Synthesis, Crystal Structures, and Catalytic Property of Dioxomolybdenum(VI) Complexes with Hydrazones

摘要

Two new dioxomolybdenum(VI) complexes, [MoO2(L~1)]_m · 0.5nCH3OH (I) and [MoO2(L~2)(CH3OH)] (II), where L~1 and L~2 are the dianionic form of N-[1-(4-diethylmino-2-hydroxy-phenyl)methyhdene]isonicotinohydrazide and N-(2-hydroxy-4-methoxybenzylidene)-3-methylbenzohy-drazide, respectively, were prepared and structurally characterized by physicochemical and spectroscopic methods and single-crystal X-ray determination. For complex I, a polymeric structure is obtained, which is linked by coordination of the pyridine N atoms to the Mo atoms of other [MoO2(L~1)] units. Complex II is a mononuclear molybdenum compound. In both complexes, the Mo atoms are in octahedral coordination. The catalytic properties of the complexes indicate that they are efficient catalysts for sulfoxidation.