Synthesis and spectral studies of some oxovanadium(IV) and vanadium(IV) complexes

Complexes of oxovanadium(IV) with N,N'-ethylene-bis-(2-aminobenzamide) [EBA B], N,N'-propylene-bis-(2-aminobenzamide) [PBAB], N,N'-(o-phenylene)-bis-(2 -aminobenzamide) [PhBAB], N,N'-ethylene-bis-(3-carboxypropenamide) [EBCP], N,N'-propylene-bis-(3-carboxypropenamide) [PBCP](.) and 1-(2'-hydroxyphenyl )-3-phenyl-1,3-propanedione [HPPPD] have been prepared and characterized by chemical analyses, molar conductivity, magnetic susceptibility measurement s, thermal studies, IR, electronic and ESR spectra. Further, de-oxygenation reactions of these complexes with thionyl chloride yield vanadium(IV) comp lexes. The spectral data reveal that oxovanadium(IV) complexes are square p yramidal while the vanadium(IV) complexes are octahedral.