Resumen de Synthesis and crystal structures of dioxomolybdenum(vi) complexes derived from similar benzohydrazone derivatives with catalytic property
Guo-ping Cheng, Ling-wei Xue, Wei-chun Yang, Gan-qing Zhao
A pair of new dioxomolybdenum(VI) complexes, [MoO2L¹(MeOH)HMoO2L¹(EtOH)] (1) and [MoO2L²(MeOH)HMoO2L²(EtOH)] (2), where L¹ and L² 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) Å, α = 83.634(2), β = 84.809(2), γ = 87.746(2)°, V = 1941.0(7) ų, Z = 2, R1 = 0.0382, wR2 = 0.0919. The crystal of (2) is triclinic: space group P-1, a = 7.350(2), b = 11.292(3), c = 24.914(3) Å, α = 85.213(2), β = 82.411(2), γ = 71.012(2)°, V = 1936.1(7) ų, Z = 2, R1 = 0.0425, wR2 = 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.
