Microwave Assisted Synthesis and Spectral Analysis of Schiff Bases Derived from 2-Amino-5-Aryl-1,3,4-Oxadiazoles
作者:SANJEEV KUMAR、SNEHA YADAV、SUDHA JADON、VIPIN KUMAR、ABDALLA M. KHEDR、KISHAN C. GUPTA
DOI:10.13005/ojc/280438
日期:2012.12.22
Microwaveassistedsynthesis of new Schiffbasesderivedfrom 2-amino-5-substituted aryl- 1,3,4-oxadiazoles with substituted aromatic aldehyde have been carried out. The chemical structures of the prepared Schiffbases have been investigated by analytical and spectral methods.
Synthesis, spectral analysis, and molecular modeling of bioactive Sn(II)-complexes with oxadiazole Schiff bases
作者:Abdalla M. Khedr、Sudha Jadon、Vipin Kumar
DOI:10.1080/00958972.2011.569541
日期:2011.4.20
Sn(II)-complexes of seven 2-amino-5-substituted-aryl-1,3,4-oxadiazole Schiff bases have been synthesized and characterized by various physico-chemical studies. Their structures have been confirmed by elemental analyses, infrared, 1H NMR, UV-Vis, and mass spectral studies as well as thermal decomposition. Conductance measurements in methanol show these complexes to be non-electrolytes, and the molecular weight determinations support the proposed molecular formulae. The molecular structures of the complexes have been optimized by CS Chem 3-D Ultra Molecular Modeling and Analysis Program showing tetrahedral geometry. The bio-efficacy of the complexes has been examined against the growth of bacteria (Escherichia coli and Staphylococcus aureus) and fungi (Aspergillus flavus and Candida albicans) invitro to evaluate their anti-microbial potential.
Synthesis, spectral, thermal analyses, molecular modeling, and antimicrobial activities of Cu(II)-complexes with 1,3,4-oxadiazole Schiff-base derivatives
作者:Abdalla M. Khedr、Nadia A. El-Wakiel、Sudha Jadon、Vipin Kumar
DOI:10.1080/00958972.2011.557722
日期:2011.3.10
Seven Cu(II)-complexes with 2-amino-5-substituted aryl-1,3,4-oxadiazole Schiff bases are presented. The donors and possible geometries of the complexes were investigated by elemental and thermal (differential thermal analysis and thermogravimetric analysis) analyses, molar conductance, magnetic moments, IR, H-1-NMR, ESR, UV-Vis, and mass spectra. The ligands are bidentate, coordinating through the nitrogen of azomethine and the nearest nitrogen to it. The results are supported by 3-D molecular modeling of 2 using CS Chem 3-D Ultra Molecular Modeling and Analysis Program. The investigated complexes have been screened for in-vitro antibacterial (Escherichia coli and Staphylococcus aureus) and antifungal (Aspergillus flavus and Candida albicans) activities. The qualitative and quantitative antimicrobial activities prove that the complexes are very active against the tested microorganisms.