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Two oxidovanadium(V) complexes, [VOL 1 (OEt)] ( 1 ) and [V 2 O 2 (L 2 ) 2 (OEt) 2 ] ( 2 ), where L 1  and L 2  are the anions of 2-amino- N′ -(2-hydroxybenzylidene)benzohydrazide (H 2 L 1 ) and  N′ -(2-hydroxybenzylidene)-4-hydroxybenzohydrazide (H 2 L 2 ), respectively, have been synthesized and characterized by elemental analysis, infrared and electronic spectra, and  1 H NMR spectra. Structures of the complexes were further confirmed by single-crystal X-ray determination. The V atom in the mononuclear complex  1  is in square pyramidal coordination, and those in the dinuclear complex  2  are in octahedral coordination. Both aroylhydrazone ligands coordinate to the V atoms through the phenolate O, imino N, and enolate O atoms. The ethanol ligand in complex  1  is in terminal coordination mode, while that in complex  2  is in bridging coordination mode. The complexes function as effective olefin epoxidation catalysts with hydrogen peroxide as terminal oxidant and sodium hydrogen carbonate as a co-catalyst.

Synthesis, crystal structures and catalytic activity of oxidovanadium(V) complexes with tridentate ONO aroylhydrazone ligands