ABSTRACT
A pair of new dioxomolybdenum(VI) complexes, [MoO2L1(CH3OH)] (1) and [MoO2L2(CH3OH)] (2), where L1 and L2 are the dianionic forms of 5-bromo-N′-(2-hydroxy-3-methoxybenzylidene)benzohydrazide and N′-(2-hydroxy-3-methoxybenzylidene)-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 = 7.779(2), b = 10.002(3), c = 12.012(3) Å, α = 93.612(2), β = 93.252(2), γ = 105.798(2)°, V = 894.9(4) Å3, Z = 2, R1 = 0.0536, wR2 = 0.0938. The crystal of 2 is triclinic: space group P−1, a = 7.830(2), b = 10.000(3), c = 11.842(3) Å, α = 92.795(2), β = 94.168(2), γ = 103.692(2)°, V = 896.4(4) Å3, Z = 2, R1 = 0.0293, wR2 = 0.0764. 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 methanol O atom, forming octahedral coordination. In the crystal structures, adjacent two complex molecules are linked by two methanol ligands through intermolecular O−H···N hydrogen bonds, forming dimers. The catalytic property of sulfoxidation for the complexes was studied.
Funding
This research was supported by the National Sciences Foundation of China (No. 20676057 and 20877036) and Top-class foundation of Pingdingshan University (No. 2008010).