The free ligands, 2-{(o-hydroxyaryl) azo}-1-N-salicylidene phenylamine, H2L [where H2L= RC6H4NNC6H4NCH-C6H4OHR= pH for H2L1, p-Me for H2L2 and p-Cl for H2L3], were prepared by the condensation of salicylaldehyde with 2-{(o-hydroxy aryl) azo} aniline. Reaction of H2L with VOSO4 afforded the oxovanadium complex,(L) V (O)(H2O). The (L1) V (O)(H2O) complex displays two reversible responses at 0.7 V and− 0.65 V vs. SCE in ...