合成了一种新的Zn(Ⅱ)配合物ZnCl2(L1)2] (1) (L1为 2-(2-噻吩)-1-(2-噻吩甲基)-1H-苯并咪唑),并采用NMR和IR光谱、元素分析、ESI-HRMS光谱测定和热重分析等对它进行了表征,其分子结构也由单晶X射线衍射确定.络合物1含有单核四面体Zn(Ⅱ)单元,即所谓的锁定的几何结构,这源自分子中存在弱的分子间S···π和π-π配体间相互作用.通过简易的合成路线即可制得苯并咪唑配体及其与Zn(Ⅱ)配合物.采用CO2与环氧化物耦合生成环状碳酸酯反应考察了1的催化活性,以及反应条件的影响.该配合物在无溶剂条件下可高效催化多种环氧化物的转化,具有较好的转化率,TONs和TOFs.%A new zinc(Ⅱ) complex of formula [ZnCl2(L1)2] (1) [L1 = 2-(2-thienyl)-1-(2-thienylmethyl)-1H-benzimidazole] was synthesized and fully characterized by nuclear magnetic resonance and infra-red spectroscopy, elemental analysis, electrospray ionization high-resolution mass spectrometry, and thermogravimetric analysis. The molecular structure was confirmed by single-crystal X-ray diffraction. Complex 1 consists of mononuclear tetrahedral zinc(Ⅱ) units with a locked geometry resulting from weak intramolecular S···π and π–π interligand interactions. The benzimidazole ligand and its zinc(Ⅱ) complex were readily obtained through a simple synthetic route. The catalytic activ-ity of 1 was investigated in the coupling of carbon dioxide with epoxides to produce cyclic car-bonates, and a series of parameters were evaluated. The complex efficiently catalyzed the transfor-mation of various epoxides under solvent-free conditions, with good conversions, turnover num-bers, and turnover frequencies.
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