Synthesis, spectra and electrochemistry of non-oxovanadium(IV) bischelates of tridentate schiff base ligands. Magnetism of bis[N-(2-hydroxyphenyl)-5-methylsalicylideniminato]vanadium(IV)

Abstract

Three non-oxo bis-chelated complexes of vanadium(IV) with the Schiff base N-(2-hydroxyphenyl)salicylideneamine and its substituted derivatives were synthesized and characterized by elemental analysis, conductivity measurements, magnetic and spectral data. Cyclic voltammetric experiments in DMF solution at a glassy-carbon working electrode reveal nearly reversible V^IV/V^III (-0.07 to -0.12 V vs S.C.E.) and V^III/V^II (-1.77 to -1.80 V vs S.C.E.). The corresponding vanadium(III) species has been generated by chemical/electrochemical reduction of the vanadium(IV) complexes and characterized by their absorption spectra and cyclic voltammetry.