Electrochemical and spectral behavior of mononuclear oxo-vanadium(IV)salicyldiimine complexes

Electrochemical and spectroscopic data of unsymmetrical and symmetrical mononuclear oxo-vanadium(IV)salicyldiimine complexes [VO(x,y-Sal)(x',y'-Sal)Phen)] and [VO(x, y-Sal)(x', y'-Sal)iPr)], where x, x' =5-H, 5-Br, 5-NO2 and y, y' =4-H, 4-MeO, were prepared and studied. Our results show tetradentate SalPhen or SaliPr coordinated in the equatorial plane. The electrochemical behavior is related to UV-Vis and IR spectra. Electron-withdrawing groups affected vanadium through pi-acceptor properties of imine and electron-donation groups through pi- and sigma-donation via phenolic oxygen.