WATER-SOLUBLE MIXED-LIGAND OXOVANADIUM(IV) COMPLEXES OF ACETYLACETONEAND ALDIMINE LIGANDS

Water soluble mixed-ligand oxovanadium(IV) complexes of sulphonated sa licylaldimine ligands of alpha-amino acids Na(2)HL.H2O[1, R=H, CH3, CH (CH3)(2) and CH(2)Ph] and acetylacetone of the formula Na-2[VO(L)(acac )].3H(2)O have been synthesized and characterized by IR, UV/VIS, EPR, magnetic moments and redox behaviour. The coordination sphere of the c omplexes are of the type VO(ONO)(OO), where O atoms are phenolic, carb oxylic, ketonic and enolic type and N is of azomethine type. The compl exes are one electron paramagnetic and show 1:2 electrolytic conductiv ity. The complexes display irreversible one electron oxidation peaks i n H2O in the range 0.46-0.55 V vs SCE.