Synthesis and Crystal Structures of Dioxomolybdenum(VI) Complexes With Similar Benzohydrazone Ligands

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. Supplemental materials are available for this article. Go to the publisher's online edition of Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry to view the supplemental file.