Synthesis and physico-chemical studies of newer mono and diperoxo heteroligand complexes of vanadium

Abstract

The synthesis of monoperoxo-vanadium(V) complexes, [VO(O2)QL] (Q = 8-quinolinolate and L = EtOH, DMF, DMSO, or THF), and diperoxovanadates(V), A3[VO(O2)2(HPO4)]•2H2O (A = K or NH4) are described. While the [VO(O2)QL] complexes have been synthesized from the reaction of V2O5 with H2O2 and a solution of 8-quinolinol in different donor solvents (L) at pH ca. 2, the oxodiperoxo(hydrophosphato) vanadate(V) dihydrates, A3,[VO(O2)2(HPO4)]•2H2O, have been prepared from the reaction of V2O5 with H2O2 and phosphoric acid at pH 6 of the reaction medium. The compounds have been characterized by chemical analyses, magnetic susceptibility, and molar conductance measurements, and by IR, laser Raman, 1H NMR, and electronic spectroscopic studies. Evidence has been provided for triangularly bonded peroxide (O22−) and coordinated heteroligands. The existence and stability of the complex [VO(O2)2(HPO4)]3− in solution have been ascertained from solution Raman spectroscopy and conductance measurements.