Mononuclear oxovanadium(Iv) complex containing VO(ONS) basic core: Synthesis, structure, thermal gravimetric analysis, and catalytic property

Abstract

ABSTRACTReaction of vanadyl(IV)-acetylacetonate with 3-ethoxy-2-hydroxybenzaldehyde 4-methylthiosemicarbazone and 2,2′-bipyridyl in methanol affords a mononuclear oxovanadium(IV) complex containing VO(ONS) basic core. The complex has been characterized by various physicochemical techniques (UV–Vis, IR, and elemental analysis), and single-crystal X-ray diffraction. X-ray crystal structure determination reveals that the complex crystallizes as triclinic space group P, with unit cell dimensions a = 10.073(2) Å, b = 11.272(3) Å, c = 11.338(3) Å, α = 87.291(2)°, β = 83.440(2)°, γ = 64.003(2)°, V = 1149.5(5) Å3, Z = 2, R1 = 0.0356, wR2 = 0.0867, S = 1.052. The V atom in the complex is octahedrally coordinated, with the tridentate ONS ligand occupying the meridional sites. The nitrogen donor of 2,2′-bipyridyl ligand, occupying an apical position has a trans-labilizing influence, resulting in elongation of the V=O terminal bond. Thermal gravimetric analysis was performed to understand the stability of the complex. The complex shows high catalytic property and selectivity in the epoxidation of cyclohexene with t-butylhydroperoxide as oxidant.