Mono- and polynuclear vanadium(IV) and -(V) compounds with 2-substituted phenyl/pyridyl heterocyclic chelates

Upon reacting ammonium vanadate with 2-hydroxyphenylbenzothiazole (Hobs) and 2-hydroxyphenylbenzothiazole (Hobz), the paramagnetic vanadium(IV) compound, [VO(obs)2]n (1) and the diamagnetic vanadium(V) complex, cis-[VO2(obz)py] (2) were isolated, respectively. The 2:1 molar reaction between 2-pyridylbenzimidazole (Hpybz) and VOSO4 afforded complex 3.H2O, [VO(Hpbyz)2SO4] in good yield.