Electrochemistry of vanadium complexes of o-N-salicylideneaminoethylphenol. A well characterized cyclic mechanism for the gain or loss of vanadyl oxygen

Abstract

The electrochemistry of two vanadium complexes of o-N-salicylideneaminoethylphenol, VO(HSalamp) 2 ( 1) and [VO(Salamp)] 2O ( 2), is reported. The oxidation of 1, V(V)/V(IV), is completely reversible. The electrochemical properties of V(IV)/V(III) of 1 are complex and the results support a well characterized cyclic scheme mechanism. The redox reactions are accompanied by the conversions between five-coordinate oxovanadium(IV) complex and six-coordinate vanadium(III) complex by losing or gaining vanadyl oxygen. Oxidation-state-dependent change in coordination environment was also seen in the electrochemical behaviour of the complex 2.