; Casnati, Alessandro; García Fernández, José M

    2015-02-14

    Multi-head/multi-tail facial amphiphiles built on cyclodextrin (CD) and calixarene (CA) scaffolds are paradigmatic examples of monodisperse gene delivery systems. The possibility to precisely control the architectural features at the molecular level offers unprecedented opportunities for conducting structure-activity relationship studies. A major requirement for those channels is the design of a sufficiently diverse ensemble of compounds for parallel evaluation of their capabilities to condense DNA into transfection nanoparticles where the gene material is protected from the environment. Here we have undertaken the preparation of an oriented library of β-cyclodextrin (βCD) and calix[4]arene (CA4) vectors with facial amphiphilic character designed to ascertain the effect of the cationic head nature (aminothiourea-, arginine- or guanidine-type groups) and the macrocyclic platform on the abilities to complex plasmid DNA (pDNA) and in the efficiency of the resulting nanocomplexes to transfect cells in vitro. The hydrophobic domain, formed by hexanoyl or hexyl chains, remains constant in each series, matching the overall structure found to be optimal in previous studies. DLS, TEM and AFM data support that all the compounds self-assemble in the presence of pDNA through a process that involves initially electrostatic interactions followed by formation of βCD or CA4 bilayers between the oligonucleotide filaments. Spherical transfectious nanoparticles that are monomolecular in DNA are thus obtained. Evaluation in epithelial COS-7 and human rhabdomyosarcoma RD-4 cells evidenced the importance of having primary amino groups in the vector to warrant high levels of transfection, probably because of their buffering capacity. The results indicate that the optimal cationic head depends on the macrocyclic core, aminothiourea groups being preferred in the βCD series and arginine groups in the CA4 series. Whereas the transfection efficiency relationships remain essentially

  18. Formation of dot arrays with a pitch of 20 nm x 20 nm for patterned media using 30 keV EB drawing on thin calixarene resist

    Energy Technology Data Exchange (ETDEWEB)

    Mohamad, Zulfakri bin [Department of Nano-Material System, Graduate School of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515 (Japan); Shirai, Masumi [Department of Nano-Material System, Graduate School of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515 (Japan); Sone, Hayato [Department of Production Science and Technology, Graduate School of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515 (Japan); Hosaka, Sumio [Department of Production Science and Technology, Graduate School of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515 (Japan); Kodera, Masatoshi [Department of Electronics, Information and Communication Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585 (Japan)

    2008-01-16

    We studied the possibility of achieving very fine-pitch dot arrays with a pitch of 20 nm x 20 nm using 30 keV electron beam (EB) drawing on negative calixarene resist. In order to form such patterns, we studied the dependence on resist thickness of the dot size and the packing. We propose EB drawing on an extremely thin film for very highly packed dot-array formation. Our experimental results demonstrate the possibility of forming highly packed dot-array patterns with a pitch of 20 nm x 20 nm and a resist thickness of about 13 nm, which corresponds to about 1.6 Tbits in{sup -2}.

  19. Thermodynamic modelling of lanthanides nitrates extraction by CMPO and by a calixarene-CMPO in concentrated nitric acid. Application to the optimization of lanthanides and lanthanides/actinides separation

    International Nuclear Information System (INIS)

    Former studies have shown that calixarenes functionalized by four CMPO units have a better affinity for actinides than for lanthanides. In order to optimize the experimental conditions of separation and take into account the divergences between the ideality of concentrated nitric solutions, we have adopted a thermodynamic approach. The methodology used for determining the number and the stoichiometry of the complexes formed in organic phase is based on the MIKULIN-SERGIEVSKII model carried out by a software of mathematical data treatment of experimental extraction isotherms. These tools are at first exploited on an extraction system including CMPO, extracting reagent of actinides and lanthanides in a concentrated nitric medium. This study on a system already well documented allows to appreciate the performances of our approach. The modelling of the Ln(NO3)3-HNO3-H2O/CMPO system proves the results of several studies. The modelling results obtained with CMPO allow to establish simplifying work hypotheses aiming to limit the investigations of our researches towards the more stable complexes formed between lanthanides and a calixarene functionalized by four CMPO units. An analytical expression of the separation selectivity by a calixarene is established for revealing the parameters and the physico-chemical variables from which it depends. Then, it is mainly the ratio between the effective extraction constants and the water activity value of the system which determine the separation selectivity of the two elements. The utilization of this relation allows to estimate the influence of a nitric acid concentration variation on the separation selectivity. Liquid-liquid extraction experiments strengthen these estimations and inform on the affinity of calixarene towards lanthanides and americium. (O.M.)

  20. On-cartridge derivatisation using a calixarene solid-phase extraction sorbent for facile, sensitive and fast determination of formaldehyde in beer.

    Science.gov (United States)

    Deng, Zhifen; Hu, Kai; Zhang, Yongming; Zhao, Wenjie; Wang, Fei; Guo, Ling; Zhang, Wenfen; He, Juan; Huang, Yanjie; Zhang, Shusheng

    2016-11-15

    This work demonstrates the successful application of an on-cartridge derivatisation procedure for facile, fast and sensitive determination of formaldehyde in beer by HPLC-UV. The derivatisation and solid-phase extraction (SPE) were integrated into a novel calixarene SPE sorbent: tetraazacalix[2]arene[2]triazine bonded silica gel. Specifically, 2,4-dinitrophenylhydrazine was adsorbed onto the sorbent in advance, based on the charge-transfer interaction between the macrocyclic molecule and nitrobenzenes. The method was optimised and validated: under the optimal conditions of derivatisation, SPE and HPLC separation, good linearity was obtained in the range of 0.080-3.2μgmL(-1) with a correlation coefficient of 0.9939, the limit of detection was 3.0ngmL(-1) (S/N=3), the limit of quantification was 10ngmL(-1) (S/N=10), and the recovery level using this method was desirable at 75-84%. The developed method was successfully applied to determine formaldehyde content in real beer samples; the results were in the range of 0.11-1.1μgmL(-1). PMID:27283638

  1. Thermodynamic modelling of the extraction of nitrates of lanthanides by CMPO and by CMPO-like calixarene in concentrated nitric acid medium. Application in the optimization of the separation of lanthanides and actinides/lanthanides

    International Nuclear Information System (INIS)

    The separation minor actinides / lanthanides in nitric acid medium is as one of problems of separative chemistry the most delicate within the framework of the processes allowing the recovery of long life radioelements present in the solutions of fission products. Previous studies showed that CMPO-substituted calix[4]arenes presents a better affinity for actinides than for lanthanides. To optimize the operating conditions of separation and to take into account the degree of non-ideality for the concentrated nitric solutions, we adopted a thermodynamic approach. The methodology taken to determine the number and the stoichiometry of the complexes formed in organic phase base on MIKULIN-SERGIEVSKII's model used through a software of data processing of experimental extraction isotherms. These tools are exploited at first on an extraction system engaging the CMPO, extractant reagent of actinides and lanthanides in concentrated nitric medium. The modelling of the system Ln(NO3)3-HNO3-H2O/CMPO comes to confirm the results of several studies. At the same time, they allow to establish working hypotheses aiming at limiting the investigations of our researches towards the most stable complexes formed between lanthanides and CMPO-like calixarene to which the same method is then applied. An analytical expression of the selectivity of separation by the calixarene is established to determine the parameters and physico-chemical variables on which it depends. So, the ratio of the constants of extraction and the value of the activity of water of the system fixes the selectivity of separation of 2 elements. The exploitation of this relation allows to preview the influence of a variation of the concentration of nitric acid. Experiments of extraction confirm these forecasts and inform about the affinity of the calixarene with respect to lanthanides elements and to the americium. (author)

  2. Synthesis and catalytic property of 1,3-butadiene of calixarene neodynium complex%杯芳烃钕配合物的合成及其催化丁二烯聚合

    Institute of Scientific and Technical Information of China (English)

    倪旭峰; 张一烽; 沈之荃; 陶骏

    2001-01-01

    Three kinds of calixarene neodynium complexes(C[4]NdCl,C[6]NdCl,C[8]Nd2Cl2) were synthesized. Polymerization of 1,3-butadiene with binary catalytic systems composed of calixarene neodynium/triisobutyl-aluminum and ternary catalytic system composed of calixarene neodynium, triisobutyl-aluminum, and a Lewis acid (Al2Et3Cl3 or Al(i-Bu)2Cl or PhCH2Cl) as the third component was studied. The binary catalysts were found to be active even in the absence of halogen source, the sequence of catalytic activity of calixarene neodynium complexes is C[8]Nd2Cl2>C[6]NdCl>C[4]NdCl. While the ternary system has higher activity especially using Al2Et3Cl3.as the third component, and the polymer obtained has higher cis-1,4 content. The effect of chloride sort and catalyst preparation mode, Cl/Nd ratio, and the reaction temperature on polymerization and polymer microstructure of ternary system use C[8]Nd2Cl2 was investigated. It was found that when Al2Et3Cl3 as the third component and Cl/Nd=1, the catalytic system has highest activity to polymerization of 1,3-butadiene. The cis-1,4 content of polybutadiene is decreased with the increase of reaction temperature. High cis-polybutadiene(96%) formed when polymerization was carried out at 5 ℃.%首次应用新型配体——杯芳烃.钕配合物与三异丁基铝构成催化体系催化丁二烯聚合。研究发现杯[6,8]芳烃钕/Al(i-Bu)3/汽油体系中,当Al/Nd=40~100,50℃时具有中等催化聚合活性,所制得聚丁二烯的粘均分子量为10~20万,顺-1,4结构含量为89%左右。添加适量Al2Et3Cl3,或Al(i-Bu)2Cl能提高催化活性。但不能提高顺-1,4结构含量。降低聚合反应温度,5℃聚合所得产物的顺-1,4结构含量可达96%。

  3. Thermodynamic modelling of the extraction of nitrates of lanthanides by CMPO and by CMPO-like calixarene in concentrated nitric acid medium. Application in the optimization of the separation of lanthanides and actinides/lanthanides; Modelisation thermodynamique de l'extraction de nitrates de lanthanides par le CMPO et par un calixarene-CMPO en milieu acide nitrique concentre. Application a l'optimisation de la separation des lanthanides et des actinides/lanthanides

    Energy Technology Data Exchange (ETDEWEB)

    Belair, S

    2003-07-01

    The separation minor actinides / lanthanides in nitric acid medium is as one of problems of separative chemistry the most delicate within the framework of the processes allowing the recovery of long life radioelements present in the solutions of fission products. Previous studies showed that CMPO-substituted calix[4]arenes presents a better affinity for actinides than for lanthanides. To optimize the operating conditions of separation and to take into account the degree of non-ideality for the concentrated nitric solutions, we adopted a thermodynamic approach. The methodology taken to determine the number and the stoichiometry of the complexes formed in organic phase base on MIKULIN-SERGIEVSKII's model used through a software of data processing of experimental extraction isotherms. These tools are exploited at first on an extraction system engaging the CMPO, extractant reagent of actinides and lanthanides in concentrated nitric medium. The modelling of the system Ln(NO{sub 3}){sub 3}-HNO{sub 3}-H{sub 2}O/CMPO comes to confirm the results of several studies. At the same time, they allow to establish working hypotheses aiming at limiting the investigations of our researches towards the most stable complexes formed between lanthanides and CMPO-like calixarene to which the same method is then applied. An analytical expression of the selectivity of separation by the calixarene is established to determine the parameters and physico-chemical variables on which it depends. So, the ratio of the constants of extraction and the value of the activity of water of the system fixes the selectivity of separation of 2 elements. The exploitation of this relation allows to preview the influence of a variation of the concentration of nitric acid. Experiments of extraction confirm these forecasts and inform about the affinity of the calixarene with respect to lanthanides elements and to the americium. (author)

  4. Modeling a calixarene-crown-6 and its alkali complexes by means of a hybrid quantum mechanical/molecular mechanical method

    International Nuclear Information System (INIS)

    Calixarene-crown-6s in 1,3-alternate conformation are compounds currently investigated for their ability to selectively extract traces of cesium from acidic or strong salinity aqueous solutions. Studies based on molecular modeling were undertaken on these systems to understand their behavior regarding cesium and other alkali cations, in particular sodium. In this work, a recently developed molecular modeling approach was used to investigate calixarene BC6 and its alkali complexes. The whole calixarene ligand is treated by the semiempirical AM1 quantum method (QM) whereas the cation and solvent are treated by a conventional force field (MM). The total energy of the system is the sum of the QM and MM sub-system contributions plus the QM/MM interaction energy. The latter includes the electrostatic interaction between QM charges (nuclei + electrons) and MM sites, and the non-electrostatic QM/MM van der Weals term, usually expressed by a Lennard-Jones potential. In the QM/MM method, van der Waals interactions between the QM and MM sub-systems are described by empirical Lennard-Jones parameters which must be adapted to the hybrid potential considered. Parameters on oxygen atoms were optimized. For the cations, two sets of Parameters were tested: Aqvist empirical parameters, derived to represent cation/water interactions in classical dynamics (set 2), and a new set of parameters which we calculated from dispersion coefficients available in the literature (set 1). The latter gave better results for the interactions with the crown. In the sodium complex, the cation interacts with only four oxygen atoms of the crown, whereas in the complex with cesium, the interaction involves six oxygen atoms. Distortion of the BC6 is therefore less with sodium and favors the corresponding complex by 4 kcal/mol. The cation/BC6 van der Waals energy is very weak for the two complexes. Hence the interaction between the cation and BC6 is primarily electrostatic. The BC6 polarization energy due

  5. Mononuclear and dinuclear molybdenum and tungsten complexes of p-tert-butyltetrathiacalix[4]arene and p-tert-butyltetrasulfonylcalix[4]arene: facile cleavage of the calixarene ligand framework by nickel.

    Science.gov (United States)

    Buccella, Daniela; Parkin, Gerard

    2008-07-01

    The reactivity of p-tert-butyltetrathiacalix[4]arene, [S4CalixBut(OH)4], and p-tert-butyltetrasulfonylcalix[4]arene, [(SO2)4CalixBut(OH)4], toward Mo(PMe3)5H2, Mo(PMe3)6, and W(PMe3)4(eta2-CH2PMe2)H has been used to synthesize a series of mononuclear molybdenum and tungsten calixarene compounds that feature both coordinatively saturated and unsaturated metal centers, such as [S4CalixBut(OH)2(O)2]M(PMe3)3H2 (M = Mo, W), [(SO2)4CalixBut(OH)2(O)2]M(PMe3)3H2, [S4CalixBut(OH)2(O)2]Mo(PMe3)3, [(SO2)4CalixBut(OH)2(O)2]Mo(PMe3)3, and [(SO2)4CalixBut(OH)(O)3]M(PMe3)3H. Comparison with the related {[CalixBut(OH)2(O)2]M} complexes indicates that the chemistry of the system is strongly influenced by the nature of the calixarene linker, that is, CH2, S, and SO2. For example, in contrast to the methylene-bridged calixarene system, the thiacalixarene and sulfonylcalixarene systems readily coordinate a second metal center to form homo- and heterodinuclear complexes, namely {[S4CalixBut(O)4]}[M(PMe3)3H2]2, {[(SO2)4CalixBut(O)4]}[Mo(PMe3)3H2]2 and {[S4CalixBut(O)4]}[Mo(PMe3)3H2][W(PMe3)3H2]. Of most interest, incorporation of nickel into [S4CalixBut(OH)2(O)2]M(PMe3)3H2 using Ni(PMe3)4 results in cleavage of a C- bond to give [(SArButOH)(SArButO)3][M(PMe3)3H2][Ni(PMe3)2], an observation that is of relevance to the role that nickel plays in hydrodesulfurization catalysis. PMID:18557612

  6. Structural study of the uranyl and rare earth complexation functionalized by the CMPO; Etude structurale de la complexation de l'uranyle et des ions lanthanides par des calixarenes fonctionnalises par le CMPO

    Energy Technology Data Exchange (ETDEWEB)

    Cherfa, S

    1998-12-10

    In view of reducing the volume of nuclear waste solutions, a possible way is to extract simultaneously actinide and lanthanide ions prior to their ulterior separation.. Historically, the two extractant families used for nuclear waste reprocessing are the phosphine oxides and the CMPO (Carbamoyl Methyl Phosphine Oxide). For a better understanding of the complexes formed during extraction, we undertook structural studies of the complexes formed between uranyl and lanthanide (III) ions and the two classes of ligands cited above. These studies have been performed by X-ray diffraction on single crystals. Recently, a new type of extractants of lanthanide (III) and actinide (III) ions has been developed. When the Organic macrocycle called calixarene (an oligomeric compound resulting from the poly-condensation of phenolic units) is functionalized by a CMPO ligand, the extracting power, in terms of yield and selectivity towards lightest lanthanides, is greatly enhanced compared to the one measured for the single CMPO. Our X-ray diffraction studies allowed us to characterise, in terms of stoichiometry and monodentate or bidentate coordination mode of the CMPO functions, the complexes of calix[4]arene-CMPO (with four phenolic units) with lanthanide nitrates and uranyl. These different steps of characterisation enabled us to determine the correlation between the structures of the complexes and both selectivity and exacerbation of the extracting power measured in the liquid phase. (author)

  7. Lanthanide ion complexes of calixarenes. Pt. VII

    International Nuclear Information System (INIS)

    Reaction of Ln(ClO4)3.xdmso (dmso denotes dimethyl sulfoxide) with a warm p-t-butylcalix[8]arene (L) slurry in acetone/dmso yields crystalline 2:1 Ln/ligand adducts, characterized as dmso solvates and established to be [Ln2(L-6H)(dmso)5].∼2dmso by single-crystal X-ray studies at c. 295 K for Ln = La, Eu, Tm and Lu. All complexes are isomorphous, orthorhombic with a similar complex molecule in each case, one half comprising the asymmetric unit; the second half is generated by a crystallographic twofold axis. The two lanthanide atoms are encompassed by the macrocycle and are eight coordinate, involving phenolic and dmso O-donor atoms, five of the former (two bridging) and three of the latter (one bridging). The array closely resembles that found in analogous dmf solvent adducts: the bridging dmso lies on the crystallographic twofold axis through the complex, its peripheral atoms being modelled by disorder. 25 refs., 3 tabs., 1 fig

  8. Porphyrin/calixarene self-assemblies in aqueous solution

    Czech Academy of Sciences Publication Activity Database

    Kubát, Pavel; Lang, Kamil; Lhoták, P.; Janda, Pavel; Sýkora, Jan; Matějíček, P.; Hof, Martin; Procházka, K.; Zelinger, Zdeněk

    2008-01-01

    Roč. 198, č. 1 (2008), s. 18-25. ISSN 1010-6030 R&D Projects: GA ČR GA203/07/1424; GA ČR(CZ) GA203/06/1244; GA AV ČR KAN100500652; GA MŠk(CZ) LC06063 Institutional research plan: CEZ:AV0Z40400503; CEZ:AV0Z40320502 Keywords : cationic porphyrin * calix[4]arene * thiacalix[4]arene Subject RIV: CF - Physical ; Theoretical Chemistry Impact factor: 2.362, year: 2008

  9. Review on calixarene-type macrocycles and metal extraction data

    Energy Technology Data Exchange (ETDEWEB)

    Ludwig, R. [Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment

    1995-12-01

    This paper gives an overview on the current state of solvent extraction studies with derivatized [1.n]-metacyclophanes and related compounds. 122 References from the last ten years are discussed and data on extractability, extraction equilibria, and complex formation are presented in graphical form. (author) 122 refs.

  10. Selective extraction of actinides by calixarenes: application to bioassay analysis

    International Nuclear Information System (INIS)

    In the context of nuclear workers monitoring, the aim of this PhD was to selectively isolate U, Pu, and Am from urine to propose a new analytical procedure to the Medical and Biology Analysis Laboratories. The 1,3,5-OCH3-2,4,6-OCH2CONHOH-p-tert-butyl-calix[6]arene molecule has been selected as a promising extractant for U, Pu, and Am. Its physico-chemical properties and its affinity for UO22+ have been studied through two approaches, one theoretical (molecular modelling at DFT level), and one experimental. The extractions of the three actinides by the hydroxamic calix[6]arene were quantitative in liquid-liquid and solid-liquid systems. Their separation has also been shown possible and efficient. After optimization, the proposed procedure should allow the laboratories to carry out the chemical treatment of urine, before the measurement, in one day instead of the three days needed nowadays. (author)

  11. Clinical applications of calixarene based sodium-selective electrodes

    OpenAIRE

    Walsh, Suzanne

    1997-01-01

    Since their beginnings in the late 1960's ion-selective electrodes have rapidly become one of the most important types of chemical sensor. They are commercially available for a large variety of ions, are widely used and have been characterised thoroughly by many investigators. Having attained this level of sophistication, research in this area today is often directed towards novel applications of such sensors. This thesis represents a study of certain clinical applications of sodium-selective...

  12. Meta-arylation of calixarenes using organomercurial chemistry

    Czech Academy of Sciences Publication Activity Database

    Slavík, P.; Flídrová, K.; Dvořáková, H.; Eigner, Václav; Lhoták, P.

    2013-01-01

    Roč. 11, č. 33 (2013), s. 5528-5534. ISSN 1477-0520 Grant ostatní: AV ČR(CZ) Praemium Academiae Institutional support: RVO:68378271 Keywords : calix[4]arenes * mercuration * meta-substitution * supramolecular chemistry * jana2006 Subject RIV: CC - Organic Chemistry Impact factor: 3.487, year: 2013

  13. Review on calixarene-type macrocycles and metal extraction data

    International Nuclear Information System (INIS)

    This paper gives an overview on the current state of solvent extraction studies with derivatized [1.n]-metacyclophanes and related compounds. 122 References from the last ten years are discussed and data on extractability, extraction equilibria, and complex formation are presented in graphical form. (author) 122 refs

  14. Selective extraction of actinides by calixarenes: application to bioassay analysis; Extraction selective des actinides par les calixarenes: application a l'analyse radiotoxicologique

    Energy Technology Data Exchange (ETDEWEB)

    Boulet, B

    2006-01-15

    In the context of nuclear workers monitoring, the aim of this PhD was to selectively isolate U, Pu, and Am from urine to propose a new analytical procedure to the Medical and Biology Analysis Laboratories. The 1,3,5-OCH{sub 3}-2,4,6-OCH{sub 2}CONHOH-p-tert-butyl-calix[6]arene molecule has been selected as a promising extractant for U, Pu, and Am. Its physico-chemical properties and its affinity for UO{sub 2}{sup 2+} have been studied through two approaches, one theoretical (molecular modelling at DFT level), and one experimental. The extractions of the three actinides by the hydroxamic calix[6]arene were quantitative in liquid-liquid and solid-liquid systems. Their separation has also been shown possible and efficient. After optimization, the proposed procedure should allow the laboratories to carry out the chemical treatment of urine, before the measurement, in one day instead of the three days needed nowadays. (author)

  15. Design complexes calixarenes with fullerenes c60 Дизайн комплексов каликсаренов с фуллеренном C60 ДИЗАЙН КОМПЛЕКСІВ КАЛІКСАРЕНІВ З ФУЛЕРЕНОМ С60

    Directory of Open Access Journals (Sweden)

    О.В. Михайленко

    2006-02-01

    Full Text Available

     There has been investigated the impact of the nature of substitutes upon the thermodynamic and kinetic stability of “guest-host” complexes between a number of calix[4]arene derivatives and the С60 fullerene by the ММ+ method. It has been established that the availability of branched alkyl or aryl groups in 4-position of a calixarene nucleus increases the system stability. There has been also investigated the influence of the substitute’s nature in the lower ring of a calixarene upon its conformation stability and complexing ability.  

     Исследовано влияние природы заместителей на термодинамическую и кинетическую стабильность комплексов типа "гость-хозяин" между фуллереном С60 и некоторыми производными каликс [4] арену методом ММ +. Установлено, что наличие разветвленных алкильных или арильних групп в 4-положении ядра каликсарены повышает устойчивость системы. Рассмотрено влияние природы заместителя в нижнем ободе каликсарены на его
  16. A study of calixarene self-assembled monolayers on gold metal surfaces

    Czech Academy of Sciences Publication Activity Database

    Šustrová, Barbora; Mareček, Vladimír; Štulík, Karel

    Ústí nad Labem: BEST servis, 2010 - (Navrátil, T.; Barek, J.), s. 172-176 ISBN 978-80-254-6710-7. [Modern Electroanalytical Methods /30./. Jetřichovice (CZ), 24.05.2010-28.05.2010] R&D Projects: GA AV ČR IAA400400806 Institutional research plan: CEZ:AV0Z40400503 Keywords : calix[4]arene * self-assembled monolayer (SAM) * gold electrode Subject RIV: CG - Electrochemistry

  17. New Proton-Ionizable, Calixarene-Based Ligands for Selective Metal Ion Separations

    Energy Technology Data Exchange (ETDEWEB)

    Bartsch, Richard A.

    2012-06-04

    The project objective was the discovery of new ligands for performing metal ion separations. The research effort entailed the preparation of new metal ion complexing agents and polymers and their evaluation in metal ion separation processes of solvent extraction, synthetic liquid membrane transport, and sorption. Structural variations in acyclic, cyclic, and bicyclic organic ligands were used to probe their influence upon the efficiency and selectivity with which metal ion separations can be performed. A unifying feature of the ligand structures is the presence of one (or more) side arm with a pendent acidic function. When a metal ion is complexed within the central cavity of the ligand, ionization of the side arm(s) produces the requisite anion(s) for formation of an overall electroneutral complex. This markedly enhances extraction/transport efficiency for separations in which movement of aqueous phase anions of chloride, nitrate, or sulfate into an organic medium would be required. Through systematic structural variations, new ligands have been developed for efficient and selective separations of monovalent metal ions (e.g., alkali metal, silver, and thallium cations) and of divalent metal ion species (e.g., alkaline earth metal, lead, and mercury cations). Research results obtained in these fundamental investigations provide important insight for the design and development of ligands suitable for practical metal ion separation applications.

  18. Extraction of trivalent lanthanides and actinides by ''CMPO-like'' calixarenes

    International Nuclear Information System (INIS)

    Extractive properties of calix[4]arenes bearing carbamoylmethylphosphine oxide moieties on their upper rim toward trivalent lanthanide and actinide cations were investigated. The study revealed that these molecules selectively extract light lanthanides and actinides from heavy lanthanides. All parameters present in the extraction system were varied to determine the origin of the selectivity. It was found that this selectivity requires a calix[4]arene platform and acetamidophosphine oxide groups containing phenyl substituents on the four phosphorus atoms

  19. Rigidified calixarenes bearing four carbamoylmethylphosphineoxide or carbamoylmethylphosphoryl functions at the wide rim

    Science.gov (United States)

    Arduini; Bohmer; Delmau; Desreux; Dozol; Carrera; Lambert; Musigmann; Pochini; Shivanyuk; Ugozzoli

    2000-06-16

    Conformationally rigidified tetraCMPO derivatives have been prepared from calix[4]arene bis(crown ether) 4a in which adjacent oxygens are bridged at the narrow rim by two diethylene glycol links. Acylation of the tetraamine 4c with the CMPO-active ester 5b gave the tetraphosphine oxide 6a, while the tetraphosphinate 6b and the tetraphosphonate 6c were obtained by Arbuzov reaction of tetrabromoacetamido derivative 7 with PhP(OEt)2 or P(OEt)3. The extraction ability of these CMPO derivatives was checked for selected lanthanides and actinides and compared with the analogous compounds 1b, 10b and 10d derived from calix[4]arene tetrapentyl ether. All rigidified bis(crown ether) ligands are more effective extractants than their pentyl ether counterparts and require only 1/10 of the concentration (cL= 10 4M) to obtain the same distribution coefficients, while with CMPO itself a 2,000-fold concentration is necessary. This could be a consequence of a better preorganisation of the ligating functions owing to the rigidity which on the other hand did not change the observed selectivity for americium (DAm/DEu=9-19) and for light lanthanides over heavy ones. NMR relaxivity titration curves show that the complex of Gd3+ with ligand 6a is highly oligomerised in anhydrous acetonitrile over a large range of ligand:metal concentration ratios. Nuclear magnetic relaxation dispersion (NMRD) profiles also showed that large oligomers were formed, and their mean tumbling times were deduced from the Solomon-Bloembergen-Morgan equations. The NMR spectra of dia- and paramagnetic lanthanide complexes with 6a agreed with the presence of two conformers with an elongated calix[4]arene skeleton in which the distances between opposite methylene groups are different. Contrary to what was observed with ligand 2a, the addition of nitrate ions does not labilize the metal complexes, presumably because of the rigidification effect of the ether bridges. Single-crystal X-ray structures were obtained for the active ester 5b and for diphenylphosphorylacetic acid 5a. PMID:10926218

  20. Dimercuration of calix[4]arenes: Novel substitution pattern in calixarene chemistry

    Czech Academy of Sciences Publication Activity Database

    Flídrová, K.; Böhm, S.; Dvořáková, H.; Eigner, Václav; Lhoták, P.

    2014-01-01

    Roč. 16, č. 1 (2014), s. 138-141. ISSN 1523-7060 Grant ostatní: AVČR(CZ) Praemium Academiae Institutional support: RVO:68378271 Keywords : calix[4]arenes * mercuration * meta-substitution * supramolecular chemistry * jana2006 Subject RIV: CC - Organic Chemistry Impact factor: 6.364, year: 2014

  1. Calixarene-stabilised cobalt nanoparticle rings: Self-assembly and collective magnetic properties

    DEFF Research Database (Denmark)

    Wei, A; Tripp, SL; Liu, J;

    2009-01-01

    entropic loss, analogous to the thermodynamic balance of forces governing supramolecular self-assembly. Examination of the Co nanoparticle rings by electron holography (an electron microscopy technique for imaging in-plane magnetic induction) reveals the existence of chiral flux closure (FC) domains at...... room temperature, comprising a 'racemic' mixture of clockwise and anticlockwise states. Furthermore, these FC polarisations can be reversed by applying out-of-plane magnetic pulses (Hz) in alternating directions. This switching behaviour has no known analogy at the macroscopic level, and may represent...

  2. Synthesis and Characterization of Calixarene Tetraethers: An Exercise in Supramolecular Chemistry for the Undergraduate Organic Laboratory

    Science.gov (United States)

    Debbert, Stefan L.; Hoh, Bradley D.; Dulak, David J.

    2016-01-01

    In this experiment for an introductory undergraduate organic chemistry lab, students tetraalkylate tertbutylcalix[4]arene, a bowl-shaped macrocyclic oligophenol, and examine the supramolecular chemistry of the tetraether product by proton nuclear magnetic resonance (NMR) spectroscopy. Complexation with a sodium ion reduces the conformational…

  3. Interfacial Binding of Divalent Cations to Calixarene-Based Langmuir Monolayers

    Energy Technology Data Exchange (ETDEWEB)

    Tulli, Ludovico G.; Wang, Wenjie; Lindemann, William R.; Kuzmenko, Ivan; Meier, Wolfgang; Vaknin, David; Shahgaldian, Patrick

    2015-02-20

    The interactions of Langmuir monolayers produced through the self-assembly of an amphiphilic p-carboxycalix[4]arene (1) with a series of divalent, fourth-period transition metals, at the air-water interface, were investigated. Changes in the interfacial behavior of 1 in response to the presence of CuCl2, CoCl2, MnCl2, and NiCl2 were studied by means of Langmuir compression isotherms and Brewster angle microscopy (BAM). The measurements revealed that the self-assembly properties of 1 are significantly affected by Cu2+ ions. The interactions of 1-based monolayers with Co2+ and Cu2+ ions were further investigated by means of synchrotron radiation-based X-ray reflectivity (XRR), X-ray near-total-reflection fluorescence (XNTRF), and grazing incidence X-ray diffraction (GIXD). XNTRF and XRR analyses revealed that the monolayer of 1 binds more strongly to Cu2+ than Co2+ ions. In the presence of relatively high concentrations of Cu2+ ions in the subphase (1.4 × 10-3 M), XNTRF exhibited anomalous depth profile behavior and GIXD measurements showed considerably strong diffuse scattering. Both measurements suggest the formation of Cu2+ clusters contiguous to the monolayer of 1.

  4. Spheroid Metallacycles and Metallocavitands with Calixarene- and/or Cleft-Shaped Receptors on the Surface.

    Science.gov (United States)

    Shankar, Bhaskaran; Marimuthu, Rajendiran; Deval Sathiyashivan, Shankar; Sathiyendiran, Malaichamy

    2016-05-01

    Flexible hexatopic ligands, 1,2,3,4,5,6-hexakis(1H-naphtho[2,3-d]imidazol-1-ylmethyl)benzene (L(2)) and 1,2,3,4,5,6-hexakis(4,5-diphenylimidazol-1-ylmethyl)benzene (L(3)), containing six neutral naphthanoimidazolyl and 4,5-diphenylimidazolyl N donors were synthesized and used to assemble M6L6L'-type [M = Re(CO)3, L = anionic angular rigid NN donors, and L' = flexible hexatopic N donors] spheroid metallacycles. These molecules with a diameter of ∼17 Å were obtained from Re2(CO)10, H-L (imidazole, benzimidazole, and naphthanoimidazole), and L' [1,2,3,4,5,6-hexakis(benzimidazol-1-ylmethyl)benzene (L(1)), L(2), and L(3)] in a one-step process. Ligands L(2) and L(3) were characterized by elemental analysis, electrospray ionization time-of-flight mass spectrometry (ESI-TOF-MS), and (1)H NMR spectroscopy. Metallacycles 1-5 were characterized by elemental analysis, ESI-TOF-MS, Fourier transform infrared spectroscopy, and single-crystal X-ray diffraction analysis. Molecules 1, 2, and 4 can be considered as metallocavitands and contain multiple solvent-accessible receptors, i.e., two metallocalix[3]arene units and six/four calix[4]arene-/cleft-shaped receptors, on the surface. Guests such as acetone molecules could be accommodated in the calix[4]arene/cleft-shaped receptor of the metallocavitands. PMID:27099992

  5. Coordination chemistry of calixarene. Pt.3: synthesis and extraction studies of tetramethoxy p-tert-butylcalix[4] arene tetraketone

    International Nuclear Information System (INIS)

    P-tert-butylcalix[4] arene and its derivative tetramethoxy p-tert-butylcalix[4] arene tetraketone(L) have been synthesized. The extraction of metal ions, including alkali metal ions, alkaline earth metal ions, and several transition metal ions such as Cu2+, Zn2+, Ni2+, Cd2+ and Hg2+, is studied. It is found that the extractant L has the special extraction efficiency for Na+. The extraction mechanism is also discussed, and the extraction equation can be written as: Na+ + Pi- + L NaLPi(o), where NaLPi represents the composition of the complex. The extraction equilibrium constant for Na+ has been determined to be lg Kex 6.59 at 30+-1 degree C

  6. Study of the Complexation Behavior of Calixarene with Transition Metal Cations by UV—vis and Fluorescent Spectra

    Institute of Scientific and Technical Information of China (English)

    杨俊林; 郑企雨; 等

    2002-01-01

    A new fluorescent compound based on calix[4] arene skeleton was synthesized.Its complexation ability with transition metal ions,such as Fe3+,Co2+,Ni2+,Cu2+,Zn2+ and Ag+,Was investigated by UV-vis and fluorescent spectra.

  7. Study of the Complexation Behavior of Calixarene with Transition Metal Cations by UV-vis and Fluorescent Spectra

    Institute of Scientific and Technical Information of China (English)

    YANG,Jun-Lin(杨俊林); ZHENG,Qi-Yu(郑企雨); AN,Li-Na(安丽娜); CHEN,Chuan-Feng(陈传峰); LIN,Hong-Zhen(蔺洪振); BAI,Feng-Lian(白凤莲); HUANG,Zhi-Tang(黄志镗)

    2002-01-01

    A new fluorescent compound based on calix[4]arene skeleton was synthesized. Its complexation ability with transition metal ions, such as Fe3+, Co2+, Ni2+, Cu2+, Zn2+ and Ag+, was investigated by UV-vis and fluorescent spectra.

  8. High-efficiency pyrene-based blue light emitting diodes: Aggregation suppression using a calixarene 3D-scaffold

    KAUST Repository

    Chan, Khaileok

    2012-01-01

    An efficient blue light emitting diode based on solution processable pyrene-1,3-alt-calix[4]arene is demonstrated, providing a record current efficiency of 10.5 cd A -1 in a simple non-doped OLED configuration. Complete suppression of pyrene aggregation in the solid state is achieved by controlling chromophore dispersion using the 1,3-alt-calix[4]arene scaffold. © 2012 The Royal Society of Chemistry.

  9. Optimization of mixed Langmuir-Blodgett films of a water insoluble porphyrin in a calixarene matrix for optical gas sensing

    International Nuclear Information System (INIS)

    The gas sensing capabilities of Langmuir-Blodgett (LB) mixed films of 5,10,15,20-tetrakis[3,4-bis(2-ethylhexyloxy)phenyl]-21H,23H-porphine (EHO) and p-tert-butylcalix[8]arene (C8A) have been studied in this work. Although EHO is known to be very sensitive to NO2 gas, this study demonstrates that the C8A matrix improves the sensing properties of the porphyrin molecules in the solid state. After the exposure to NO2 and the subsequent recovery, the UV-vis spectrum of a C8A:EHO film shows no aggregation of the porphyrin. In atomic force microscopy (AFM) images, C8A:EHO films appear with sharper surfaces than those made of pure EHO, allowing a better accessibility of the gas molecules to the active binding sites. Multilayer LB films of the C8A:EHO system ranging from 2 to 40 layers have been prepared to study their response to NO2 by UV-vis spectroscopy, and their kinetics reveal an important thickness dependence. Through the analysis of AFM images, it has been found that the surface roughness increases until the sample reaches 20 layers and then remains almost constant, which is related to the response time. The optimum film thickness has been found to be 20 layers, for which both the speed of response and the surface roughness are maximum.

  10. Extractant compositions for co-extracting cesium and strontium, a method of separating cesium and strontium from an aqueous feed, and calixarene compounds

    Science.gov (United States)

    Peterman,Dean R.; Meikrantz,David H.; Law,Jack D.; Riddle,Catherine L.; Todd,Terry A.; Greenhalgh,Mitchell R.; Tillotson,Richard D.; Bartsch,Richard A.; Moyer,Bruce A.; Delmau,Laetitia H.; Bonnesen,Peter V.

    2012-04-17

    A mixed extractant solvent that includes at least one dialkyloxycalix[4]arenebenzocrown-6 compound, 4',4',(5')-di-(t-butyldicyclohexano)-18-crown-6, at least one modifier, and, optionally, a diluent. The dialkyloxycalix[4]arenebenzocrown-6 compound is 1,3-alternate-25,27-di(octyloxy)calix[4]arenebenzocrown-6, 1,3-alternate-25,27-di(decyloxy)calix[4]arenebenzocrown-6, 1,3-alternate-25,27-di(dodecyloxy)calix[4]arenebenzocrown-6, 1,3-alternate-25,27-di(2-ethylhexyl-1-oxy)calix[4]arenebenzocrown-6, 1,3-alternate-25,27-di(3,7-dimethyloctyl-1-oxy)calix[4]arenebenzocrown-6, 1,3-alternate-25,27-di(4-butyloctyl-1-oxy)calix[4]arenebenzocrown-6, or combinations thereof. The modifier is a primary alcohol. A method of separating cesium and strontium from an aqueous feed is also disclosed, as are dialkyloxycalix[4]arenebenzocrown-6 compounds and an alcohol modifier.

  11. Efficient singlet oxygen generation by luminescent 2-(2′-thienyl) pyridyl cyclometalated platinum(II) complexes and their calixarene derivatives

    OpenAIRE

    Lai, Siu-Wai; Liu, Ying; Zhang, Dong; Wang, Bin; Lok, Chun-Nam; Che, Chi-Ming; Selke,Matthias

    2010-01-01

    Luminescent cyclometalated platinum(II) complexes, namely [Pt(Thpy)(PPh 3)X] n+ (HThpy = 2-(2′-thienyl)pyridine; X = Cl - (1), n = 0; X = CH 3CN (2), pyridine (3), n = 1) and [Pt(Thpy)(HThpy)Y] n+ (Y = Cl - (4), n = 0; Y = pyridine (5), n = 1), exhibit structured emission with peak maximum at ∼556 and 598 nm in degassed acetonitrile and with emission quantum yield and lifetime of up to 0.38 and 26 μs, respectively. These complexes are efficient photosensitizers of singlet oxygen with yields u...

  12. Calixarene-based extraction chromatographic separation of ¹³⁵Cs and ¹³⁷Cs in environmental and waste samples prior to sector field ICP-MS analysis.

    Science.gov (United States)

    Russell, Ben C; Warwick, Phil E; Croudace, Ian W

    2014-12-01

    Advances in the sensitivities achievable by sector field inductively coupled plasma mass spectrometry (ICP-SFMS) offer the prospect of low-level measurement of shorter and longer lived radionuclides, thus expanding options for environmental and radioactively contaminated land assessment. In ICP-SFMS, the critical requirement for accurate detection is the effective chemical separation of isobaric and polyatomic interferences prior to sample introduction. As instrumental detection limit capability improves, accurate radionuclide determination requires highly effective separation materials that combine high analyte selectivity with subsequent quantitative analyte recovery compatible with ICP-SFMS detection. Two radioactive isotopes measurable by ICP-SFMS are the high yield fission products (135)Cs and (137)Cs that have entered the environment as a result of anthropogenic nuclear activities. ICP-SFMS enables reliable measurement of (135)Cs/(137)Cs ratios, which can be used as a forensic tool in determining the source of nuclear contamination. The critical requirement for accurate detection is the effective removal of isobaric interferences from (135)Ba and (137)Ba prior to measurement. A number of exchange materials can effectively extract Cs; however, non-quantitative elution of Cs makes subsequent ICP-SFMS quantification challenging. A novel extraction chromatographic resin has been developed by dissolving calix[4]arene-bis(tert-octylbenzo-crown-6) (BOBCalixC6) in octan-1-ol and loading onto an Amberchrom CG-71 prefilter resin material. Preparation of the material takes less than 1 h and, at an optimal concentration of 3 M HNO3, shows high selectivity toward Cs, which is effectively eluted in 0.05 M HNO3. The procedure developed shows high Cs selectivity and Ba decontamination from digests of complex matrixes including a saltmarsh sediment contaminated by aqueous discharges from a nuclear fuel reprocessing facility. Repeated tests show the resin can be reused up to four times. For low-level ICP-SFMS quantification, more complex sample matrixes benefit from a cation resin cleanup stage prior to using BOBCalixC6 that serves to enhance Ba decontamination and Cs recovery. PMID:25374264

  13. Versatile assembly of p-carboxylatocalix[4]arene-O-alkyl ethers

    Energy Technology Data Exchange (ETDEWEB)

    Kennedy, Stuart; Teat, Simon J.; Dalgarno, Scott J.

    2009-07-08

    Crystallisation of lower-rim tetra-O-alkylated p-carboxylatocalix[4]arenes from pyridine results in the formation of both bi-layer and pillar type supramolecular motifs. Full alkylation at the calixarene lower rim has significant influence over the supramolecular self-assembly motif, including preclusion of pyridine guest molecules from the calixarene cavity in the solid state.

  14. Detection of the volatile organic compounds emitted from paints using optical fibre long period grating modified with the mesoporous nano-scale coating

    Science.gov (United States)

    Hromadka, Jiri; James, Stephen; Davis, Frank; Tatam, Ralph P.; Crump, Derrick; Korposh, Sergiy

    2015-09-01

    An optical fibre long period grating (LPG) modified with a mesoporous film infused with a calixarene as a functional compound was employed for the detection of a mixture of volatile organic compounds (VOCs). The sensing mechanism is based on the transduction of the refractive index change induced by the complexion of the VOCs with calixarene into a change in the form of the transmission spectrum of the LPG. An LPG, modified with a calixarene-infused coating comprising 5 cycles of silica nanoparticles/poly(allylamine hydrochloride) polycation (SiO2/PAH), was exposed to mixture of VOCs emitted from paint at conditions simulating ISO standards test (16000-10).

  15. Unexpected Formation of Disulfide-based Biscalix[4]arenes

    Czech Academy of Sciences Publication Activity Database

    Stejskal, F.; Cuřínová, Petra; Lhoták, P.

    2016-01-01

    Roč. 72, č. 5 (2016), s. 760-766. ISSN 0040-4020 Institutional support: RVO:67985858 Keywords : calixarene * bridging reaction * complexation Subject RIV: CC - Organic Chemistry Impact factor: 2.641, year: 2014

  16. Direct C–H Azidation of Calix[4]arene as a Novel Method to Access Meta Substituted Derivatives

    Czech Academy of Sciences Publication Activity Database

    Stejskal, F.; Eigner, V.; Dvořáková, H.; Cuřínová, Petra; Lhoták, P.

    2015-01-01

    Roč. 56, č. 39 (2015), s. 5357-5361. ISSN 0040-4039 Institutional support: RVO:67985858 Keywords : calixarene * azidation * regionselectivity Subject RIV: CC - Organic Chemistry Impact factor: 2.379, year: 2014

  17. Quantum molecular dynamics of guest molecules in supramolecular complexes

    OpenAIRE

    Panesar, Kuldeep Singh

    2009-01-01

    The quantum motion of guest molecules has been studied in a variety of calixarene host-guest complexes, and in a endohedral fullerene complex. The guest molecules of the calixarene complexes studied each comprise weakly hindered methyl groups, which undergo rotation via quantum tunnelling, even at cryogenic temperatures. The rotational motion of the guest methyl-groups has been studied by making temperature and frequency-dependent measurements of proton T1, using field-cycling NMR, thus re...

  18. Transition Metal Complexes of Calix[4]arene: Theoretical Investigations into Small Guest Binding within the Host Cavity.

    Science.gov (United States)

    Murphy, Paul; Dalgarno, Scott J; Paterson, Martin J

    2016-02-11

    The ability to selectively detect or store small molecules, such as gases, is of enormous commercial potential. Calixarenes have been studied extensively as host molecules; however, recent synthetic advances have seen the formation of new polymetallic calixarene clusters, which have not yet been explored for such purposes. We therefore present a theoretical study, using Density Functional Theory, to thoroughly investigate the binding preferences of calix[4]arene, with a variety of transition metal cations coordinated to the calixarene tetraphenolic pocket, toward a series of important small molecules, H2S, SO2, H2O, O2, H2, N2, N2O, CO2, NH3, and HCN. It was found that the inclusion of a metal atom at the lower-rim of the calixarene caused significant strengthening of binding energy with all of the small molecules in our study as compared to metal-free calixarene. The guests, SO2 and NH3, were found to bind strongest with H2 binding weakest. Our calculations predict that simply introducing metal coordination of any type to calix[4]arene will make the largest difference to the binding energies. Subsequently changing the type, oxidation state, or the spin state of the metal coordinated to the calixarene tetraphenolic pocket was found to have a lesser effect on these. PMID:26783648

  19. Determination of the extractive capacity of para-tert butyl calix[8]arene octa-phosphinoylated towards uranyl ions from an aqueous-acidic-salty medium

    International Nuclear Information System (INIS)

    The extraction properties of octa-phosphinoylated para-tert butyl calix[8]arene (prepared in the laboratory) in chloroform towards uranyl ions from an aqueous-acidic-salty medium (HNO3-3.5 NaNO3) containing uranyl nitrate salt, was investigated. Two spectroscopic techniques UV/Vis and Luminescence were used for this study. The latter permitted analyze the fluorescence from the uranyl ions influenced by the surrounding medium. Both permitted to learn about the power of this calixarene as extractant towards the mentioned ions. Its extraction ability or capability using this calixarene at 5.91 x 10-4 M towards the uranyl ions was 400% as determined by UV/Vis while fluorescence revealed 100% of uranyl ion extraction. A closed analysis of the results obtained by using these techniques revealed that the stoichiometry of the main extracted species was 1calixarene:2 uranyl ions. The loading capacity of the calixarene ligand towards the uranyl ions was also investigated using both techniques. UV/Vis resulted to be inadequate for quantifying exactly the loading capacity of the calixarene whereas luminescence was excellent indeed, using a 5.91 x 10-4 M calixarene concentration, its loading capacity was 0.157 M of free uranyl ions from 0.161 M of uranyl ions present in the aqueous-acidic-salty medium. The extracts from the ability and capacity studies were concentrated to dryness, purified and the dried extracts were analyzed by infrared and neutron activation analysis. By these techniques it was demonstrated that during the extraction of the uranyl ions by the calixarene ligand they form thermodynamically and kinetically stable complexes, since in the solid state, the 1:2, calixarene; uranyl ions stoichiometry was kept with the minimum formula: (UO2)2B8bL8(NO3)4(H2O)4CHCl3(CH3OH)3 the methanol molecules come from its purification. It is proposed that B8bL8 calixarene in chloroform medium is a good extractant for the treatment of nuclear wastes or radioactive wastes containing

  20. Determination of the extractive capacity of para-tert butyl calix[8]arene octa-phosphinoylated towards uranyl ions from an aqueous-acidic-salty medium; Determinacion de la capacidad extractiva del p-ter-butilocalix[8]areno octa-fosfinoilado hacia iones uranilo de un medio acuo-acido salino

    Energy Technology Data Exchange (ETDEWEB)

    Serrano V, E. C.

    2011-07-01

    The extraction properties of octa-phosphinoylated para-tert butyl calix[8]arene (prepared in the laboratory) in chloroform towards uranyl ions from an aqueous-acidic-salty medium (HNO{sub 3}-3.5 NaNO{sub 3}) containing uranyl nitrate salt, was investigated. Two spectroscopic techniques UV/Vis and Luminescence were used for this study. The latter permitted analyze the fluorescence from the uranyl ions influenced by the surrounding medium. Both permitted to learn about the power of this calixarene as extractant towards the mentioned ions. Its extraction ability or capability using this calixarene at 5.91 x 10{sup -4} M towards the uranyl ions was 400% as determined by UV/Vis while fluorescence revealed 100% of uranyl ion extraction. A closed analysis of the results obtained by using these techniques revealed that the stoichiometry of the main extracted species was 1calixarene:2 uranyl ions. The loading capacity of the calixarene ligand towards the uranyl ions was also investigated using both techniques. UV/Vis resulted to be inadequate for quantifying exactly the loading capacity of the calixarene whereas luminescence was excellent indeed, using a 5.91 x 10{sup -4} M calixarene concentration, its loading capacity was 0.157 M of free uranyl ions from 0.161 M of uranyl ions present in the aqueous-acidic-salty medium. The extracts from the ability and capacity studies were concentrated to dryness, purified and the dried extracts were analyzed by infrared and neutron activation analysis. By these techniques it was demonstrated that during the extraction of the uranyl ions by the calixarene ligand they form thermodynamically and kinetically stable complexes, since in the solid state, the 1:2, calixarene; uranyl ions stoichiometry was kept with the minimum formula: (UO{sub 2}){sub 2}B{sub 8}bL{sup 8}(NO{sub 3}){sub 4}(H{sub 2}O){sub 4}CHCl{sub 3}(CH{sub 3}OH){sub 3} the methanol molecules come from its purification. It is proposed that B{sub 8}bL{sup 8} calixarene in

  1. N-anthracenylmethyl calix[4]azacrowns as new fluorescent ionophores

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Seung H.; Shon, Ok J.; Kim, Jong S. [Konyang Univ., Nonsan (Korea, Republic of); Park, Ki M.; Lee, Shim S. [Gyeongsang National Univ., Chinju (Korea, Republic of); Park, Ho J.; Kim, Moon J. [Soonchunhyang Univ., Asan (Korea, Republic of); Lee, Joung H. [Korea Research Institute of Standards and Science, Daejon (Korea, Republic of)

    2002-11-01

    Two novel calixarene-based fluoroionophores were synthesized. Their conformations were confirmed to 1,3-alternate by X-ray crystal structures. From CHEF by blocking the PET mechanism in fluorescence spectra, we observed In{sup 3+} and Pb{sup 2+} ion selectivity over other metal ions. For In{sup 3+} ion, calix[4]-bis-azacrown-5 showed about 20 times more sensitive than calix[4]-mono-azacrown-5 because the source of the binding selectivity comes from the calixarene framework and azacrown ligand by controlling the fluorescence and PET mechanisms associated with the amine moiety.

  2. A New, Simple and Versatile Strategy for the Synthesis of Short Segments of Zigzag-Type Carbon Nanotubes.

    Science.gov (United States)

    André, Etienne; Boutonnet, Baptiste; Charles, Pauline; Martini, Cyril; Aguiar-Hualde, Juan-Manuel; Latil, Sylvain; Guérineau, Vincent; Hammad, Karim; Ray, Priyanka; Guillot, Régis; Huc, Vincent

    2016-02-01

    Short segments of zigzag single-walled carbon nanotubes (SWCNTs) were obtained from a calixarene scaffold by using a completely new, simple and expedited strategy that allowed fine-tuning of their diameters. This new approach also allows for functionalised short segments of zigzag SWCNTs to be obtained; a prerequisite towards their lengthening. These new SWCNT short segments/calixarene composites show interesting behaviour in solution. DFT analysis of these new compounds also suggests interesting photophysical behaviour. Along with the synthesis of various SWCNTs segments, this approach also constitutes a powerful tool for the construction of new, radially oriented π systems. PMID:26814358

  3. Crystal structure of the inclusion complex 25-benzoylmethoxy-5,11,17,23-tetra-tert-butyl-26,27,28-trihydroxy-2,8,14,20-tetrathiacalix[4]arene–tetraethylammonium chloride (1/1)

    OpenAIRE

    Mehmet Akkurt; Jerry P. Jasinski; Shaaban K. Mohamed; Omran, Omran A.; Mustafa R. Albayati

    2015-01-01

    The asymmetric unit of the title compound, C48H54O5S4·N(C2H5)4+·Cl−, contains two tetra-tert-butyl-[(benzoyl)methoxy]-trihydroxy-tetrathiacalix[4]arene molecules, two tetraethylammonium cations and two chloride anions. The two calixarene molecules in the asymmetric unit each display a cone conformation. There are no significant differences between the two independent molecules. The guest species do not sit within the calixarene `buckets'. In the crystal, extensive O—H...O, O—H...S and O—H...C...

  4. Solubilities of calix[6]arene and 4-tert-butylcalix[4]arene in pressurized hot water

    Czech Academy of Sciences Publication Activity Database

    Karásek, Pavel; Planeta, Josef; Roth, Michal

    2014-01-01

    Roč. 59, č. 8 (2014), s. 2433-2436. ISSN 0021-9568 R&D Projects: GA ČR(CZ) GAP206/11/0138 Institutional support: RVO:68081715 Keywords : solubility of calixarenes * pressurized hot water * cavitand additives Subject RIV: CB - Analytical Chemistry, Separation Impact factor: 2.037, year: 2014

  5. Synthesis of Ultra—high Molecular Weight Polystyrene with a Catalyst System Based on Calixarene—Yttrium Complex

    Institute of Scientific and Technical Information of China (English)

    陈耀烽; 张一烽; 沈之荃

    2003-01-01

    Polymerization of styrene(St)with a new catalyst system composed of calixarene-yitrium complex,magnesium-aluminium alkyls and hexamethyl phosphoramide was studied.The catalyst system shows extremely high activity(>7×106gPSt/mol Y·h)and gives polystyrene with very high viscosity-average molecular weight(>5×105).

  6. Anionic tert-butyl-calix[4]arenes substituted at the narrow and wide rim by cobalt bis(dicarbollide)(1-) ions and CMPO-groups. Effect of stereochemistry and ratios of the functional groups on the platform on the extraction efficiency for Ln(III)/An(III)

    Czech Academy of Sciences Publication Activity Database

    Grüner, Bohumír; Böhmer, V.; Dordea, C.; Selucký, P.; Bubeníková, M.

    2013-01-01

    Roč. 747, december (2013), s. 155-166. ISSN 0022-328X R&D Projects: GA ČR GA104/09/0668 Institutional support: RVO:61388980 Keywords : Actinides * Calixarenes * Carboranes * Lanthanides * Liquid-liquid extraction Subject RIV: CA - Inorganic Chemistry Impact factor: 2.302, year: 2013

  7. Systematic Approach to New Ligands for Anion Recognition Based on Ureido-calix[4]arenes

    Czech Academy of Sciences Publication Activity Database

    Stibor, I.; Budka, J.; Michlová, V.; Tkadlecová, M.; Pojarová, M.; Cuřínová, Petra; Lhoták, P.

    2008-01-01

    Roč. 32, č. 9 (2008), s. 1597-1607. ISSN 1144-0546 R&D Projects: GA ČR GA203/06/0738; GA AV ČR IAA400720706 Institutional research plan: CEZ:AV0Z40720504 Keywords : calixarene * receptor chemistry * urea derivatives Subject RIV: CF - Physical ; Theoretical Chemistry Impact factor: 2.942, year: 2008

  8. Modification of a Polycrystalline Gold Electrode by Thiolated Calix[4]arene and Undecanethiol: Self-assembly Process versus Electrochemical Deposition

    Czech Academy of Sciences Publication Activity Database

    Šustrová, Barbora; Štulík, Karel; Mareček, Vladimír

    2013-01-01

    Roč. 8, č. 4 (2013), s. 4367-4383. ISSN 1452-3981 R&D Projects: GA ČR(CZ) GAP208/12/1645; GA AV ČR IAA400400806 Institutional support: RVO:61388955 Keywords : Thiolated calixarene * Polycrystalline gold * Surface modification Subject RIV: CG - Electrochemistry Impact factor: 1.956, year: 2013

  9. Anion Binding by Meta Ureido-substituted Thiacalix[4]arenes

    Czech Academy of Sciences Publication Activity Database

    Kundrát, O.; Eigner, V.; Cuřínová, Petra; Kroupa, J.; Lhoták, P.

    2011-01-01

    Roč. 67, č. 43 (2011), s. 8367-8372. ISSN 0040-4020 R&D Projects: GA ČR GA203/09/0691; GA AV ČR IAAX08240901 Institutional support: RVO:67985858 Keywords : calixarene * meta nitration * recognition Subject RIV: CC - Organic Chemistry Impact factor: 3.025, year: 2011

  10. Fullerene recognition by 5-nitro-11,17,23,29-tetramethylcalix[5]arene

    Czech Academy of Sciences Publication Activity Database

    Flídrová, K.; Liška, Alan; Ludvík, Jiří; Eigner, V.; Lhoták, P.

    2015-01-01

    Roč. 56, č. 12 (2015), s. 1535-1538. ISSN 0040-4039 R&D Projects: GA ČR GA13-21704S Institutional support: RVO:61388955 Keywords : calixarene * fullerene * complexation Subject RIV: CG - Electrochemistry Impact factor: 2.379, year: 2014

  11. Separation of uranium from aqueous solutions using calix[6]arenes in liquid-liquid extraction as well as solid phase extraction; Abtrennung von Uran aus waessriger Loesung durch Calix[6]arene mittels Fluessig-Fluessig-Extraktion sowie Festphasen-Extraktion

    Energy Technology Data Exchange (ETDEWEB)

    Schmeide, K.; Geipel, G.; Bernhard, G.

    2004-11-01

    The suitability of different calyx[n] arene types for uranyl extraction from liquid solutions was examined by means of liquid-liquid extraction using aqueous phases and organic solvents of varying compositions. It was found that COOH-derivatised calyx[6] arenes have good extraction properties and can even be used in the acid pH range. The use of calixarene-modified fleeces for the separation of uranyl from aqueous phases was examined in batch experiments with pH and uranyl concentration as variables and in the presence or absence of competing ions. The results showed that calixarene-modified fleeces can be used for uranium separation starting from pH 4. At pH 5, up to a maximum of 7.6 x 10{sup -7} mol uranium can be bound per 1 g of calixarene-modified fleece. The separation of uranyl from synthetic pit waters was examined as a means of testing the separation capacity of calixarene-modified fleeces in environmentally sensitive waters. Studies on the reversibility of uranium bonding to calixarene-treated polyester fleeces have shown that under environmentally realistic conditions (neutral pH range) the uranium is firmly bound to the calixarene-modified fleeces and cannot be mobilised. By contrast, in acidic environments calixarene-modified fleeces are capable of near-complete regeneration. Such regenerated textile filter materials can then be used for further uranium separation cycles. [German] Die Eignung verschiedener Calix[n]aren-Typen fuer die Uranylextraktion aus waessriger Loesung wurde mittels Fluessig-Fluessig-Extraktion unter Variation der Zusammensetzung der waessrigen Phase und des organischen Loesungsmittels untersucht. Es konnte gezeigt werden, dass COOH-derivatisierte Calix[6]arene gute Extraktionseigenschaften aufweisen und selbst im sauren pH-Bereich angewendet werden koennen. Die Uranylabtrennung aus waessriger Loesung durch calixarenmodifizierte Vliese wurde in Abhaengigkeit des pH-Wertes und der Uranylkonzentration in Abwesenheit und Gegenwart von

  12. Clicked and long spaced galactosyl- and lactosylcalix[4]arenes: new multivalent galectin-3 ligands

    Directory of Open Access Journals (Sweden)

    Silvia Bernardi

    2014-07-01

    Full Text Available Four novel calix[4]arene-based glycoclusters were synthesized by conjugating the saccharide units to the macrocyclic scaffold using the CuAAC reaction and using long and hydrophilic ethylene glycol spacers. Initially, two galactosylcalix[4]arenes were prepared starting from saccharide units and calixarene cores which differ in the relative dispositions of the alkyne and azido groups. Once the most convenient synthetic pathway was selected, two further lactosylcalix[4]arenes were obtained, one in the cone, the other one in the 1,3-alternate structure. Preliminary studies of the interactions of these novel glycocalixarenes with galectin-3 were carried out by using a lectin-functionalized chip and surface plasmon resonance. These studies indicate a higher affinity of lactosyl- over galactosylcalixarenes. Furthermore, we confirmed that in case of this specific lectin binding the presentation of lactose units on a cone calixarene is highly preferred with respect to its isomeric form in the 1,3-alternate structure.

  13. The effect of p-tert-butylcalix[4]arene on radiation degradation of polypropylene

    International Nuclear Information System (INIS)

    Polypropylene(PP) containing cyclic phenolic antioxidant, p-tert-butylcalix[4] arene as additive was irradiated with γ-ray in air or in vacuum at ambient temperature. The mechanical properties, variation of IR spectra and decomposition temperature by thermal analysis were measured for the irradiated PP sheets. Compared with BHT, p-tert-butylcalix[4]arene showed radiation stabilization towards PP during and after irradiation, especially at a high dose. By means of ESR spectra and other spectra of formation of the stable calix[4]arene radical was confirmed. No decomposition species of the calixarene was observed with the dose≤1000 kGy and the dose rate of 6.5 x 103 kGy/h indicating the higher radiation-resistance of the calixarene structure

  14. Solvent Extraction External Radiation Stability Testing

    Energy Technology Data Exchange (ETDEWEB)

    Peterson, R.A.

    2001-01-05

    Personnel irradiated a number of samples of calixarene-based solvent. Analysis of these samples indicated that measurable loss of the calixarene occurred at very high doses (-16 Mrad). No measurable loss of the Cs-7SB modifier occurred at equivalent doses. The primary degradation product, 4-sec-butylphenol, observed during analysis of the samples came from degradation of the modifier. Also, TOA proved more susceptible to damage than the other components of the solvent. The total degradation of the solvent proved relatively minor. The consistent solvent performance, as indicated by the measured D Cs values, after exposure at high total doses serves as evidence of the relatively low degree of degradation of the solvent components. Additional tests employing internal irradiation of solvents with both simulants and SRS tank waste will be completed by the end of March 2001 to provide confirmation of the results presented herein.

  15. Main results obtained in the European project related to the extraction of long lived radionuclides by functionalized macrocycles

    International Nuclear Information System (INIS)

    Reprocessing operations generate medium level wastes (liquid waste treatment, facility decommissioning) containing medium and long lived nuclides such as 90Sr, 137Cs and actinides. A large share of these high salinity solutions must be disposed of in geological formations or in long term disposal centers after embedding due to the presence of these medium and long lived nuclides. Removing them from the contaminated liquid waste before embedding would allow a large part of the waste to be sent to a near-surface repository, with a very small share, containing most of the long lived nuclides, to be disposed of after conditioning. To minimize the volume of waste, it is of paramount importance to find compounds able to remove the medium and long lived radionuclides with high efficiency and selectivity, from acidic or high salinity media, and to release the extracted salts, if possible, in deionized water. For the present European project, substantial progress has been achieved in the extraction of cesium, strontium and trivalent actinides, with di alkoxy calixarenes benzo crown 6, calix(8)arenes bearing diethyl amide units and calixarenes with CMPO extracting units respectively. Molecular modeling simulations showed that the addition of one or two benzene units on the crown increases the affinity for cesium due to a better fit between the cation and the crown, but lowers the affinity for sodium due to solvation effects. These predictions were confirmed by the synthesis and study of the complexation and extraction properties of these compounds. DC18C6 and its derivatives are currently the most powerful strontium extractants known. Calix(n)arenes, especially calix(8)arenes with di-ethyl-amide functions display much higher complexing and extracting abilities than crown ethers in a broad range of acidities. More than one hundred compounds containing phosphoryl units were synthesized for the project. Oligomer synthesis (monomer to pentamer) highlighted the role of the

  16. Crystal structure of the inclusion complex 25-benzo­ylmeth­oxy-5,11,17,23-tetra-tert-butyl-26,27,28-trihy­droxy-2,8,14,20-tetra­thia­calix[4]arene–tetra­ethyl­ammonium chloride (1/1)

    OpenAIRE

    Akkurt, Mehmet; Jerry P. Jasinski; Shaaban K. Mohamed; Omran, Omran A.; Mustafa R. Albayati

    2015-01-01

    The asymmetric unit of the title compound, C48H54O5S4·N(C2H5)4 +·Cl−, contains two tetra-tert-butyl-[(benzo­yl)meth­oxy]-trihy­droxy-tetra­thia­calix[4]arene mol­ecules, two tetra­ethyl­ammonium cations and two chloride anions. The two calixarene molecules in the asymmetric unit each display a cone conformation. There are no significant differences between the two independent molecules. The guest species do not sit within the calixarene ‘buckets’. In the crystal, extensive O—H⋯O, O—H⋯S and O—...

  17. Investigation of the mechanism of formation of overbased detergents

    CERN Document Server

    Courtois, J P

    2002-01-01

    This thesis describes an experimental study of calixarate overbased detergent oil additives, used to neutralise acidic by-products of engine combustion. Aspects of interest in this study include experimental synthesis of calixarenes and overbased detergents, physical and structural characterisation and monitoring of the synthesis process. Two types of calixarenes were prepared (6 and 8 phenolic units). A synthesis procedure of the calixarate overbased detergent was set up, based on adaptation of existing procedures used for other classes of overbased detergents. The procedure was also modified to suit a lab-scale. sup 1 sup 3 C NMR and UV-Vis spectroscopy have provided strong evidence for a precursor of the overbased detergent. The ionisation of the surfactants (stearic acid carboxylic group, and phenolic units) was clearly established. The synthesis process was monitored at the molecular and macroscopic level. The use of sup 1 sup 3 C-labelled compounds enabled a semi-quantitative study of the concentration ...

  18. Selective transport of ions and molecules across layer-by-layer assembled membranes of polyelectrolytes, p-sulfonato-calix[n]arenes and Prussian Blue-type complex salts.

    Science.gov (United States)

    Tieke, Bernd; Toutianoush, Ali; Jin, Wanqin

    2005-11-30

    Our recent studies in the field of ultrathin membranes prepared upon layer-by-layer assembly of various polyionic compounds such as polyelectrolytes, calixarenes and polyelectrolytes, and metal hexacyanoferrate salts such as Prussian Blue are reviewed. It is demonstrated that polyelectrolyte multilayers can be used (a) as nanofiltration and reverse osmosis membranes suitable for water softening and seawater desalination and (b) as molecular sieves and ion sieves for size-selective separation of neutral and charged aromatic compounds. Furthermore, hybrid membranes of p-sulfonato-calixarenes and cationic polyelectrolytes showing specific host-guest interactions with permeating ions are described. The membranes exhibit high selectivities for distinct metal ions. Finally, it is demonstrated that purely inorganic membranes of Prussian Blue (PB) and analogues can be prepared upon multiple sequential adsorption of transition metal cations and hexacyanoferrate anions. Due to the porous lattice of PB, the membranes are useful as ion filters able to separate cesium from sodium ions, for example. PMID:16091277

  19. Calix[4]arene coated QCM sensors for detection of VOC emissions: Methylene chloride sensing studies.

    Science.gov (United States)

    Temel, Farabi; Tabakci, Mustafa

    2016-06-01

    This paper describes the sensing studies of QCM sensors with coated some calixarene derivatives bearing different functional groups for some selected Volatile Organic Compounds (VOCs) such as acetone, acetonitrile, carbon tetrachloride, chloroform, methylene chloride (MC), N,N-dimethylformamide, 1,4-dioxane, ethanol, ethyl acetate, xylene, methanol, n-hexane and toluene. The initial experiments have revealed that whole the calix[4]arene modified QCM sensors exhibited strongest sensing ability to MC emissions. Thus, the detailed studies were performed for only MC emissions after the determination of relatively more effective calix-coated QCM sensors for MC emissions in aqueous media. The results demonstrated that QCM sensor coated with calix-7 bearing both amino and imidazole groups was most useful sensor for MC emissions with 54.1ppm of detection limit. Moreover, it was understood that cyclic structures, H-bonding capabilities and also good preorganization properties of calixarene derivatives played an important role in VOC sensing processes. PMID:27130112

  20. Solvent Extraction External Radiation Stability Testing

    International Nuclear Information System (INIS)

    Personnel irradiated a number of samples of calixarene-based solvent. Analysis of these samples indicated that measurable loss of the calixarene occurred at very high doses (-16 Mrad). No measurable loss of the Cs-7SB modifier occurred at equivalent doses. The primary degradation product, 4-sec-butylphenol, observed during analysis of the samples came from degradation of the modifier. Also, TOA proved more susceptible to damage than the other components of the solvent. The total degradation of the solvent proved relatively minor. The consistent solvent performance, as indicated by the measured D Cs values, after exposure at high total doses serves as evidence of the relatively low degree of degradation of the solvent components. Additional tests employing internal irradiation of solvents with both simulants and SRS tank waste will be completed by the end of March 2001 to provide confirmation of the results presented herein

  1. Synergistic effect of ligating and ionic functions, prearranged on a calix[4]arene.

    Science.gov (United States)

    Mikulásek, Libor; Grüner, Bohumír; Danila, Crenguta; Bohmer, Volker; Cáslavský, Josef; Selucký, Pavel

    2006-10-14

    The covalent attachment of two CMPO-functions and two anionic Cosan groups to the narrow rim of tert-butylcalix[4]arene leads to a dramatic increase of the extraction efficiency for the cone isomer; Am(3+) is removed from 5 x 10(-8) M solution to more than 99% by a single extraction step with a 3 x 10(-6) M solution of the calixarene. PMID:17003879

  2. Electrochemical Reduction of 1,3-Alt-tetranitrothiacalix[4]arenes

    Czech Academy of Sciences Publication Activity Database

    Liška, Alan; Ludvík, Jiří

    Ústí nad Labem : Best Servis, 2014 - (Navrátil, T.; Fojta, M.; Pecková, K.), s. 85-89 ISBN 978-80-905221-2-1. [Moderní Elektrochemické Metody /34./. Jetřichovice (CZ), 19.05.2014-23.05.2014] Institutional support: RVO:61388955 Keywords : electrochemistry * 1,3-Alt-tetranitrothiacalix[4]arenes * calixarenes Subject RIV: CG - Electrochemistry

  3. Neue potenziell sensoraktive Calix[4]arene mit spezifischer Substitution am oberen und unteren Kelchrand sowie in lateraler Kelchposition

    OpenAIRE

    Gruber, Tobias

    2009-01-01

    Gegenstand dieser Arbeit ist die Entwicklung, Synthese und Charakterisierung von fluorogenen Calixaren-Wirtverbindungen. An die zunächst synthetisierten kopplungsfähigen Calix[4]arene mit gezielt eingestellter Lipophilie wurden in einem zweiten Schritt Dansyl- bzw. Pyrenylreste kovalent angeknüpft. Auf diesem Wege gelang es, dreizehn Zielverbindungen darzustellen, die sich in ihrer konformativen Flexibilität unterscheiden und durch eine ausgewogene Hydrophilie-Lipophilie-Balance in der Lage s...

  4. Glycopeptide dendrimers. Part I

    Czech Academy of Sciences Publication Activity Database

    Niederhafner, Petr; Šebestík, Jaroslav; Ježek, Jan

    2008-01-01

    Roč. 14, č. 1 (2008), s. 2-43. ISSN 1075-2617 R&D Projects: GA ČR GA203/03/1362; GA ČR GA203/06/1272; GA MZe QF3115; GA AV ČR KAN200520703 Institutional research plan: CEZ:AV0Z40550506 Keywords : artificial virus * calixarene dendrimers * carbopeptide dendrimers * glycopeptide dendrimers Subject RIV: CC - Organic Chemistry Impact factor: 1.654, year: 2008

  5. Cobalt bis(dicarbollides)(1-) covalently attached to the calix[4]arene platform: The first combination of organic bowl-shaped matrices and inorganic metallaborane cluster anions

    Czech Academy of Sciences Publication Activity Database

    Grüner, Bohumír; Mikulášek, Libor; Báča, Jiří; Císařová, I.; Böhmer, V.; Danila, C.; Reinoso-García, M.M.; Verboom, W.; Reinhoudt, D.N.; Casnati, A.; Ungaro, R.

    -, č. 10 (2005), s. 2022-2039. ISSN 1434-193X R&D Projects: GA MŠk(CZ) LC523; GA AV ČR KSK4050111 Grant ostatní: EEC(XE) F16W-CT-2003-508854 Institutional research plan: CEZ:AV0Z40320502 Keywords : calixarenes * carboranes * dicarbollides Subject RIV: CA - Inorganic Chemistry Impact factor: 2.548, year: 2005

  6. Supramolecular approaches to cryorelaxors for biological NMR studies

    OpenAIRE

    Cuda, F.

    2010-01-01

    The work reported in this thesis concerns the development of Cryorelaxors having potential applications in very low temperature NMR studies of biological materials. Two approaches have been explored, namely calixarene host-guest complexes incorporating rotationally labile methyl groups, and endohedral fullerene complexes. The first chapter provides an overview of the background of the project and of potential approaches to the problem of low temperature relaxation agents, particularly thos...

  7. Uranyl complexes formed with a para-t-butylcalix[4]arene bearing phosphinoyl pendant arms on the lower rim. Solid and solution studies

    Energy Technology Data Exchange (ETDEWEB)

    Ramirez, F. de M. [Instituto Nacional de Investigaciones Nucleares, La Marquesa, Ocoyoacac (Mexico). Dept. de Quimica; Varbanov, S. [Bulgarian Academy of Sciences, Sofia (Bulgaria). Inst. of Organic Chemistry with Center of Phytochemistry; Buenzli, J.C.G. [Ecole Polytechnique Federale de Lausanne (EPFL) (Switzerland). Inst. of Chemical Sciences and Engineering; Rivas-Silva, J.F.; Ocana-Bribiesca, M.A. [Instituto de Fisica de la BUAP, Puebla (Mexico); Cortes-Jacome, M.A.; Toledo-Antonio, J.A. [Instituto Mexicano del Petroleo/Programa de Ingenieria Molecular (Mexico)

    2012-07-01

    The current interest in functionalized calixarenes with phosphorylated pendant arms resides in their coordination ability towards f elements and capability towards actinide/rare earth separation. Uranyl cation forms 1:1 and 1:2 (M:L) complexes with a tetra-phosphinoylated p-tert-butylcalix[4]arene, B{sub 4}bL{sup 4}: UO{sub 2}(NO{sub 3}){sub 2}(B{sub 4}bL{sup 4}){sub n} . xH{sub 2}O (n = 1, x = 2, 1; n = 2, x = 6, 2). Spectroscopic data point to the inner coordination sphere of 1 containing one monodentate nitrate anion, one water molecule and the four phosphinoylated arms bound to UO{sub 2}{sup 2+} while in 2, uranyl is only coordinated to calixarene ligands. In both cases the U(VI) ion is 8-coordinate. Uranyl complexes display enhanced metal-centred luminescence due to energy transfer from the calixarene ligands; the luminescence decays are bi-exponential with associated lifetimes in the ranges 220 {mu}s < {tau}{sub s} < 250 {mu}s and 630 {mu}s < {tau}{sub L} < 640 {mu}s, pointing to the presence of two species with differently coordinated calixarene, as substantiated by a XPS study of U(4f{sub 5/2,7/2}), O(1s) and P(2p) levels on solid state samples. The extraction study of UO{sub 2}{sup 2+} cation and trivalent rare-earth (Y, La, Eu) ions from acidic nitrate media by B{sub 4}bL{sup 4} in chloroform shows the uranyl cation being much more extracted than rare earths. (orig.)

  8. A ditopic calix[6]arene ligand with N-methyl-imidazole and 1,2,3-triazole substituents: Synthesis and coordination with Zn(II) cations

    Czech Academy of Sciences Publication Activity Database

    Colasson, B.; Save, M.; Milko, Petr; Roithová, Jana; Schröder, Detlef; Reinaud, O.

    2007-01-01

    Roč. 9, č. 24 (2007), s. 4987-4990. ISSN 1523-7060 R&D Projects: GA AV ČR KJB400550704 Grant ostatní: CNRS(FR) ANR-05-BLAN-0003 Institutional research plan: CEZ:AV0Z40550506 Keywords : calixarenes * mass spectroscopy * supramolecular chemistry * zinc Subject RIV: CF - Physical ; Theoretical Chemistry Impact factor: 4.802, year: 2007

  9. Solid-phase Microextraction with Benzoxy-calix[6]arene Fiber Coupled to Gas Chromatography for the Analysis of Polycyclic Aromatic Hydrocarbons in Water

    Institute of Scientific and Technical Information of China (English)

    YE Chang-wen; ZHANG Xue-na; HUANG Jiang-yan; LI Xiu-juan; PAN Si-yi

    2011-01-01

    Headspace solid-phase microextraction(HS-SPME) with sol-gel calix[6]arene-containing fiber followed by gas chromatography with a flame ionization detector was used to examine the composition and distribution of seven polycyclic aromatic hydrocarbons(PAHs) in water. The novel SPME fiber exhibited higher extraction efficien cy to PAHs compared with poly(dimethylsiloxane) and other calixarene-containing fibers. Extraction/retention me chanism based on the interactions between calixarenes and PAHs was discussed. Owing to the good selectivity and high extraction capability of this calixarene fiber, low detection limits were obtained in a range of 0.34—6.50 ng/L and the relative standard deviation values were ≤ 12.3% for all of the analytes. The linear ranges of the proposed method were five orders of magnitude for the tested compounds, with linear correlation coefficients(r) greater than 0.998. The method was applied to the determination of polycyclic aromatic hydrocarbons in nine water sources in Wuhan City, China. Standard addition method was selected for the quantification and the recovery values were in a satisfactory range. Total PAHs concentrations in the nine surface water samples were found to vary between unde tectable and 8.840 μg/L with two-and three-ring PAHs predominating.

  10. Synthesis of Ag nanoparticles for the electrochemical detection of anticancer drug flutamide

    Institute of Scientific and Technical Information of China (English)

    Farzaneh Ahmadi; Jahan Bakhsh Raoof; Reza Ojani; Mehdi Baghayeri; Moslem Mansour Lakouraj; Hamed Tashakkorian

    2015-01-01

    Ag nanoparticles were synthesized on the surface of a glassy carbon electrode modified with p‐tert‐butylcalix[4]arene and p‐tert‐butylcalix[6]arene by the deposition of Ag+at an open circuit potential followed by the electrochemical reduction of the Ag+. The presence of the calixarene layer on the electrode surface controlled the particle size and prevented agglomeration. Cyclic voltam‐metry showed that the Ag nanoparticles on the modified glassy carbon electrode had good catalytic ability for the reduction of flutamide. The effects of calixarene concentration, potential applied for the reduction of Ag+, number of calixarene layers, and pH value on the electrocatalytic activity of the Ag nanoparticles were investigated. The modified electrode had a linear range in differential pulse voltammetry of 10−1000 µmol/L with a detection limit of 9.33 µmol/L for flutamide at an S/N=3. The method was applied to the detection of flutamide in practical samples.

  11. Crystal structure of the inclusion complex 25-benzo-ylmeth-oxy-5,11,17,23-tetra-tert-butyl-26,27,28-trihy-droxy-2,8,14,20-tetra-thia-calix[4]arene-tetra-ethyl-ammonium chloride (1/1).

    Science.gov (United States)

    Akkurt, Mehmet; Jasinski, Jerry P; Mohamed, Shaaban K; Omran, Omran A; Albayati, Mustafa R

    2015-11-01

    The asymmetric unit of the title compound, C48H54O5S4·N(C2H5)4 (+)·Cl(-), contains two tetra-tert-butyl-[(benzo-yl)meth-oxy]-trihy-droxy-tetra-thia-calix[4]arene mol-ecules, two tetra-ethyl-ammonium cations and two chloride anions. The two calixarene molecules in the asymmetric unit each display a cone conformation. There are no significant differences between the two independent molecules. The guest species do not sit within the calixarene 'buckets'. In the crystal, extensive O-H⋯O, O-H⋯S and O-H⋯Cl hydrogen bonds and weak C-H⋯O, C-H⋯S and C-H⋯Cl inter-actions link the thia-calixarene mol-ecules, tetra-ethyl-ammonium cations and chloride anions, forming a three-dimensional network encompassing channels running parallel to the a-axis direction. The structure contains a solvent-accessible void of 76 (3) Å(3), but no solvent mol-ecule could reasonably be located. The crystal studied was an inversion twin with a 0.57 (8):0.43 (8) domain ratio. PMID:26594550

  12. Rare earth (Eu3+, Tb3+) mesoporous hybrids with calix[4]arene derivative covalently linking MCM-41: Physical characterization and photoluminescence property

    International Nuclear Information System (INIS)

    MCM-41 mesoporous silica has been functionalized with two kinds of macrocylic calixarene derivatives Calix[4] and Calix[4]Br (Calix[4]=P-tert-butylcalix[4]arene, Calix[4]Br=5.11,17.23-tetra-tert-butyl-25.27-bihydroxy- 26.28-bibromopropoxycalix[4]arene) through condensation approach of tetraethoxysilane (TEOS) in the presence of the cetyltrimethylammonium bromide (CTAB) surfactant as a template. Novel organic-inorganic mesoporous luminescent hybrid containing RE3+ (Eu3+, Tb3+) complexes covalently attached to the functionalized ordered mesoporous MCM-41, which are designated as RE-Calix[4]-MCM-41 and RE-Calix[4]Br-MCM-41, respectively, are obtained by sol-gel process. It is found that they all have high surface area, uniform in the mesostructure and good crystallinity. Measurement of the photoluminescence properties show the mesoporous material covalently bonded Tb3+ complexes (Tb-Calix[4]-MCM-41 and Tb-Calix[4]Br-MCM-41) exhibit the stronger characteristic emission of Tb3+ and longer lifetime than the corresponding Eu-containing materials Eu-Calix[4]-MCM-41 and Eu-Calix[4]Br-MCM-41 due to the triplet state energy of modified organic ligands Calix[4]-Si and Calix[4]Br-Si match with the emissive energy level of Tb3+ very well. - Graphical abstract: MCM-41 mesoporous silica is functionalized with two kinds of macrocylic calixarene derivatives and luminescent organic-inorganic mesoporous hybrids containing Ln3+ complexes covalently attached to the functionalized ordered mesoporous MCM-41. Highlights: → Novel linkages of functionalized calixarene derivative. → New rare earth mesoporous hybrids. → Luminescence in visible region.

  13. Cobalt bis(dicarbollide) ions with covalently bonded CMPO groups as selective extraction agents for lanthanide and actinide cations from highly acidic nuclear waste solutions

    Czech Academy of Sciences Publication Activity Database

    Grüner, Bohumír; Plešek, Jaromír; Báča, Jiří; Císařová, I.; Dozol, J. F.; Rouquette, H.; Vinas, C.; Selucký, P.; Rais, J.

    2002-01-01

    Roč. 26, č. 10 (2002), s. 1519-1527. ISSN 1144-0546 R&D Projects: GA ČR GA104/99/1096; GA ČR GA104/01/0142; GA ČR GA203/99/M037; GA MŠk LN00A028 Institutional research plan: CEZ:AV0Z4032918 Keywords : LIQUID-CHROMATOGRAPHIC SEPARATIONS * BORON-CLUSTER COMPOUNDS * CALIXARENES Subject RIV: CA - Inorganic Chemistry Impact factor: 2.060, year: 2002

  14. Synthesis and cationic selectivity studies of novel calix[4]arene derivatives containing heteroatom at the lower rim

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    A series of calixarene derivatives 2-5 containing heteroatom at the lower rim have been synthesized. 1H NMR studies and crystallographic structures demonstrated that the calix[4]arene derivatives adopted cone conformations. Their cationic binding abilities and selectivities towards heavy and transition metal ions have been evaluated by solvent extraction of aqueous metal picrates. The obtained results indicated that the introduction of nitrogen, sulfur, and/or phosphor atoms to the calix[4]arene framework could effectively enhance their binding ability and selectivity for heavy and transition metal ions, such as Pb2+ or Ag+.

  15. The Use of Self-Assembled Monolayer of Thiolated Calix[4]arene on Polycrystaline Gold Electrode Surface

    Czech Academy of Sciences Publication Activity Database

    Hrdlička, V.; Navrátil, Tomáš; Šestáková, Ivana; Barek, J.; Ludvík, Jiří

    Ústí nad Labem: Srsenová Lenka - Best Servis, 2015 - (Navrátil, T.; Fojta, M.; Schwarzová, K.), s. 69-71 ISBN 978-80-905221-3-8. [Moderní elektrochemické metody /35./. Jetřichovice (CZ), 18.05.2015-22.05.2015] R&D Projects: GA ČR GA13-21704S; GA ČR(CZ) GAP208/12/1645 Institutional support: RVO:61388955 Keywords : calixarene * thiols * gold electrode Subject RIV: CF - Physical ; Theoretical Chemistry

  16. Elaboration of hybrid organic-inorganic materials for ammonium ions retention: Electron microscopy bipolarized observations and 129Xe solid-state NMR

    International Nuclear Information System (INIS)

    Translucent organic-inorganic hybrid porous silica materials have been prepared via the acid-catalysed hydrolysis and condensation of TEOS and various p-sulphonatocalix[n]arene derivatives. Xerogels and aerogels have been prepared. The morphology of the gels was characterized by electron microscopy (SEM and ESEM) and by hyperpolarized 129Xe NMR. The aerogels showed a porous structure not influenced by the size of the calixarene derivative incorporated in the gel. The efficiency of these new materials towards the retention of ammonium ions was discussed

  17. Molecular engineering and fluorescence for the detection of toxic cations

    International Nuclear Information System (INIS)

    This work is a part of the 'Toxicologie Nucleaire Environnementale' program which aims at studying the effects on the living of heavy metals or radionuclides involved in nuclear industry. Most particularly, it deals with the design of new fluorescent sensors for the selective detection of Pb2+, Cd2+ and Cs+ in biological media. Several fluorescent calixarenes possessing nitrogen atoms were synthesized and their properties as potential lead sensors were investigated. One of them could be used in experimental conditions close to biological media and new target compounds with amide functional groups were proposed. Many approaches were considered for the design of selective fluorescent sensors for cadmium. On the basis of literature results, many chelating compounds incorporating sulfur atoms were synthesized but showed no significant affinity towards cadmium. On the opposite, compounds functionalized with several pyridine-2'-yl-1,2,3-triazol fluorescent moieties linked to a β-cyclodextrin or a calix[4]arene showed good affinity for cadmium in methanol, but the selectivity was found to be insufficient. In contrast, very satisfying results in terms of both selectivity and sensitivity could be obtained with the commercial calcium sensor Rhod-5N in an aqueous medium at neutral pH. Lastly, micromolar detection limits for the selective detection of caesium were reached in an aqueous medium at neutral pH thanks to a new sulfonated fluorescent calixarene with two appended crown-ethers. An original complexation mechanism was proposed and validated by molecular modelling (DFT). (author)

  18. Studies of extractant molecules in solution and at liquid-liquid interfaces: structural and mechanistic aspects of synergy effects

    International Nuclear Information System (INIS)

    Molecular dynamics simulations reported herein provide new important insights into cation recognition and complexation in solution as well as liquid-liquid extraction, with a particular focus on the microscopic events taking place at the interface between two immiscible liquids. Preliminary studies concerned the representation of the trivalent rare earth cations La3+, Eu3+ and Yb3+ in force field simulations, probing structural and energetic features on an experimentally characterized model system based on substituted pyridine dicarboxamide ligands. Complexation of such cations by a novel calixarene derivative was investigated showing unexpected features, such as the position of the cation in the complex. Independent experimental studies published subsequently support these findings. Another part of the work is related to industrial liquid-liquid extraction systems using tri-n-butyl phosphate (TBP) as co-solvent, extractant, surfactant and synergist. We investigate 1) concentration effects simulating up to 60 TBP at a water/chloroform interface, 2) acidity using a neutral and ionic model of HNO3 and 3) synergistic aspects of mixed TBP/calixarene extraction systems. These simulations provide the first microscopic insights into such issues. We finally addressed the topic of solute transfer across the water/chloroform interface. The potential of mean force for such a process has been calculated by both standard methods and novel approaches

  19. Supramolecular solubilization of fullerenes and radio-fullerenes in aqueous media

    International Nuclear Information System (INIS)

    In this paper we are dealing with the supramolecular complexation of fullerenes C60, C70, some functionalized fullerenes and of the dumbbell structured C120 dimer, with two host molecules, namely γ-cyclo-dextrin (GCD), and sulfocalix[8]arene in order to make them soluble in water. Previous investigations by others have shown that the reactions of some mentioned fullerenes and cyclo-dextrins and calixarenes are very slow and tedious in liquid phase as a result of solvatation effects. That we have decided to pursue the supramolecular complexation as solid-solid reactions by using mechanochemical activation in a ball mill. A mechanochemical treatment was used to enhance chemical reactivity in solid-solid reactions in which GCD give a complex with the C60 as 2:1 host-guest complex. The calix[8]arene complex with C60 molecule has been prepared. The sulfonated form of the host is well soluble in water. Endohedral radio-fullerenes of the XandC60 type (where *X is a rare gas, e.g. Ar, Xe, Kr, radionuclide) were prepared by nuclear recoil after neutron irradiation, a method developed by the author The endohedrally labelled fullerenes were then mechanochemically complexed into a labelled supramolecular complex with cyclo-dextrin and calixarene hosts. (author)

  20. Thermodynamics of host-guest complexation between p-sulfonatocalixarenes and 1-alkyl-3-methylimidazolium type ionic liquids

    International Nuclear Information System (INIS)

    Highlights: → 1-Alkyl-3-methylimidazolium binding to sulfonatocalix[4,6]arenes is enthalpy driven. → Lengthening of the alkyl group of the guest leads to small change in ΔH and ΔS. → Binding enthalpy is independent on the size of the calixarene macrocycle. → Entropy decrease is more substantial for confinement in sulfonatocalix[6]arene. → Driving force of inclusion in sulfonatocalix[6]arene is more sensitive to pH. - Abstract: The binding of 1-alkyl-3-methylimidazolium ions (Cnmim+) to p-sulfonato-substituted calix[4]arene (SCX4) and calix[6]arene (SCX6) was studied by isothermal titration calorimetry in aqueous solution at 298 K. The complexation had 1:1 stoichiometry and was enthalpy driven for all cations. The equilibrium constants of inclusion were determined at pH 6.5 and compared to those previously reported at pH 2. The driving force of encapsulation showed smaller pH dependence for SCX4 than for SCX6. The binding enthalpy changed only slightly when the 1-alkyl moiety of the imidazolium ring was lengthened and did not depend on the size of the calixarene macrocycle. The complexation with SCX4 caused smaller entropy loss and steeper linear enthalpy-entropy correlation.

  1. Electrochemistry of tert-Butylcalix[8]arene-C(60) Films Using a Scanning Electrochemical Microscope-Quartz Crystal Microbalance.

    Science.gov (United States)

    Cliffel, D E; Bard, A J; Shinkai, S

    1998-10-01

    The electrochemical reduction of tert-butylcalix[8]arene-C(60) particle films was studied using the scanning electrochemical microscope combined with a quartz crystal microbalance (QCM) for several electrolytes in MeCN. Complexation of the fullerene within the film results in a negative shift of the peak potential of the first cathodic wave by about 400 mV compared to the reduction of a pure C(60) film. The QCM indicates a mass loss during reduction of the film. Even in electrolytes where C(60) anions normally remain in the surface film, a loss of fullerene electrochemical activity occurs. The complex breaks apart upon reduction of the fullerene center, with the fullerene escaping from the calixarene basket into the MeCN solution, leaving the calixarene as an insoluble film on the electrode surface. These results show that the π electron sharing of the complex is decreased by the additional electron density added to the fullerene by reduction to C(60)(-). PMID:21651251

  2. Extraction of americium and europium by CMPO-substituted adamantylcalixarenes

    International Nuclear Information System (INIS)

    Eight p-adamantylcalix[4]arene derivatives, bearing four CMPO-like functions [-(CH2)n-NH-C(O)-CH2-P(O)Ph2] at the wide (4a,b, n = 0, 1) or narrow (5a-c and 6a-c, n = 2-4) rims were synthesized for the first time. Studies of the extraction of americium(III) and europium(III) from 3 M HNO3 solutions to organic phases (dichloromethane, m-nitro-trifluoromethylbenzene) showed: (i) The extraction ability for all the adamantylcalixarene ligands is much better than for their monomeric analogues -N-(1-adamantyl)-, N-(1-adamantylmethyl)- and N,N-(dibutyl)carbamoylmethyldiphenylphosphine oxides 7a, 7b, 8; (ii) The extraction percentage increases strongly with increasing length of the spacer for all types of ligands 4-6, and best extraction results were found for 4b (n = 1) and 5c (n = 4); (iii) The separation coefficient DAm/DEu for the investigated compounds did not exceed 2, which is close to the narrow rim CMPO calixarenes, studied earlier; (iv) Variation of the spacer length between CMPO groups attached to the 1,3- and 2,4-positions of the calixarene platform in 6 did not lead to appreciably improved extractants, neither with respect to the extraction abilities (D) nor to the selectivities (DAm/DEu). (orig.)

  3. Investigation of the mechanism of formation of overbased detergents

    International Nuclear Information System (INIS)

    This thesis describes an experimental study of calixarate overbased detergent oil additives, used to neutralise acidic by-products of engine combustion. Aspects of interest in this study include experimental synthesis of calixarenes and overbased detergents, physical and structural characterisation and monitoring of the synthesis process. Two types of calixarenes were prepared (6 and 8 phenolic units). A synthesis procedure of the calixarate overbased detergent was set up, based on adaptation of existing procedures used for other classes of overbased detergents. The procedure was also modified to suit a lab-scale. 13C NMR and UV-Vis spectroscopy have provided strong evidence for a precursor of the overbased detergent. The ionisation of the surfactants (stearic acid carboxylic group, and phenolic units) was clearly established. The synthesis process was monitored at the molecular and macroscopic level. The use of 13C-labelled compounds enabled a semi-quantitative study of the concentration evolution of each chemical during the synthesis. Langmuir- trough measurements and dynamic light scattering showed a decrease of particle size during the synthesis of the overbased detergent. The final calixarate overbased detergent was then fully characterised by these two methods. Based on the various information gathered (starting and final material characterisation, monitoring of the process), a mechanism was suggested. This involved a progressive solvation of calcium hydroxide, and breakdown of mixed calcium hydroxide and calcium carbonate. (author)

  4. Thermal decomposition mechanism of p-tert-butyl-calix[n]arenes

    Energy Technology Data Exchange (ETDEWEB)

    Chennakesavulu, K., E-mail: chennanml@yahoo.com [National Metallurgical Laboratory Madras Centre, CSIR Madras Complex, Taramani, Chennai 600 113 (India); Department of Chemistry, Sathyabama University, Jeppiaar Nagar, Chennai 600 119 (India); Sreedevi, P.; Raviathul Basaria, M. [National Metallurgical Laboratory Madras Centre, CSIR Madras Complex, Taramani, Chennai 600 113 (India); Ramanjaneya Reddy, G. [Department of Inorganic Chemistry, Guindy Campus, University of Madras, Chennai 600 025 (India); Sasipraba, T. [International Research Centre, Sathyabama University, Jeppiaar Nagar, Chennai 600 119 (India); Bhaskar Raju, G.; Prabhakar, S. [National Metallurgical Laboratory Madras Centre, CSIR Madras Complex, Taramani, Chennai 600 113 (India)

    2014-01-10

    Highlights: • Systematic thermal decomposition, structural elucidation of intermediates at various quenched temperatures. • At solid state the phenolic free radical was quenched and was evidenced by recording stable EPR. • Since the lower decomposition energy these p-tert-butyl-calix[n]arenes can be used as a antioxidants for thermal stabilization of polyolefins. • Solid state NMR CP-MAS studies show the breakage of calixarene at bridged methylene. • Kinetic triplets of p-tert-butyl-calixarenes were determined by model free methods. - Abstract: Thermal decomposition of p-tert-butyl-calix[n]arene was studied using thermo gravimetry (TG) and differential thermo gram (DTG) methods. Non-isothermal TG was done under static air atmosphere with 1, 2.5, 5.0 and 10.0 K/min. Model-free methods such as Friedman and Flynn Wall Ozawa (FWO) were used to evaluate the kinetic parameters such as activation energy and exponential factors. The probable thermal decomposition mechanism was proposed by analyzing the quenched intermediate p-tert-butyl-calix[n]arene samples with FTIR, mass, {sup 1}H NMR, {sup 13}C NMR cross polarization magic angle spectrometry (CP-MAS), EPR spectroscopy and elemental analysis. The thermal stability of the polyolefins was checked with p-tert-butyl-calix[n]arene as an antioxidant additive.

  5. Crystal structure of the inclusion complex 25-benzoylmethoxy-5,11,17,23-tetra-tert-butyl-26,27,28-trihydroxy-2,8,14,20-tetrathiacalix[4]arene–tetraethylammonium chloride (1/1

    Directory of Open Access Journals (Sweden)

    Mehmet Akkurt

    2015-11-01

    Full Text Available The asymmetric unit of the title compound, C48H54O5S4·N(C2H54+·Cl−, contains two tetra-tert-butyl-[(benzoylmethoxy]-trihydroxy-tetrathiacalix[4]arene molecules, two tetraethylammonium cations and two chloride anions. The two calixarene molecules in the asymmetric unit each display a cone conformation. There are no significant differences between the two independent molecules. The guest species do not sit within the calixarene `buckets'. In the crystal, extensive O—H...O, O—H...S and O—H...Cl hydrogen bonds and weak C—H...O, C—H...S and C—H...Cl interactions link the thiacalixarene molecules, tetraethylammonium cations and chloride anions, forming a three-dimensional network encompassing channels running parallel to the a-axis direction. The structure contains a solvent-accessible void of 76 (3 Å3, but no solvent molecule could reasonably be located. The crystal studied was an inversion twin with a 0.57 (8:0.43 (8 domain ratio.

  6. Electrochemical synthesis of Ag nanoparticles supported on glassy carbon electrode by means of p-isopropyl calix[6]arene matrix and its application for electrocatalytic reduction of H2O2

    International Nuclear Information System (INIS)

    The silver nanoparticles were prepared on the glassy carbon (GC) electrode, modified with p-iso propyl calix[6]arene, by preconcentration of silver ions in open circuit potential and followed by electrochemical reduction of silver ions. The stepwise fabrication process of Ag nanoparticles was characterized by scanning electron microscopy and electrochemical impedance spectroscopy. The prepared Ag nanoparticles were deposited with an average size of 70 nm and a homogeneous distribution on the surface of electrode. The observed results indicated that the presence of calixarene layer on the electrode surface can control the particle size and prevent the agglomeratione and electrochemical deposition is a promising technique for preparation of nanoparticles due to its easy-to-use procedure and low cost of implementation. Cyclic voltammetry experiments showed that Ag nanoparticles had a good catalytic ability for the reduction of hydrogen peroxide (H2O2). The effects of p-isopropyl calix[6]arene concentration, applied potential for reduction of Ag+, number of calixarene layers and pH value on the electrocatalytic ability of Ag nanoparticles were investigated. The present modified electrode exhibited a linear range from 5.0 × 10-5 to 6.5 × 10-3 M and a detection limit 2.7 × 10-5 M of H2O2 (S/N = 3) using amperometric method.

  7. Development of Conductometric Sensor Based on 25,27-Di-(5-thio-octyloxy)calix[4]arene-crown-6 for Determination of Ammonium.

    Science.gov (United States)

    Saiapina, O Y; Kharchenko, S G; Vishnevskii, S G; Pyeshkova, V M; Kalchenko, V I; Dzyadevych, S V

    2016-12-01

    The conductometric sensor based on 25,27-di-(5-thio-octyloxy)calix[4]arene-crown-6 was developed for the quantitative analysis of ammonium. The calixarene was immobilized on the surface of the planar interdigitated electrodes by attachment of its dialkyl sulfide groups to the surface of the gold electrodes. The intrinsic ability of the calixarene to capture ammonium was studied in the conductometric measuring mode and by the electrochemical impedance spectroscopy. The developed sensor showed high selectivity to ammonium in the presence of mono-, di-, and trivalent cations. Selective and highly sensitive detection of ammonium resulted from the complexation between the ammonium ions and a crown-ether fragment of the upper rim of the 25,27-di-(5-thio-octyloxy)calix[4]arene-crown-6 macrocycle. The developed sensor had high signal repeatability. Its sensitivity was found to be satisfactory for the forthcoming sensor application in the water-sample analysis; the linear range was 0.01-1.5 mM and limit of detection 10 μM. PMID:26911569

  8. Inhibition of histone binding by supramolecular hosts

    Science.gov (United States)

    Allen, Hillary F.; Daze, Kevin D.; Shimbo, Takashi; Lai, Anne; Musselman, Catherine A.; Sims, Jennifer K.; Wade, Paul A.; Hof†, Fraser; Kutateladze, Tatiana G.

    2015-01-01

    The tandem PHD (plant homeodomain) fingers of the CHD4 (chromodomain helicase DNA-binding protein 4) ATPase are epigenetic readers that bind either unmodified histone H3 tails or H3K9me3 (histone H3 trimethylated at Lys9). This dual function is necessary for the transcriptional and chromatin remodelling activities of the NuRD (nucleosome remodelling and deacetylase) complex. In the present paper, we show that calixarene-based supramolecular hosts disrupt binding of the CHD4 PHD2 finger to H3K9me3, but do not affect the interaction of this protein with the H3K9me0 (unmodified histone H3) tail. A similar inhibitory effect, observed for the association of chromodomain of HP1γ (heterochromatin protein 1γ) with H3K9me3, points to a general mechanism of methyl-lysine caging by calixarenes and suggests a high potential for these compounds in biochemical applications. Immunofluorescence analysis reveals that the supramolecular agents induce changes in chromatin organization that are consistent with their binding to and disruption of H3K9me3 sites in living cells. The results of the present study suggest that the aromatic macrocyclic hosts can be used as a powerful new tool for characterizing methylation-driven epigenetic mechanisms. PMID:24576085

  9. Amino acids separation with the tetracarboxylic derived of the para-ter-butylcalix[4]arene by means of solid-liquid extraction assisted with lanthanides

    International Nuclear Information System (INIS)

    The tetracarboxylic derived of the para-ter-butylcalix[4]arene (B4ACEbL4) does not exist commercially for what was synthesized and characterized at laboratory level. The separation of the L-tyrosine amino acid was studied by means of a solid-liquid extraction system with the B4ACEbL4 as solid phase, in function of ph (2.5-7.5) and contact time (5 and 15 hours) to temperature of 15-17 grades C. Resulted that the ph and the contact time were decisive in the extraction percentage of water tyrosine. The lowest percentage was 49% to ph 4 and the highest percentage was 61% to ph 7.5 with 15 hours of contact. In a contact time of 5 hours the extraction was inferior to 32% (ph 4) and of 47% to ph 6.5. The europium effect (Eu (III)) was studied to ph acid in the tyrosine separation and was found that the tyrosine extraction is not increased neither decomposes in europium presence, this is simultaneously extracted by the calixarene but it does not enter in competition for the calixarene with the amino acid. The separate solid phases: calixarene-tyrosine was analyzed by Far infrared radiation (Fir), Mid-Infrared (Mir) spectroscopy and luminescence to check the tyrosine presence in the separate solids as well as the nature of the connection calixarene-tyrosine. In this way was possible to check the tyrosine presence and to propose the formed molecular species tyrosine-calixarene, those which interact mainly by means of hydrogen connections and Van der Waals forces. The liquid phases before and after the extraction were analyzed by UV-Vis spectrophotometry and luminescence. The Neutron activation analysis was used to determine the europium content in the solid and liquid phases of extractions in europium presence. The tyrosine degradation also shows dependence with the ph, obtaining 88% degradation to the 24 hours to ph 7.5, while to ph 3 is degraded the 54% of tyrosine present in the sample. The europium presence does not affect the tyrosine extraction but if its photo

  10. Amino acids separation with the tetracarboxylic derived of the para-ter-butylcalix[4]arene by means of solid-liquid extraction assisted with lanthanides; Separacion de aminoacidos con el derivado tetracarboxilico del para-ter-butilcalix[4]areno mediante extraccion solido-liquido asistida con lantanidos

    Energy Technology Data Exchange (ETDEWEB)

    Bernal R, R. del C.

    2014-07-01

    The tetracarboxylic derived of the para-ter-butylcalix[4]arene (B{sub 4}ACEbL{sup 4}) does not exist commercially for what was synthesized and characterized at laboratory level. The separation of the L-tyrosine amino acid was studied by means of a solid-liquid extraction system with the B{sub 4}ACEbL{sup 4} as solid phase, in function of ph (2.5-7.5) and contact time (5 and 15 hours) to temperature of 15-17 grades C. Resulted that the ph and the contact time were decisive in the extraction percentage of water tyrosine. The lowest percentage was 49% to ph 4 and the highest percentage was 61% to ph 7.5 with 15 hours of contact. In a contact time of 5 hours the extraction was inferior to 32% (ph 4) and of 47% to ph 6.5. The europium effect (Eu (III)) was studied to ph acid in the tyrosine separation and was found that the tyrosine extraction is not increased neither decomposes in europium presence, this is simultaneously extracted by the calixarene but it does not enter in competition for the calixarene with the amino acid. The separate solid phases: calixarene-tyrosine was analyzed by Far infrared radiation (Fir), Mid-Infrared (Mir) spectroscopy and luminescence to check the tyrosine presence in the separate solids as well as the nature of the connection calixarene-tyrosine. In this way was possible to check the tyrosine presence and to propose the formed molecular species tyrosine-calixarene, those which interact mainly by means of hydrogen connections and Van der Waals forces. The liquid phases before and after the extraction were analyzed by UV-Vis spectrophotometry and luminescence. The Neutron activation analysis was used to determine the europium content in the solid and liquid phases of extractions in europium presence. The tyrosine degradation also shows dependence with the ph, obtaining 88% degradation to the 24 hours to ph 7.5, while to ph 3 is degraded the 54% of tyrosine present in the sample. The europium presence does not affect the tyrosine extraction

  11. Selective extraction of cesium: from compound to process

    International Nuclear Information System (INIS)

    Under the French law of 30 December 1991 on nuclear waste management, research is conducted to recover long-lived fission products from high-level radioactive effluents generated by spent fuel reprocessing, in order to destroy them by transmutation or encapsulate them in specific matrices. Cesium extraction with mono and bis-crown calix(4)arenes (Frame 1) is a candidate for process development. These extractants remove cesium from highly acidic or basic pH media even with high salinity. A real raffinate was treated in 1994 in a hot cell to extract cesium with a calix-crown extractant. The success of this one batch experiment confirmed the feasibility of cesium decontamination from high-level liquid waste. It was then decided to develop a process flowchart to extract cesium selectively from high-level raffinate, to be included in the general scheme of long-lived radionuclide partitioning. It was accordingly decided to develop a process based on liquid-liquid extraction and hence optimize a calixarene/diluent solvent according to: - hydraulic properties: density, viscosity, interfacial tension, - chemical criteria: sufficient cesium extraction (depending on the diluent), kinetics, third phase elimination... New mono-crown-calixarenes branched with long aliphatic groups (Frame 2) were designed to be soluble in aliphatic diluents. To prevent third phase formation associated with nitric acid extraction, the addition of modifiers (alcohol, phosphate and amide) in the organic phase was tested (Frame 3). Table 1 shows examples of calixarene/diluent systems suitable for a process flowchart, and Figure 2 provides data on cesium extraction with these new systems. Alongside these improvements, a system based on a modified 1,3-di(n-octyl-oxy)2,4-calix[4]arene crown and a modified diluent was also developed, considering a mixed TPH/NPHE system as the diluent, where TPH (hydrogenated tetra propylene) is a common aliphatic industrial solvent and NPHE is nitrophenyl

  12. Study of electrochemical phosphate sensing systems: Spectrometric, potentiometric and voltammetric evaluation

    Energy Technology Data Exchange (ETDEWEB)

    Kivlehan, Francine [Tyndall National Institute, Lee Maltings, University College, Cork (Ireland); Mace, Wade J. [Tyndall National Institute, Lee Maltings, University College, Cork (Ireland); Department of Chemistry, Analytical and Biological Chemistry Research Facility, University College, Cork (Ireland); Moynihan, Humphrey A. [Department of Chemistry, Analytical and Biological Chemistry Research Facility, University College, Cork (Ireland); Arrigan, Damien W.M. [Tyndall National Institute, Lee Maltings, University College, Cork (Ireland)], E-mail: damien.arrigan@tyndall.ie

    2009-02-28

    Characterization of the interaction of a urea-functionalized calix[4]arene ionophore and phosphate was undertaken by combination of nuclear magnetic resonance (NMR) spectrometry, potentiometric selectivity coefficient evaluation and voltammetric ion transfer at the interface between two immiscible electrolyte solutions (ITIES). NMR revealed that the urea protons were involved in complexation with the target anion and potentiometric separate solution selectivity data indicated selectivity for phosphate over chloride and sulphate. Voltammetry at the ITIES confirmed that the ionophore-facilitated transfer of monohydrogen phosphate occurred in preference to dihydrogen phosphate transfer. The results correlate with previously reported data on the potentiometric evaluation of this calixarene as an anionophore in PVC-membrane electrodes. The data provide the basis for development of amperometric monohydrogen phosphate sensors based on the ion-transfer principle.

  13. Computational study of small molecule binding for both tethered and free conditions

    CERN Document Server

    Ytreberg, F Marty

    2009-01-01

    Using a calix[4]arene-benzene complex as a test system we compare the potential of mean force for when the calix[4]arene is tethered versus free. When the complex is in vacuum our results show that the difference between tethered and free is primarily due to the entropic contribution to the potential of mean force resulting in a binding free energy difference of 6.5 kJ/mol. By contrast, when the complex is in water our results suggest that the difference between tethered and free is due to the enthalpic contribution resulting in a binding free energy difference of 1.6 kJ/mol. This study elucidates the roles of entropy and enthalpy for this small molecule system and emphasizes the point that tethering the receptor has the potential to dramatically impact the binding properties. These findings should be taken into consideration when using calixarene molecules in nanosensor design.

  14. Highly selective fluorescent chemosensor for Na~+ based on pyrene-modified calix[4]arene derivative

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    A novel calix[4]arene derivative with pyrene fluorophores at the upper rim and tetraester ionophores at the lower rim was synthesized in six steps,and its structure was proved by NMR and ESI-MS spectro-scopies. Furthermore,the chemosensing behavior of the host compound for alkali and alkaline earth metal ions was investigated by fluorescence spectroscopy. The obtained results show that the calix-arene host can selectively bind sodium ion with the complexation stability constant of 2190 mol-1.L. The complexation with sodium ion can pronouncedly induce the excimer emission to decrease and the monomer emission to increase,whereas the addition of the other alkali and alkaline earth metal ions does not cause appreciable changes in the fluorescence spectrum of the host compound. The present calix[4]arene derivative displays potential application as fluorescent chemosensor for sodium ion.

  15. Highly selective fluorescent chemosensor for Na+ based on pyrene-modified calix[4]arene derivative

    Institute of Scientific and Technical Information of China (English)

    WANG KeRang; GUO DongSheng; JIANG BangPing; LIU Yu

    2009-01-01

    A novel calix[4]arene derivative with pyrene fluorophores at the upper rim and tetraester ionophores at the lower rim was synthesized in six steps, and its structure was proved by NMR and ESi-MS spectro-scopies. Furthermore, the chemosensing behavior of the host compound for alkali and alkaline earth metal ions was investigated by fluorescence spectroscopy. The obtained results show that the calix-arene host can selectively bind sodium ion with the complexation stability constant of 2190 mol-1.L. The complexation with sodium ion can pronouncedly induce the excimer emission to decrease and the monomer emission to increase, whereas the addition of the other alkali and alkaline earth metal ions does not cause appreciable changes in the fluorescence spectrum of the host compound. The present calix[4]arene derivative displays potential application as fluorescent chemosensor for sodium ion.

  16. Methylene crosslinked calix[6]arene hexacaarboxylic acid resin: a highly efficient solid phase extractant for decontamination of lead bearing effluents.

    Science.gov (United States)

    Adhikari, Birendra Babu; Gurung, Manju; Kawakita, Hidetaka; Jumina; Ohto, Keisuke

    2011-10-15

    Calixarene-based cation exchange resin has been developed by methylene crosslinking of calix[6]arene hexacarboxylic acid derivative and the resin has been exploited for solid phase extraction of some toxic heavy metal ions. The selectivity order of the resin towards some metal ions follows the order Pb(II) > Cu(II)> Zn(II), Ni(II), Co(II). The maximum lead ion binding capacity of the resin was found to be 1.30 mmol g(-1) resin. The loaded lead was quantitatively eluted with dilute acid solution regenerating the resin. Mutual separation of Pb(II), Cu(II) and Zn(II) was achieved by using the column packed with the resin. PMID:21835544

  17. Selective Electrochemical Recognition of o-Phenylenediol by a Novel Calix[4]arene Derivative

    Institute of Scientific and Technical Information of China (English)

    L(U), Jian-Quan; ZHANG, Hai-Li; LU, Ping

    2007-01-01

    A new type of calixarene-modified electrode has been prepared by directly coating the surface of a glassy carbon electrode with tetrahydrofuran solution containing 25,26,27,28-tetra-(3-amidino thiopropoxy)-5,11,17,23-tetratert-butylcalix[4]arene, and applied to the investigation of electrochemical behavior of phenylenediols. The results showed that the modified electrode could selectively recognize o-phenylenediol, making the over-potential of o-phenylenediol dropped and peak current increased greatly. The anodic peak current is proportional to the concentration of o-phenylenediol in the range of 1.0 × 10-5-1.0 × 10-4 mol· L-1 with the detection limit (S/N= 3) of 1.0 ×10-7 mol·L-1. The recognizing mechanism, including electrochemical process and binging sites, was also discussed using voltammetry.

  18. Cyclodextrin-based microsensors for volatile organic compounds

    Energy Technology Data Exchange (ETDEWEB)

    Swanson, B.; Johnson, S.; Shi, J.; Yang, Xiaoguang

    1997-10-01

    Host-guest chemistry and self-assembly techniques are being explored to develop species selective thin-films for real-time sensing of volatile organic compounds (VOCs). Cyclodextrin (CD) and calixarene (CA) molecules are known to form guest-host inclusion complexes with a variety of organic molecules. Through the control of the cavity size and chemical functionality on the rims of these bucket-like molecules, the binding affinities for formation of inclusion complexes can be controlled and optimized for specific agents. Self-assembly techniques are used to covalently bond these reagent molecules to the surface of acoustic transducers to create dense, highly oriented, and stable thin films. Self-assembly techniques have also been used to fabricate multilayer thin film containing molecular recognition reagents through alternating adsorption of charged species in aqueous solutions. Self-assembly of polymeric molecules of the SAW device was also explored for fabricating species selective interfaces.

  19. Lanthanide Structures, Coordination, and Extraction Investigations of a 1,3-Bis(diethyl amide)-Substituted Calix[4]arene Ligand.

    Science.gov (United States)

    Beer, Paul D.; Drew, Michael G. B.; Kan, Mark; Leeson, Philip B.; Ogden, Mark I.; Williams, Gareth

    1996-04-10

    The synthesis and structure determinations of lanthanum, samarium, ytterbium, and lutetium complexes of 5,11,17,23-tetra-tert-butyl-25,27-bis((diethylcarbamoyl)methoxy)-26,28-dihydroxycalix[4]arene (L) are described. The four structures display similar characteristics with the trivalent lanthanide cation being encapsulated in an eight-coordinate oxygen environment, consisting of six oxygens from the calixarene, a water molecule, and unidentate picrate for lanthanum [La(L-2H)(picrate)(H(2)O)]; and bidentate chelating picrate for the other lanthanides [Ln(L-2H)(picrate)]Ln = Sm, Yb, Lu. Under optimised experimental conditions solvent extraction investigations showed the calix[4]arene ligand L exhibited generally very high percentage extractabilities of lanthanide cations into dichloromethane, presumably on account of the ligand's unique lower rim oxygen containing coordination sphere and its lipophilic exterior. PMID:11666414

  20. C-Methylcalix[4]resorcinarene–1,4-bis(pyridin-3-yl-2,3-diaza-1,3-butadiene (1/2

    Directory of Open Access Journals (Sweden)

    Konstantin A. Udachin

    2012-02-01

    Full Text Available In the title compound, 2C12H10N4·C32H32O8, the calixarene adopts a rctt conformation with dihedral angles of 138.40 (1 and 9.10 (1° between the opposite rings. The dihedral angles between the rings of the pyridine derivative are 8.80 (1 and 9.20 (1°. In the crystal, adjacent C-methylcalix[4]resorcinarene molecules are connected into columns parallel to [010] by O—H...O hydrogen bonds. O—H...N hydrogen bonds between the axial phenoxyl groups and bipyridine molecules link the columns into sheets parallel to (011, which are connected by O—H...N hydrogen bonds. Further O—H...N hydrogen bonds link the bipyridine and C-methylcalix[4]resorcinarene molecules, giving rise to a three-dimensional network.

  1. Characterization of an azo-calix[4]arene-based optical sensor for Europium (III) ions

    International Nuclear Information System (INIS)

    Selective and sensitive optical sensor membranes (optodes) were elaborated to detect cations in aqueous solutions. The sensing films are based on chromogenic calix[4]arene derivatives. The optode membranes were studied using UV/Vis absorption spectroscopy measurements. The sensitivity of the optode has been tested for Pb2+, Cd2+, Mg2+ and Eu3+ ions at pH 6.8. The results showed a good selectivity response towards Eu3+. Low selectivity coefficients were observed for Cd2+ and Mg2+ where Pb2+ can be considered as interfering ions. The characteristics of this optode such as response time, regeneration, reproducibility and lifetime are discussed. - Highlights: ► We report optical sensing studies of chromogenic calixarene derivatives. ► We investigate optical interaction between azo-calix[4]arene and Eu3+. ► We study sensitivity and selectivity of optode films. ► We describe characteristics of optode films for determination of europium traces.

  2. Molecular recognition of organic ammonium ions in solution using synthetic receptors

    Directory of Open Access Journals (Sweden)

    Andreas Späth

    2010-04-01

    Full Text Available Ammonium ions are ubiquitous in chemistry and molecular biology. Considerable efforts have been undertaken to develop synthetic receptors for their selective molecular recognition. The type of host compounds for organic ammonium ion binding span a wide range from crown ethers to calixarenes to metal complexes. Typical intermolecular interactions are hydrogen bonds, electrostatic and cation–π interactions, hydrophobic interactions or reversible covalent bond formation. In this review we discuss the different classes of synthetic receptors for organic ammonium ion recognition and illustrate the scope and limitations of each class with selected examples from the recent literature. The molecular recognition of ammonium ions in amino acids is included and the enantioselective binding of chiral ammonium ions by synthetic receptors is also covered. In our conclusion we compare the strengths and weaknesses of the different types of ammonium ion receptors which may help to select the best approach for specific applications.

  3. Materials based on uranyl ion and their potential for solar energy conversion cells

    Energy Technology Data Exchange (ETDEWEB)

    Felinto, Maria Claudia F.C.; Maceta, Luiz Felipe M.; Luiz, Jose Eduardo M. Sa; Parra, Duclerc F. [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)]. E-mail: mfelinto@ipen.br; Brito, Hermi F.; Teotonio, Ercules E.S. [Sao Paulo Univ., SP (Brazil). Inst. de Quimica]. E-mail: hefbrito@iq.usp.br

    2005-07-01

    In this work it is described synthesis, characterization and spectroscopic study of the supermolecules of UO{sub 2}{sup 2+} and octaacetatecalix[8]arene. The compounds obtained were characterized by complexation analysis for determine U{sup 6+} concentration, infrared spectra and luminescence spectra. The results agree with the following composition UO{sub 2}(MS){sub 2} is contained in octaacetatecalix[8]arene and UO{sub 2}(TCA){sub 2} is contained in octaacetatecalix[8]arene (where MS is methanesulfonate and TCA is trichloroacetate). The IR analyses show coordination of counter ion and the inclusion on the calixarene cavity. The life time behavior as a first order exponential decay for UO{sub 2}(TCA){sub 2}.(H{sub 2}O)octaacetatecalix[8]arene and UO{sub 2}(MS){sub 2}.(H{sub 2}O)octaacetatecalix[8]arene. (author)

  4. Radioactive wastes. Management prospects. Appendixes

    International Nuclear Information System (INIS)

    These appendixes complete the article BN3661 entitled 'Radioactive wastes. Management prospects'. They develop the principles of the different separation processes under study and make a status of the conditioning matrices that are envisaged: 1 - principles of advanced separation (separation of U, Np, Pu, Tc and I; separation of Am and Cm in two extraction steps (Diamex and Sanex processes); separation of Am and Cm in a single extraction step (Paladin process); separation of Am and Cm (Sesame process); separation of Cs (Calixarene process); 2 - principles of separation in pyro-chemistry: separation under inert atmosphere (non-oxidizing); separation in oxidizing conditions; 3 - conditioning matrices under study for separate elements: objectives and methodology, matrices for iodine, for cesium and for actinides. (J.S.)

  5. Evaluation of a new calix[4]arene based molecular receptor for sensitive and selective recognition of F{sup −} and Cu{sup 2+} ions

    Energy Technology Data Exchange (ETDEWEB)

    Chawla, Har Mohindra, E-mail: hmchawla@chemistry.iitd.ernet.in; Gupta, Tanu

    2014-10-15

    Design and evaluation of a single molecular receptor for multiple analytes reveal that calix[4]arene based molecular receptor 4 shows a highly selective response towards Cu{sup 2+} and F{sup −} ions with detection limits of 0.5 µM and 0.7 µM respectively when examined through UV–vis, fluorescence and {sup 1}H NMR spectroscopy. Simultaneous binding studies on 4 towards metal ion and fluoride reveal that it exhibits a negative allosteric effect towards Cu{sup 2+}/F{sup −}. - Highlights: • New calixarene based receptor for selective sensing of both F{sup −} and Cu{sup 2+}. • The LOD values for Cu{sup 2+} and F{sup −} are 0.5 μM and 0.7 μM respectively. • Simultaneous binding studies revealed negative allosterism towards Cu{sup 2+}/F{sup −} binding.

  6. Extraction of uranium from the concentrated brine rejected by integrated nuclear desalination plants

    International Nuclear Information System (INIS)

    This work was carried out under the specific collaboration agreement between the Bhabha Atomic Research Centre (BARC) from India and the Commissariat a l'Energie Atomique (CEA) from France. This paper summarises first results of review and research on the possible extraction of uranium from the concentrated brine rejected by integrated nuclear desalination systems, which both partners are currently developing in the two organisations. Three innovative and efficient methods of uranium extraction have been proposed: 1) Resin grafted with calixarene: this method has the advantage of very high selectivity. Its performances, especially for large-scale extraction, still need further R and D and optimisation; 2) Magnetic separations: yet another method with high selectivity, easy separation and affording high degree of material recovery. The method, however, is in developmental stage; 3) Canal system with Braid adsorbents: high selectivity. Appears to be feasible in conjunction with existing technology. It would nonetheless require large amounts of adsorbents and adequate infrastructure. (authors)

  7. Gamma Ray Radiolysis of the FPEX Solvent

    International Nuclear Information System (INIS)

    Slide presentation. FPEX contains a calixarene for Cs extraction, a crown ether for Sr extraction, Cs7SB modifier, and TOA to aid in stripping, in Isopar L diluent. The radiation stability FPEX must be evaluated prior to process use. Radiolytic degradation of species in solution are due to reaction with the direct radiolysis products of the diluent. In Isopar L, the reactive species produced include e-, ·H and alkane radicals, resulting in a reducing environment. However, in nitric acid, oxidizing hydroxyl (·OH) and nitro (·NO2) radicals dominate system chemistry. Thus, the nature of diluent and the presence of radical scavengers affect the results of irradiation. We report the preliminary results of a new program to investigate the radiolysis of FPEX using the 60Co irradiation of FPEX neat solvent, acid pre-equilibrated solvent and mixed aerated phases. The Cs and Sr distribution ratios were used as metrics

  8. Gamma-ray radiolysis of the FPEX solvent

    International Nuclear Information System (INIS)

    FPEX contains a calixarene for Cs extraction, a crown ether for Sr extraction, Cs7SB modifier and TOA to aid in stripping, all in Isopar L diluent. The radiation stability of FPEX must be evaluated prior to process use. The radiolytic degradation of species in solution is due to reaction with the direct radiolysis products of the diluent. In Isopar L, the reactive species produced include solvated electrons (e-), hydrogen atoms (H) and alkane radicals, resulting in a reducing environment. However, when contacted with nitric acid, oxidising hydroxyl (OH) and nitrous (NO2) radicals dominate the system chemistry. Thus, the nature of the diluent and the presence of radical scavengers affect the results of irradiation. We report the preliminary results of a new programme to investigate the radiolysis of FPEX using the 60Co irradiation of FPEX neat solvent, acid pre-equilibrated solvent and mixed aerated phases. The Cs and Sr distribution ratios were used as metrics. (authors)

  9. Study of electrochemical phosphate sensing systems: Spectrometric, potentiometric and voltammetric evaluation

    International Nuclear Information System (INIS)

    Characterization of the interaction of a urea-functionalized calix[4]arene ionophore and phosphate was undertaken by combination of nuclear magnetic resonance (NMR) spectrometry, potentiometric selectivity coefficient evaluation and voltammetric ion transfer at the interface between two immiscible electrolyte solutions (ITIES). NMR revealed that the urea protons were involved in complexation with the target anion and potentiometric separate solution selectivity data indicated selectivity for phosphate over chloride and sulphate. Voltammetry at the ITIES confirmed that the ionophore-facilitated transfer of monohydrogen phosphate occurred in preference to dihydrogen phosphate transfer. The results correlate with previously reported data on the potentiometric evaluation of this calixarene as an anionophore in PVC-membrane electrodes. The data provide the basis for development of amperometric monohydrogen phosphate sensors based on the ion-transfer principle

  10. Characterization of a sensitive and selective copper optode based on β-ketoimine modified calix[4]arene derivative

    Energy Technology Data Exchange (ETDEWEB)

    Rouis, A., E-mail: rouisahlem2@yahoo.fr [Laboratoire des Interfaces et Matériaux Avancés (LIMA), Faculté des sciences de Monastir, Avenue de l' Environnement, 5000 Monastir (Tunisia); Echabaane, M.; Sakly, N. [Laboratoire des Interfaces et Matériaux Avancés (LIMA), Faculté des sciences de Monastir, Avenue de l' Environnement, 5000 Monastir (Tunisia); Bonnamour, I. [Institut de Chimie and Biochimie Moléculaires and Supramoléculaires (ICBMS), UMR CNRS 5246, 43 Boulevard du 11 Novembre 1918, Université Claude Bernard Lyon 1, 69100 Villeurbanne (France); Ben Ouada, H. [Laboratoire des Interfaces et Matériaux Avancés (LIMA), Faculté des sciences de Monastir, Avenue de l' Environnement, 5000 Monastir (Tunisia)

    2015-01-01

    In this paper, an optical sensor was proposed for sensitive determination of copper (II) ions in aqueous solution. The sensing membrane was prepared by coating β-ketoimine calix[4]arene derivative as ionophore on a glass plate surface. Thin β-ketoimine calix[4]arene layer was characterized by contact angle measurements showing a good surface coverage. Besides, a smooth and homogeneous morphology of the calixarene membrane was examined by atomic force microscopy (AFM). The response of the optode is based on the decrease in the absorbance signal at 309 nm upon exposure to buffer solutions containing Cu{sup 2+} ions. At a pH 6.8, the proposed sensor displays a calibration response for copper over a wide concentration range of 1.0 × 10{sup −7} M to 1.0 × 10{sup −4} M with a detection limit of 2.0 × 10{sup −8} M and response time of 7–10 min. This optode exhibits good selectivity toward copper ions in comparison with common ions including Hg{sup 2+} and Ag{sup +} ions. The copper sensing film can be regenerated using 0.01 M HNO{sub 3} solution. In addition to its high stability, repeatability and reproducibility, the sensor shows operational life time of 4 weeks. - Highlights: • Optical sensor for Cu{sup 2+} ion based on β-ketoimine calix[4]arene was developed. • Sensing mechanism involved the formation of a complex between calixarene and Cu{sup 2+}. • Satisfactory analytical sensing characteristics for determining Cu{sup 2+} were obtained.

  11. Molecular engineering and fluorescence for the detection of toxic cations; Ingenierie moleculaire et fluorescence pour la reconnaissance de cations toxiques

    Energy Technology Data Exchange (ETDEWEB)

    Souchon, V

    2007-11-15

    This work is a part of the 'Toxicologie Nucleaire Environnementale' program which aims at studying the effects on the living of heavy metals or radionuclides involved in nuclear industry. Most particularly, it deals with the design of new fluorescent sensors for the selective detection of Pb{sup 2+}, Cd{sup 2+} and Cs{sup +} in biological media. Several fluorescent calixarenes possessing nitrogen atoms were synthesized and their properties as potential lead sensors were investigated. One of them could be used in experimental conditions close to biological media and new target compounds with amide functional groups were proposed. Many approaches were considered for the design of selective fluorescent sensors for cadmium. On the basis of literature results, many chelating compounds incorporating sulfur atoms were synthesized but showed no significant affinity towards cadmium. On the opposite, compounds functionalized with several pyridine-2'-yl-1,2,3-triazol fluorescent moieties linked to a {beta}-cyclodextrin or a calix[4]arene showed good affinity for cadmium in methanol, but the selectivity was found to be insufficient. In contrast, very satisfying results in terms of both selectivity and sensitivity could be obtained with the commercial calcium sensor Rhod-5N in an aqueous medium at neutral pH. Lastly, micromolar detection limits for the selective detection of caesium were reached in an aqueous medium at neutral pH thanks to a new sulfonated fluorescent calixarene with two appended crown-ethers. An original complexation mechanism was proposed and validated by molecular modelling (DFT). (author)

  12. Synthesis and complexation properties towards uranyl cation of carboxylic acid derivatives of p-tert-butyl-calix[6]arene

    International Nuclear Information System (INIS)

    In the fuel reprocessing plants radioactive metals, and more particularly, uranium in UO22+ form in the various installations, have many varied physico-chemical forms and there is a risk of exposure and internal contamination in the nuclear industry. It is necessary to exert a medical control to ensure the protection of the health of the workers. This medical control is done by dosing uranyl cation in the urine of the exposed people. This work forms part of this context. Indeed, we prepared a ligand able to complex the ion uranyl and which is also to be grafted on a solid support. In the family of calixarenes, the calix[6]arenes functionalized by three or four carboxylic functions were selected like chelating molecules of the ion uranyl. The properties of complexation of these calixarenes were studied by potentiometry in methanol, under these conditions balances of protonation and complexation were determined and the constant partners were obtained using the Hyperquad program. We synthesized tri-carboxylic calix[6]arenes comprising of the groupings nitro (NO2) in para position of phenol in order to see the influence of a substitution in para position on the complexation. We also synthesized calix[6]arenes tetra-carboxylic in order to show the role of an additional carboxylic acid grouping. The potentiometric study determined thermodynamic parameters of protonation and complexation of carboxylic calix[6]arenes. The results of the complexation highlighted which complex UO2L corresponding to the ligand para-tert-butyl-calix[6]arene tetra-acid is more stable than that corresponding to the ligand mono-nitro calix[6]arene tri-acid (ΔlogΒ110 = 4.3), and than the effect of the groupings nitro in para position has low influence on the complexation of UO22+. This makes it possible to consider as possible the grafting of the calix[6]arenes which one knows the behaviour of trapping. To this end we synthesized the ligand 23. (author)

  13. Binding properties of oxacalix[4]arenes derivatives toward metal cations; Interactions entre cations metalliques et derives des oxacalix[4]arenes

    Energy Technology Data Exchange (ETDEWEB)

    Mellah, B

    2006-11-15

    The objective of this work was to establish the binding properties of oxacalix[4]arene derivatives with different numbers of the oxa bridges, functional groups (ketones, pyridine, ester, amide and methoxy) and conformations. Their interactions with alkali and alkaline-earth, heavy and transition metal cations have been evaluated according to different approaches: (i) extraction of corresponding picrates from an aqueous phase into dichloromethane; (ii) determination of the thermodynamic parameters of complexation in methanol and/or acetonitrile by UV-spectrophotometry and micro-calorimetry; (iii) determination of the stoichiometry of the complexes by ESI-MS; (iv) {sup 1}H-NMR titrations allowing to localize the metal ions in the ligand cavity. In a first part dealing on homo-oxacalix[4]arenes, selectivities for Na{sup +}, K{sup +}, Ca{sup 2+}, Pb{sup 2+} and Mn{sup 2+} of ketones derivatives was shown. The presence of oxa bridge in these derivatives increases their efficiency while decreasing their selectivity with respect to related calixarenes. The pyridine derivative prefers transition and heavy metal cations, in agreement with the presence of the soft nitrogen atoms. In the second part, di-oxacalix[4]arene ester and secondary amide derivatives were shown to be less effective than tertiary amide counterparts but to present high selectivities for Li{sup +}, Ba{sup 2+}, Zn{sup 2+} and Hg{sup 2+}. A third part devoted to the octa-homo-tetra-oxacalix[4]arene tetra-methoxy shows that the 1:1 metal complexes formed are generally more stable than those of calixarenes, suggesting the participation of the oxygen atoms of the bridge in the complexation. Selectivity for Cs{sup +}, Ba{sup 2+}, Cu{sup 2+} and Hg{sup 2+} were noted. (author)

  14. Binding properties of oxacalix[4]arenes derivatives toward metal cations

    International Nuclear Information System (INIS)

    The objective of this work was to establish the binding properties of oxacalix[4]arene derivatives with different numbers of the oxa bridges, functional groups (ketones, pyridine, ester, amide and methoxy) and conformations. Their interactions with alkali and alkaline-earth, heavy and transition metal cations have been evaluated according to different approaches: (i) extraction of corresponding picrates from an aqueous phase into dichloromethane; (ii) determination of the thermodynamic parameters of complexation in methanol and/or acetonitrile by UV-spectrophotometry and micro-calorimetry; (iii) determination of the stoichiometry of the complexes by ESI-MS; (iv) 1H-NMR titrations allowing to localize the metal ions in the ligand cavity. In a first part dealing on homo-oxacalix[4]arenes, selectivities for Na+, K+, Ca2+, Pb2+ and Mn2+ of ketones derivatives was shown. The presence of oxa bridge in these derivatives increases their efficiency while decreasing their selectivity with respect to related calixarenes. The pyridine derivative prefers transition and heavy metal cations, in agreement with the presence of the soft nitrogen atoms. In the second part, di-oxacalix[4]arene ester and secondary amide derivatives were shown to be less effective than tertiary amide counterparts but to present high selectivities for Li+, Ba2+, Zn2+ and Hg2+. A third part devoted to the octa-homo-tetra-oxacalix[4]arene tetra-methoxy shows that the 1:1 metal complexes formed are generally more stable than those of calixarenes, suggesting the participation of the oxygen atoms of the bridge in the complexation. Selectivity for Cs+, Ba2+, Cu2+ and Hg2+ were noted. (author)

  15. Characterization of a sensitive and selective copper optode based on β-ketoimine modified calix[4]arene derivative

    International Nuclear Information System (INIS)

    In this paper, an optical sensor was proposed for sensitive determination of copper (II) ions in aqueous solution. The sensing membrane was prepared by coating β-ketoimine calix[4]arene derivative as ionophore on a glass plate surface. Thin β-ketoimine calix[4]arene layer was characterized by contact angle measurements showing a good surface coverage. Besides, a smooth and homogeneous morphology of the calixarene membrane was examined by atomic force microscopy (AFM). The response of the optode is based on the decrease in the absorbance signal at 309 nm upon exposure to buffer solutions containing Cu2+ ions. At a pH 6.8, the proposed sensor displays a calibration response for copper over a wide concentration range of 1.0 × 10−7 M to 1.0 × 10−4 M with a detection limit of 2.0 × 10−8 M and response time of 7–10 min. This optode exhibits good selectivity toward copper ions in comparison with common ions including Hg2+ and Ag+ ions. The copper sensing film can be regenerated using 0.01 M HNO3 solution. In addition to its high stability, repeatability and reproducibility, the sensor shows operational life time of 4 weeks. - Highlights: • Optical sensor for Cu2+ ion based on β-ketoimine calix[4]arene was developed. • Sensing mechanism involved the formation of a complex between calixarene and Cu2+. • Satisfactory analytical sensing characteristics for determining Cu2+ were obtained

  16. Contributions to MALDI TOF- and ESI ion trap mass spectrometry of biopolymers, synthetic polymers and highly polar analytes

    International Nuclear Information System (INIS)

    The present thesis focuses on the so-called 'soft' desorption/ionization techniques matrix assisted laser desorption/ionization (MALDI) and atmospheric pressure ionization (API) mass spectrometry. This thesis contains five publications that describe methods and techniques which have been developed and evaluated for the characterization of (glyco)proteins, carbohydrates, technical polymers, calixarenes and fluorescence labeled peptides. The first paper presents and evaluates several simple methods for cleaning and desalting proteins and glycoproteins prior to MALDI TOF MS, which are especially well suited for small sample amounts. Advantages and disadvantages of these methods, with respect to sample volume, sample amount, time consumption, concentration and losses are discussed. The second paper shows the utility of MALDI MS for the analysis of modified cyclodextrines. These cyclic carbohydrates are used as chiral selectors in enantiomeric separations. It is shown that material purchased from different manufacturers is not identical and exhibits considerable heterogeneity. The third paper describes a new matrix, 4-hydroxy benzylidene malonnitrile, for MALDI MS analysis of industrially relevant synthetic polymers such as polyethyleneglycole, polystyrole, polymethyl methacrylate and especially for polyacryle nitride, which has so far never been investigated by MALDI MS. The advantage of delayed ion extraction in MALDI MS is also demonstrated. In the fourth contribution calixarenes, small cup-shaped molecules, are investigated. These polyphenolic compounds behave similar to carbohydrates in MALDI MS analysis. In the positive ion mode caution adducts can be detected, whereas in the negative ion mode deprotonated molecules dominate the mass spectra. By fragment ion analysis the identity of substituents can be verified. In the last paper the fragment ions of fluorescence labeled peptides, derived from either MALDI PSD MS or ESI IT MS, are compared. Fluorescence labeling

  17. Supported liquid membranes (SLM) utilized to separation of elements 4f and uranium

    International Nuclear Information System (INIS)

    Liquid membranes have been an emerging technique used as an alternative for the separation and preconcentration of several metallic species. It have been applied as one alternative technique in the separation of metallic ions originating from several areas of industry like the hydrometallurgical, gases separation, biotechnology, treatment of nuclear and non-nuclear waste. The recovery of those metals through that technique has good potential to reduce, in very low levels, pollutants in processes. The liquid membrane is a solution, which is an organic solvent, water immiscible and with low dielectric constant, that is used as a diluent for an extractor agent, also called the sequestering agent, loader or metal transporter, which is absorbed in the microporous of a polymeric film and actuates as solid support of the liquid membrane. The extractor agent gets the metallic ion from the feed solution liberating it on the other side of the membrane, through stripping solution. Then, the extraction and stripping of the metallic species are carried out in a single step in the process, and has this advantage in relation to the liquid-liquid extraction that requests a large number of stages to obtain products with high purity. Besides, the technique of SLM needs low capital and operational cost, low energy consumption and use of little amount of extractor agent, making possible the use of expensive extractor agents. The main objective of this research is to investigate the influence of several parameters in the process of extraction of lanthanide metals and uranium originating from a simulated radioactive waste using as polymeric support membranes, PTFE and as loader calixarenes. The calixarenes are part of a very versatile class of macrocyclic compounds that can be functionalized, being obtained like this a great variety of multifunctional receptors. (author)

  18. New polymeric membrane cadmium(II)-selective electrodes using tripodal amine based ionophores

    Energy Technology Data Exchange (ETDEWEB)

    Khamjumphol, Utisawadee [Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002 (Thailand); Watchasit, Sarayut [Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330 (Thailand); Suksai, Chomchai [Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Burapha University, Chonburi 20131 (Thailand); Janrungroatsakul, Wanwisa [Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330 (Thailand); Boonchiangma, Suthasinee [Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002 (Thailand); Tuntulani, Thawatchai [Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330 (Thailand); Ngeontae, Wittaya, E-mail: wittayange@kku.ac.th [Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002 (Thailand); Research Center for Environmental and Hazardous Substance Management, Khon Kaen University, Khon Kaen 40002 (Thailand); National Center of Excellence for Environmental and Hazardous Waste Management, Khon Kaen University, Khon Kaen 40002 (Thailand)

    2011-10-17

    Highlights: {yields} New four ionophores having tripodal amine (TPA) unit on anthracene and calixarene. {yields} Synthesis and characterization data were reported. {yields} Incorporated to the plasticized PVC membranes to prepare Cd-ISEs. {yields} Two TPA units on calixarene showed the best selectivity toward Cd{sup 2+}. {yields} Applied for sensing Cd{sup 2+} from the oxidation of CdS QDs solution. - Abstract: Fabrication of PVC membrane electrodes incorporating selective neutral carriers for Cd{sup 2+} was reported. The ionophores were designed to have different topologies, donor atoms and lipophilicity by attaching tripodal amine (TPA) units to the lipophilic anthracene (ionophore I) and p-tert-butylcalix[4]arene (ionophores II, III and IV). The synthesized ionophores were incorporated to the plasticized PVC membranes to prepare Cd(II) ion selective electrodes (ISEs). The membrane electrodes were optimized by changing types and amounts of ionic sites and plasticizers. The selectivity of the membranes fabricated from the synthesized ionophores was evaluated, the relationship between structures of ionophores and membrane characteristics were explored. The ionophore IV which composed of two opposites TPA units on the calix[4]arene compartment showed the best selectivity toward Cd{sup 2+}. The best membrane electrode was fabricated from ionophore IV (10.2 mmol kg{sup -1}) with KTpClPB (50.1 mol% related to the ionophore) as an ion exchanger incorporated in the DOS plasticized PVC membrane (1:2; PVC:DOS). The Cd-ISE fabricated from ionophore IV exhibited good properties with a Nernstian response of 29.4 {+-} 0.6 mV decade{sup -1} of activity for Cd{sup 2+} ions and a working concentration range of 1.6 x 10{sup -6}-1.0 x 10{sup -2} M. The sensor has a fast response time of 10 s and can be used for at least 1 week without any divergence in potential. The electrode can be used in the pH range of 6.0-9.0. The proposed electrodes using ionophores III and IV were employed

  19. Synthesis and complexation properties towards uranyl cation of carboxylic acid derivatives of p-tert-butyl-calix[6]arene; Synthese et proprietes complexantes vis-a-vis de l'ion uranyle de derives carboxyliques du p-tert-butyl-calix[6]arene

    Energy Technology Data Exchange (ETDEWEB)

    Souane, R

    2005-03-15

    In the fuel reprocessing plants radioactive metals, and more particularly, uranium in UO{sub 2}{sup 2+} form in the various installations, have many varied physico-chemical forms and there is a risk of exposure and internal contamination in the nuclear industry. It is necessary to exert a medical control to ensure the protection of the health of the workers. This medical control is done by dosing uranyl cation in the urine of the exposed people. This work forms part of this context. Indeed, we prepared a ligand able to complex the ion uranyl and which is also to be grafted on a solid support. In the family of calixarenes, the calix[6]arenes functionalized by three or four carboxylic functions were selected like chelating molecules of the ion uranyl. The properties of complexation of these calixarenes were studied by potentiometry in methanol, under these conditions balances of protonation and complexation were determined and the constant partners were obtained using the Hyperquad program. We synthesized tri-carboxylic calix[6]arenes comprising of the groupings nitro (NO{sub 2}) in para position of phenol in order to see the influence of a substitution in para position on the complexation. We also synthesized calix[6]arenes tetra-carboxylic in order to show the role of an additional carboxylic acid grouping. The potentiometric study determined thermodynamic parameters of protonation and complexation of carboxylic calix[6]arenes. The results of the complexation highlighted which complex UO{sub 2}L corresponding to the ligand para-tert-butyl-calix[6]arene tetra-acid is more stable than that corresponding to the ligand mono-nitro calix[6]arene tri-acid ({delta}log{beta}110 = 4.3), and than the effect of the groupings nitro in para position has low influence on the complexation of UO{sub 2}{sup 2+}. This makes it possible to consider as possible the grafting of the calix[6]arenes which one knows the behaviour of trapping. To this end we synthesized the ligand 23

  20. Quantum dot-dye hybrid systems for energy transfer applications

    International Nuclear Information System (INIS)

    -dye complexes can also be easily transferred into water. Our approach can apply to not only dye molecules but also other organic molecules. As an example, the QDs have been complexed with calixarene molecules and the QD-calixarene complexes also have potential for QD-based energy transfer study. (orig.)

  1. Quantum dot-dye hybrid systems for energy transfer applications

    Energy Technology Data Exchange (ETDEWEB)

    Ren, Ting

    2010-07-01

    -dye complexes can also be easily transferred into water. Our approach can apply to not only dye molecules but also other organic molecules. As an example, the QDs have been complexed with calixarene molecules and the QD-calixarene complexes also have potential for QD-based energy transfer study. (orig.)

  2. Triflate-functionalized calix[6]arenes as versatile building-blocks: application to the synthesis of an inherently chiral Zn(ii) complex.

    Science.gov (United States)

    Zahim, Sara; Lavendomme, Roy; Reinaud, Olivia; Luhmer, Michel; Evano, Gwilherm; Jabin, Ivan

    2016-02-14

    Cavity-based metal complexes can find many applications notably in the fields of catalysis and biomimicry. In this context, it was shown that metal complexes of calix[6]arenes bearing three aza-coordinating arms at the small rim provide excellent structural models of the poly-imidazole sites found in the active site of many metallo-enzymes. All these N-donor ligands were synthesized from the 1,3,5-tris-methoxy-p-tBu-calix[6]arene platform, which presents some limitations in terms of functionalization. Therefore, there is a need for the development of new calix[6]arene-based building-blocks selectively protected at the small rim. Herein we describe the regioselective one step synthesis of two calix[6]arenes decorated with triflate groups, i.e. X6H4Tf2 and X6H3Tf3, from the parent calix[6]arene X6H6. It is shown that the triflate groups can either act as protecting or deactivating groups, allowing the elaboration of sophisticated calixarene-based systems selectively functionalized at the large and/or at the small rim. In addition, X6H3Tf3 is functionalized on the A, B, and D rings and thus gives access to inherently chiral compounds, as demonstrated by the synthesis of a rare example of inherently chiral cavity-based metal complex. PMID:26751614

  3. NOVEL FISSION PRODUCT SEPARATION BASED ON ROOM-TEMPERATURE IONIC LIQUIDS

    Energy Technology Data Exchange (ETDEWEB)

    Hussey, Charles L.

    2004-06-01

    The DoE/NE underground storage tanks at Hanford, SRS, and INEEL contain liquid wastes with high concentrations of radioactive species, mainly 137Cs and 90Sr. Because the other components of the liquid waste are mainly sodium nitrate and sodium hydroxide, most of this tank waste can be treated inexpensively as low-level waste if 137Cs and 90Sr can be selectively removed. Many ionophores (crown ether and calixarene compounds) have been synthesized for the purpose of selectively extracting Cs+ and Sr2+ from an aqueous phase into an immiscible organic phase. Recent studies conducted at ORNL1,2 reveal that hydrophobic ionic liquids might be better solvents for extracting metal ions from aqueous solutions with these ionophores than conventional immiscible organic solvents, such as benzene, toluene, and dichloromethane, because both Cs+ and Sr2+ exhibit larger distribution coefficients in the ionic liquids. In addition, the vapor pressures of these ionic liquids are insignificant. Thus, there is little or no vaporization loss of these solvents. Most of the ionic liquids under investigation are relatively nontoxic compared to the hydrocarbon solvents that they replace, classifying them as ''green'' solvents.

  4. Report on the scientifical feasibility of advanced separation

    International Nuclear Information System (INIS)

    The advanced separation process Purex has been retained for the recovery of neptunium, technetium and iodine from high level and long lived radioactive wastes. Complementary solvent extraction processes will be used for the recovery of americium, curium and cesium from the high activity effluents of the spent fuel reprocessing treatment. This document presents the researches carried out to demonstrate the scientifical feasibility of the advanced separation processes: the adaptation of the Purex process would allow the recovery of 99% of the neptunium, while the association of the Diamex and Sanex (low acidity variant) processes, or the Paladin concept (single cycle with selective de-extraction of actinides) make it possible the recovery of 99.8% of the actinides III (americium and curium) with a high lanthanides decontamination factor (greater than 150). The feasibility of the americium/curium separation is demonstrated with the Sesame process (extraction of americium IV after electrolytic oxidation). Iodine is today recovered at about 99% with the Purex process and the dissolved fraction of technetium is also recovered at 99% using an adaptation of the Purex process. The non-dissolved fraction is retained by intermetallic compounds in dissolution residues. Cesium is separable from other fission products with recovery levels greater than 99.9% thanks to the use of functionalized calixarenes. The scientifical feasibility of advanced separation is thus demonstrated. (J.S.)

  5. Kinetic and Thermodynamic Stabilization of Metal Complexes by Introverted Coordination in a Calix[6]azacryptand.

    Science.gov (United States)

    Inthasot, Alex; Brunetti, Emilio; Lejeune, Manuel; Menard, Nicolas; Prangé, Thierry; Fusaro, Luca; Bruylants, Gilles; Reinaud, Olivia; Luhmer, Michel; Jabin, Ivan; Colasson, Benoit

    2016-03-24

    The Huisgen thermal reaction between an organic azide and an acetylene was employed for the selective monofunctionalization of a X6 -azacryptand ligand bearing a tren coordinating unit [X6 stands for calix[6]arene and tren for tris(2-aminoethyl)amine]. Supramolecular assistance, originating from the formation of a host-guest inclusion complex between the reactants, greatly accelerates the reaction while self-inhibition affords a remarkable selectivity. The new ligand possesses a single amino-leg appended at the large rim of the calixarene core and the corresponding Zn(2+) complex was characterized both in solution and in the solid state. The coordination of Zn(2+) not only involves the tren cap but also the introverted amino-leg, which locks the metal ion in the cavity. Compared with the parent ligand deprived of the amino-leg, the affinity of the new monofunctionalized X6 tren ligand 6 for Zn(2+) is found to have a 10-fold increase in DMSO, which is a very competitive solvent, and with an enhancement of at least three orders of magnitude in CDCl3 /CD3 OD (1:1, v/v). In strong contrast with the fast binding kinetics, decoordination of Zn(2+) as well as transmetallation appeared to be very slow processes. The monofunctionalized X6 tren ligand 6 fully protects the metal ion from the external medium thanks to the combination of a cavity and a closed coordination sphere, leading to greater thermodynamic and kinetic stabilities. PMID:26916610

  6. A mixed DFT-MD methodology for the in silico development of drug releasing macrocycles. Calix and thia-calix[N]arenes as carriers for Bosutinib and Sorafenib.

    Science.gov (United States)

    Galindo-Murillo, Rodrigo; Aguilar-Suárez, Luis Enrique; Barroso-Flores, Joaquín

    2016-04-15

    Interaction energies between a family of 36 calix[n]arenes, their corresponding thia- analogues, and two commercially available second generation tyrosine kinase III inhibitors-Bosutinib and Sorafenib-were calculated through DFT methods at the B97D/6-31G(d,p) level of theory, based on Natural Population Analysis, for the in silico development of suitable drug carriers based on the aforementioned macrocycles which can increase their bioavailability and in turn their pharmaceutical efficiency. Molecular Dynamics simulations (production runs: +500 ns) using the General Amber Force Field were also carried out in order to assess the releasing process of these drugs in an explicit aqueous environment. In total, 144 host-guest complexes are examined. According to our results, five-membered SO3 H and i-Pr functionalized-calixarenes are the best candidates for Sorafenib-carriers while six-membered ones SO3 H and C2 H4 NH2 functionalized- are the lead candidates for Bosutinib-carriers. © 2015 Wiley Periodicals, Inc. PMID:26714797

  7. Limitations and Extensions of the Lock-and-Key Principle: Differences between Gas State, Solution and Solid State Structures

    Directory of Open Access Journals (Sweden)

    Hans-Jörg Schneider

    2015-03-01

    Full Text Available The lock-and-key concept is discussed with respect to necessary extensions. Formation of supramolecular complexes depends not only, and often not even primarily on an optimal geometric fit between host and guest. Induced fit and allosteric interactions have long been known as important modifications. Different binding mechanisms, the medium used and pH effects can exert a major influence on the affinity. Stereoelectronic effects due to lone pair orientation can lead to variation of binding constants by orders of magnitude. Hydrophobic interactions due to high-energy water inside cavities modify the mechanical lock-and-key picture. That optimal affinities are observed if the cavity is only partially filled by the ligand can be in conflict with the lock-and-key principle. In crystals other forces than those between host and guest often dominate, leading to differences between solid state and solution structures. This is exemplified in particular with calixarene complexes, which by X-ray analysis more often than other hosts show guest molecules outside their cavity. In view of this the particular problems with the identification of weak interactions in crystals is discussed.

  8. Host-guest interaction between water-soluble calix[6]arene hexasulfonate and p-nitrophenol

    International Nuclear Information System (INIS)

    The inclusion complexation of calix[6]arene hexasulfonate with p-nitrophenol has been studied by photoluminescence (PL), differential scanning calorimetry (DSC) and quantum-chemical methods in aqueous media. The results indicate 1:1 complex stoichiometry. The directly measured molar enthalpy of inclusion shows strong interaction between the host and the guest, however the entropy change of the complex formation is negative and quite high. Therefore, the Gibbs free enthalpy change of the complex formation is small resulting in a relatively low complex stability. This well-known enthalpy-entropy-compensation effect is probably due to the increased freedom of guest molecules relative to the host calixarenes and also due to the increased disorder of solvent molecules after the complex has been dissociated. The good correlation between the van't Hoff enthalpy determined by PL studies and the calorimetric enthalpy reflects the two-state character of complexation. Quantum-chemical investigation suggests π-π interaction between the host and the guest in agreement with earlier results

  9. Schiff's Bases and Crown Ethers as Supramolecular Sensing Materials in the Construction of Potentiometric Membrane Sensors

    Directory of Open Access Journals (Sweden)

    Siavash Riahi

    2008-03-01

    Full Text Available Ionophore incorporated PVC membrane sensors are well-established analyticaltools routinely used for the selective and direct measurement of a wide variety of differentions in complex biological and environmental samples. Potentiometric sensors have someoutstanding advantages including simple design and operation, wide linear dynamic range,relatively fast response and rational selectivity. The vital component of such plasticizedPVC members is the ionophore involved, defining the selectivity of the electrodes' complexformation. Molecular recognition causes the formation of many different supramolecules.Different types of supramolecules, like calixarenes, cyclodextrins and podands, have beenused as a sensing material in the construction of ion selective sensors. Schiff's bases andcrown ethers, which feature prominently in supramolecular chemistry, can be used assensing materials in the construction of potentiometric ion selective electrodes. Up to now,more than 200 potentiometric membrane sensors for cations and anions based on Schiff'sbases and crown ethers have been reported. In this review cation binding and anioncomplexes will be described. Liquid membrane sensors based on Schiff's bases and crownethers will then be discussed.

  10. Selective polymer materials: absolute determination of their sorption properties

    Science.gov (United States)

    Jakusch, Michael; Mizaikoff, Boris

    2001-02-01

    Several types of selective materials are frequently used in chemical sensors such as natural antibodies, synthetic host substances (calixarenes, cyclodextrines, etc.) molecularly imprinted materials, or conventional polymers. For a systematic development of those materials, their sorption behavior for interesting analyte substances and potentially interfering compounds has to be thoroughly characterized, which can be a time-consuming and error-prone task. Moreover, using the respective sensor principle itself for this characterization an exact relation between the sensor signal and the underlying partition coefficient or sorption isotherm can often not be obtained. In this paper, we present an automated method for the direct determination of polymer/water partition coefficients of volatile organic compounds that consists of an automated fluid handling system, a dedicated partitioning cell and a purge-and-trap gas chromatography (PT-GC) unit. The main application of this novel system is the characterization of layer materials for infrared evanescent wave spectroscopic (IR-EWS) sensors, however an extension to other problems is conceivable. The whole experimental procedure comprising calibration of the GC system, preparation of test solutions, analyte partitioning, sample analysis, as well as the necessary cleaning steps is performed automatically under computer control. Hence, this system can be operated unattendedly, yielding a reasonable throughput with comparatively low expenditure of human labor.

  11. Aqua(μ-cone-26,28-dibutoxy-25,27-bis{N-[5-(dimethylaminonaphthalene-1-sulfonyl]carbamoylmethoxy}-5,11,17,23-tetrakis(1,1-dimethylethylcalix[4]arene(2−disodium acetonitrile tetrasolvate

    Directory of Open Access Journals (Sweden)

    Pogisego Dinake

    2012-04-01

    Full Text Available The structure of the title complex, [Na2(C80H98N4O10S2(H2O]·4CH3CN, obtained after crystallization from acetonitrile, contains two formula units in the asymmetric unit (Z′ = 2 and an estimated four molecules of acetonitrile per calixarene moiety. It is unusual for two Na+ ions to occupy the lower rims of the cone calix[4]arene, as in this case, with one Na+ ion forming two O→ Na+ coordinate bonds with the two butoxy groups and four such bonds with the two N-dansyl carboxamide groups, forming six dative bonds between Na+ and O. On the other hand, the other Na+ ion forms only five O→Na+ coordinate bonds on the far end of the calix[4]arene lower rim, bringing the two dansyl groups in close proximity with each other. There also appears to be an O→Na+ coordination coming from a dangling water molecule. The structure contained both resolved and poorly resolved solvent molecules. The latter were treated using the SQUEEZE routine in PLATON [Spek (2009. Acta Cryst. D65, 148–155].

  12. Colorimetric detection of Cu2+ and Pb2+ ions using calix[4]arene functionalized gold nanoparticles

    Indian Academy of Sciences (India)

    Ravi Gunupuru; Debdeep Maity; Gopala R Bhadu; Ashish Chakraborty; Divesh N Srivastava; Parimal Paul

    2014-05-01

    Calixarene functionalized gold nanoparticles (CFAuNPs) have been prepared and characterized by spectroscopic and microscopic (TEM) techniques. To use this material as potential colorimetric sensor, the binding property of this new material has been investigated with a large number of metal ions. It exhibited sharp colour change from dark brown to green and blue, detectable by naked-eye, in the presence of Cu2+ and Pb2+ ions, respectively. It has also triggered substantial change in surface plasmon resonance (SPR) band of the functionalized gold nanoparticles, which in case of Pb(II) is due to the inter particle plasmon coupling arising from the metal-induced aggregation of the nanoparticles and for Cu(II), it is because of the formation of AuCu alloy due to anti-galvanic exchange. The size and aggregation of the nanoparticles are confirmed from HRTEM images, elemental analysis and the line profiling for both the metal ions have been done by STEM-EDX analysis.

  13. CMPO-calix[4]arenes and the influence of structural modifications on the Eu(III), Am(III), Cm(III) separation

    International Nuclear Information System (INIS)

    The syntheses of new calix[4]arenes featuring CMPO groups on the wide rim are reported and the extraction of Am(III) and Eu(III) from concentrated HNO3 aqueous phases are discussed with reference to the properties of the symmetric tetra-CMPO derivative 1. All extraction studies were conducted in the same experimental conditions which allows to directly compare the dependence of the distribution coefficients of various calixarenes on the acid concentration (0.1 M 3] < 5 M). Calix[4]arene 1 becomes a very poor extractant if the length of the aliphatic chain between the amide and phosphine oxide groups of CMPO is increased, if the bridging methylene groups are replaced by sulfur atoms or if the macrocyclic cavity size is increased. By contrast, mixed amide - CMPO calix[4]arenes are nearly as effective than 1. Moreover, Am(III)/Cm(III) separation coefficients between 1.5 and 3 have been obtained with unsymmetrical calix[4]arenes of type 1 with different aliphatic chains grafted on the narrow rim. Guidelines to anticipate the extraction ability of calix[4]arenes remain elusive because of the intricate solution behavior of these compounds. (orig.)

  14. CMPO-calix[4]arenes with spacer containing intramolecular hydrogen bonding: effect of local rigidification on solvent extraction toward f-block elements.

    Science.gov (United States)

    Chu, Hongzhu; He, Lutao; Jiang, Qian; Fang, Yuyu; Jia, Yiming; Yuan, Xiangyang; Zou, Shuliang; Li, Xianghui; Feng, Wen; Yang, Yuanyou; Liu, Ning; Luo, Shunzhong; Yang, Yanqiu; Yang, Liang; Yuan, Lihua

    2014-01-15

    To understand intramolecular hydrogen bonding in effecting liquid-liquid extraction behavior of CMPO-calixarenes, three CMPO-modified calix[4]arenes (CMPO-CA) 5a-5c with hydrogen-bonded spacer were designed and synthesized. The impact of spacer rotation that is hindered by introduction of intramolecular hydrogen bonding upon extraction of La(3+), Eu(3+), Yb(3+), Th(4+), and UO2(2+) has been examined. The results show that 5b and 5c containing only one hydrogen bond with a less hindered rotation spacer extract La(3+) more efficiently than 5a containing two hydrogen bonds with a more hindered rotation spacer, demonstrating the importance of local rigidification of spacer in the design of extractants in influencing the coordination environment. The large difference in extractability between La(3+) and Yb(3+) (or Eu(3+)) by 5b (or 5c), and the small difference by 5a, suggests intramolecular hydrogen bonding do exert pronounced influence upon selective extraction of light and heavy lanthanides. Log-log plot analysis indicates a 1:1, 2:1 and 1:1 stoichiometry (ligand/metal) for the extracted complex formed between 5b and La(3+), Th(4+), UO2(2+), respectively. Additionally, their corresponding acyclic analogs 7a-7c exhibit negligible extraction toward these metal ions. These results reveal the possibility of selective extraction via tuning local chelating surroundings of CMPO-CA by aid of intramolecular hydrogen bonding. PMID:24295773

  15. Advanced electric-field scanning probe lithography on molecular resist using active cantilever

    Science.gov (United States)

    Kaestner, Marcus; Aydogan, Cemal; Ivanov, Tzvetan; Ahmad, Ahmad; Angelov, Tihomir; Reum, Alexander; Ishchuk, Valentyn; Krivoshapkina, Yana; Hofer, Manuel; Lenk, Steve; Atanasov, Ivaylo; Holz, Mathias; Rangelow, Ivo W.

    2015-07-01

    The routine "on demand" fabrication of features smaller than 10 nm opens up new possibilities for the realization of many devices. Driven by the thermally actuated piezoresistive cantilever technology, we have developed a prototype of a scanning probe lithography (SPL) platform which is able to image, inspect, align, and pattern features down to the single digit nanoregime. Here, we present examples of practical applications of the previously published electric-field based current-controlled scanning probe lithography. In particular, individual patterning tests are carried out on calixarene by using our developed table-top SPL system. We have demonstrated the application of a step-and-repeat SPL method including optical as well as atomic force microscopy-based navigation and alignment. The closed-loop lithography scheme was applied to sequentially write positive and negative tone features. Due to the integrated unique combination of read-write cycling, each single feature is aligned separately with the highest precision and inspected after patterning. This routine was applied to create a pattern step by step. Finally, we have demonstrated the patterning over larger areas, over existing topography, and the practical applicability of the SPL processes for lithography down to 13-nm pitch patterns. To enhance the throughput capability variable beam diameter electric field, current-controlled SPL is briefly discussed.

  16. Dual-Responsive Mechanized Mesoporous Silica Nanoparticles Based on Sulfonatocalixarene Supramolecular Switches.

    Science.gov (United States)

    Zhou, Ting; Song, Nan; Xu, Shi-Han; Dong, Biao; Yang, Ying-Wei

    2016-06-17

    Mesoporous silica nanoparticles (MSNs) have been functionalized with supramolecular switches, composed of cleavable disulfide bond-containing alkylammonium stalks encircled by water-soluble sulfonatocalix[4,6]arenes, to result in smart mechanized MSNs. Cargo can be encased tightly in the nanopores of these mechanized MSNs in their closed state, but are released efficiently either in response to L-glutathione (GSH), by cleaving the disulfide bonds in the stalks, or in response to pH variation, by turning on the calixarene-based supramolecular switches. The higher concentration of GSH in cancer cell cytosol and the relatively lower pH value of cancer cell lysosome can simultaneously activate the mechanized MSNs, enabling them to release the pre-loaded cargo in place. This sufficient use of the different environment of cancer cells and normal healthy cells can enhance the targeting effect of delivery vehicles and effectively lower the side effects of delivered anti-cancer drugs. In vitro cytotoxicity tests suggest good biocompatibility and low toxicity of these newly developed drug-delivery systems. PMID:26507946

  17. Chromoionophoric Recognition of Alkylamines by Nitro Derivative

    International Nuclear Information System (INIS)

    The molecular design of efficient and selective chromogenic and fluorogenic ionophore systems for the sensing of chemically and biologically important ionic guests has attracted much attention in the past decade. Many of the compounds are based on the well-known molecular framework of crown ethers, calixarenes, and other EDTA type efficient chelating compounds. Among them the calix[4]arenes are particularly attractive for their selective ionophoric properties toward many of interesting organic ammonium guests. Particularly, the calix[4]arene-crown ethers are known to have unique binding properties toward some of alkali, alkaline earth metal ions, and biogenic amines. Many of the chromogenic sensing materials are developed by conjugating molecular framework of calix[4]- arene-crown ethers with suitable signaling functions of azophenols, thiazoles, and indophenols. Quite unexpectedly, however, the ionophoric properties of simple nitro derivative of calix[4]arene-crown ethers were not reported, except for the closely related structure having ester-ether functions in crown moiety, in spite of their synthetically easy availability and expectedly efficient ionophoric properties toward organic amine guests. In this paper, we report the ionophoric properties of dinitro derivative of calix[4]arene-crown-5 ether 1 toward representative alkylammonium ions aiming for the development of efficient and selective chromogenic sensing material for the biologically important organic amine guests. The Ba2+-selective chromogenic behavior of 1 over the representative alkali and alkaline earth metal ions has been reported earlier.

  18. Electron beam lithography of Fresnel zone plates using a rectilinear machine and trilayer resists

    International Nuclear Information System (INIS)

    We describe the use of a commercial e-beam lithography system (JEOL JBX-6000FS) to fabricate Fresnel zone plates for x-ray microscopy. The machine is capable of controlling the pitch of optical gratings with sub-nanometer precision, so its beam placement properties are more than adequate for zone plate fabrication. The zone plate pattern is written into a thin top layer (PMMA or Calixarene) of a trilayer resist, and transferred into thick nickel zones using reactive ion etching (RIE) followed by electroplating. Zone plates with outermost zone widths of 30 nm have exhibited efficiencies up to 10.0% at a 390 eV photon energy and with diameters in the range 80 to 120 μm. Zone plates with outer zones of 18 to 20 nm were also fabricated in thinner Ni with correspondingly lower efficiencies of 2.6%. Zone plates with outermost zone widths of 45 nm have been fabricated with larger diameters up to 160 μm. All results reported were obtained with a 50 kV system with 80 μm field deflection size; future efforts will make use of a 100 kV, 500 μm field size system

  19. Overcoming bottlenecks in the membrane protein structural biology pipeline.

    Science.gov (United States)

    Hardy, David; Bill, Roslyn M; Jawhari, Anass; Rothnie, Alice J

    2016-06-15

    Membrane proteins account for a third of the eukaryotic proteome, but are greatly under-represented in the Protein Data Bank. Unfortunately, recent technological advances in X-ray crystallography and EM cannot account for the poor solubility and stability of membrane protein samples. A limitation of conventional detergent-based methods is that detergent molecules destabilize membrane proteins, leading to their aggregation. The use of orthologues, mutants and fusion tags has helped improve protein stability, but at the expense of not working with the sequence of interest. Novel detergents such as glucose neopentyl glycol (GNG), maltose neopentyl glycol (MNG) and calixarene-based detergents can improve protein stability without compromising their solubilizing properties. Styrene maleic acid lipid particles (SMALPs) focus on retaining the native lipid bilayer of a membrane protein during purification and biophysical analysis. Overcoming bottlenecks in the membrane protein structural biology pipeline, primarily by maintaining protein stability, will facilitate the elucidation of many more membrane protein structures in the near future. PMID:27284049

  20. Structural study of the uranyl and rare earth complexation functionalized by the CMPO

    International Nuclear Information System (INIS)

    In view of reducing the volume of nuclear waste solutions, a possible way is to extract simultaneously actinide and lanthanide ions prior to their ulterior separation.. Historically, the two extractant families used for nuclear waste reprocessing are the phosphine oxides and the CMPO (Carbamoyl Methyl Phosphine Oxide). For a better understanding of the complexes formed during extraction, we undertook structural studies of the complexes formed between uranyl and lanthanide (III) ions and the two classes of ligands cited above. These studies have been performed by X-ray diffraction on single crystals. Recently, a new type of extractants of lanthanide (III) and actinide (III) ions has been developed. When the Organic macrocycle called calixarene (an oligomeric compound resulting from the poly-condensation of phenolic units) is functionalized by a CMPO ligand, the extracting power, in terms of yield and selectivity towards lightest lanthanides, is greatly enhanced compared to the one measured for the single CMPO. Our X-ray diffraction studies allowed us to characterise, in terms of stoichiometry and monodentate or bidentate coordination mode of the CMPO functions, the complexes of calix[4]arene-CMPO (with four phenolic units) with lanthanide nitrates and uranyl. These different steps of characterisation enabled us to determine the correlation between the structures of the complexes and both selectivity and exacerbation of the extracting power measured in the liquid phase. (author)

  1. Synthesis and evaluation of chromate and arsenate anions extraction ability of a N-methylglucamine derivative of calix[4]arene immobilized onto magnetic nanoparticles

    International Nuclear Information System (INIS)

    In this study, 5,17-bis-[(N-methylglucamine)methyl]-25,26,27,28-tetrahydroxy-calix[4]arene (3) was synthesized by the treatment of calix[4]arene with a secondary amine N-methylglucamine and formaldehyde. The calixarene derivative (3) was characterized by a combination of FTIR, 1H NMR and elemental analyses. Followingly, using the macrocyclic building block, the compound 3 was immobilized by [3-(2,3-epoxypropoxy)propyl]trimethoxysilane-modified Fe3O4 magnetite nanoparticles (EPPTMS-MN). The prepared calix[4]arene immobilized material was characterized by a combination of Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and thermogravimetric analyses (TGA). Moreover, the studies regarding the removal of arsenate and dichromate ions from the aqueous solutions were also carried out by using the compound in solid-liquid extraction experiments. It was found that the calix[4]arene-based magnetic material has high extraction ability towards dichromate and arsenate anions in 66% (at pH 1.5) and in 86% (at pH 3.5), respectively.

  2. R and D on HLW partitioning at Khlopin Radium Institute

    International Nuclear Information System (INIS)

    Results of more than thirty-years investigations on high level radioactive wastes (HLW) partitioning at Khlopin Radium Institute (KRI), St-Petersburg are observed and discussed. The objective of research and development is to assess HLW partitioning technical feasibility and advantages over the direct vitrification of long-lived radionuclides. Many technological flowsheets for long-lived nuclides, (cesium, strontium and minor actinides) separation, were developed and tested with simulated and actual HLW. Different classes of extractants, including phosphine oxides, carbamoylphosphineoxides, phosphorus - containing calixarenes, crown ethers, dialkylphosphoric acids, diamides of heterocyclic acids were studied at KRI. Many extraction systems on the base of chlorinated cobalt dicarbollide, including UNEX-extractant and it's modifications, also observed. Diamides of 2,6 pyridinedicarboxylic acid and diamides of 2,2' ,6,6' dipyridyl dicarboxylic acid demonstrates very promising properties for minor actinide-lanthanide separation. Comparison of different solvents and possible ways for implementation of new flowsheets in radiochemical technology is also discussed. (author)

  3. Development of a V-shape bis(tetraoxacalix[2]arene[2]triazine) stationary phase for high performance liquid chromatography.

    Science.gov (United States)

    Hu, Kai; Feng, Suxiang; Wu, Mingxia; Wang, Shuang; Zhao, Wenjie; Jiang, Qiong; Yu, Ajuan; Zhang, Shusheng

    2014-12-01

    A new stationary phase for high-performance liquid chromatography was prepared by covalently bonding a V-shape cage heteroatom-bridged calixarene onto silica gel using 3-aminopropyltriethoxysilane as coupling reagent. The structure of the new material was characterized by infrared spectroscopy, elemental analysis and thermogravimetric analysis. Linear solvation energy relationship method was successfully employed to evaluate the new phase with a set of 34 solutes. The retention characteristic of the new phase shows significant similarities with ODS, as well as distinctive features. Multiple mechanisms including hydrophobic, hydrogen bonding, π-π and n-π interaction are involved. The chromatographic behavior of the phase was illustrated by using alkylbenzenes, aromatics positional isomers and flavonoids as probes. Moreover, inorganic anions were individually separated in anion-exchange mode by using the same column. Thus, multi-interaction mechanisms and mixed-mode separation of the new phase can very likely guarantee its excellent chromatographic performance for the analysis of complex samples. The column has been successfully employed for the analysis of clenbuterol in animal urine, and it is demonstrated to be suitable and a competitive alternative analytical method for the determination of clenbuterol. PMID:25159380

  4. Improvement of catalytic activity of Candida rugosa lipase in the presence of calix[4]arene bearing iminodicarboxylic/phosphonic acid complexes modified iron oxide nanoparticles.

    Science.gov (United States)

    Ozyilmaz, Elif; Bayrakci, Mevlut; Yilmaz, Mustafa

    2016-04-01

    In the present study, iron oxide magnetite nanoparticles, prepared through a co-precipitation method, were coated with phosphonic acid or iminodicarboxylic acid derivatives of calix[4]arene to modulate their surfaces with different acidic groups. Candida rugosa lipase was then directly immobilized onto the modified nanoparticles through sol-gel encapsulation. The catalytic activities and enantioselectivities of the two encapsulated lipases in the hydrolysis reaction of (R/S)-naproxen methyl ester and (R/S)-2-phenoxypropionic acid methyl ester were assessed. The results showed that the activity and enantioselectivity of the lipase were improved when the lipase was encapsulated in the presence of calixarene-based additives; the encapsulated lipase with the phosphonic acid derivative of calix[4]arene had an excellent rate of enantioselectivity against the (R/S)-naproxen methyl and (R/S)-2-phenoxypropionic acid methyl esters, with E=350 and 246, respectively, compared to the free enzyme. The encapsulated lipases (Fe-Calix-N(COOH)) and (Fe-Calix-P) showed good loading ability and little loss of enzyme activity, and the stability of the catalyst was very good; they only lost 6-11% of the enzyme's activity after five batches. PMID:26698535

  5. Molecular Dynamics Simulations on the solvation and interfacial behaviour of hydrophobic species. Applications to the TATB hypothesis and to the liquid/liquid extraction of cations to supercritical CO2

    International Nuclear Information System (INIS)

    We report molecular dynamics studies on the solvation of charged hydrophobic molecules in pure liquids and at liquid / liquid interfaces. The first part of the thesis deals with the TATB hypothesis according to which the Asφ4+ (TA+) and Bφ4- (TB-) ions have the same free energy of solvation in any solvent. The two ions are found to be solvated differently in pure liquids (water, chloroform, acetonitrile) as at a chloroform / water interface. These results are confirmed by free energy calculations and by simulations on iso-volume spherical S+ and S- ions, which perfectly meet the TATB criteria. The many methodological tests performed show the importance of (i) the corrected treatment of 'long range interactions' (ii) the precise repartition of atomic charges (iii) the solvent models, especially for water, on the + / - charge discrimination by solvent. In the second part, in relation to the liquid / liquid extraction of cations from water to supercritical CO2, we report the behaviour of ions (Cs+, UO22+, Eu3+), of un-complexed extractants molecules (tri-n-butylphosphate, calixarene), of their complexes with the cations and nitric acid at a preformed chloroform / water interface and during de-mixing simulations which started from a perfectly mixed CO2 / water solutions. These studies demonstrate the importance of interfacial phenomena, of simulation conditions and acid and extractant concentrations, in assisted ion extraction to supercritical CO2. (author)

  6. Sugared biomaterial binding lectins: achievements and perspectives.

    Science.gov (United States)

    Bojarová, P; Křen, V

    2016-07-19

    Lectins, a distinct group of glycan-binding proteins, play a prominent role in the immune system ranging from pathogen recognition and tuning of inflammation to cell adhesion or cellular signalling. The possibilities of their detailed study expanded along with the rapid development of biomaterials in the last decade. The immense knowledge of all aspects of glycan-lectin interactions both in vitro and in vivo may be efficiently used in bioimaging, targeted drug delivery, diagnostic and analytic biological methods. Practically applicable examples comprise photoluminescence and optical biosensors, ingenious three-dimensional carbohydrate microarrays for high-throughput screening, matrices for magnetic resonance imaging, targeted hyperthermal treatment of cancer tissues, selective inhibitors of bacterial toxins and pathogen-recognising lectin receptors, and many others. This review aims to present an up-to-date systematic overview of glycan-decorated biomaterials promising for interactions with lectins, especially those applicable in biology, biotechnology or medicine. The lectins of interest include galectin-1, -3 and -7 participating in tumour progression, bacterial lectins from Pseudomonas aeruginosa (PA-IL), E. coli (Fim-H) and Clostridium botulinum (HA33) or DC-SIGN, receptors of macrophages and dendritic cells. The spectrum of lectin-binding biomaterials covered herein ranges from glycosylated organic structures, calixarene and fullerene cores over glycopeptides and glycoproteins, functionalised carbohydrate scaffolds of cyclodextrin or chitin to self-assembling glycopolymer clusters, gels, micelles and liposomes. Glyconanoparticles, glycan arrays, and other biomaterials with a solid core are described in detail, including inorganic matrices like hydroxyapatite or stainless steel for bioimplants. PMID:27075026

  7. Molecular Dynamics Simulations on the solvation and interfacial behaviour of hydrophobic species. Applications to the TATB hypothesis and to the liquid/liquid extraction of cations to supercritical CO{sub 2}; Simulations par dynamique moleculaire de la solvatation et du comportement interfacial d'especes hydrophobes: application a l'hypothese TATB et a l'extraction liquide/liquide de cations par le CO{sub 2} supercritique

    Energy Technology Data Exchange (ETDEWEB)

    Schurhammer, R

    2001-12-15

    We report molecular dynamics studies on the solvation of charged hydrophobic molecules in pure liquids and at liquid / liquid interfaces. The first part of the thesis deals with the TATB hypothesis according to which the As{phi}{sub 4}{sup +} (TA{sup +}) and B{phi}{sub 4}{sup -} (TB{sup -}) ions have the same free energy of solvation in any solvent. The two ions are found to be solvated differently in pure liquids (water, chloroform, acetonitrile) as at a chloroform / water interface. These results are confirmed by free energy calculations and by simulations on iso-volume spherical S{sup +} and S{sup -} ions, which perfectly meet the TATB criteria. The many methodological tests performed show the importance of (i) the corrected treatment of 'long range interactions' (ii) the precise repartition of atomic charges (iii) the solvent models, especially for water, on the + / - charge discrimination by solvent. In the second part, in relation to the liquid / liquid extraction of cations from water to supercritical CO{sub 2}, we report the behaviour of ions (Cs{sup +}, UO{sub 2}{sup 2+}, Eu{sup 3+}), of un-complexed extractants molecules (tri-n-butylphosphate, calixarene), of their complexes with the cations and nitric acid at a preformed chloroform / water interface and during de-mixing simulations which started from a perfectly mixed CO{sub 2} / water solutions. These studies demonstrate the importance of interfacial phenomena, of simulation conditions and acid and extractant concentrations, in assisted ion extraction to supercritical CO{sub 2}. (author)

  8. Fission product solvent extraction

    International Nuclear Information System (INIS)

    Two main objectives concerning removal of fission products from high-level tank wastes will be accomplished in this project. The first objective entails the development of an acid-side Cs solvent-extraction (SX) process applicable to remediation of the sodium-bearing waste (SBW) and dissolved calcine waste (DCW) at INEEL. The second objective is to develop alkaline-side SX processes for the combined removal of Tc, Cs, and possibly Sr and for individual separation of Tc (alone or together with Sr) and Cs. These alkaline-side processes apply to tank wastes stored at Hanford, Savannah River, and Oak Ridge. This work exploits the useful properties of crown ethers and calixarenes and has shown that such compounds may be economically adapted to practical processing conditions. Potential benefits for both acid- and alkaline-side processing include order-of-magnitude concentration factors, high rejection of bulk sodium and potassium salts, and stripping with dilute (typically 10 mM) nitric acid. These benefits minimize the subsequent burden on the very expensive vitrification and storage of the high-activity waste. In the case of the SRTALK process for Tc extraction as pertechnetate anion from alkaline waste, such benefits have now been proven at the scale of a 12-stage flowsheet tested in 2-cm centrifugal contactors with a Hanford supernatant waste simulant. SRTALK employs a crown ether in a TBP-modified aliphatic kerosene diluent, is economically competitive with other applicable separation processes being considered, and has been successfully tested in batch extraction of actual Hanford double-shell slurry feed (DSSF)

  9. CMPO-calix[4]arenes with spacer containing intramolecular hydrogen bonding: Effect of local rigidification on solvent extraction toward f-block elements

    International Nuclear Information System (INIS)

    Highlights: • Three CMPO-calix[4]arenes with spacer containing intramolecular hydrogen bonds were designed and synthesized. • The influence of local rigidification caused by intramolecular hydrogen bonds upon extraction of f-elements was investigated. • Selective extraction is realized via tuning local chelating surroundings by aid of intramolecular hydrogen bonds. -- Abstract: To understand intramolecular hydrogen bonding in effecting liquid–liquid extraction behavior of CMPO-calixarenes, three CMPO-modified calix[4]arenes (CMPO-CA) 5a–5c with hydrogen-bonded spacer were designed and synthesized. The impact of spacer rotation that is hindered by introduction of intramolecular hydrogen bonding upon extraction of La3+, Eu3+, Yb3+, Th4+, and UO22+ has been examined. The results show that 5b and 5c containing only one hydrogen bond with a less hindered rotation spacer extract La3+ more efficiently than 5a containing two hydrogen bonds with a more hindered rotation spacer, demonstrating the importance of local rigidification of spacer in the design of extractants in influencing the coordination environment. The large difference in extractability between La3+ and Yb3+ (or Eu3+) by 5b (or 5c), and the small difference by 5a, suggests intramolecular hydrogen bonding do exert pronounced influence upon selective extraction of light and heavy lanthanides. Log–log plot analysis indicates a 1:1, 2:1 and 1:1 stoichiometry (ligand/metal) for the extracted complex formed between 5b and La3+, Th4+, UO22+, respectively. Additionally, their corresponding acyclic analogs 7a–7c exhibit negligible extraction toward these metal ions. These results reveal the possibility of selective extraction via tuning local chelating surroundings of CMPO-CA by aid of intramolecular hydrogen bonding

  10. CMPO-calix[4]arenes with spacer containing intramolecular hydrogen bonding: Effect of local rigidification on solvent extraction toward f-block elements

    Energy Technology Data Exchange (ETDEWEB)

    Chu, Hongzhu; He, Lutao; Jiang, Qian; Fang, Yuyu; Jia, Yiming; Yuan, Xiangyang; Zou, Shuliang; Li, Xianghui [Key Laboratory for Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, College of Chemistry, Sichuan University, Chengdu 610064 (China); Feng, Wen, E-mail: wfeng9510@scu.edu.cn [Key Laboratory for Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, College of Chemistry, Sichuan University, Chengdu 610064 (China); Yang, Yuanyou; Liu, Ning [Key Laboratory for Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, College of Chemistry, Sichuan University, Chengdu 610064 (China); Luo, Shunzhong; Yang, Yanqiu; Yang, Liang [Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900 (China); Yuan, Lihua, E-mail: lhyuan@scu.edu.cn [Key Laboratory for Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, College of Chemistry, Sichuan University, Chengdu 610064 (China)

    2014-01-15

    Highlights: • Three CMPO-calix[4]arenes with spacer containing intramolecular hydrogen bonds were designed and synthesized. • The influence of local rigidification caused by intramolecular hydrogen bonds upon extraction of f-elements was investigated. • Selective extraction is realized via tuning local chelating surroundings by aid of intramolecular hydrogen bonds. -- Abstract: To understand intramolecular hydrogen bonding in effecting liquid–liquid extraction behavior of CMPO-calixarenes, three CMPO-modified calix[4]arenes (CMPO-CA) 5a–5c with hydrogen-bonded spacer were designed and synthesized. The impact of spacer rotation that is hindered by introduction of intramolecular hydrogen bonding upon extraction of La{sup 3+}, Eu{sup 3+}, Yb{sup 3+}, Th{sup 4+}, and UO{sub 2}{sup 2+} has been examined. The results show that 5b and 5c containing only one hydrogen bond with a less hindered rotation spacer extract La{sup 3+} more efficiently than 5a containing two hydrogen bonds with a more hindered rotation spacer, demonstrating the importance of local rigidification of spacer in the design of extractants in influencing the coordination environment. The large difference in extractability between La{sup 3+} and Yb{sup 3+} (or Eu{sup 3+}) by 5b (or 5c), and the small difference by 5a, suggests intramolecular hydrogen bonding do exert pronounced influence upon selective extraction of light and heavy lanthanides. Log–log plot analysis indicates a 1:1, 2:1 and 1:1 stoichiometry (ligand/metal) for the extracted complex formed between 5b and La{sup 3+}, Th{sup 4+}, UO{sub 2}{sup 2+}, respectively. Additionally, their corresponding acyclic analogs 7a–7c exhibit negligible extraction toward these metal ions. These results reveal the possibility of selective extraction via tuning local chelating surroundings of CMPO-CA by aid of intramolecular hydrogen bonding.

  11. Oxovanadium(V) tetrathiacalix[4]arene complexes and their activity as oxidation catalysts.

    Science.gov (United States)

    Hoppe, Elke; Limberg, Christian

    2007-01-01

    With the aim of modeling reactive moieties and relevant intermediates on the surfaces of vanadium oxide based catalysts during oxygenation/dehydrogenation of organic substrates, mono- and dinuclear vanadium oxo complexes of doubly deprotonated p-tert-butylated tetrathiacalix[4]arene (H4TC) have been synthesized and characterized: PPh4[(H2TC)VOCl(2)] (1) and (PPh4)2[{(H2TC)V(O)(mu-O)}2] (2). According to the NMR spectra of the dissolved complexes they both retain the structures adopted in the crystalline state, as revealed by single-crystal X-ray crystallography. Compounds 1 and 2 were tested as catalysts for the oxidation of alcohols with O(2) at 80 degrees C. Both 1 and 2 efficiently catalyze the oxidation of benzyl alcohol, crotyl alcohol, 1-phenyl-1-propanol, and fluorenol, and in most cases dinuclear complex 2 is more active than mononuclear complex 1. Moreover, the two thiacalixarene complexes 1 and 2 are in many instances more active than oxovanadium(V) complexes containing "classical" calixarene ligands tested previously. Complexes 1 and 2 also show significant activity in the oxidation of dihydroanthracene. Further investigations led to the conclusion that 1 acts as precatalyst that is converted to the active species PPh4[(TC)V==O] (3) at 80 degrees C by double intramolecular HCl elimination. For complex 2, the results of mechanistic investigations indicated that the oxidation chemistry takes place at the bridging oxo ligands and that the two vanadium centers cooperate during the process. The intermediate (PPh4)2[{H2TCV(O)}2(mu-OH)(mu-OC13H9)] (4) was isolated and characterized, also with respect to its reactivity, and the results afforded a mechanistic proposal for a reasonable catalytic cycle. The implications which these findings gathered in solution may have for oxidation mechanisms on the surfaces of V-based heterogeneous catalysts are discussed. PMID:17566134

  12. Caustic-Side Solvent Extraction: Chemical and Physical Properties of the Optimized Solvent

    Energy Technology Data Exchange (ETDEWEB)

    Delmau, L.H.

    2002-10-08

    This work was undertaken to optimize the solvent used in the Caustic Side Solvent Extraction (CSSX) process and to measure key chemical and physical properties related to its performance in the removal of cesium from the alkaline high-level salt waste stored in tanks at the Savannah River Site. The need to adjust the solvent composition arose from the prior discovery that the previous baseline solvent was supersaturated with respect to the calixarene extractant. The following solvent-component concentrations in Isopar{reg_sign} L diluent are recommended: 0.007 M calix[4]arene-bis(tert-octylbenzo-crown-6) (BOBCalixC6) extractant, 0.75 M 1-(2,2,3,3-tetrafluoropropoxy)-3-(4-sec-butylphenoxy)-2-propanol (Cs-7SB) phase modifier, and 0.003 M tri-n-octylamine (TOA) stripping aid. Criteria for this selection included BOBCalixC6 solubility, batch cesium distribution ratios (D{sub Cs}), calculated flowsheet robustness, third-phase formation, coalescence rate (dispersion numbers), and solvent density. Although minor compromises within acceptable limits were made in flowsheet robustness and solvent density, significant benefits were gained in lower risk of third-phase formation and lower solvent cost. Data are also reported for the optimized solvent regarding the temperature dependence of D{sub Cs} in extraction, scrubbing, and stripping (ESS); ESS performance on recycle; partitioning of BOBCalixC6, Cs-7SB, and TOA to aqueous process solutions; partitioning of organic anions; distribution of metals; solvent phase separation at low temperatures; solvent stability to elevated temperatures; and solvent density and viscosity. Overall, the technical risk of the CSSX process has been reduced by resolving previously identified issues and raising no new issues.

  13. Energy-resolved collision-induced dissociation of non-covalent ions: charge- and guest-dependence of decomplexation reaction efficiencies.

    Science.gov (United States)

    Carroy, Glenn; Lemaur, Vincent; De Winter, Julien; Isaacs, Lyle; De Pauw, Edwin; Cornil, Jérôme; Gerbaux, Pascal

    2016-05-14

    Supramolecular chemistry, and especially host-guest chemistry, has been the subject of great interest in the past few decades leading to the synthesis of host cage molecules such as calixarenes, cyclodextrins and more recently cucurbiturils. Mass spectrometry methods are increasingly used to decipher at the molecular level the non-covalent interactions between the different associated molecules. The present article illustrates that the association between mass spectrometry and computational chemistry techniques proves very complementary to depict the gas-phase dissociation processes of ionic non-covalent complexes when subjected to collisional activation. The selected system associates a nor-seco-cucurbit[10]uril bitopic receptor with different amino compounds (adamantylamine, para-xylylenediamine, and para-phenylenediamine). When subjected to CID experiments, the ternary complexes undergo fragmentation via dissociation of non-covalently bound partners. Interestingly, depending on their charge state, the collisionally excited complexes can selectively expel either a neutral guest molecule or a protonated guest molecule. Moreover, based on energy-resolved CID experiments, it is possible to evaluate the guest molecule dependence on the gas phase dissociation efficiency. We observed that the relative order of gas phase dissociation is charge state dependent, with the adamantylamine-containing complexes being the weakest when triply charged and the strongest when doubly charged. The energetics of the gas-phase dissociation reactions have been estimated by density functional theory (DFT) calculations. We succeeded in theoretically rationalizing the experimental collision-induced dissociation results with a special emphasis on: (i) the charge state of the expelled guest molecule and (ii) the nature of the guest molecule. PMID:27086657

  14. Acid-base controllable recognition properties of a highly versatile calix[6]crypturea.

    Science.gov (United States)

    Ménand, Mickaël; Jabin, Ivan

    2010-02-15

    Versatile concave receptors with binding properties that can be controlled by external stimuli are rare. Herein, we report on a calix[6]crypturea (1) that features two different binding sites in close proximity, that is, a tris(2-aminoethyl)amine (tren)-based tris-ureido cap that provides convergent hydrogen-bond-donor sites and a hydrophobic cavity suitable for the inclusion of organic guests. The binding properties of this heteroditopic receptor have been evaluated by NMR spectroscopic studies. Compound 1 behaves as a remarkably versatile host that strongly binds neutral molecules, anions, or contact ion pairs. Within each family of guests, compound 1 is able to discriminate between different guests with a high degree of selectivity. Indeed, neutral molecules that possess hydrogen-bond donor and acceptor groups, chloride anions, and linear ammonium ions associated to F(-) or Cl(-) are particularly well recognized. In comparison with all the related receptors, compound 1 displays several unique features: 1) charged or neutral species are also recognized in polar or protic solvents, 2) thanks to the flexibility of the calixarene structure, induced-fit processes allow the binding of large, biologically relevant ammonium salts such as neurotransmitters, and 3) the protonation of the basic cap leads to a positively charged receptor, 1.H(+), which is reluctant to host anions and in which host properties are now governed by strong charge-dipole interactions with the guests. In other words, compound 1 presents an acid-base controllable tris-ureido recognition site protected by a hydrophobic corridor that can select guests through induced-fit processes. Thus, its versatile host properties can be allosterically controlled by protonation and selective guest-switching processes are possible. To illustrate all these remarkable features, a sophisticated three-pole supramolecular switch, based on the interconversion of host-guest systems displaying either charged or neutral

  15. Modification of photoelectrode with thiol-functionalized Calix[4]arenes as interface energy barrier for high efficiency in dye-sensitized solar cells

    Science.gov (United States)

    Akın, Seçkin; Gülen, Mahir; Sayın, Serkan; Azak, Hacer; Yıldız, Hüseyin Bekir; Sönmezoğlu, Savaş

    2016-03-01

    We successfully synthesize a series of bis-thiol-substituted calix[4]arene derivatives bearing diverse groups on the upper-rim/lower-rim (C@SH-1, C@SH-2, C@SH-3, C@SH-4, C@SH-5). For the first time, we apply these derivatives as interface modifiers for improving the photovoltaic response of a Ru-bipy dye (N-719)-sensitized TiO2 photoanode in dye-sensitized solar cells (DSSCs). We use FT-IR, H- and C-NMR, UV-vis spectrophotometry, and elemental analysis techniques to characterize the structures of the calix[4]arene derivatives. We achieve an overall photon-to-electron conversion efficiency (PCE) of 12.97% with the DSSCs based on 25,27-bis(5-thiol-1-oxypentane)-26,28-dihydroxycalix[4]arene (C@SH-3)-modified TiO2 photoanode (Jsc = 9.49 mA cm-2, Voc = 672 mV, FF = 61.1%) compared with a system of bare TiO2 (PCE: 6.82%) under AM 1.5G illumination of 300 W/m2. In addition, we also study the influence of the chain length (C@SH-2; with 3 carbons and C@SH-3; with 5 carbons) and subsidiary ligand groups such as alkyl (C@SH-1), nitro (C@SH-4), and amine (C@SH-5) on the surface morphology, spectral response, and photovoltaic performance. Our results reveal that the C@SH-3 calixarene is the best derivative for modifiying the TiO2 photoanode. Thiol-functionalized Calix[4]arene molecules play a role in assisting charge separation and preventing back recombination, which accounts for the observed enhancement in photovoltaic performance.

  16. Development of the Next-Generation Caustic-Side Solvent Extraction (NG-CSSX) Process for Cesium Removal from High-Level Tank Waste

    International Nuclear Information System (INIS)

    This paper describes the chemical performance of the Next-Generation Caustic-Side Solvent Extraction (NG-CSSX) process in its current state of development for removal of cesium from the alkaline high-level tank wastes at the Savannah River Site (SRS) in the US Department of Energy (USDOE) complex. Overall, motivation for seeking a major enhancement in performance for the currently deployed CSSX process stems from needs for accelerating the cleanup schedule and reducing the cost of salt-waste disposition. The primary target of the NG-CSSX development campaign in the past year has been to formulate a solvent system and to design a corresponding flowsheet that boosts the performance of the SRS Modular CSSX Unit (MCU) from a current minimum decontamination factor of 12 to 40,000. The chemical approach entails use of a more soluble calixarene-crown ether, called MaxCalix, allowing the attainment of much higher cesium distribution ratios (DCs) on extraction. Concurrently decreasing the Cs-7SB modifier concentration is anticipated to promote better hydraulics. A new stripping chemistry has been devised using a vitrification-friendly aqueous boric acid strip solution and a guanidine suppressor in the solvent, resulting in sharply decreased DCs on stripping. Results are reported herein on solvent phase behavior and batch Cs distribution for waste simulants and real waste together with a preliminary flowsheet applicable for implementation in the MCU. The new solvent will enable MCU to process a much wider range of salt feeds and thereby extend its service lifetime beyond its design life of three years. Other potential benefits of NG-CSSX include increased throughput of the SRS Salt Waste Processing Facility (SWPF), currently under construction, and an alternative modular near-tank application at Hanford.

  17. Theory of circular dichroism of nanomaterials comprising chiral molecules and nanocrystals: plasmon enhancement, dipole interactions, and dielectric effects.

    Science.gov (United States)

    Govorov, Alexander O; Fan, Zhiyuan; Hernandez, Pedro; Slocik, Joseph M; Naik, Rajesh R

    2010-04-14

    Our calculations show that a nonchiral nanocrystal is able to dramatically change the circular dichroism (CD) of a chiral molecule when the nanocrystal and molecule form a complex and couple via dipole and multipole Coulomb interactions. Plasmon resonances of metal nanocrystals in the nanocrystal-molecule complex result in both the resonant enhancement of CD signals of molecules and the appearance of new spectral structures. Two mechanisms, in which a nanocrystal can influence the CD effect, have been identified. The first mechanism is the plasmon-induced change in the electromagnetic field inside the chiral molecule. The second is the optical absorption of the nanocrystal-molecule complex due to the chiral currents inside the metal nanocrystal induced by the dipole of the chiral molecule. The first mechanism creates a change in the angle between the effective electric and magnetic dipoles of the molecule. This mechanism can lead to symmetry breaking and to a plasmon-induced CD signal of the nonchiral molecule. Both mechanisms create interesting Fano-like shapes in the CD spectra. Importantly, the second mechanism gives the main contribution to the CD signal at the plasmon frequency when the absorption band of the chiral molecule is far from the plasmon resonance. This may happen in many cases since many biomolecules are optically active in the UV range, whereas plasmon resonances in commonly used nanometals are found at longer wavelengths. As concrete examples, the paper describes alpha-helix and calixarene ligand molecules coupled with metal nanocrystals. The above results are also applied to complexes incorporating semiconductor nanocrystals. The results obtained here can be used to design a variety of hybrid nanostructures with enhanced and tailored optical chirality in the visible wavelength range. PMID:20184381

  18. Macrocyclic compound as ionophores in lead(Ⅱ)ion-selective electrodes with excellent response characteristics

    Institute of Scientific and Technical Information of China (English)

    HUANG MeiRong; MA XiaoLi; LI XinGui

    2008-01-01

    Macrocyclic compounds, such as crown ethers, azacrown ethers, thiacrown ethers, calixarenes and porphyrins, which act as ionophores in lead(Ⅱ) ion-selective electrodes, are systematically summarized based on the latest literatures. The molecular structure characteristics of the ionophores are general-ized. The modification regulations for the substituted ionophores are elaborated with the purpose ofimproving the response features of the lead(Ⅱ) ion-selective electrodes assembled by them. It is pointed out that the introduction of pendant moieties which contain soft base coordination centers like N, S and P atoms is in favor of adjusting the cavity size and conformation of the macrocyclic com-pounds. Furthermore, there is synergic effect between the cavity and the donor sites of the ligand and thus the selective complexation of lead ions is easily realized, resulting in significant avoidance of the interference from other metal ions. The macrocyclic ionophore having the best response characteris-tics thus far was found to be N,N'-dimethylcyanodiaza-18-crown-6 with the detection limit of 7.0×10-8 (14.5 μg/L), which is one of the uncommon ionophores that can really eliminate the interference from silver and mercury ions. The selectivity coefficients of the ionophore for lead ions over other metal ions, such as alkali, alkaline earth and transition metal ions are in the order of 10-4 or smaller, where the se-lectivity coefficient of lead(Ⅱ) over mercury(Ⅱ) ions is much lower, down to 8.9×10-4. The structure de-sign idea for high-performance ionophore is proposed according to present results. The incorporation of nitrogen atom, especially cyano group or thiocyano group or amino/imino groups, rather than thio atom alone could result in new excellent lead ionophores. The aborative design for metacyclophanes containing aromatic nitrogen atoms with the aim of creating excellent ionophores would also become a potential research trend. The lead(Ⅱ) ion

  19. Multidisciplinary approach and multi-scale elemental analysis and separation chemistry

    International Nuclear Information System (INIS)

    The development of methods for the analysis of trace elements is an important component of my research activities either for a radiometric measure or mass spectrometric detection. Many studies raise the question of the chemical signature of a sample or a process: eruptive behavior of a volcano, indicator of pollution, ion exchange in vectors vesicles of active principles,... Each time, highly sensitive analytical procedures, accurate and multi-elementary as well as the development of specific protocols were needed. Neutron activation analysis has often been used as reference procedure and allowed to validate the chemical lixiviation and the measurement by ICP-MS. Analysis of radioactive samples requires skills in analysis of trace but also separation chemistry. Two separation methods occupy an important place in the separation chemistry of radionuclides: chromatography and liquid-liquid extraction. The study of extraction of Lanthanide (III) by the oxide octyl (phenyl)-n, N-diisobutyl-carbamoylmethyl phosphine (CMPO) and a calixarene-CMPO led to better understand and quantify the influence of operating conditions on their performance of extraction and selectivity. The high concentration of salts in aqueous solutions required to reason in terms of thermodynamic activities in relying on a comprehensive approach to quantification of deviations from ideality. In order to reduce the amount of waste generated and costs, alternatives to the hydrometallurgical extraction processes were considered using ionic liquids at low temperatures as alternative solvents in biphasic processes. Remaining in this logic of effluent reduction, miniaturization of the liquid-liquid extraction is also study so as to exploit the characteristics of microscopic scale (very large specific surface, short diffusion distances). The miniaturization of chromatographic separations carries the same ambitions of gain of volumes of wastes and reagents. The miniaturization of the separation Uranium

  20. Norbadione A: Kinetics and Thermodynamics of Cesium Uptake in Aqueous and Alcoholic Media

    International Nuclear Information System (INIS)

    Norbadione A (NbA) is a mushroom pigment, which is assumed to be involved in 137Cs accumulation all over Europe during the Chernobyl nuclear accident. NbA bears seven acid-base functional groups, among which are two enolic and two carboxylic acid moieties. This work deals with complex formation of Cs+ and NbA in ethanol, ethanol/water (9:1) (M1), and water with, when required, the support of two Cs+ ionophore probes, calix[4]arene-bis(crown-6-ether)dioxy-coumarine (A1) and its tetra-sulfonated form (A2). In ethanol, two Cs+ complexes are formed, with the affinity constants K1EtOH= (1.1±0.25) * 105 and K2EtOH= (2.1 ± 0.4) * 103. In M1, a single Cs+ complex occurs when only the enols are deprotonated, whereas a bi-complex is formed when both enols and carboxylic acids are deprotonated: K1M1= (1.5 ± 0.3) * 105 and K2M1= (4 ± 2) * 103. These data are confirmed by stopped-flow and T-jump kinetics. In ethanol, a fast Cs+ exchange occurs between NbA and A1: direct rate constant, k1 =(3.1 ± 0.1) * 107 M-1 s-1; reverse rate constant k-1 =(2.8 ±1) * 105 M-1 s-1; and Cs+ exchange constant, K1Exchange =(9 ± 4)*10-3. In M1, the quenching of A2 fluorescence by NbA is used to determine the kinetics of complex formation with Cs+: k2 =(1.8 ± 0.4) * 109 M-1 s-1; k-2 =(1.80 ± 0.15) * 104 s-1; and K1M1 = (1.5 ± 0.5) * 105. The affinity of NbA for Cs+ is probably the result of the particular structure in which the two pulvinic acid arms adopt a conformation that forms two complexation sites composed of the two enolates and/or the two carboxylates. This renders the efficiency in Cs+ uptake comparable to that of some calixarenes or crown ethers. (authors)

  1. 典型超分子体系在放射化学领域的应用%Applications of Typical Supramolecular Systems in the Field of Radiochemistry

    Institute of Scientific and Technical Information of China (English)

    沈兴海; 张京晶; 高嵩; 付素珍; 孙涛祥; 付婧; 张红娟; 陈庆德; 高宏成

    2011-01-01

    本文主要通过评述两类超分子体系和离子印迹聚合物对重要金属离子的分离研究,阐明超分子化学在放射化学领域的重要应用。第一类超分子体系所含的主体分子有冠醚、杯芳烃、杯芳冠醚等大环化合物。第二类超分子体系主要有反胶束、微乳液和液膜。离子印迹聚合物通过超分子的识别功能实现对离子的选择性分离,而在液膜分离技术中,超分子的输运功能得到了很好的诠释。本文还对超分子化学在放射化学领域的应用前景作了分析展望。%Supramolecular chemistry is defined as "chemistry beyond the molecule",bearing on the organized entities of higher complexity that result from the association of two or more chemical species held together by intermolecular forces.Now,the applications of supramolecular chemistry in the realm of radiochemistry have attracted much attention.In this article,the separation of important metal ions by two kinds of supramolecular systems and ionic imprinted polymers(IIP) is discussed,which demonstrates the significant roles of supramolecular systems in the field of radiochemistry.Meanwhile,the first type is supermolecules resulted from the intermolecular association of a host molecule and its substrates,where the host molecules are mainly macrocyclic compounds(such as crown ethers,calixarene,calix crown ethers and so on).The second type is supramolecular assemblies induced by the spontaneous association of a large undefined number of components into a specific phase,including reversed micelles,microemulsions and liquid membranes.IIPs can recognize and separate metal ions selectively,which realizes the recognition function of supramolecular chemistry.The transport function of supramolecular chemistry is also well interpreted in the separation of metal ions by liquid membrane.Besides,the perspectives of supramolecular chemistry in the field of radiochemistry are also presented.

  2. Quantum molecular dynamics and molecular interactions studied by NMR and INS

    International Nuclear Information System (INIS)

    application of pressure was disproved. A series of NMR spectral density measurements were taken for the calixarene sample. Along with a broad incoherent feature centred about zero field, a well defined peak was observed offset from the axis. This peak is assigned to coherent translational proton tunnelling in the cyclic hydrogen bond network. (author)

  3. Research work on radionuclide partitioning from nuclear waste co-financed by the european commission

    International Nuclear Information System (INIS)

    -metallurgical processes for the selective extraction of actinides from high level waste, the first one with nitrogen polydentate ligands or acidic sulphur-bearing ligands and the second one with functionalized calixarenes. The third project will assess pyrometallurgical flowsheets to process spent fuel and targets and in particular the separation of actinides from lanthanides by either salt/metal extraction or electrorefining. This project will also involve Czech and Japanese research institutes. (author)

  4. Dispersed metal cluster catalysts by design. Synthesis, characterization, structure, and performance

    Energy Technology Data Exchange (ETDEWEB)

    Arslan, Ilke [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Dixon, David A. [Univ. of Alabama, Tuscaloosa, AL (United States); Gates, Bruce C. [Univ. of California, Davis, CA (United States); Katz, Alexander [Univ. of California, Berkeley, CA (United States)

    2015-09-30

    To understand the class of metal cluster catalysts better and to lay a foundation for the prediction of properties leading to improved catalysts, we have synthesized metal catalysts with well-defined structures and varied the cluster structures and compositions systematically—including the ligands bonded to the metals. These ligands include supports and bulky organics that are being tuned to control both the electron transfer to or from the metal and the accessibility of reactants to influence catalytic properties. We have developed novel syntheses to prepare these well-defined catalysts with atomic-scale control the environment by choice and placement of ligands and applied state-of-the art spectroscopic, microscopic, and computational methods to determine their structures, reactivities, and catalytic properties. The ligands range from nearly flat MgO surfaces to enveloping zeolites to bulky calixarenes to provide controlled coverages of the metal clusters, while also enforcing unprecedented degrees of coordinative unsaturation at the metal site—thereby facilitating bonding and catalysis events at exposed metal atoms. With this wide range of ligand properties and our arsenal of characterization tools, we worked to achieve a deep, fundamental understanding of how to synthesize robust supported and ligand-modified metal clusters with controlled catalytic properties, thereby bridging the gap between active site structure and function in unsupported and supported metal catalysts. We used methods of organometallic and inorganic chemistry combined with surface chemistry for the precise synthesis of metal clusters and nanoparticles, characterizing them at various stages of preparation and under various conditions (including catalytic reaction conditions) and determining their structures and reactivities and how their catalytic properties depend on their compositions and structures. Key characterization methods included IR, NMR, and EXAFS spectroscopies to identify

  5. Metal Vector Manipulated Molecular Self-Assembly from Werner System to Cotton System

    Institute of Scientific and Technical Information of China (English)

    YU Shu-Yan; ZHANG Zhong-Xing; HUANG Hui; LI Sheng-Hui; HUANG Hai-Ping

    2004-01-01

    A definition of metal vector was given to coordinatively unsaturated metals or asymmetrically coordinated metal complexes in which the metal center is partly blocked by inert chelating ligand(s), thus possess specific reactivity and directionality, such as cis-coordinated square Pd(Ⅱ) or Pt(Ⅱ) complexes. Metal vectors have been extensively used in coordination catalysis and molecular assembly. In 1990, Fujita [ 1 ] first demonstrated the utility of cis-coordinated square Pd(Ⅱ)or Pt(Ⅱ) complexes as a right angular 2D metal vector in the formation of molecular square, a cyclic tetramer with nano-cavity and unique molecular recognition. So far, much attention has been paid to the use of the mononuclear coordination centers (Werner-type metal vectors) in molecular assembly.As late as 1999, Cotton et al. [2] reported the use of cis-coordinated metal-metal bonded dimetal units (Cotton-type metal vectors) to direct assembly of molecular squares.This presentation includes two parts: 1) Werner-type metal vector directed molecular assembly; [3]2) Cotton-type metal vector directed molecular assembly.[4]Firstly, the Werner-type metal vector, cis-coordinated Pd(Ⅱ) nitrate, was used to direct a 6-component self-assembly. This leads to the formation of a molecular bowl or crown with syn,syn,syn conformation. These structures are analogues of calix[3]arenes and can function as anion receptors. Interestingly, an nitrate is found to distort from a trigonal plane into a trigonal pyramid when binding to the bottom of the molecular bowl.Secondly, the Cotton-type metal vector, cis-diRh(Ⅱ, Ⅱ), was used to assemble di- or poly-carboxylate anions into neutral supermolecules. Most interestingly, a calixarene-based carceplex with four cis-diRh(Ⅱ, Ⅱ) fastners was obtained[5].All self-assembling entities were studied by both X-ray crystallographic analysis and solution NMR spectra, which are consistent with the presence of assembling structures even in solution.

  6. V5 And V10 Contactor Testing With The Next Generation (CSSX) Solvent For The Savannah River Site Integrated Salt Disposition Process

    International Nuclear Information System (INIS)

    A solvent extraction system for removal of cesium (Cs) from alkaline solutions was developed utilizing a novel solvent invented at the Oak Ridge National Laboratory (ORNL). This solvent consists of a calix(4)arene-crown-6 extractant dissolved in an inert hydrocarbon matrix. A Modifier is added to the solvent to enhance the extraction power of the calixarene and to prevent the formation of a third phase. An additional additive, called a suppressor, is used to improve stripping performance. The process that deploys this solvent system is known as Caustic Side Solvent Extraction (CSSX). The solvent system has been deployed at the Savannah River Site (SRS) in the Modular CSSX Unit (MCU) since 2008. Subsequent development efforts by ORNL identified an improved solvent system that can raise the expected decontamination factor (DF) in MCU from ∼200 to more than 40,000. The improved DF is attributed to an improved distribution ratio for cesium (D(Cs)) in extraction from ∼15 to ∼60, an increased solubility of the calixarene in the solvent from 0.007 M to >0.050 M, and use of boric acid (H3BO3) stripping that also yields improved D(Cs) values. Additionally, the changes incorporated into the Next Generation CSSX Solvent (NGS) are intended to reduce solvent entrainment by virtue of more favorable physical properties. The MCU and Salt Waste Processing Facility (SWPF) facilities are actively pursuing the changeover from the current CSSX solvent to the NGS solvent. To support this integration of the NGS into the MCU and SWPF facilities, the Savannah River Remediation (SRR)/ARP/MCU Life Extension Project requested that the Savannah River National Laboratory (SRNL) perform testing of the new solvent for the removal of Cs from the liquid salt waste stream. Additionally, SRNL was tasked with characterizing both strip (20-in long, 10 micron pore size) and extraction (40-in long, 20 micron pore size) coalescers. SRNL designed a pilot-scale experimental program to test the full

  7. V5 AND V10 CONTACTOR TESTING WITH THE NEXT GENERATION (CSSX) SOLVENT FOR THE SAVANNAH RIVER SITE INTEGRATED SALT DISPOSITION PROCESS

    Energy Technology Data Exchange (ETDEWEB)

    Restivo, M.; Peters, T.; Pierce, R.; Fondeur, F.; Steeper, T.; Williams, M.; Giddings, B.; Hickman, B.; Fink, S.

    2012-01-17

    A solvent extraction system for removal of cesium (Cs) from alkaline solutions was developed utilizing a novel solvent invented at the Oak Ridge National Laboratory (ORNL). This solvent consists of a calix[4]arene-crown-6 extractant dissolved in an inert hydrocarbon matrix. A Modifier is added to the solvent to enhance the extraction power of the calixarene and to prevent the formation of a third phase. An additional additive, called a suppressor, is used to improve stripping performance. The process that deploys this solvent system is known as Caustic Side Solvent Extraction (CSSX). The solvent system has been deployed at the Savannah River Site (SRS) in the Modular CSSX Unit (MCU) since 2008. Subsequent development efforts by ORNL identified an improved solvent system that can raise the expected decontamination factor (DF) in MCU from {approx}200 to more than 40,000. The improved DF is attributed to an improved distribution ratio for cesium [D(Cs)] in extraction from {approx}15 to {approx}60, an increased solubility of the calixarene in the solvent from 0.007 M to >0.050 M, and use of boric acid (H{sub 3}BO{sub 3}) stripping that also yields improved D(Cs) values. Additionally, the changes incorporated into the Next Generation CSSX Solvent (NGS) are intended to reduce solvent entrainment by virtue of more favorable physical properties. The MCU and Salt Waste Processing Facility (SWPF) facilities are actively pursuing the changeover from the current CSSX solvent to the NGS solvent. To support this integration of the NGS into the MCU and SWPF facilities, the Savannah River Remediation (SRR)/ARP/MCU Life Extension Project requested that the Savannah River National Laboratory (SRNL) perform testing of the new solvent for the removal of Cs from the liquid salt waste stream. Additionally, SRNL was tasked with characterizing both strip (20-in long, 10 micron pore size) and extraction (40-in long, 20 micron pore size) coalescers. SRNL designed a pilot-scale experimental

  8. Radiation protection measurement techniques and the challenges encountered in industrial and medical environments

    International Nuclear Information System (INIS)

    transfer dosemeters for radiotherapy mini-beams (S. Dufreneix (CEA)); DIADOMI: diamond dosemeter for absorbed dose measurement in mini-beams used in stereotaxic radiotherapy (D. Tromson (CEA)); Use of numerical simulation for air sampling validation in the reactor building (E. Gaillard-Lecanu (EDF)); Aerosols activity monitoring inside the reactor building (A. Arnette, M. Lestang (EDF)); Improvement of the body contamination control at the controlled area exit (N. Valendru (EDF)); Usability at the service of radiation protection (J. TUR (Carmelec)); New remote solutions for radioactivity detection, monitoring and characterization (B. Leibovici (Innovation and Measurement Systems)); MARCASSIN: Mobile in-situ gamma spectroscopy for environmental radiological measurements (F. Panza (IRSN)); Environmental detection of ultra-trace amounts of radionuclides and chemical species (C. Moulin (CEA)); Environmental analysis of low-level tritium species (N. Baglan (CEA)); Alpha decay traces in effluents: from direct detection to identification (J. de Sanoit (CEA)); Use of IRSN's mobile anthropodiametry means in contaminated area (D. Broggio (IRSN)); Transuranium elements measurement in biological matrices, feces and urines (J. Lecoix (CEA)); Traceability of environmental radioactivity measurements: realisation and measurement of a labelled vegetal matrice (V. Lourenco (CEA)); Calixarene columns and ICP-MS for actinides analysis on man and in the environment (C. Bouvier (IRSN)); Cd-Zn-Te gamma spectroscopy characterization of NPPs coolant loops contamination (A. Rocher (EDF), N. Blanc De Lanaute (Canberra)); Dosimetry in criticality accident situation: Areva's answer (G. Marcellin (Areva NC)); Dosimetry in criticality accident situation: IRSN's expertise (M.A. Chevallier (IRSN)); Cosmic radiation dosimetry on board of aircraft (J.F. Bottollier-Depois (IRSN)); Conclusion of the conference (S. Haan (CEA))

  9. First-principles investigation of hydrogen storage properties on metal-doped low-dimensional materials

    International Nuclear Information System (INIS)

    Full text: The realization of hydrogen storage is a key issue for the advancement of fuel cell power systems in transportation applications. To overcome the technical limits associated with storing hydrogen in its gaseous phase, researchers in materials science have recently focused their attention on solid-phase storage using various materials. The main barrier to increasing the hydrogen uptake in organic nanomaterials is a weak interaction between the hydrogen molecule and the low-dimensional materials; this still remains a challenge, despite the recent surge in such studies. A good strategy is to use 'doping' that will enable optimization of the binding energy in order to enhance hydrogen adsorption. In recent years, tremendous interest has been shown in the hydrogen storage capacity of various metal-doped organic low-dimensional materials because they can contain a wide variety of dopants and chemical compounds. In particular, organic nanomaterials are suitable host materials, and look set to deliver unparalleled performance as the next generation of base materials for storing hydrogen. Inspired by these findings, we have explored the hydrogen storage properties of alkali doped fullerene, BN fullerene [1], BN sheet [2], and calixarene molecule [3]. The structural and electronic characteristics of storage systems, and their hydrogen storage properties are considered within the context of density functional theory, as implemented in the VASP code [4]. We also examined the storage properties by using Gaussian 09 [5] and TOMBO program [6]. Calculations based on DFT show that alkali metal dopant significantly improves the average binding energy of hydrogen molecules. In this presentation, we will show that theoretical calculations which can be used to understand the properties of organic nanomaterials and to design novel low-dimensional structures with desirable functions. These results indicate that the binding energy between the hydrogen molecules and the storage

  10. Synthetic ion transporters that work with anion-π interactions, halogen bonds, and anion-macrodipole interactions.

    Science.gov (United States)

    Vargas Jentzsch, Andreas; Hennig, Andreas; Mareda, Jiri; Matile, Stefan

    2013-12-17

    these elusive interactions in action, we synthesized naphthalenediimide transporters of increasing π-acidity up to an unprecedented quadrupole moment of +39 Buckinghams and characterized these systems in comparison with tandem mass spectrometry and computational simulations. With π-acidic calixarenes and calixpyrroles, we have validated our results on anion-π interactions and initiated our studies of halogen bonds. Halogen bonds originate from the σ-hole that appears on top of electron-deficient iodines, bromines, and chlorines. Halogen-bond donors are ideal for anion transport because they are as strong and at least as directional as hydrogen-bond donors, but also hydrophobic. The discovery of the smallest possible organic anion transporter, trifluoroiodomethane, illustrates the power of halogen-bond donors. This molecule contains a single carbon atom and is a gas with a boiling point of -22 °C. Anion-macrodipole interactions, finally, differ significantly from anion-π interactions and halogen bonds because they are important in nature and cannot be studied with small molecules. We have used anion-transporting peptide/urea nanotubes to examine these interactions in synthetic transport systems. To facilitate the understanding of the described results, we also include an in-depth discussion of the meaning of Hill coefficients. The use of synthetic transport systems to catch less common noncovalent interactions at work is important because it helps to expand the collection of interactions available to create functional systems. Progress in this direction furthers fundamental knowledge and invites many different applications. For illustration, we briefly discuss how this knowledge could apply to the development of new catalysts. PMID:23547885

  11. Impact of Irradiation on Solvent used in SRS Waste Treatment Processes

    International Nuclear Information System (INIS)

    Savannah River Site (SRS) will use a Caustic Side Solvent Extraction (CSSX) process to selectively remove radioactive Cs-137 from the caustic High Level Waste (HLW) salt solutions stored in the large carbon steel waste tanks in the SRS Tank Farm. This HLW resulted from several decades of operations at SRS to produce nuclear materials for the United States Government. The removed Cs-137 will be sent to the Defense Waste Processing Facility (DWPF) where it will be immobilized along with the HLW sludges from the SRS Tank Farm into a borosilicate glass that will be put into permanent disposal. Currently the CSSX process is operating on an interim basis in the Modular Caustic Side Solvent Extraction Unit (MCU) facility. Eventually the process will occur in the full scale Salt Waste Processing Facility (SWPF) currently being built. The organic solvent developed for the process is primarily a mixture of the IsoparR L (a blend of C10-C12 branched alkanes such as dodecane) and an alkyl aryl polyether added as a Modifier (commonly called Cs-7SB) to enhance the solubility of the extractant which is a calixarene-crown ether. The solvent also includes trioctylamine to mitigate the adverse impact of lipophilic agents on the stripping of the cesium into nitric acid. Since the mixture is primarily organic hydrocarbons, it is expected that radiolysis of the mixture with gamma rays and beta particles from the Cs-137 will produce the flammable gas H2 and also eventually degrade the solvent. For example, much research has been performed on the radiolysis of the organic solvent used in the tributylphosphate (TPB) extraction process (Purex process) that has been used at SRS and in many other countries for several decades to separate U and Pu from radioactive U-235 fission products such as Cs-137. The purpose of this study was to investigate the radiolysis of the organic solvent for the CSSX process. Researchers at Savannah River National Laboratory (SRNL) irradiated samples of solvent

  12. Chemistry%化学

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    O612 01050129 具有微孔/大孔双孔道体系沸石材料的合成=Synthesis of Silicate Materials with Micro/Macroporous Bimodal Pore Systems[刊, 中]/王亚军(复旦大学),唐颐…∥高等学校化学学报.&2000, 21(7).&1013~1015 国家自然科学基金(29873011)资助 O612 01050130 一种新型磷酸钛大单晶的溶剂热法合成与结构研究=Studies on Solvothermal Synthesis and Structure of a New Titanium Phosphate Large Single Crystal[刊, 中]/郭阳虹(吉林大学),施展…∥高等学校化学学报.&2000, 21(7).&1010~1012 国家自然科学基金(29571011)资助 O613 01050131 一种氟气源的制备及热分解=Preparation and Thermal Decomposition of a Kind of Fluorine Source[刊, 中]/刘文元(西北核技术研究所),李辉…∥应用化学.&2000, 17(3).&300~303 国家"八六三”计划资助课题 O613 01050132 铒在HBTMPTP-正庚烷/水溶液间的传质动力学=Mass Transfer of Er(Ⅲ) between HBTMPTP Dissolved in n-Heptane and HAc-NaAc[刊, 中]/乐善堂(中科院长春应用化学所),马根祥…∥高等学校化学学报.&2000, 21(6).&832~835 在(30±0.5)℃下,用层流恒界面池研究了铒在HBTMPTP-正庚烷-0.2mol/L(H,Na)Ac萃取体系中的传质动力学.测定了该体系的界面张力,考察了水相酸度、萃取剂浓度、氯离子浓度、温度和比界面对萃取速率的影响.图6参16 国家自然科学基金(29771028,29801004)资助 O613 01050133 岩石中硼的提取分离及同位素组成的测定=Extraction and Separation of Boron in Rock Samples and lts lsotopic Determination by Thermal lonization Mass Spectrometry[刊, 中]/王刚(中科院青海盐湖所),王蕴慧…∥岩矿测试.&2000, 19(3).&169~172 介绍了一种用Na2CO3+K2CO3混合熔剂对岩石样品进行分解,用硼特效树脂和阴、阳混合离子交换树脂相结合进行岩石样品中硼的纯化分离的方法.采用该方法从岩石样品中提取、分离出来的硼能满足硼同位素质谱法测定的需要,不产生硼同位素分馏,硼同位素测定精度大多优于0.05%.表3参7 国家自然科学基金(29775028)资助 O614 01050134 有机/无机纳米杂化材料负载钛催化剂及聚合研究:Ⅰ.乙烯聚合=Study of Titanium Catalysts Supported on he Organic/Inorganic Hybrid and Polymerization Thereby:Ⅰ.Polymerization of Ethylene[刊, 中]/朱宁(中科院长春应用化学所),唐涛…∥应用化学.&2000, 17(3).&233~237 以苯乙烯与马来酸酐无规共聚物为有机组分,以正硅酸乙酯为无机组分,利用sol-gel方法制得纳米杂化材料,以此为载体合成了杂化材料载体钛系催化剂.图3表3参13 国家自然科学基金(29774028)资助 O614 01050135 硫酸锌与L-α-缬氨酸固体配合物的合成与表征=Synthesis and Characterization of Zinc Sulfate Complexes with L-α-Valine[刊, 中]/张晓玉(西北大学),杨旭武…∥应用化学.&2000, 17(3).&243~247 用半微量相平衡方法研究了ZnSO4-Val-H2O体系在25℃时的溶度图及饱和溶液折光率曲线.体系中未形成新化合物.合成了配合物Zn(Val)SO4*H2O、Zn(Val)2*H2O,并进行了表征.图2表3参13 国家自然科学基金(29871023)资助 O614 01050136 微乳液法制备超细包裹型铁粉=Preparation of Ultrafine Fe Particles by Microemulsion Method[刊, 中]/张朝平(贵州大学),邓伟…∥应用化学.&2000, 17(3).&248~251 应用W/O型微乳液法制备了纳米量级包裹型超细铁粉.由XRD、SEM、TEM和IR谱测试表明:它属于表面活性剂包裹型超细微粒.图3参9 国家自然科学基金(19872021)资助 O614 01050137 以12-钨(钼)磷杂多酸为掺杂剂的导电聚N,N-二甲基苯胺的合成与导电性=Synthesis and Conductivity of Conducting Poly N,N-Dimethaniline Doped by 12-Tungsto(Molybdo) Phosphoric Acid Used as Doping Agent[刊, 中]/张贞文(湖北大学),柳士忠…∥湖北大学学报(自然科学版).&2000, 22(3).&270~273 以12-钨(钼)磷杂多酸为掺杂剂,合成了聚N,N-二甲基苯胺.并利用ICP、元素分析、循环伏安、红外光谱及室温固体电导率的测定等手段进行了表征.结果表明,掺杂的PDMAn/PM12的室温导电率约为12-13 S/cm.图3参6 国家自然科学基金(29971010)资助 O614 01050138 Co(phen)2TATP3+与DNA在旋转金盘金环电极上的相互作用研究=Electrochemical Studies on the Interactions of the Complex of Co(phen)2TATP3+ with DNA at Rotating Au-Au Electrode[刊, 中]/李红(中山大学),蒋雄…∥高等学校化学学报.&2000, 21(7).&995~998 在pH=7.2的Tris缓冲溶液中,利用旋转环盘电极法研究了金电极上Co(phen)2TATP3+与DNA的相互作用,并根据扩散控制和电化学控制下得到的各种参数,对它们作用的模式进行了讨论.图3表2参13 国家自然科学基金(29871036)资助 O614 01050139 双金属杂原子分子筛CrCoBEA的合成、波谱及催化性能研究=Studies on the Synthesis, Spectroscopy and Catalytic Properties of CrCoBEA Metallosilicate[刊, 中]/王亚军(南开大学),唐祥海…∥高等学校化学学报.&2000, 21(7).&999~1004 采用水热晶化法首次合成出BEA结构含铬、钴双金属杂原子分子筛CrCoBEA,对晶化时间、晶化温度、成胶配比等合成条件进行了优化研究,测试其物相、波谱性质和催化性能.图6表1参15 国家自然科学基金重点项目(29733070)资助 O614 01050140 Ru(bpy)2+3在MCM-48中的组装及其发光性质=The Assembly of Tris(Bipyridine)Ruthenium(Ⅱ) in MCM-48 and Photoluminescent Properties of Assembly Products[刊, 中]/房铭(吉林大学),张萍…∥高等学校化学学报.&2000, 21(7).&1016~1017 国家自然科学基金(29771013,59795006)资助 O621 01050141 2-烯丙基-1,1-偕二金属环已烷的合成研究=Synthesis of 2-Allyl-1,1-Gemdimetallic Cyclohexane[刊, 中]/宋国强(江苏石油化工学院),王钒…∥合成化学.&2000, 8(3).&216~219 在无水乙醚中1-锂代环己烯和烯丙基溴化镁于无水溴化锌作用下发生金属化克兰荪重排反应,生成2-烯丙基-1,1-偕二金属环己烷.通过对温度、溶剂量和投料顺序等重排反应主要影响因素的考察和优化,可使2-烯丙基-1,1-偕二金属环己烷的收率达到65%.图2表3 国家自然科学基金(2947043)资助 O621 01050142 沙丘芦苇特有一小分子化合物及其对叶绿体的逆境保护效应[刊, 中]/浦铜良(兰州大学),程佑发…∥科学通报.&2000, 45(12).&1308~1313 用柱层析手段从沙漠地区沙丘芦苇叶片中分离得到一种为该生态型所特有的小分子物质,其化学特征与已报道的逆境胁迫诱导累积的溶质均不同,具多氨基芳香族强极性特征.其自然丰度与月平均气温和月极端高温值为指标的生境高温程度呈显著相关性.并主要存在于光合细胞器叶绿体中.该物质对离体叶绿体在高温下电子传递链的功能具有保护作用.图5表2参15 国家自然科学基金(39870062)资助 O621 01050143 亚胺氧自由基与酚类的反应=The Reaction of Iminoxy Radical with Phenols[刊, 中]/胡家欣(南京大学),吉民…∥高等学校化学学报.&2000, 21(7).&1045~1047 研究了亚胺氧自由基与酚类的反应,一步合成了取代苯并C023唑、萘并及喹啉并C023唑类衍生物,同时探讨了反应机理.表2参8 国家自然科学基金(29375052)资助 O621 01050144 新型磺酰胺类含氮手性配体的合成、晶体结构及催化苯乙酮的不对称氢转移反应=Studies on the Synthesis of New Sulfonylamide Ligand, Crystal Structure and Asymmetric Hydrogen Transfer Reaction of Acetophenone[刊, 中]/董春娥(中科院成都有机化学所),张俊龙…∥高等学校化学学报.&2000, 21(7).&1070~1072 国家自然科学基金(29973042)资助 O624 01050145 P+7原子团簇及其特殊配位=P+7 Clusters and Their Specical Coordinations[刊, 中]/陈明旦(厦门大学),罗海彬…∥厦门大学学报(自然科学版).&2000, 39(3).&341~346 在激光产生的磷原子团簇正离子的质谱图中,P+7具有最强的谱峰.使用分子图形软件设计出24种P+7的同分异构体,并进行分子力学、PM3半经验量子化学和ADF密度泛函优化.从各异构体成键能量的比较中可得知,最稳定的P+7构型是在最稳定的P6的双键位置增加1个磷原子所生成的结构.图2表2参23 国家自然科学基金资助 O626 01050146 硫醚双酐聚酰胺酸的合成及其热稳定性=The Synthesis and Thermal Stability of Thioether Dianhydride Poly(Amic Acid)[刊, 中]/王江洪(中科院感光化学所),沈玉全∥高等学校化学学报.&2000, 21(6).&879~883 合成了硫醚二酐和4-硝基-4′-[N,N-二(2-氨乙基)氨基]偶氮苯(二胺单体)及对应的硫醚聚酰胺酸,并对其结构进行表征.目前,这些聚合物在高敏感非线性光学材料方面显示着广泛的应用前景.图3参14 国家自然科学基金(69637010)资助 O626 01050147 具有光致变色和发光性能的有机化合物的合成及其性能研究=Synthesis and Characteristics of Compounds Having Both Photochromic and Fluorescent Character[刊, 中]/庞美丽(南开大学),王永梅…∥高等学校化学学报.&2000, 21(6).&903~907 以吲哚啉螺苯并吡喃与香豆素衍生物为原料.用DCC缩合酯化法在温和条件下合成了8种新的具有光致变色和发光性能的化合物.所得化合物同时具有光致变色和发荧光的双重特性.图2参15 国家自然科学基金(29872015)资助 O626 01050148 1,2,4-三唑并[3,2-d][1,5]-苯并氧氮杂C024化合物的合成=Synthesis of 1,2,4-Triazolo[3,2-d][1,5] Benzoxazepine Compounds[刊, 中]/刘现军(复旦大学),刘毅…∥高等学校化学学报.&2000, 21(7).&1052~1055 苯并二氢吡喃-4-酮的芳腙衍生的偶氮基碳正离子与腈发生1,3-偶极环加成反应,加成产物通过[1,2]-迁移扩环重排反应,形成新颖的三环系杂环化合物1,2,4-三唑并[3,2-d][1,5]-苯并氧氮杂C024化合物.图1表3参9 国家自然科学基金(A29872007)资助 O626 01050149 四(4-N-吡啶基)卟啉衍生物的合成及表征=Synthesis and Characterization of Meso-Tetrakis(4-Pyridyl) Porphyrin Derivatives[刊, 中]/刘淑清(吉林大学),孙浩然…∥应用化学.&2000, 17(3).&260~263 利用吡啶氮烷基化合成了一系列具有空间效应的水溶性和油溶性的四(4-N-吡啶基)卟啉衍生物及其对应的金属钴卟啉.表5参8 国家自然科学基金(29733090,29803003)资助 O627 01050150 η6-苯乙烯二羰基(三苯基膦)铬配合物的合成与聚合=Synthsis and Polymerization of η6-Styrenedicarbonyl (Triphenylphos- phine) Chromium Complexes[刊, 中]/田晓慧(华东理工大学),林嘉平…∥功能高分子学报.&2000, 13(4).&419~422 国家教委留学回国人员科研启动基金资助 O627 01050151 Schiff碱单核及双核配合物拟酶催化性能的研究=Studies on the Biomimetic Catalytic Character of New Schiff Base Mono-and Di-Nuclear Complexes[刊, 中]/陈新斌(湖南大学),朱申杰…∥高等学校化学学报.&2000, 21(7).&1048~1051 国家自然科学基金(29472055)资助 O627 01050152 Cp2TiCl2/BuiMgBr/THF体系还原二芳基二硒醚=Reduction of Diphenyldiselides with Cp2TiCl2/BuiMgBr/THF[刊, 中]/许新华(南开大学),黄宪∥高等学校化学学报.&2000, 21(7).&1073~1074 国家自然科学基金(29672008)资助 O629 01050153 环肽合成方法的研究进展=Progress in the Study on Synthetic Method of Cyclopeptide[刊, 中]/唐艳春(北京大学),田桂玲…∥高等学校化学学报.&2000, 21(7).&1056~1063 介绍了纯环肽与杂环肽合成的方法、策略及其优缺点,列举了一些常用缩合试剂,探讨了反应溶液浓度、线型肽前体化合物的结构及构象等因素对环化反应的影响.参64 国家自然科学基金(29772001)资助 O63 01050154 N-异丙基丙烯酰胺/N-乙烯基吡咯烷酮水凝胶的研究=Synthesis and Characterization of Copolymer Hydrogels of Poly(N-Isopropylacrylamide-co-N-Vinyl-2-Pyrrolidone)[刊, 中]/刘郁杨(西北工业大学),范晓东…∥功能高分子学报.&2000, 13(4).&380~384 陕西省自然科学基金资助 O63 01050155 组织工程细胞支架及其细胞亲和性改进研究进展=Cells Scaffold for Tissue Engineering and Improvement of Cells Affinity between the Cells and Cells Scaffold[刊, 中]/杨健(中科院化学所),贝建中…∥功能高分子学报.&2000, 13(4).&455~460 国家"973计划” O63 01050156 新型的乙烯聚合催化剂=Novel Catalysts for Ethylene Polymerization[刊, 中]/罗祥(中山大学),伍青∥功能高分子学报.&2000, 13(4).&481~486 广东省自然科学基金资助 O631 01050157 衣康酸对聚丙烯腈原丝结构和性能的影响=Effect of Itaconic Acid on the Structure and Properties of PAN Precursor[刊, 中]/张旺玺(山东工业大学)∥高分子学报.&2000, (3).&287~291 控制单体配比,采用丙烯腈与衣康酸自由基溶液共聚,以偶氮二异丁腈为引发剂在溶剂二甲基亚砜中合成了聚丙烯腈原丝纺丝溶液,并纺制了碳纤维前驱体聚丙烯腈原丝.通过元素分析、IR、DSC、13C-NMR等手段,讨论了共聚单体衣康酸对共聚反应及聚丙烯腈原丝结构和性能的影响.图3表3参11 国家自然科学基金(59783002)资助 O631 01050158 Cr(Ⅱ)与过氧化莰烷酮酰体系引发的活性自由基聚合反应研究=Study on "Living” Radical Polymerization Initiated by Aged Chronum (Ⅱ) Acetate and Ketopinyl Peroxide[刊, 中]/李增昌(中国科学技术大学),吴承佩…∥高分子学报.&2000, (3).&330~334 合成了过氧化莰烷酮酰(KPO),用它和Cr(Ac)2组成的氧化还原体系经陈化后,引发甲基丙烯酸甲酯,甲基丙烯酸β-羟乙酯和丙烯酸进行了聚合反应.其中甲基丙烯酸甲酯具有活性聚合特征.并有效引发含羟基单体如甲基丙烯酸β羟乙酯和丙烯酸进行聚合.图2表4参10 国家自然科学基金(29774027)资助 O631 01050159 MgCl2负载(dbm)2Ti(OPh)2催化乙烯聚合=Ethylene Polymerization with MgCl2-Supported(dbm)2Ti(OPh)2[刊, 中]/阎卫东(中科院化学所),洪瀚…∥高分子学报.&2000, (3).&358~360 报道了用MgCl2负载的二苯氧基二(二苯甲酰甲烷)钛铬合物(dbm)2Ti(OPh),以甲基铝氧烷为助催化剂,常压催化乙烯聚合的结果.图1表2参8 国家自然科学基金(29734141)重点资助 O631 01050160 单分散聚苯乙烯乳胶有序膜在二氧化硅多孔材料制备中的模板作用=Template Effects of the Ordered Film Formed from Monodispersed Polystyrene Latex[刊, 中]/杨振忠(中科院化学所),齐凯…∥高分子学报.&2000, (3).&364~367 以单分散聚苯乙烯乳胶室温形成的有序膜为模板,采用快速溶胶凝胶方法,制备了聚苯乙烯/二氧化硅杂化物,高温烧蚀除去有机物得到了二氧化硅有序孔材料,并讨论了聚苯乙烯有序膜的模板作用机理.图5参15 国家自然科学基金(29774038)资助 O631 01050161 新型含环氧端基聚芳醚酮的合成及表征=Synthesis and Characterization of a Novel Epoxy-Terminated Poly(Aryl Ether Ketoe)[刊, 中]/宣英男(大连理工大学),蹇锡高…∥高分子学报.&2000, (4).&407~410 国家"九五”攻关项目 O631 01050162 超支化聚(胺-酯)的分子设计及其制备=Synthesis and Characterization of Hyperbranched Poly(Amine-Ester)[刊, 中]/陆玉(中国科学技术大学),林德…∥高分子学报.&2000, (4).&411~414 国家自然科学基金(59673026)资助 O631 01050163 聚苯基单醚喹C023啉薄膜的性能与物理老化=The Relations between Properties and Physical Aging of Polyphenylquinoxaline Film[刊, 中]/刘万军(中科院化学所),沈静姝…∥高分子学报.&2000,(4).&415~419 国家科委基础性研究重大项目 O631 01050164 端基附壁模型聚合物环形链的构象统计理论=Configurational Statistics of Model Polymer Loop Chains Attached to a Surface[刊, 中]/廖琦(四川大学),吴大诚∥高分子学报.&2000,(4).&420~425 国家自然科学基金(29774016)资助 O631 01050165 拉格朗日-欧拉方法模拟高分子复杂流体平面收缩流动=The Lagrangian-Eulerian Method:Solutions for Planar Contraction Flow[刊, 中]/李险峰(中科院化学所),袁学锋…∥高分子学报.&2000,(4).&432~437 国家自然科学基金(29634030)资助 O631 01050166 气体膜分离用过渡金属有机络合物-聚酰亚胺杂化材料的研究=Study on Transitional Metal Organic Complex-Polyimide Hybrid Material for Gas Separation Membranes[刊, 中]/史德青(石油大学),孔瑛…∥高分子学报.&2000,(4).&457~461 科技部国家重点基础研究发展规划项目 O631 01050167 原子转移自由基聚合制备聚(丙二醇-g-苯乙烯)=Synthesis of Poly(Propylene Glycol-g-Styrene) from Atom Transfer Radical Polymerization[刊, 中]/黄昌国(华东理工大学),万小龙…∥高分子学报.&2000,(4).&467~471 国家自然科学基金(29634010)资助 O631 01050168 聚苯胺嵌入氧化石墨复合物的合成及表征=Synthesis and Characterization of Polyaniline Intercalated Graphite Oxide Composite[刊, 中]/刘平桂(北京航空材料研究院),龚克成∥高分子学报.&2000,(4).&492~495 国家自然科学基金(59836230)资助 O631 01050169 乙交酯/丙交酯共聚物的体内外降解行为及生物相容性研究=Study on the Biocompatibility and Degradation Behavior of Poly(l-Lactide-co-Glycolide) in vitro and in vivo[刊, 中]/蔡晴(中科院化学所),贝建中…∥功能高分子学报.&2000, 13(3).&249~254 国家重点基础研究发展规划(973)资助 O631 01050170 动态下HTDB/TDI体系凝胶化的研究=Study on the Gelation of Hydroxy-Teminated Polybutadiene/Diisocyanate Blends under Dynamic Condition[刊, 中]/邱方正(华东理工大学),陈建定∥功能高分子学报.&2000, 13(3).&289~292 国家教育部博士点基金资助 O631 01050171 含偶氮苯生色团的聚醚的合成与热致液晶性质=Synthesis and Thermotropic Liquid Crystalline Properties of Two Polyethers Containing Azobenzene Groups[刊, 中]/梁旭霞(中山大学),张灵志…∥功能高分子学报.&2000, 13(3).&277~284 广东省自然科学基金资助 O631 01050172 CoSalphen在壳聚糖上的固定化及对DOPA的催化氧化研究=CoSalphen Immobilized onto Chitosan and Its Activate in Catalytic Oxidation of DOPA[刊, 中]/马会宣(陕西师范大学),胡道道…∥功能高分子学报.&2000, 13(3).&301~305 陕西省自然科学基金资助 O631 01050173 环氧基活化凝胶的开环反应=Ring-Opening Reaction on Epoxy-Activated Resin[刊, 中]/查娟(生物反应器工程国家重点实验室),刘坐镇…∥功能高分子学报.&2000, 13(3).&321~324 由自制的乙酸乙烯酯-甲基丙烯酸缩水甘油酯-甲基丙烯酸烯丙酯大孔共聚物与氨水反应,实现了环氧基的开环反应.考查了不同的氨水浓度、反应温度和时间对胺化转化率的影响,并测定了形成的伯胺基的pKa值为6.9.图4表1参12 国家自然科学基金(29706002)资助 O631 01050174 纳米自组装聚电解质超薄多层膜=Polyelectrolyte Ultrathin Multilayer Films by Nano-Self-Assembly Process[刊, 中]/孙启龙(华南理工大学),王朝阳∥功能高分子学报.&2000, 13(3).&332~336 国家杰出青年科学基金(29725411)与国家自然科学基金(29804003)资助 O631 01050175 十二烷基硫酸钠减慢二苯胺-4-重氮盐及重氮树脂在水溶液中热分解反应的机理=The Mechanism of Thermal Decomposition of DDS and DR in Aqueous Solution Delayed by SDS[刊, 中]/杨伯C025(北京大学),曹维孝∥高等学校化学学报.&2000, 21(6).&969~975 国家自然科学基金(59633110及29774001)资助 O631 01050176 芘标记磺酸基聚电解质在水与DMSO中的荧光光谱=Fluorescence Spectra of Pyrene Labeled Polyelectrolytes with Sulfonate Groups in Water and DMSO[刊, 中]/高峰(华南理工大学),严宇…∥高等学校化学学报.&2000, 21(6).&976~979 国家自然科学基金(29804003)与国家杰出青年科学基金(29725411)资助 O631 01050177 尼龙1012的Brill转变=Brill Transition of Nylon 1012[刊, 中]/李勇进(上海交通大学),颜德岳…∥高等学校化学学报.&2000, 21(6).&983~984 国家自然科学基金(29974017)资助 O631 01050178 热致液晶含氯侧基聚芳醚酮的单晶状条带织构=The Single Crystal-Like Banded Textures in the Films of a Thermotropic Liquid Crystalline Poly(Aryl Ether Ketone) Containing a Lateral Chloro Group[刊, 中]/富露祥(中科院长春应用化学所),张善举…∥高等学校化学学报.&2000, 21(6).&988~990 国家自然科学基金(29974032)资助 O631 01050179 具有RAFT链转移过程的活性自由基聚合的Monte Carlo模拟=Monte Carlo Simulation on Living Radical Polymerization with RAFT Process[刊, 中]/李莉(复旦大学),何军坡…∥高等学校化学学报.&2000, 21(7).&1146~1148 国家自然科学基金资助 O631 01050180 C60-苯乙烯-顺丁烯二酸酐的三元自由基共聚=Free Radical Ternary Copolymerization of C60 with Styrene and Maleic Anhydride[刊, 中]/官文超(华中理工大学),雷洪…∥高等学校化学学报.&2000, 21(7).&1149~1150 国家自然科学基金(29674010)资助 O631 01050181 聚(苯乙烯-b-2-甲基-2-C023唑啉)嵌段共聚物的合成=Studies on Synthesis of P(S-b-Me-OXZ) Block Copolymers[刊, 中]/刘燕飞(华东理工大学),万小龙…∥高等学校化学学报.&2000, 21(7).&1157~1159 国家自然科学重点基金(29634010-2)资助 O631 01050182 乙丙共聚物接枝马来酸酐反应机理的模拟研究=Investigation of Reaction Mechanism of Maleic Anhydride Grafted onto Ethylene-Propylene Copolymer[刊, 中]/黄宏亮(中科院长春应用化学所),姚占海…∥应用化学.&2000, 17(3).&256~259 国家自然科学基金(59873022)资助 O631 01050183 稀土催化丁二烯-异戊二烯共聚合过程中的原位环化反应=In situ Cyclization in the Course of Butadiene Isoprene Copolymerization with Nd-Based Catalyst[刊, 中]/董为民(中科院长春应用化学所),逄束芬…∥应用化学.&2000, 17(3).&272~275 国家自然科学基金(29574179)资助 O631 01050184 计算机模式识别在颜料表面改性中的应用=Study on the Application of Pattern Recognition with a Computer in Surface Modification of Pigment[刊, 中]/严乐美(天津大学),杨桂琴…∥天津大学学报.&2000, 33(3).&344~347 国家自然科学基金(29376254)资助 O631 01050185 共混物中聚氯乙烯凝胶化度测试=Studies on Gelling Value of Polyvingyl Chloride in the Blend[刊, 中]/何本桥(湖北大学),张玉红…∥湖北大学学报(自然科学版).&2000, 22(4).&367~370 湖北省自然科学基金资助 O631 01050186 二氧化硅模板技术制备三维有序聚苯乙烯孔材料[刊, 中]/容建华(中科院化学所),杨振忠…∥科学通报.&2000, 45(15).&1627~1630 以单分散二氧化硅颗粒形成的有序结构为模板,制备了聚苯乙烯孔材料.通过扫描电子显微镜观察了模板、复合物及有序多孔聚苯乙烯的形态.结果表明,所合成的多孔材料中,孔大小均匀,空间排布高度有序,且结构与模板中二氧化硅小球自组装方式完全相同.图6参8 国家自然科学基金(20023003)资助 O631 01050187 光导性偶氮聚合物材料的设计[刊, 中]/周雪琴(浙江大学),陈红征…∥自然科学进展.&2000, 10(6).&543~548 以电荷转移理论为指导,对偶氮聚合物材料结构进行设计,获得了两类光导性偶氮聚合物材料,并对其结构和光导性进行了分析与讨论.图4表1参16 国家自然科学基金(59333071,69890230)资助 O631 01050188 聚合物复合材料中填料的摩擦学作用=Tribological Actions of Filiers in Polymer Composites[刊, 中]/薛群基(中科院兰州化学物理所),阎逢元∥中国科学基金.&2000, 14(4).&211~215 综述了就填料对聚合物复合材料的结构和摩擦学行为的影响,并对目前研究过程中所存在的问题进行了简要分析.图3参29 国家自然科学基金资助 O633 01050189 双马来酰亚胺树脂链结构对熔点和反应活性的影响=The Effect of Chain Structure of Bismaleimide Resins on Melting Point and Reactivity of Reaction[刊, 中]/刘润山(湖北省化学研究所),赵三平…∥功能高分子学报.&2000, 13(4).&487~493 湖北省自然科学基金资助 O636 01050190 高分子固体电解质材料研究进展=Advances in Material of Solid Polymer Electrolytes[刊, 中]/赵地顺(河北科技大学),孙凤霞…∥功能高分子学报.&2000, 13(4).&469~475 河北省自然科学基金资助 O64 01050191 Ru(bpy)2(NCS)2染料敏化CdS/Zn2+-TiO2复合半导体纳米多孔膜的光电化学=Photoelectrochemistry of CdS/Zn2+-TiO2 Composite Semiconductor Nanoporous Films Sensitized by Ru-(bpy)2(NCS)2 Dye[刊, 中]/张莉(北京大学),王艳芹…∥高等学校化学学报.&2000, 21(7).&1075~1079 国家自然科学基金(29773003)资助 O641 01050192 富勒烯笼结构的平面展示法[刊, 中]/叶大年(中科院地质与地球物理所),艾德生…∥科学通报.&2000, 45(16).&1781~1785 采用船式F5和F6与海燕式F5和F6分别表示富勒烯笼几何结构的两种平面图.这些平面图最大的优点是:(1)不破坏富勒烯笼的空间对称性;(2)可以非常清楚地展示出结构中F5和F6的配位形式.这为富勒烯笼的结构几何研究打下了基础.图3参17 国家自然科学基金(49872019)资助 O641 01050193 布朗扩散系数对胶体分形粒子簇扩散控制聚集动力学影响的Monte Carlo模拟=Monte Carlo Simulation to the Effect of Cluster Brownian Diffusion Coefficient on the Colloidal Fractal Cluster Aggregation Kinetics[刊, 中]/王惠(南开大学),王贵昌…∥高等学校化学学报.&2000, 21(6).&922~925 使用表征粒子簇结构的几何形状因子,通过对扩散控制聚集过程的模拟,从微观或介观层次研究了粒子簇结构对粒子簇增长速率和速率常数的影响规律,并与实验结果进行了对比分析.图4表1参15 国家自然科学基金(29573109)资助 O641 01050194 一些富勒烯C60双加成物稳定性的理论研究=Theoretical Studies on the Stabilities of Some C60 Bis-Adducts[刊, 中]/陈中方(南开大学),王贵昌…∥高等学校化学学报.&2000, 21(7).&1127~1129 国家自然科学基金(29773022)资助 O641 01050195 M(bpy)+32(M=Fe,Ru,Os)电子结构与相关性质=Electronic Structure and Related Chemical Properties of Complexes(M=Fe,Ru,Os)[刊, 中]/郑康成(中山大学),匡代彬…∥物理化学学报.&2000, 16(7).&608~612 报道了对配合物(M=Fe,Ru,Os)的量子化学密度泛函法研究的结果,探讨的电子结构特征及相关性质,特别是中心原子对配合物的配位键长、光谱性质、电荷布居及化学稳定性等的影响规律.图2表6参14 国家自然科学基金资助 O642 01050196 纳米HZSM-5分子筛的热稳定性=Thermostability of Nanosized HZSM-5 Zeolite[刊, 英]/张维萍(中科院大连化物所),包信和∥催化学报.&2000, 21(3).&195~196 科技部攀登计划项目 O642 01050197 微量热法研究硒对大肠杆菌生长代谢的作用=Microcalorimetric Study of the Action of Seleniumcontaining Complexes on Growth Metabolism of Escherichia coli[刊, 中]/李曦(武汉大学),刘义…∥物理化学学报.&2000, 16(6).&568~572 采用微量热法测定了Na2SeO3、吗啉、硒代吗啉和N,N'-亚基双硒代吗啉对大肠杆菌作用的热功率输出曲线,根据热功率输出曲线求算在这些药物作用下,大肠杆菌生长代谢的速率常数,并对它们的作用特征进行了比较.图2表1参7 国家自然科学基金资助 O642 01050198 反相气相色谱法测定溶剂在PBMA中的无限稀释活度系数=Measurement of Infinite Diluted Activity Coefficient of Solvent in PBMA by Inverse Gas Chromatography Method[刊, 中]/冯媛媛(华东理工大学),叶汝强…∥华东理工大学学报.&2000, 26(3).&305~308 用反相气相色谱方法测定了16种溶剂在聚甲基丙烯酸丁酯(PBMA)中343~433K范围内的无限稀释活度系数,并用周浩等的高分子溶液分子热力学模型对实验结果进行了关联,结果令人满意.图8表2参15 国家自然科学基金(29976011)资助 O643 01050199 海泡石对非晶态NiB合金催化剂的改性研究=Studies on the Modification of Sepiolite for Amorphous NiB Alloy Catalyst[刊, 中]/石秋杰(南昌大学),陈昭萍…∥物理化学学报.&2000, 16(6).&501~506 以常压气相苯加氢为探针反应,考察了酸改性前后海泡石的加入对非晶态NiB合金催化剂的加氢及抗硫性能的影响,用TPR、TPD表征了催化剂的表面性质,测定了酸改性前后海泡石的比表面及孔径分布,并与活性进行了关联.图3表3参12 国家自然科学基金资助 O643 01050200 F+NCO反应的机理和动力学=Mechanism and Kinetics of the F+NCO Reaction[刊, 中]/侯华(山东大学),王宝山…∥物理化学学报.&2000, 16(6).&517~521 高等学校博士学科点专项科研基金资助 O643 01050201 激光溅射下原子团簇生长的非平衡力学(Ⅱ)=Non-Equilibrium Kinetics of Clusters Growth under Laser Ablation(Ⅱ)[刊, 中]/曹玉群(厦门大学),黄荣彬…∥物理化学学报.&2000, 16(7).&621~626 国家自然科学基金(29890210,29773040)资助 O643 01050202 双(2,4-二甲基戊二烯基)氯化钆的合成及晶体结构=Synthesis and Structure of Bis(2,4-Dimethylpentadienyl)Gadolinium Chloride[刊, 中]/王建辉(吉林大学),母瀛…∥高等学校化学学报.&2000, 21(6).&829~831 国家自然科学基金(29672013,29754143)资助 O643 01050203 温控相转移催化&&水/有机两相催化新进展=Thermoregulated Phase-Transfer Catalysis&&Recent Advances in Water/Organic Biphasic Catalysis[刊, 中]/金子林(大连理工大学),梅建庭…∥高等学校化学学报.&2000, 21(6).&941~946 综述了"温控相转移催化”的原理,温控膦配体的设计、合成及其在水溶性极小的底物高碳烯烃的水/有机两相氢甲酰化反应中的应用效果.图4表5参35 国家自然科学基金(29792074)资助 O643 01050204 Cr-HMS合成、表征及其在催化氧化反应中的应用=Synthesis, Characterization of Cr-HMS and the Application in Catalytic Oxidation[刊, 中]/乐洪咏(复旦大学),华伟明…∥高等学校化学学报.&2000, 21(7).&1101~1104 合成了一系列不同Cr含量的Cr-HMS介孔分子筛,并对其物化性质进行了表征.结果表明,Cr的引入降低了介孔分子筛骨架结构的规整度和孔径的均一程度.Cr-HMS对苯羟基化和环己烷氧化反应均表现出良好的催化活性.并且随Cr含量的增加,催化活性呈火山型分布.图3表3参14 国家自然科学基金(29873011)资助 O643 01050205 新型甲烷无氧芳构化催化剂MoO3/MCM-49=A Novel Catalyst of MoO3/MCM-49 over Nonoxidative Aromatization of CH4[刊, 中]/许宁(吉林大学),阚秋斌…∥高等学校化学学报.&2000, 21(7).&1113~1114 国家自然科学基金(29973011)资助 O643 01050206 以TiCl4为钛源合成钛硅分子筛=Synthesis of Titanosilicalite Using Titanium Tetrachloride as Titanium Source[刊, 英]/张义华(大连理工大学),王祥生∥催化学报.&2000, 21(3).&197~198 以四丙基溴化铵为模板剂,以四氯化钛为钛源,研究了合成小晶粒钛硅分子筛(TS-1)的合成路线.合成的TS-1样品在丙烯环氧化反应中显示有较高的活性(96%)和选择性(95%),H2O2利用率高于95%.图3表1参8 国家自然科学基金(29792071)资助 O643 01050207 稀土氧化物在Fe1-xO基氨合成催化剂中的作用规律=Regular Effect of Rare Earth Oxide on Fe1-xO Catalyst for Ammonia Synthesis[刊, 中]/季德春(浙江工业大学),李小年∥催化学报.&2000, 21(3).&199~203 考察了稀土氧化物对Fe1-xO基催化剂性能的影响.结果表明,稀土氧化物与Fe1-xO作用生成一种复合氧化物REFeO3,从而促进了催化剂的还原,这种促进作用随稀土离子半径不同呈现规律性变化.图1表6参14 国家自然科学基金(29706011)资助 O643 01050208 光电催化降解磺基水杨酸的研究=Study of Photoelectrocatalytic Degradation of Sulfosalicylic Acid[刊, 中]/刘鸿(中科院大连化学物理所),冷文华∥催化学报, 21(3).&209~212 建立了以TiO2/Ni为工作电极、泡沫镍为对电极、饱和甘汞电极为参比电极的光电催化反应体系,研究了在磺基水杨酸(SSal)的光电催化降解过程中,外加电压和溶液pH值对降解速率的影响.图5表1参18 国家自然科学基金(29877024)资助 O643 01050209 多孔TiO2薄膜的表面微结构对甲基橙光催化脱色的影响=Effect of Surface Microstructure of Porous TiO2 Thin Films on Photocatalytic Decolorization of Methyl Orange[刊, 中]/余家国(武汉工业大学),赵修建∥催化学报.&2000, 21(3).&213~216 湖北省自然科学基金资助 O643 01050210 γ-Mo2N催化剂上的乙炔选择加氢=Selective Hydrogenation of Ethyne on γ-Mo2N[刊, 中]/郝志显(中科院大连化学物理所),魏昭彬∥催化学报.&2000, 21(3).&217~220 对γ-Mo2N催化剂上乙炔加氢反应进行了研究.在150℃的反应温度下,乙炔转化率为95%,乙烯选择性达80%,乙烷选择性为4%,丁烯选择性为10%.反应温度和空速对产物的选择性没有明显的影响.图4参17 国家自然科学基金(29625305)资助 O643 01050211 WO3/ZrO2固体强酸催化剂上异丁烷/丁烯的烷基化反应:Ⅱ.过渡金属的助催化作用=Study on Alkylation of Isobutane with Butene over WO3/ZrO2 Strong Solid Acid:Ⅱ. Promotions Effect of Transition Metal[刊, 中]/孙闻东(中科院长春应用化学所),吴越∥催化学报.&2000, 21(3).&229~233 制备了一系列用过渡金属活化的WO3/ZrO2固体强酸催化剂,并对其晶型结构、表面状态和酸量进行了表征.图7表2参22 国家自然科学基金(29792076)资助 O212 01050212 超细镍基催化剂上CH4-CO2重整反应的性能:Ⅰ.制备方法对催化剂结构和还原性能的影响=CH4 Reforming with CO2 over Superfine Ni-Based Catalysts:Ⅰ. Effects of Preparation Methods on Structure and TPR of Catalysts[刊, 中]/许峥(清华大学),张鎏∥催化学报.&2000, 21(3).&234~238 国家博士点基金资助 O643 01050213 SO2对Co3O4/Al2O3选择性催化氧化NO的影响=Effect of SO2 on Catalytic Oxidation of NO over Co3O4/Al2O3[刊, 中]/赵秀阁(华东理工大学),肖文德∥催化学报.&2000, 21(3).&239~242 采用流动态原位IR,TPD及XPS技术研究了NO及SO2在Co3O4/Al2O3金属氧化物催化剂表面上的吸附及脱附行为,并与该催化剂上模拟烟道气中NO的选择性催化氧化活性相关联,考察了SO2对该反应过程的影响及作用机理.图5参13 国家自然科学基金(29633030)资助 O643 01050214 Lewis酸对杂多酸催化异丁烷/丁烯烷基化反应的作用=Effect of Lewis Acid on Alkylation of Isobutane with Butene[刊, 中]/赵振波(中科院长春应用化学所),吴越∥催化学报.&2000, 21(3).&243~246 考察了SbCl5对杂多酸(HPA)催化异丁烷/丁烯烷基化反应的修饰作用,用Hammett指示剂测定了SbCl5/HPA催化剂的酸强度.结果表明,经SbCl5修饰的HPA的酸强度有所提高,SbCl5的加入量、反应温度及反应时间对烷基化油收率及产物分布均有不同的影响.图5表2参15 国家自然科学基金(29792076)资助 O643 01050215 微波固相法制备的ZnCl2/Y在α-蒎烯环氧化物重排反应中的催化性能=Catalytic Performance of ZnCl2/Y Catalyst Prepared by Solid-State Microwave Irradiation for Rearrangement Reaction of α-Pinene Oxide[刊, 中]/尹笃林(湖南师范大学),银董红∥催化学报.&2000, 21(3).&251~254 国家自然科学基金(29572042,29972011)资助 O643 01050216 Co-Mo/HZSM-5甲烷无氧芳构化催化剂上的积炭=Characterization of Coke on Co-Mo/HZSM-5 Catalyst for Methane Dehydro-Aromatization in the Absence of Oxygen[刊, 中]/田丙伦(中科院大连化学物理所),徐奕德∥催化学报.&2000, 21(3).&255~258 国家重点基础研究发展规划项目 O643 01050217 热处理改性的活性炭纤维的脱硫活性=Desulfurization Activity of Activated Carbon Fiber Modified by Heat Treatment[刊, 中]/李开喜(中科院山西煤炭化学所),凌立成∥催化学报.&2000, 21(3).&264~268 考察了在O2和水蒸气存在下高温热处理对活性炭纤维(ACF)催化转化SO2为H2SO4的活性的影响,关联了ACF表面含氧官能团的种类及数量与其脱硫活性之间的关系.图4表2参20 国家自然科学基金(29633030)资助 O643 01050218 制备方法对锶改性氧化铝的高温热稳定性的影响=The Influence of Preparation Methods on the Thermal Stability of Alumina Modified by Strontium[刊, 中]/刘勇(复旦大学),陈晓银∥催化学报.&2000, 21(3).&273~275 福特-中国研究与发展基金资助 O643 01050219 NO在氧化铝负载的Pd催化剂上吸附的TPD-MS研究=TPD-MS Study of NO Adsorption on Alumina Supported Pd Catalysts[刊, 中]/刘振林(中国科技大学),伏义路∥催化学报.&2000, 21(3).&279~282 福特-中国研究与发基金资助项目 O643 01050220 不同焙烧气氛对氟化镁表面碱性的影响=The Effect of Different Calcination Atmosphere on the Surface Basicity of Magnesium Oxide[刊, 中]/孟明(中国科技大学),林培琰∥催化学报.&2000, 21(3).&286~288 在不同气氛中600℃下焙烧Mg(OH)2制得了MgO样品.结果表明,Mg(OH)2经焙烧后分解为MgO.样品的比表面积受焙烧气氛的影响,真空中制备的样品比表面积最大,而空气中制备的样品比表面积最小.真空中制备的样品具有最多的碱位和最强的碱性.图3表2参8 国家自然科学基金(29973037)资助 O643 01050221 Ni改性Cu/Mn/ZrO2催化剂上合成低碳混合醇的研究=Synthesis of Mixed Higher Alcohols by CO Hydrogenation over Ni-Modified Cu/Mn/ZrO2 Catalyst[刊, 中]/陈小平(中科院山西煤炭化学所),吴贵升∥催化学报.&2000, 21(4).&301~304 国家自然科学基金(29873064)资助 O643 01050222 超细镍基催化剂上CH4-CO2重整反应的性能:Ⅱ.制备方法对催化和抗积碳性能的影响=CH4 Reforming with CO2 over Superfine Ni-Based Catalysts:Ⅱ.Effects of Preparation Methods on Reactivity and Carbon Deposition over Catalysts[刊, 中]/许峥(清华大学),张鎏∥催化学报.&2000, 21(4).&309~313 国家博士点基金资助 O643 01050223 合成甲基叔丁基醚的分子筛催化剂研究=A Study of Zeolite Catalysts for Synthesis of Methyl tert-Butyl Ether[刊, 中]/李永红(天津大学),王莅∥催化学报.&2000, 21(4).&323~326 中国石油化工集团公司资助 O643 01050224 二苯并噻吩在CoMoNx催化剂上的加氢脱硫=Hydrodesulfurization of Dibenzothiophene over Cobalt-Promoted Molybdenum Nitride Catalysts[刊, 中]/柳云骐(石油大学),刘晨光∥催化学报.&2000, 21(4).&337~340 中国石油天然气集团公司资助 O643 01050225 锆助剂含量对钴基费-托合成催化剂的影响=Effect of ZrO2 Loadings on Catalytic Performance of Co/SiO2 for F-T Synthesis[刊, 中]/陈建刚(中科院山西煤炭化学所),相宏伟∥催化学报.&2000, 21(4).&359~362 国家重点基础研究发展规划项目 O643 01050226 一种天然气直接转化制乙烯的新过程=A Novel Process for Direct Conversion of Natural Gas to Ethylene[刊, 英]/朱爱民(中科院大连化物所),田志坚∥催化学报.&2000, 21(4).&395~396 国家科技部资助项目 O643 01050227 N,N-二甲基胺乙基膦酸-磷酸氢锆为载体的新型固体碱研究=Study on Solid Base Supported on Zirconium Dimethyl Aminoethylphosphonate-Phosphate[刊, 中]/龚成斌(中科院大连化学物理所),曾仁权…∥应用化学.&2000, 17(3).&264~267 国家自然科学基金资助 O643 01050228 丙烷在钒-磷混合氧化物催化剂上晶格氧氧化及其循环流化床工艺=Oxidation of Propane over Vanadium-Phosphorus Oxides Catalyst by Lattice Oxygen and Its Circulating Fluidized Bed Process[刊, 中]/王鉴(浙江大学),赵如松…∥应用化学.&2000, 17(3).&313~315 用脉冲色谱研究了丙烷在钒-磷混合氧化物催化剂上的选择氧化反应,并结合TPD和XRD表征结果,证明丙烷是与催化剂的晶格氧反应生成丙烯酸和乙酸.图2参5 国家自然科学基金(29676007)资助 O643 01050229 用以分解氟里昂-12的新型催化剂WO3/Al2O3=A Novel Catalyst WO3/Al2O3 for Decomposition of CFC-12[刊, 中]/马臻(复旦大学),华伟明…∥应用化学.&2000, 17(3).&319~321 国家科委攀登计划资助 O643 01050230 LaFeO3的光催化性=Photocatalytic Activity of LaFeO3[刊, 中]/白树林(天津大学),付希贤…∥应用化学.&2000, 17(3).&343~345 采用柠檬酸法和微乳液法制备纳米晶LaFeO3.结果表明,微乳液法较柠檬酸法制备的LaFeO3粒径小,表面积大,使LaFeO3吸附性增加,因此表现出较强的光催化活性.图2表1 国家自然科学基金(59772019)资助 O643 01050231 NiO/SiO2催化剂上CO氧化的反应机理研究=Mechanism of CO Oxidation on NiO/SiO2 Catalyst[刊, 中]/王远洋(宁夏大学),高荫本…∥宁夏大学学报(自然科学版).&2000, 21(2).&147~149 NiO/SiO2是优良的非贵金属型CO氧化催化剂,EXAFS和TPR表征表明其活性中心为NiO.在此基础上的Monte Carlo模拟表明,在NiO/SiO2上CO氧化遵循L-H机理.图5参11 国家自然科学基金(29803009)资助 O643 01050232 烯基取代的茂钛族络合物合成及应用于烯烃催化聚合的进展=Recent Advances in the Synthesis of Alkenyl Substituted Metallocene Complexes(Ti,Zr,Hf) and the Application of Its to α-Olefins Polymerization[刊, 中]/钱贤苗(华东理工大学),许胜…∥功能高分子学报.&2000, 13(3).&358~366 综述了含烯基取代基的茂钛族络合物的合成,取代基上双键的化学反应,以及在α-烯烃催化聚合上的最新进展.表2参45 国家自然科学基金(29871010)资助 O643 01050233 氧化态Co/γ-Al2O3催化剂的结构与反应性能研究:Ⅱ.钴物种微观结构的XAFS表征=Studies on the Structures and Catalytic Properties of Oxidized Co/γ-Al2O3 Catalysts:Ⅱ.XAFS Characterizations of the Micro-Structures of Co Species[刊, 中]/孟明(中国科学技术大学),林培琰…∥分子催化.&2000, 14(3).&161~165 采用X-射线吸收近边结构与扩展X-射线吸收精细结构技术,对用不同原料盐和不同焙烧温度制得的Co/γ-Al2O3催化剂中钴的微观结构进行了详细的表征.图5表1参8 国家自然科学基金(29973037)资助 O643 01050234 CuCl/γ-Al2O3上NO脱除过程研究=Reaction Mechanism of NO Conversion over CuCl/γ-Al2O3[刊, 中]/朱月香(北京大学),尉继英…∥分子催化.&2000, 14(3).&166~170 设计了一系列的对比实验,利用XRD、XPS、TPR、EXAFS等技术,系统研究了CuCl/γ-Al2O3上的NO脱除反应过程.图4表1参8 国家自然科学基金(29733080)资助 O643 01050235 以Au(PPh3)(NO3)为前体的Au/NiO催化剂的制备及其对CO的催化氧化=Preparation and Catalytic Performance of Au/NiO Catalyst Derived from Au(PPh3)(NO3) for CO Oxidation[刊, 中]/邹旭华(烟台大学),齐世学…∥分子催化.&2000, 14(3).&171~174 采用有机金属配合物固载法,将金的有机配合物Au(PPh3)(NO3)沉积于刚制备出的Ni(OH)2沉淀上.结果表明,以K2CO3作为制备Ni(OH)2的沉淀剂,金担载量为3%(质量分数)在焙烧温度为300℃的条件下,制备出的负载型金催化剂Au/NiO对CO的低温氧化有很高的催化活性.图2表3参15 国家自然科学基金(29873041)资助 O643 01050236 CexZr1-xO2复合氧化物负载PdO催化剂的CO和CH4氧化性能研究=CO and Methane Oxidation over CexZr1-xO2 Mixed Oxide Supported PdO Catalysts[刊, 中]/马磊(浙江大学),韩立峰…∥分子催化.&2000, 14(3).&175~178 浙江省自然科学基金资助 O643 01050237 溶胶-凝胶法镍基催化剂的研究&&Ti/Si原子比对NiO-TiO2-SiO2结构和苯加氢性能的影响=Study of the Nickel Catalysts Prepared by Sol-Gel Method&&The Effects of Si/Ti Atomic Ratios on the Structure and Catalytic Performance for Benzene Hydrogenation of NiO/TiO2-SiO2[刊, 中]/朱毅青(江苏石油化工学院),林西平…∥分子催化.&2000, 14(3).&184~190 中石化集团公司资助课题 O643 01050238 (NH4)15[La(PMo9V2O39)2]*6H2O杂多配合物对苯酚羟化的催化作用=Catalytic Activity of (NH4)15[La(PMo9V2O39)2]*6H2O Heteropoly Complex in Phenol Hydroxylation with Hydrogen Peroxide[刊, 中]/林深(福建师范大学),郑瑛…∥分子催化.&2000, 14(3).&191~194 福建省科委资助项目 O643 01050239 Co改性Mo/HZSM-5催化剂上甲烷无氧芳构化反应研究=Methane Dehydro-Aromatization over Cobalt Modified Mo/HZSM-5 Catalysts in the Absence of Oxygen[刊, 中]/田丙伦(中科院大连化学物理所),刘红梅…∥分子催化.&2000, 14(3).&200~204 国家重点基础研究发展规划项目 O643 01050240 甲醇催化氧化重整反应制氢的研究=Hydrogen Production by Catalytic Oxidation and Reforming of Methanol[刊, 中]/陈兵(华南理工大学),董新法…∥分子催化.&2000, 14(3).&205~208 广东省高教厅自然科学基金资助 O643 01050241 TiO2催化Cr(Ⅵ)-氯代苯酚共存体系中Cr(Ⅵ)的光致还原=Photo-Induced Cr(Ⅵ) Reduction in Cr(Ⅵ)-4CP Coexist Pollution System in the Presence of TiO2 Photocatalyst[刊, 中]/付宏祥(中科院兰州化学物理所),吕功煊…∥分子催化.&2000, 14(3).&214~218 中科院重大项目资助 O643 01050242 三磺化三苯基膦(TPPTS)制备方法的改进=Improvement of Synthesis Method of TPPTS[刊, 中]/张敬畅(北京化工大学),曹维良…∥分子催化.&2000, 14(3).&223~226 国家"九五”科技攻关项目 O644 01050243 预处理对TiO2表面超亲水性的影响=Effect of Pretreatment on Superhydrophilicity of TiO2 Films[刊, 中]/管自生(中科院化学所),马颖∥感光科学与光化学.&2000, 18(3).&204~207 在高温度环境下,应用紫外光辐射对溶胶-凝胶TiO2薄膜预处理,经过预处理的薄膜烧结后具有快速光致高度亲水特性和良好的光催化活性.超亲水的薄膜能够吸附大量的酸性品红,在光照下薄膜将吸附的酸性品红逐渐降解掉.图3参6 国家自然科学基金(59932040)重点资助 O644 01050244 荧光探针在测定N-异丙基丙烯酰胺共聚物最低临界溶液温度(LCST)时的扩散过程=The Diffusion Process of Fluorescence Probe in Measurement of LCST of Poly(N-Isopropylacrylamide-co-Acrylamide) Aqueous Solution[刊, 中]/李俊(中科院感光化学所),史向阳∥感光科学与光化学.&2000, 18(3).&208~213 合成了多种不同配比的N-异丙基丙烯酰胺(NIPAM)与丙烯酰胺(AM)的共聚物.研究了共聚物溶液在温度变化过程中发生的线团-胶粒转变,及荧光探针分子扩散进入疏水胶粒的动力学过程.图3表2参9 国家自然科学基金(29733100)资助 O644 01050245 蒽醌冠醚铕离子络合物分子内能量转移=Intramolecular Energy Transfer in Anthraquione Crown Ether-Eu3+ Complex[刊, 中]/江华(中科院感光化学所),许慧君∥感光科学与光化学.&2000, 18(3).&223~228 研究结果表明,选择性激发铕离子络合物中的蒽醌冠醚能发生分子内能量转移,观察到铕离子的发光.荧光衰减测试表明,由于冠醚的包络作用使得铕离子络合物的荧光寿命较未络合铕离子的寿命有所延长.图5表1参10 国家自然科学基金(29733100)资助 O644 01050246 有机染料光褪色机理及主要原因=The Mechanism and Main Reasons of Photofading of Organic Dyes[刊, 中]/于新瑞(大连理工大学),张淑芬∥感光科学与光化学.&2000, 18(3).&243~253 综述了有机染料光褪色机理的主要研究方法以及现有研究结论.对光氧化和光还原过程、影响因素、典型反应步聚、研究手段进行了系统的阐述,同时也对通过染料分子结构设计合成、通过添加剂的使用提高染料光牢度的方法进行了介绍.图4表3参29 国家自然科学基金重点基金(29836150)资助 O644 01050247 荧光分子开关的研究进展=The Progress of the Research on Fluorescent Molecular Switches[刊, 中]/甘家安(华东理工大学),陈孔常∥感光科学与光化学.&2000, 18(3).&254~262 根据开关动作完成的方式对近年来研究的各类荧光分子开关进行了简要的归类总结,并介绍了一些具有特殊功能的荧光分子开关器件.图8参33 国家自然科学基金(29836150)资助 O644 01050248 半花菁衍生物LB膜的光致荧光特性研究=Photoluminescence Characteristics of Hemicyanine Derivatives in Langmuir Blodgett Multilayers[刊, 中]/王文军(复旦大学),陆兴泽…∥物理化学学报.&2000, 16(6).&496~500 通过改变半花菁的亲水基团与硫水基团而得到了四种半花菁衍生物,利用稳态和时间分辨荧光研究了不同亲水基团与疏水基团对半花菁衍生物光学特性的影响.图1表3参7 国家自然科学基金重点基金(19834030)资助 O644 01050249 N-萘甲基多乙撑多胺类荧光化学敏感器=Fluorescence Chemical Sensor of Naphthylmethyl Polyethylenepolyamine[刊, 中]/梅明华(中科院感光化学所),吴世康∥物理化学学报.&2000, 16(6).&559~562 合成了一类带有萘甲基的多乙撑多胺化合物,对其在不同溶剂中作为FCS检测锌离子时的荧光光谱变化进行了研究.结果表明,两种不同锌盐化合物与配体相互作用时,其所带阴离子对络合物的组成和方式有很大的影响.图2表1参6 国家自然科学基金(29733100)资助 O644 01050250 三聚氰胺甲醛树脂的光学性质=Optical Properties of Melamine Formaldehyde Resin[刊, 中]/刘海波(复旦大学),侯占佳…∥物理化学学报.&2000, 16(6).&563~567 对三聚氰胺甲醛树脂的合成过程、波导制备条件及利用三聚氰胺甲醛树脂作为掺杂基质的非线性光学性质进行了研究.实验结果表明,三聚氰胺甲醛树脂是一种极具有应用前景的光学材料.图3参14 国家自然科学基金(69708005,69808001)资助 O644 01050251 紫菜两个光系统间激发能分配研究对光合进化的启示[刊, 中]/潘洁(中科院化学所),施定基…∥科学通报.&2000, 45(12).&1276~1279 选择两个不同发育阶段(孢子体和配子体)的条斑紫菜作为研究对象.对过多激发能在两个光系统间的分配进行了比较研究.图2参13 国家自然科学基金(39890390,29733100)资助 O644 01050252 非线性光学配合物的化学研究[刊, 中]/左景林(南京大学),游效曾∥科学通报.&2000, 45(14).&1457~1464 从化学角度出发,在分子水平上研究和探索新型分子基非线性光学材料是一个新的研究领域.总结了近年来在新型二阶、三阶极化率和光限制等非线性光学配合物的化学研究方面所取得的进展.图6表2参46 国家自然科学基金(29631040)资助 O644 01050253 螺旋共轭化合物1′,3′,3′-三甲基-6-羟基螺旋[2H-1-苯并吡喃-2,2′-二氢吲哚]的结构、光谱、非线性光学性质和光异构化过程的理论研究=Theoretical Study of the Structures, Spectra, Nonlinear Second-Order Optical Properties and Photoisomerization Process of the Spiroconjugated Compound 1′,3′,3′-Trimethyl-6-Hydroxyspiro[2H-1-Benzopyran-2,2′-Indoline][刊, 中]/孙秀云(吉林大学),封继康…∥高等学校化学学报.&2000, 21(7).&1080~1085 用AM1和ZINDO方法研究了螺旋共轭化合物1′,3′,3′-三甲基-6-羟基螺旋[2H-1-苯并吡喃-2,2′-二氢吲哚](HBPS)及其光导构化产物的结构和光谱性质,从理论上研究了HBPS的光异构化反应过程,并在此基础上,用自编的完全态求和公式(SOS)程序计算了非线性光学系数.图4表7参17 国家自然科学基金(29873016)资助 O644 01050254 Af型自由基均聚反应的固化理论(Ⅲ)&&高分子凝胶网络缺陷=The Curing Theory of Af Type Free Radical Homopolymerization(Ⅲ)&&The Defects of Polymer Gel Network[刊, 中]/王海军(河北大学),赵敏…∥高等学校化学学报.&2000, 21(7).&1138~1141 应用高分子反应统计理论,分析了高分子网络的形成过程,讨论了Af型自由基均聚反应凝胶网络中的缺陷&&悬吊环的数目及其形成几率.图4参22 国家自然科学基金(29673018)资助 O646 01050255 微过氧化物酶-11修饰电极对O2和H2O2的电催化还原=Electrocatalytic Reduction of O2 and H2O2 at the Glass Carbon Electrode Modified with Microperoxidase-11[刊, 中]/杨辉(南京师范大学),黄志忠…∥物理化学学报.&2000, 16(6).&527~532 运用电化学循环伏安法和旋转圆盘电极技术研究了O2和H2O2在Nafion膜固定的微过氧化物酶-11修饰的玻碳电极上的电化学还原.图6参16 国家自然科学基金资助 O646 01050256 电沉积Co-Cu颗粒膜的巨磁电阻效应=Giant Magnetoresistance in Electro-Deposited Co-Cu Granular Film[刊, 中]/李浩华(兰州大学),黎超…∥物理化学学报.&2000, 16(6).&573~576 用电化学沉积法制备了Co-Cu纳米颗粒膜,并对这种膜的结构、磁性、巨磁电阻效应作了较详细的研究.图6参7 国家自然科学基金资助 O646 01050257 磷酸溶液中铝恒压阳极氧化的研究=Investigation of Aluminum Anodizing in Phosphoric Acid Solution at Constant Voltage[刊, 中]/王为(天津大学),郭鹤桐…∥天津大学学报.&2000, 33(3).&341~343 结果表明,随着电解电压的升高,形成的氧化铝多孔膜的阻挡层增厚,多孔层的孔径和胞径均增加,其原因与离子迁移等密切相关.图6参6 国家自然科学基金(69601006)资助 O646 01050258 二次微分简易示波伏安法测定痕量镍=Determination of Trace Nickel by Second-Order Differential Simple Oscillographic Voltammetry[刊, 中]/傅业伟(西北大学),高敏…∥应用化学.&2000, 17(3).&296~299 国家自然科学基金(29775018)资助 O646 01050259 Ml(NiCuAlZn)5储氢合金粉末的包覆处理=Encapsulation of Ml(NiCuAlZn)5 Hydrogen Storage Alloy Powder[刊, 中]/王一菁(南开大学),赵东…∥应用化学.&2000, 17(3).&310~312 国家"八六三”计划资助项目 O646 01050260 和厚朴酚电化学还原机理的研究=Theoretical Study on the Mechanism of Electrochemical Reductions Reaction of Honokiol[刊, 中]/孙成科(曲靖师范高等专科学校),龚思源…∥高等学校化学学报.&2000, 21(6).&912~917 用量子化学AM1、PM3方法研究了和厚朴酚分子的电化学还原反应机理.结果表明,和厚朴酚分子电还原的基团为两个烯丙基的双键,其中邻位烯丙基优先被还原,对位次之,整个还原反应中和厚朴酚得到4e和4H+,使两个烯丙基饱和,计算结果较好地说明了实验事实.图2表7参12 国家自然科学基金(29773007)资助 O646 01050261 Fourier自去卷积示波计时电位法的研究=Oscillographic Chronopotentiometry with Fourier Self-Deconvolution[刊, 中]/郑建斌(西北大学),张红权…∥高等学校化学学报.&2000, 21(7).&1037~1039 国家自然科学基金(29775018)资助 O646 01050262 用规整膜板对砷化镓的三维微结构图形加工刻蚀=Three-Dimensional Microfabrication on GaAs Using a Regular Patterns Mold[刊, 中]/董海苟(厦门大学),孙建军…∥电化学.&2000, 6(3).&253~257 以微齿轮图形结构作为规整模板.用约束刻蚀剂层技术对GaAs样品表面进行了加工刻蚀.在有捕捉剂H3AsO3存在的情况下,规则微齿轮图形能够很好地在样品表面复制.图5参6 国家自然科学基金重点项目(29833070)资助 O646 01050263 混凝土中钢筋的腐蚀行为研究=Corrosion Behavior of Reinforcing Steel in Concrete[刊, 中]/林荣归(厦门大学),胡融刚…∥电化学.&2000, 6(3).&305~310 钢筋在混凝土中受到高碱性环境的保护,耐蚀性好,但随着介质pH的降低、Cl-含量的上升,钢筋腐蚀电流升高;动电位阳极极化曲线的测试表明,钢筋的维钝电流增大,击穿电位负移,混凝土中钢筋的耐蚀性下降.图4表1参6 国家自然科学基金(59871043)资助 O647 01050264 天冬氨酸在Cu(001)表面吸附的扫描隧道显微镜研究=Adsorption of Aspartic Acid on Cu(001) Studied by Scanning Tunneling Microscopy[刊, 中]/王浩(北京大学),赵学应…∥物理学报.&2000, 49(7).&1316~1320 国家自然科学基金(19634010)资助 O647 01050265 共聚高分子吸附的Monte Carlo模拟=Monta Carlo Simulation of Adsorption of Diblock Copolymer at Solid-Liquid Interface[刊, 中]/陈霆(华东理工大学),刘洪来…∥化工学报.&2000, 51(4).&512~518 用Monte Carlo方法对选择性溶剂中两嵌段共聚高分子在固液界面的吸附进行了模拟,获得了吸附等温线以及吸附层厚度、链附着率、表面覆盖率、链节浓度分布等表征吸附层结构的信息,同时模拟获得了固液界面区吸附构型大小及分布等表征高分子构型的微观信息.图12表1参10 国家自然科学基金(29736170)资助 O647 01050266 无规共聚高分子溶液相平衡的Monte Carlo模拟=Monte Carlo Simulations of Phase Equilibria of Random Copolymer Solutions[刊, 中]/陈霆(华东理工大学),刘洪来…∥化工学报.&2000, 51(4).&552~554 用构型偏倚蒸发Monte Carlo方法模拟研究了密堆积格子模型上A、B无规共聚高分子的相平衡问题,无规共聚高分子中链节A、B以不同的相互作用能来区别.模拟获得了链长直至200个链节的无规共聚高分子系统相平衡数据,同时计算获得了不同链长固定组成下无规共聚高分子系统相应的临界点.图2表1参12 国爱自然科学基金(29736170)资助 O648 01050267 Triton X-100/正癸醇/水层状液晶制备泡囊=Preparation of Vesicles from Lamellar Liquid Crystal in Triton X-100/n-C10H21OH/H2O System[刊, 中]/丁元华(扬州大学),刘天晴…∥物理化学学报.&2000, 16(6).&481~486 以Triton X-100/n-C10H21OH/H2O体系生成的层状液晶为介质制备泡囊,所得泡囊分布比较均匀,囊径在0.2~0.5 μm之间.研究了层状液晶组成、pH、超声振荡时间等因素对所制泡囊的电位及微极性的影响.图6表2参16 国家自然科学基金(29673035)资助 O648 01050268 表面波技术研究TBP对C12E8表面流变性质的影响=Influence of TBP on the Surface Rheological Properties of C12E8 Studied by Surface Wave Method[刊, 中]/韩国彬(厦门大学),吴金添…∥物理化学学报.&2000, 16(6).&507~511 利用表面波技术研究消泡剂TBP对起泡剂C12E8表面流变性质的影响,阐述泡沫的排液过程中液膜变形所产生的表面张力梯度修复机理以及液膜强度与表面膨胀模量、表面膨胀弹性和表面膨胀粘度的关系,并且探讨了消泡剂TBP的消泡机理.图4参6 国家自然科学基金(29973033)资助 O648 01050269 制备宽温区O/W微乳的新方法=Novel Method to Prepare O/W Microemulsions within a Wide Temperature Range[刊, 英]/梁文平(中科院化学所),Tharwat F Tadros∥物理化学学报.&2000, 16(6).&538~542 通过把一个带有羧基的离子表面活性剂镶嵌在微乳界面的单分子层中,在低pH值时,形成水包油微乳,然后用氢氧化钠中和使其表面离子化而形成一个较厚的双电层,从而得到的宽温区(0-90℃)水包油微乳.研究了油相浓度、pH以及微乳液滴的大小对体系的浊点的影响.图5参12 国家自然科学基金资助 O65 01050270 Triton X-100与牛血清白蛋白的相互作用=The Interaction between Triton X-100 and Bovine Serum Albumin[刊, 中]/魏晓芳(中科院化工冶金所),刘会洲∥分析化学.&2000, 28(6).&699~701 国家自然科学基金重点项目资助 O65 01050271 球形铜离子模板缩聚物的制备及其选择吸附性能=The Preparation of Globular Copper(Ⅱ) Template Condensation Polymer and Its Behavior of the Selective Adsorption[刊, 中]/王旭东(南开大学),何锡文…∥分析化学.&2000, 28(7).&805~809 以苯酚、甲醛、四乙烯五胺为反应单体,铜离子为模板,反相悬浮聚合制备出球形离子模板缩聚物.该模板缩聚物对铜离子的吸附性能显著优于相应的非模板缩聚物.图6参3 国家自然科学基金(29775011)资助 O65 01050272 杯芳烃银离子敏感场效应晶体管传感器=Silver Ion-Sensitive Field-Effect Transistor Based on Calixarene[刊, 中]/陈朗星(南开大学),牛文成…∥分析化学.&2000, 28(7).&815~819 报道了硫醚取代的杯[4]芳烃化合物的合成,以此化合物为敏感材料,研制了聚氯乙烯膜的银离子敏感场效应晶体管(Ag+-ISFET)传感器.Ag+-ISFET传感器对银离子表现出优良的能斯特响应,该传感器对碱金属、碱土金属及过渡金属离子有极高的选择性.图5表1参13 国家自然科学基金(29975014)资助 O65 01050273 电极扩散层内物质浓度及分布研究方法进展=Development of Research Method of Concentration Observation and Distribution in Electrode Diffusion Layer[刊, 中]/杨玉书(重庆大学),夏之宁…∥分析化学.&2000, 28(7).&897~903 评述了测试电极扩散层内物质浓度及分布的各种方法,分别从方法原理、实验装置、影响因素及其应用等方面加以论述,评价了各种方法的特点,并对发展方向进行了展望.参52 国家自然科学基金(29775035)资助 O657 01050274 甲烷氧化偶联Na-W-Mn/SiO2催化剂的喇曼光谱=Raman Spectroscopy Characterization of Na-W-Mn/SiO2 Catalyst for Oxidative Coupling of Methane[刊, 中]/陈宏善(中科院兰州化学物理所),牛建中…∥物理化学学报.&2000, 16(6).&543~546 研究了A16061/SiCp复合材料表面双层稀土转化膜的微观结构以及化学组成,并对稀土转化膜对抗腐蚀性能进行了评估.结果表明,稀土转化膜能显著提高耐蚀性.图2表3参10 国家自然科学基金资助 O657 01050275 12-钼磷酸-葡聚糖包合物的研究=Study on the Inclusion Compound of 12-Molybdenum Phosphoric Acid with Dextran[刊, 中]/程贤C026(福建师范大学),苏英草…∥物理化学学报.&2000, 16(7).&658~662 福建省教委基金资助 O657 01050276 O/W微乳液中制备甲基丙烯甲酯-苯乙烯共聚物超细颗粒=Preparation of Methyl Methacrylate and Styrene Copolymer Ultrafine Particles in the Oil-in-Water Microemulsions[刊, 中]/钱君律(同济大学),甘礼华…∥同济大学学报(自然科学版).&2000, 28(3).&320~323 在甲基丙烯酸甲酯(MMA)-苯乙烯-环己烷/十六烷基三甲基溴化铵/水体系的O/W微乳液中,制备了粒径约58 nm球状甲基丙烯酸甲酯-苯乙烯共聚物超细颗粒.研究了影响粒子形态和大小的因素.图4表1参12 国家自然科学基金(29673030)资助 O657 01050277 基于小波神经网络的新型算法用于化学信号处理=A Novel Algorithm Based on the Wavelet Neural Network for Processing Chemical Signals[刊, 中]/蔡文生(中国科技大学),于芳…∥高等学校化学学报.&2000, 21(6).&855~859 基于紧支集正交小波神经网络的构造思想,用具有紧支集的B-样条函数的伸缩和平移替代小波函数,提出了一种新型算法,并将其应用于化学信号的处理,实现了信号的压缩和滤噪,与自适应小波神经网络相比,学习速度得到了大幅度的提高.图4表2参9 国家自然科学基金(29775001)资助 O657 01050278 改进溶胶-凝胶法固定酶结构剖析及在苯酚光化学传感器中的应用=The Microstructure Analysis of Enzymes Immobilized by Sol-Gel Method and Its Application in Phenol Optical Chemical Sensor[刊, 中]/李军(湖南大学),王柯敏…∥高等学校化学学报.&2000, 21(7).&1018~1022 结果表明,酶固定于溶胶-凝胶中后,与在溶液中一样,呈均匀分布且不易流失.此敏感膜可用于制备基于化学发光强度减弱的苯酚光化学传感器;用竞争反应的原理讨论了响应机理.图3表1参20 国家自然科学基金(29675005)及国家杰出青年基金(29825110)资助 O657 01050279 一种用于电热蒸发-原子光谱的微型化固相萃取技术=A Miniaturization Solid-Phase Extraction Technique Designed for Electrothermal Vaporization-Atomic Emission Spectrometry Determination[刊, 中]/熊宏春(武汉大学),胡斌…∥高等学校化学学报.&2000, 21(7).&1035~1036 国家自然科学基金(29875022)资助 O657 01050280 多环芳烃芴、苊的无保护流体室温磷光性质研究=Studies on Non-Protected Fluid Room Temperature Phosphorescence of Polycyclic Aromatic Hydrocarbon of Fluoren and Acenaphthene[刊, 中]/李隆弟(清华大学),牟兰…∥高等学校化学学报.&2000, 21(7).&1040~1042 国家自然科学基金(29775013)资助 O657 01050281 高效液相色谱/大气压化学电离质谱快速分析水中痕量有机磷农药=Rapid Analysis of Trace Organophosphorous Pesticides in Water by High Performance Liquid Chromatography/Atmospheric Pressure Chemical Ionization Mass Spectrometry[刊, 中]/潘元海(中科院生态环境研究中心),金军…∥分析化学.&2000, 28(6).&661~671 用反相液谱短柱实现了6种有机磷农药(乙酰甲胺磷,甲基对硫磷、杀螟硫磷、喹硫磷、二嗪农、辛硫磷)的高效液相色谱/大气压化学电离质谱(HPLC/APCIMS)快速分析.此技术可以很好地实现水中痕量有机磷农药的测定,一次联机分析仅需10 min.图3表2参11 国家自然科学基金(29977023)资助 O657 01050282 氧氟沙星对映体的同步-导数荧光光谱法识别与测定=Recognition and Determination of Ofloxacin Enantiomers by Synchronization-Derivative Fluorimetry[刊, 中]/弓巧娟(山西大学),晋卫军…∥分析化学.&2000, 28(6).&672~677 控制pH=3,首次通过同步一阶导数荧光光谱技术,有效地识别和分辨氧氟沙星的R和S对映体,同时有效地消除尿样背景的干扰.据此建立了同时识别与测定两种旋光体的同步-导数荧光光谱法.图5表2参9 国家自然科学基金(29875016)资助 O657 01050283 一种新的重原子微扰剂氯代叔丁烷在亚硫酸钠化学除氧环糊精诱导室温磷光法中的应用研究=A Study of t-Butyl Chloride as Heavy Atom Perturber in Chemical Deoxygenation-Cyclodextrin Induced Room Temperature Phosphorimetry[刊, 中]/张淑珍(山西大学),魏雁声…∥分析化学.&2000, 28(6).&678~681 以氯代叔丁烷作重原子微扰剂采用亚硫酸钠化学除氧技术建立了菲、7,8-苯并喹啉、2-溴代萘在环糊精介质中的室温磷光分析法.图4表2参5 国家自然科学基金(29575204)资助 O657 01050284 小牛胸腺脱氧核糖核酸诱导中性红聚集的机理及其影响因素=The Aggregation of Neutral Red Encouraged by Deoxyribonucleic Acids and Its Depending Factors[刊, 中]/黄新华(西南师范大学),李原芳…∥分析化学.&2000, 28(6).&682~686 在pH7.6~7.8和低离子强度条件下,中性红与小牛脱氧核糖核酸(ctDNA)作用产生以535 nm为特征的共振光散射增强(ERLS)光谱.机理研究表明,这种ERLS是由于DNA诱导中性红的聚集所致.图6表1参11 国家自然科学基金(29875019)资助 O657 01050285 蛋白质样品的非竞争性毛细管电泳免疫分析激光诱导荧光检测=Noncompetitive Capillary Electrophoresis Based Immunoassay for Proteins with Laser Induced Fluorescence Detection[刊, 中]/王清刚(清华大学),罗国安…∥分析化学.&2000, 28(6).&687~691 国家自然科学基金重点资助 O657 01050286 亲和毛细管电泳测定孕酮与其单克隆抗体的结合常数=Determination of the Binding Constant between Progesterone and Its Monoclonal Antibody Using Affinity Capillary Electrophoresis[刊, 中]/王清刚(清华大学),王义明…∥分析化学.&2000, 28(6).&731~734 采用亲和毛细管电泳的配体分离模式,以激光诱导荧光作为检测手段,测定了荧光素标记的孕酮与孕酮单克隆抗体之间的结合常数,并研究了温育时间、电泳条件等因素对测定的影响.图3参5 国家自然科学基金重点资助 O657 01050287 钌(Ⅱ)-联吡啶-铈(Ⅳ)-戊二醛化学发光体系及其应用=Chemiluminescence System of Ru(bpy)2+3-Ce(Ⅳ)-Glutaraldehyde and Its Application[刊, 中]/韩鹤友(武汉大学),何治柯…∥分析化学.&2000, 28(6).&738~740 基于在硫酸介质中戊二醛增强铈(Ⅳ)氧化钌(Ⅱ)-联吡啶的化学发光强度.在优化后的条件下,方法的线性范围和检测限分别为2.5×10-6~2.5×10-3 mol/L和3.1×10-7 mol/L戊二醛.图1表1参6 国家自然科学基金(29605001)资助 O657 01050288 毛细管区带电泳法测定甲氧苄胺嘧啶和磺胺甲基异C023唑的离解常数及其在复方新诺明中的含量=Determination of Dissociation Constants of Trimethoprim and Sulfamethoxazole and Their concentrations in Co-Trimoxazole Tablets by Capillary Zone Electrophoresis[刊, 中]/李前锋(兰州大学),张红医…∥分析化学.&2000, 28(7).&793~797 国家自然科学基金(29475194和29675007)资助 O657 01050289 联用色谱数据的半自动解析法=Semiautomatic Deconvolution of Hyphenated Chromatographic Data[刊, 中]/甘峰(湖南大学),李晓宁…∥分析化学.&2000, 28(7).&833~836 采用正交投影法获得初始迭代光谱,继采用非负最小二乘法和常规最小二乘法进行交替迭代,最终获得纯光谱和纯色谱向量.图2参15 国家自然科学基金(29875007)资助 O657 01050290 陈皮挥发油的气相色谱/质谱分析=Determination of the Volatile Oil of Pericarpium Citri Reticulatae with Gas Chromatography/Mass Spectrometry[刊, 中]/龚范(湖南大学),梁逸曾…∥分析化学.&2000, 28(7).&860~864 用GC/MS分析复方制剂平胃散中的一种单味药材陈皮的挥发油化学成分及其相对含量.分离出53个组分,其中鉴定了34个组分,约占其挥发油总量的96.08%.图5表1参7 国家自然科学基金(29875007)资助 657 01050291 人工神经网络法鉴别红外光谱=Artificial Neural Network for the Identification of Infrared Spectra[刊, 中]/李燕(南京理工大学),王俊德…∥光谱学与光谱分析.&2000, 20(4).&477~479 将反向传播人工神经网络用于FTIR,鉴别未知化合物.结果表明,当训练集样本不含噪声时,纯光谱的预测结果很好.而当训练集样本有少量噪声干扰时,预测结果随预测集样本的不同,而得到了不同的改善.图3参6 国家自然科学基金资助 O657 01050292 苯丙氨酸桥联金属双卟啉的诱导圆二色光谱研究=The Study of Induced Circular Dichroism of Phenylalanine Bridged Metal Bis-Porphyrin[刊, 中]/刘海洋(华南理工大学),黄锦汪…∥光谱学与光谱分析.&2000, 20(4).&495~497 报道了邻位和对位桥联苯丙氨酸锌双卟啉的合成,考查了双卟啉的分子结构对诱导圆二色性的影响.结果表明,两个卟啉环之间的π-π堆积和手性激子偶合作用是影响此类双卟啉圆二色光谱的主要因素.图3参16 国家自然科学基金(29771034)资助 O657 01050293 砷和汞的顺序注射-蒸气发生原子吸收光谱测定=Sequential Injection Vapor Generation Atomic Absorption Spectrometric Determination of Mercury and Arsenic[刊, 中]/马泓冰(东北大学),徐淑坤…∥光谱学与光谱分析.&2000, 20(4).&529~532 建立了砷和汞的顺序注射-蒸气发生原子吸收光谱测定方法.在流动注射蒸气发生原子吸收光谱测定方法的基础上,采用汇流技术,通过两个微量注射泵和一个多位选择阀的计算机程控操作,实现待测组分与硼氢化钠间的强氧化还原反应及其气-液分离过程.图3表4参4 国家自然科学基金资助 O657 01050294 氢化物的气相富集及其在超痕量分析中的应用=The Gaseous Phase Enrichment Techniques in Hydride Generation (Review)[刊, 中]/郭旭明(厦门大学),黄本立…∥光谱学与光谱分析.&2000, 20(4).&533~536 从富集原理及其在光谱超痕量分析的应用方面分别对这几种氢化物发生后的气相富集技术进行了较详细地综述.这些气相富集方法包括液氮冷却捕集技术、气球收集技术、石墨炉原位捕集技术、吸收液吸收技术及固体吸附技术等.参63 国家自然科学基金资助 O657 01050295 pH诱导牛血清白蛋白芳香氨基酸残基微环境变化的光谱分析=Spectral Study of the Microenviroment Change of Aromatic Amino-Acid Residues in BSA Induced by pH[刊, 中]/魏晓芳(中科院化工冶金所),刘会洲…∥光谱学与光谱分析.&2000, 20(4).&556~559 用荧光光谱和紫外吸收光谱研究了pH=2.3~11.3范围内牛血清白蛋白芳香氨基酸残基微环境的变化,以此推断蛋白质构象的变化,并讨论蛋白质表面疏水性变化的趋势.图4表1参8 国家自然科学基金重点基金资助 O657 01050296 传感器几何结构对近红外组织氧合检测仪灵敏度的影响=The Influence of Probe Geometry on the Sensitivity of Tissue Oximeter Using Near Infra-Red Spectroscopy[刊, 中]/王峰(清华大学),丁海曙…∥光谱学与光谱分析.&2000, 20(4).&585~588 利用蒙特卡罗仿真方法对光在多层生物组织模型中的平均穿透深度、光子平均飞行距离和空间灵敏度分布进行了仿真,结果表明,传感器几何结构,即光源与光检测器之间的距离是影响灵敏度的重要因素,适当增加这一距离有助于深层组织生化信息的提取和测量灵敏度的提高,但是它又受到信噪比降低的限制.图8参3 国家自然科学基金资助 O657 01050297 精密气动液压伺服系统用于傅里叶变换光谱仪光谱测量=Spectral Measuring of Fourier Transform Spectrometer Using Pneumatic Hydraulic Servo System[刊, 中]/李志刚(中科院长春光学精密机械所),王淑荣…∥光谱学与光谱分析.&2000, 20(4).&589~591 讨论了傅里叶变换光谱仪动镜稳定平移的重要性,研制了以高压无氧氮气为动力源的精密气动液压系统用于推进在研傅里叶变换光谱仪"猫眼”动镜系统,并在此基础上测量了ZYGO干涉仪光源光谱图.图4参5 国家自然科学基金资助 O658 01050298 超临界流体色谱法分离手性化合物的进展=Advances in Chiral Separations by Supercritical Fluid Chromatography[刊, 中]/任其龙(浙江大学),苏宝根…∥分析化学.&2000, 28(6).&772~776 国家自然科学基金(29776040)资助 O658 01050299 长江口水体混合过程中溶解态稀土元素分布特征[刊, 中]/王中良(中科院地球化学所),刘丛强∥科学通报.&2000, 45(12).&1322~1326 采用液-液萃取与反萃取分离富集方法和ICP-MS测试技术,对长江河口南支盐度0.15~19 mg/g表层水体中溶解态稀土元素的浓度进行了测定.图2表1参17 国家杰出青年科学基金(49625304)资助 O658 01050300 分子烙印手性固定相分离过程热力学研究=Thermodynamic Study on Separation of Molecular Imprinting Chiral Stationary Phase[刊, 中]/王进防(中科院大连化学物理所),周良模…∥高等学校化学学报.&2000, 21(6).&930~933 结果表明,分子烙印手性固定相的分离过程为焓控制过程.随着温度的升高,样品的容量因子降低,手性选择因子α减小.样品与分子烙印固定相的作用力包括非特异作用力和特异作用力,只有特异作用力的差值才是手性分离的本质.表2参22 国家自然科学基金(29575212)资助 O658 01050301 十八烷基醚型高效液相反相色谱填料的制备=Synthesis and Characterization of Ether-Bond RP-Packing[刊, 中]/喻昕(中科院化学所),赵睿…∥高等学校化学学报.&2000, 21(7).&1043~1044 国家自然科学基金(29635010)资助