Synthesis, X-ray structural characterization, and catalytic property of binuclear oxidovanadium(V) complex with 2,4-dibromo-6-(5-methylamino-[1,3,4]thiadiazol-2-yl) phenol

A novel binuclear oxidovanadium(V) complex [V2O2(mu-O)L-2(OEt)(2)], where L is the deprotonated form of 2,4-dibromo-6-(5-methylamino-[1,3,4] thiadiazol-2-yl)phenol (HL), was prepared by the reaction of 2-(3,5-dibromo-2-hydroxybenzylidene)-N-methylhydrazinecarbothioamide (HL') and VO(acac)(2) in ethanol. The ligand L' underwent a cyclization during the coordination, to form a new ligand L. Structure of the complex was characterized by physicochemical methods and single-crystal X-ray determination. Crystal of the complex crystallizes in hexagonal space group R-3, with a = b = 33.302(3) angstrom, c = 15.308(2) angstrom, alpha = beta = 90 degrees, gamma = 120 degrees, V = 14702(3) angstrom, Z = 18, R-1 = 0.0823, wR(2) = 0.2064, S = 1.011. X-ray analysis indicates that the V atom in the complex is in an octahedral coordination environment, constructed by the phenolate O and thiadiazol N atoms of L, one oxido O atom, one bridging O atom, and one deprotonated ethanol O atom. The distance between the two V atoms is 3.365(1) angstrom. The complex has an effective catalytic property for the oxidation of several olefins.