SYNTHESIS AND CHARACTERIZATION OF OXOVANADIUM(IV) COMPLEXES OF SCHIFF-BASES DERIVED FROM 4-AMINOANTIPYRINE

A new series of eighteen complexes of oxovanadium(IV) with the Schiff bases of 4-aminoantipyrine, viz. 4-[(N-benzalidene)amino] antipyrine ( BAAP), 4-[(N-4-dimethyl-aminobenzalidene) amino] antipyrine (DABAAP) a nd 4-[(N-4-methoxybenzalidene)amino] antipyrine (MBAAP) with the gener al formula VOX2.nL (X = Cl, Br, I, NO3, NCS, n = 1; X = ClO4, n = 2 an d L = Schiff base) have been prepared and characterized on the basis o f analytical conductance, molecular weight, magnetic moment, infrared and electronic spectral data. The infrared data of the complexes revea l the bidentate nature of the ligands and coordinated to pyrazolone ox ygen and azomethine nitrogen atoms. The probable coordination number o f the central metal is found to be five. Thermal stabilities of the co mplexes have been studied through thermogravimetric analysis.