Liu Qing, Lin Jiahui, Liu Juan, Chen Wu, Cui Yongming
Acta Chim Slov. 2016;63(2):279-86. doi: 10.17344/acsi.2015.2125.
Two new cis-dioxomolybdenum(VI) complexes with general formula [MoO2L(MeOH)], where L = L1 = N'-(3,5-dibromo-2-hydroxybenzylidene)-4-trifluoromethylbenzohydrazide for complex 1, and L = L2 = N'-(3-bromo-5-chloro-2-hydroxybenzylidene)-4-trifluoromethylbenzohydrazide for complex 2, have been synthesized and fully characterized on the basis of elemental analysis, FT-IR, molar conductivity, and electronic spectra. The complexes are also characterized by single crystal X-ray diffraction. The complexes have distorted octahedral structures in which the aroylhydrazones behave as dianionic ligands. It is also revealed from the crystal structures that the Mo(VI) center adopts NO5 donor environment, and the octahedral coordination is furnished by two oxido groups and oxygen atoms of neutral methanol molecules. The catalytic properties were investigated for epoxidation of cyclooctene using aqueous tert-butyl hydroperoxide as the oxidant.
合成了两种通式为[MoO₂L(MeOH)]的新型顺式二氧代钼(VI)配合物，其中配合物1的L = L1 = N'-(3,5-二溴-2-羟基亚苄基)-4-三氟甲基苯甲酰肼，配合物2的L = L2 = N'-(3-溴-5-氯-2-羟基亚苄基)-4-三氟甲基苯甲酰肼，并通过元素分析、傅里叶变换红外光谱(FT-IR)、摩尔电导率和电子光谱对其进行了全面表征。这些配合物还通过单晶X射线衍射进行了表征。配合物具有扭曲的八面体结构，其中芳酰腙作为双阴离子配体。晶体结构还表明，Mo(VI)中心采用NO5供体环境，八面体配位由两个氧化基团和中性甲醇分子的氧原子提供。以叔丁基过氧化氢水溶液为氧化剂，研究了其对环辛烯环氧化的催化性能。
