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Chhapra, India

Srivastava K.P.,Jpuniversity | Srivastava K.P.,Nlscollege | Singh S.K.,Jpuniversity | Mishra B.P.,Jpuniversity
Der Pharma Chemica | Year: 2015

A rapid, efficient, clean and environmentally benign exclusive synthesis of Schiff bases as new ligands and their complexes with Co(II) have been developed using condensation of 3-phenyl-2-propyl-quinazolin-4(3H)-onewith semicarbazide (ppqs, L) and thiosemicarbazide (ppqt, L') efficiently using alkali catalyst with excellent yields under microwave irradiation. This method provides several advantages such as environmental friendliness, simple workup procedure, short reaction times, non-hazardous and excellent yield of products.The results are compared with conventional methods for their yield and reaction time. The Schiff base ligands and the complexes were characterized by micro-analytical, conductometric, magnetic and spectroscopic studies.All the Schiff bases were bidentate (NO donor) ligands. All complexes were found to be six co-ordinate and ML2[1:2 (metal: ligand) ratio] type. The complexes are coloured and stable in air. Source


Srivastava K.P.,Jpuniversity | Srivastava K.P.,Nlscollege | Singh S.K.,Jpuniversity | Mishra B.P.,Jpuniversity
International Journal of ChemTech Research | Year: 2014

A rapid, efficient, clean and environmentally benign exclusive synthesis of two Schiff bases as new ligands and their complexes with Cu(II) have been developed using condensation of 3-phenyl-2-propyl-quinazolin-4(3H)-one with semicarbazide (ppqs, L) and thiosemicarbazide (ppqt, L’) efficiently using alkali catalyst with excellent yields under microwave irradiation. This method provides several advantages such as environmental friendliness, simple work-up procedure, short reaction times, non-hazardous and excellent yield of products.The results are compared with conventional methods for their yield and reaction time. The Schiff base ligands and the complexes were characterized by microanalytical, conductometric, magnetic and spectroscopic studies.All the Schiff bases were bidentate (NO donor) ligands. All complexes were found to be six co-ordinate and ML2[1:2 (metal: ligand) ratio] type. The complexes are coloured and stable in air.Besides, ambient conditions, excellent product yields and MWI as a universal method display both economic and environmental advantages.Antimicrobial data suggests that the metal complexes are betterantibacterial agents as compared to their ligands. The complexes also inhibit thegrowth of bacteria to a greater extent as the concentration is increased. © 2014-2015, Sphinx Knowledge House. All rights reserved. Source

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