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The dinuclear complex [VO (L)]2 (μ-O) (HL = salicylaldehyde benzoylhydrazone) was synthesized and characterized by elemental analysis, IR, UV, cyclic voltammetry. The results showed that two oxygen atoms and one nitrogen atom of the tridentate hydrazone ligand are coordinated to vanadium(Ⅴ) atom. The vanadium atom approximates to a distorted square pyramidal coordination sphere. The redox potentials of the title complex in different solvents follow the order:CH2Cl2<CH3CN<DMF.