SYNTHESIS AND CRYSTAL STRUCTURES OF DIOXOMOLYBDENUM(VI) COMPLEXES DERIVED FROM SIMILAR BENZOHYDRAZONE DERIVATIVES WITH CATALYTIC PROPERTY

Abstract

ABSTRACT A pair of new dioxomolybdenum(VI) complexes, [MoO 2 L 1 (MeOH)]·[MoO 2 L 1 (EtOH)] ( 1 ) and [MoO 2 L 2 (MeOH)]·[MoO 2 L 2 (EtOH)] ( 2 ), where L 1 and L 2 are the dianionic forms of N’ -(2-hydroxy-3-methoxybenzylidene)-2-hydroxy-3-methylbenzohydrazide and N’ -(3-ethoxy-2-hydroxybenzylidene)-2-hydroxy-3-methylbenzohydrazide, respectively, have been synthesized and characterized by elemental analysis, FT-IR spectra, and single crystal X-ray determination. The crystal of ( 1 ) is triclinic: space group P -1, a = 8.106(2), b = 13.412(3), c = 18.045(3) A, α = 83.634(2), β = 84.809(2), γ = 87.746(2)°, V = 1941.0(7) A 3 , Z = 2, R 1 = 0.0382, wR 2 = 0.0919. The crystal of ( 2 ) is triclinic: space group P -1, a = 7.350(2), b = 11.292(3), c = 24.914(3) A, α = 85.213(2), β = 82.411(2), γ = 71.012(2)°, V = 1936.1(7) A 3 , Z = 2, R 1 = 0.0425, wR 2 = 0.0877. The Mo atoms in the complexes are coordinated by one phenolate O, one imine N and one enolic O atoms of the benzohydrazone ligand, two oxo O atoms, and one solvate O atom, forming octahedral coordination. In the crystal structures, adjacent two complex molecules are linked by methanol and ethanol ligands through intermolecular O−H···O hydrogen bonds, forming dimers. The catalytic property of sulfoxidation for the complexes was studied.