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

ABSTRACT

A novel binuclear oxidovanadium(V) complex [V₂O₂(μ-O)L₂(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) Å, c = 15.308(2) Å, α = β = 90°, γ = 120°, V = 14702(3) ų, 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) Å. The complex has an effective catalytic property for the oxidation of several olefins.

KEYWORDS:

• Vanadium complex
• thiadiazol ligand
• synthesis
• crystal structure
• catalytic oxidation

Funding

This project was supported by the Scientific and Technological Research Program of Chongqing Municipal Education Commission (Grant No. KJ1401025), the Science and Technology of Wanzhou Science Committee (Grant No. 201403062), and the Youth Foundation of Three Georges University (Grant No. 13QN13).