Abstract: Complex VO(C₁₀H₉NO₃)(C₁₃H₁₀NO₂)(C₁₀H₉NO₃^2-=N-salicylidene-L-alaninate, C₁₃H₁₀NO₂^-=N-phenylbenzohydroxamate) was synthesized and characterized by means of elemental analysis, IR, UV, ¹H NMR spectroscopies, cyclic voltammetry and single crystal X-ray diffraction.The complex crystallized in a monoclinic system with space group P2₁ and crystal cell parameters a=0.9720(1) nm, b=1.8274(2) nm, c=1.2542(1) nm, β=104.868(9)°, V=2.1532(4) nm³, M_r=470.34, Z=2.The two oxygen atoms and the one nitrogen atom of the tridentate Schiff base ligand and the one oxime oxygen atom of the hydroxamate ligand coordinate to the vanadium atom, forming an equatorial plane, the two axial positions are respectively occupied by the oxygen atom of the oxovanadium and the carbonyl oxygen atom of the hydroxamate and the vanadium atom exhibits a distorted octahedral VO(ONO)(OO) coordination sphere.The ¹H NMR spectrum suggests that the two isomers, endo and exo in a molar ratio of 1/1.7, coexist in the solution of the title complex in CDCl₃.There exists a quasi-reversible one-electron redox reaction corresponding to V^Ⅴ/V^Ⅵ couple in the three non-aqueous solvents, and the redox potential E_1/2 of the title complex substantially shifts in the direction of the positive voltage increase in the order: CH₂Cl₂＜CH₃CN＜DMF.

Key words: Oxovanadium complex, Hydroxamate complex, Crystal structure, Spectral property