Metal complexes bearing 2-(imidazol-2-yl)phenol ligands: synthesis, characterization and catalytic performance in the fixation of carbon dioxide with epoxides

被引:18
作者
Peng, Jing [1 ]
Yang, Hai-Jian [2 ,3 ]
Wei, Zidong [1 ]
Guo, Cun-Yue [4 ]
机构
[1] Chongqing Univ, Coll Chem & Chem Engn, State Key Lab Power Transmission Equipment & Syst, Chongqing 400044, Peoples R China
[2] South Cent Univ Nationalities, Key Lab Catalysis & Mat Sci State Ethn Affairs Co, Coll Chem & Mat Sci, Wuhan, Peoples R China
[3] South Cent Univ Nationalities, Key Lab Analyt Chem State Ethn Affairs Commiss, Coll Chem & Mat Sci, Minist Educ, Wuhan, Peoples R China
[4] Univ Chinese Acad Sci, Sch Chem & Chem Engn, Beijing, Peoples R China
来源
RSC ADVANCES | 2015年 / 5卷 / 65期
基金
中国国家自然科学基金;
关键词
IONIC LIQUIDS EFFICIENT; CYCLIC CARBONATES; ORGANIC CARBONATES; CYCLOHEXENE OXIDE; PROPYLENE-OXIDE; CO2; FIXATION; CYCLOADDITION; GREEN; TRANSFORMATION; FRAMEWORK;
D O I
10.1039/c5ra08237d
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A series of metal complexes bearing 2-(imidazol-2-yl) phenol ligands (Zn, Cu, Ni, Co, Pb) were synthesized and their structures were characterized by IR, NMR, elemental analysis and X-ray. The catalytic activities of all complexes for the coupling reaction of CO2 and epoxide were then detected. The activity influence factors, such as temperature, time, pressure, substituents of ligands and metal centre, were systematically investigated. All these complexes were efficient to catalyze the coupling of CO2 and epoxide to generate cyclic carbonate in perfect yields (>90%) and selectivities (>99%) under optimized conditions of (2 MPa, 5 h, 110 degrees C) without any organic solvents. A 99.7% yield and >99% selectivity for propylene carbonate (PC) were obtained with C-7/n-Bu4NI as catalyst system under the optimized conditions. The catalysts were also proved to be applicable to other terminal epoxides. It is worthy noted that the Pb(II) complex was firstly used to catalyze the coupling reaction of epoxides with carbon dioxide. Moreover, these metal catalysts were recyclable with only minor losses in catalytic activity after simple separation. Finally, a plausible mechanism was given.
引用
收藏
页码:53063 / 53072
页数:10
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