Synthesis, Characterization, Structures, and Catalytic Property of Oxovanadium(Ⅴ) Complexes with Hydrazone Ligands

摘要

The reaction of [VO(Acac)_2] with 4-methyl-N'-[(2-hydroxy-1-naphthyl)methylidene]benzohy-drazide (H2L~1) and 4-methyl-N'-[1-(2-hydroxynaphthyl)ethyiidene]benzohydrazide (H2L~2), respectively, in methanol, affords two new oxovanadium(Ⅴ) complexes [VO(OMe)L~1]_2 (Ⅰ) and [VO(OMe)L~2] (Ⅱ). Both complexes have been characterized by elemental analysis, IR, and single crystal X-ray diffraction methods. Complex Ⅰ is a methoxide-bridged dinuclear oxovanadium(Ⅴ) compound, while complex Ⅱ is a mononuclear oxovanadium(Ⅴ) compound. The dinegative hydrazone ligands coordinate to the metal atoms through phe-nolate, imine, and deprotonated amide donor atoms. The geometry around vanadium atom in Ⅰ is a distorted VNO5 octahedron, while that in Ⅱ is a VNO4 square pyramid. Both complexes have effective catalytic property for the sulfoxidation reaction.