Synthesis, Characterization and Crystal Structures of Oxidovanadium(V) and Dioxidomolybdenum(VI) Complexes Derived from 2-bromo-N'-(2-hydroxy-3-methoxybenzylidene)benzohydrazide with Catalytic Property

Resumo

A hydrazone compound 2-bromo-N'-(2-hydroxy-3-methoxybenzylidene)benzohydrazide (H₂L) was prepared and characterized by IR, UV-Vis and NMR spectra. Based on the hydrazone compound, a new oxidovanadium(V) and a new dioxidomolybdenum(VI) complexes, [VO(L)(OEt)(EtOH)] (I) and [MoO₂(L)(OH₂)] (II), were prepared and characterized by IR, UV-Vis, NMR spectra, and single crystal X-ray diffraction (CIF files nos. 1866755 (I) and 1866756 (II)). Complex I crystallizes as the monoclinic space group P2₁/c with unit cell dimensions a = 12.8733(12), b = 13.5088(13), c = 11.9262(11) Å, β = 91.765(2)°, V = 2073.0(3) ų, Z = 4, R₁ = 0.0524, wR₂ = 0.1329, GOOF = 1.245. Complex II crystallizes as the monoclinic space group P2₁/c with unit cell dimensions a = 8.1140(9), b = 16.2975(19), c = 13.4318(15) Å, β = 106.456(2)°, V = 1703.4(3) ų, Z = 4, R₁ = 0.0296, wR₂ = 0.0728, GOOF = 1.046. X-ray analysis indicates that the complexes are mononuclear species with the metal atoms in octahedral coordination. The complexes were studied for catalytic oxidation property on some olefins with tert-butyl hydrogen peroxide as oxidant.