Syntheses, X-ray crystal structures and catalytic epoxidation of oxidovanadium(V) and dioxidomolybdenum(VI) complexes derived from <i>N′</i>-(4-Bromo-2-hydroxybenzylidene)benzohydrazide

A new mononuclear oxidovanadium(V) complex [VOL(OCH₃)(CH₃OH)] (<b>1</b>), and a new mononuclear dioxidomolybdenum(VI) complex [MoO₂L(CH₃OH)] (<b>2</b>), where H₂L=<i>N′</i>-(4-bromo-2-hydroxybenzylidene)benzohydrazide, have been synthesized and characterized on the basis of CHN elemental analysis, FT-IR and UV–Vis spectra. Structures of the complexes were further characterized by single crystal X-ray diffraction, which indicated that the V and Mo atoms in the complexes adopt octahedral coordination. The hydrazone behaves as a NOO tridentate ligand. The catalytic epoxidation properties on cyclooctene of the complexes were investigated.