Abstract
Two new dioxomolybdenum(VI) complexes, [MoO2L1(EtOH)] (1) and [MoO2L2(H2O)] (2), where L1 and L2 are the dianionic forms of N′-(3-ethoxy-2-hydroxybenzylidene)-4-hydroxybenzoh- ydrazide and N′-(3-ethoxy-2-hydroxybenzylidene)-2-methylbenz- ohydrazide, 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 = 7.806(2), b = 9.947(2), c = 12.225(3) Å, α = 82.915(2), β = 89.845(2), γ = 78.063(2)°, V = 921.4(4) Å3, Z = 2, R 1 = 0.0374, wR 2 = 0.1041. The crystal of (2) is monoclinic: space group P21/c, a = 8.120(2), b = 25.848(2), c = 8.590(2) Å, β = 95.247(2)°, V = 1795.3(6) Å3, Z = 4, R 1 = 0.0473, wR 2 = 0.0734. Mo atoms in the complexes are coordinated by phenolic O, imino N, and enolic O atoms of the benzohydrazone ligand, oxo O atoms, and solvate O atom, forming octahedral coordination. In the crystal structure of (1), adjacent two molecules are linked through intermolecular O−H···N hydrogen bonds, forming dimers. The dimers are further linked through intermolecular O−H···O hydrogen bonds, forming 1D chains. In the crystal structure of (2), adjacent two molecules are linked through intermolecular O−H···N and O−H···O hydrogen bonds, forming dimers. The complexes have effective catalytic properties for sulfoxidation.
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Acknowledgments
This research was supported by the National Sciences Foundation of China (Nos. 20676057 and 20877036) and Top-Class Foundation of Pingdingshan University (No. 2008010).