Faheim, Abeer A.; Abdou, Safaa N.; Abd El-Wahab, Zeinab H.
Salicylidene (4-aminotoluene-3-sulfonic acid) Schiff base ligand H2L, and its binary and ternary Co(II), Ni(II), Cu(II) and Zn(II) complexes using 8-hydroxyquinoline (8-HOqu) and 2-aminopyridine (2-Ampy) as secondary ligands have been synthesised and characterized via elemental analysis, spectral data (IR, 1H NMR, mass and solid reflectance), molar conductance, magnetic moment, TG-DSC measurements and XRPD analysis. Correlation of all spectroscopic data suggest that H2L ligand acts as monoanionic terdentate ligand with ONO sites coordinating to the metal ions via deprotonated phenolic-O, azomethine-N and sulfonate-O while 2-Ampy behaves as a neutral monodentate ligand via amino group-N and 8-HOqu behaves as a monoanionic bidentate ligand through the ring-N and deprotonated phenolic-O. The thermal behavior of these complexes shows that the coordinated water molecules were eliminated from the complexes at relatively higher temperatures than the hydrated water and there are two routes in removal of coordinated water molecules. All complexes have mononuclear structure and the tetrahedral, square planar or an octahedral geometry have been proposed. The ligand and its complexes have been screened for their antimicrobial activity against Staphylococcus aureus, Bacillus subtilis, Escherichia coli, Salmonella typhimurium, Candida albicans and Aspergillus fumigatus. Among the synthesised compounds, the binary and ternary Ni(II) complexes, (2, 8 and 10) and ternary Zn(II) complex, (12) were found to be very effective against Candida albicans and Bacillus subtilis than all other complexes with MICs of 2 and 8 μg/mL, respectively.
Ovchinnikova, L P; Bogdanova, L A; Kaledin, V I
Pentachlorophenol (aromatic amine and azo stain metabolic stimulation inhibitor) reduced the hepatocarcinogenic activity of 4-aminoazobenzene and reduced that of ortho-aminoazotoluene in suckling mice. Both 4-aminoazobenzene and ortho-aminoazotoluene exhibited mutagenic activity in Ames' test in vitro on S. typhimurium TA 98 strain with activation with liver enzymes; this mutagenic activity was similarly suppressed by adding pentachlorophenol into activation medium. Induction of xenobiotic metabolism enzymes, stimulating the mutagenic activity of ortho-aminoazotoluene, suppressed its carcinogenic effect on mouse liver. Hence, ortho-aminotoluene (the initial compound), but not its mutagenic metabolites, was the direct active hepatocarcinogen for mice.
Sareen, Shweta; Mutreja, Vishal; Singh, Satnam; Pal, Bonamali
SBA-15 modified with APTMS (3-aminopropyl trimethoxysilane) having pore diameter (∼8 nm) has been synthesized and impregnated with 1-10 wt.% Cu using Cu(NO3)2 as a metal source followed by calcination at 350 °C. As-prepared CuO/ap-SBA-15 powder showed changes in the color from white for bare SBA-15 to light green due to formation of anisotropic CuO nanoparticles that exhibited a characteristic plasmon absorption band at 359 and 747 nm. TEM studies showed a change in the morphology of CuO NPs as a function of increased Cu loading. Moreover, well dispersed CuO nanospheres (∼5-6 nm) and nanorods (aspect ratio ∼11-20 nm) having monoclinic crystal phase were observed within the mesoporous channels of SBA-15. Elemental mapping studies confirmed uniform distribution of CuO nanoparticles on the surface of SBA-15. An increase in surface area was also observed from 694 m(2) g(-1) for SBA-15 to 762 m(2) g(-1) for 10 wt.% Cu loading probably due to the deposition of excess of CuO nanoparticles on the outer siliceous surface. The catalytic activity also increased with Cu loading and 10 wt.% CuO/ap-SBA-15 catalyst displayed the highest catalytic activity for the reduction of m-chloronitrobenzene and m-nitrotoluene with 83% and 100% selectivity for m-chloroaniline and m-aminotoluene respectively.
王建华; 郭晓宇; 任畅; 渠弼
Objective:To search for compounds of Schiff base which have both vanillin's bioactivity and Schiff bases. They could be used as sedative,antiepileptic and anticancer drugs. Methods:Tetra-o-acetyl-α-D-vanillin-glucoside was synthesized by acetylation and bromination and other steps with glucose and vanillin. It was reacted with p-aminotoluene. Result: Compound V was obtained and the structure of it was identified by PE 2400、IR、1 HNMR. Conclusion:Schiff base can be synthesized by structure reformation and modification on vanillin based on Combination Principle of Medicine .%目的：香草醛( vanillin)是一种重要的天然产物，具有镇静、催眠、止痛、抗癫痫等生物活性，希夫碱是具有抗炎、杀菌作用的亚胺类化合物。此项研究的目的就是要找到兼有香草醛的活性和希夫碱功效的化合物，筛选具有镇静、抗癫痫、抗癌的药物。方法：以葡萄糖、香草醛为原料经过乙酰化，溴代等步骤合成了中间体四乙酰葡萄糖香草醛苷，然后与对甲苯胺反应。结果：合成了目标化合物V。结论：对目标化合物V用元素分析( PE 2400)、红外光谱(IR)、核磁共振氢谱(1 HNMR)、进行结构表征，分析证实所合成的化合物与预期结构一致。