Synthesis, crystal structures and catalytic epoxidation properties of dioxomolybdenum(VI) complexes with hydrazone ligands

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• 作者：Yong-Ming Cui ; Lu Qiao ; Yi Li ; Qian Wang ; Wu Chen…
• 刊名：Transition Metal Chemistry
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：42
• 期：1
• 页码：51-56
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Catalysis; Physical Chemistry; Inorganic Chemistry; Organometallic Chemistry;
• 出版者：Springer International Publishing
• ISSN：1572-901X
• 卷排序：42

文摘

A series of dioxomolybdenum(VI) complexes with similar hydrazone ligands have been prepared, specifically [MoO₂L1(MeOH)] (1), [MoO₂L2(MeOH)] (2) and [MoO₂L3(MeOH)] (3), where L1, L2 and L3 are the dianionic forms of 2-chloro-N′-(2-hydroxybenzylidene)benzohydrazide, 2-chloro-N′-(2-hydroxy-5-methylbenzylidene)benzohydrazide and N′-(3-bromo-5-chloro-2-hydroxybenzylidene)-2-chlorobenzohydrazide, respectively. The complexes were characterized by physicochemical and spectroscopic methods and also by single-crystal X-ray determination. The hydrazone ligands coordinate to the Mo atoms through their phenolate O, imine N and enolic O atoms. The Mo atoms are six-coordinated in octahedral geometries. The complexes show high catalytic activities and selectivities in the epoxidation of cyclohexene with tert-butylhydroperoxide as primary oxidant.