New dibutyltin(IV) complexes of Schiff base derived from 5-chloroindoline-2,3-dione, indoline- 2,3-dione with amino acids (tryptophan, alanine and valine) were synthesized and characterized by elemental analysis, IR, ...New dibutyltin(IV) complexes of Schiff base derived from 5-chloroindoline-2,3-dione, indoline- 2,3-dione with amino acids (tryptophan, alanine and valine) were synthesized and characterized by elemental analysis, IR, electronic spectra, conductance measurements, and biological activity. The analytical data showed that the Schiff base ligand acts as bidentate towards metal ions via the azomethine nitrogen and carboxylate oxygen by a stoichiometric reaction of M:L (1:2) to form metal complexes. NMR (1H, 13C and 119Sn) spectral data of the ligands and metal complex agree with proposed structures. The conductivity values between 14 - 27 ohm-1cm2mol-1 in DMF imply the presence of non-electrolyte species. 3D molecular modeling and analysis of bond lengths and bond angles have also been conducted for a representative compound, [Bu2Sn(L2)2], to substantiate the proposed structures. Antibacterial results indicate that the metal complexes are more active than the free ligands.展开更多
Benzaldehyde has been trimethylsilylcyanated with a catalyst prepared in situ from titanium tetraisopropoxide and chiral Schiff bases. Cyanohydrin is obtalned in moderate e.e.values
The reaction of VCl3 with 4-（2, 4-dihydroxybenzaldimine） antipyrine （LH） in a l ： 1 molar ratio results in formation of the general complex of [VOL（CI）OH]. The nature of bonding and stereochemistry of the compl...The reaction of VCl3 with 4-（2, 4-dihydroxybenzaldimine） antipyrine （LH） in a l ： 1 molar ratio results in formation of the general complex of [VOL（CI）OH]. The nature of bonding and stereochemistry of the complex was deduced from the elemental analysis, IR, UV-Vis, 1H and ^13C NMR spectroscopy. This complex has a coordination number five （square pyramidal） as known for many vanadyl complexes. The formation of the vanadyl ion （VO^2＋） and the mode of bonding of the Schiff base through the oxygen of the pyrazol ring and the nitrogen of the azomethine group to the vanadyl ion were established by IR technique.展开更多
为开发具有新生物活性的非铂系前药,采用化学方法合成新的均三唑席夫碱(Ⅳ)配合物,并利用元素分析、1 H NMR、13 C NMR和MS等进行结构表征.在模拟生理条件(pH=7.40)下,以吖啶橙(AO)作为光谱探针,采用紫外(UV)及荧光光谱方法研究配合物...为开发具有新生物活性的非铂系前药,采用化学方法合成新的均三唑席夫碱(Ⅳ)配合物,并利用元素分析、1 H NMR、13 C NMR和MS等进行结构表征.在模拟生理条件(pH=7.40)下,以吖啶橙(AO)作为光谱探针,采用紫外(UV)及荧光光谱方法研究配合物与鲱鱼精DNA的作用机制.结果表明:合成得到的新的均三唑席夫碱钛(Ⅳ)配合物与DNA之间的作用机制为嵌插作用和静电作用.展开更多
文摘New dibutyltin(IV) complexes of Schiff base derived from 5-chloroindoline-2,3-dione, indoline- 2,3-dione with amino acids (tryptophan, alanine and valine) were synthesized and characterized by elemental analysis, IR, electronic spectra, conductance measurements, and biological activity. The analytical data showed that the Schiff base ligand acts as bidentate towards metal ions via the azomethine nitrogen and carboxylate oxygen by a stoichiometric reaction of M:L (1:2) to form metal complexes. NMR (1H, 13C and 119Sn) spectral data of the ligands and metal complex agree with proposed structures. The conductivity values between 14 - 27 ohm-1cm2mol-1 in DMF imply the presence of non-electrolyte species. 3D molecular modeling and analysis of bond lengths and bond angles have also been conducted for a representative compound, [Bu2Sn(L2)2], to substantiate the proposed structures. Antibacterial results indicate that the metal complexes are more active than the free ligands.
文摘Benzaldehyde has been trimethylsilylcyanated with a catalyst prepared in situ from titanium tetraisopropoxide and chiral Schiff bases. Cyanohydrin is obtalned in moderate e.e.values
文摘The reaction of VCl3 with 4-（2, 4-dihydroxybenzaldimine） antipyrine （LH） in a l ： 1 molar ratio results in formation of the general complex of [VOL（CI）OH]. The nature of bonding and stereochemistry of the complex was deduced from the elemental analysis, IR, UV-Vis, 1H and ^13C NMR spectroscopy. This complex has a coordination number five （square pyramidal） as known for many vanadyl complexes. The formation of the vanadyl ion （VO^2＋） and the mode of bonding of the Schiff base through the oxygen of the pyrazol ring and the nitrogen of the azomethine group to the vanadyl ion were established by IR technique.
文摘为开发具有新生物活性的非铂系前药,采用化学方法合成新的均三唑席夫碱(Ⅳ)配合物,并利用元素分析、1 H NMR、13 C NMR和MS等进行结构表征.在模拟生理条件(pH=7.40)下,以吖啶橙(AO)作为光谱探针,采用紫外(UV)及荧光光谱方法研究配合物与鲱鱼精DNA的作用机制.结果表明:合成得到的新的均三唑席夫碱钛(Ⅳ)配合物与DNA之间的作用机制为嵌插作用和静电作用.
