Effects of imidazolium salts as cocatalysts on the copolymerization of CO2 with epoxides catalyzed by (salen)CrIIICl complex
Effects of imidazolium salts as cocatalysts on the copolymerization of CO2 with epoxides catalyzed by (salen)CrIIICl complex
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DOI：
10.1016/j.polymer.2007.05.008
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发表时间：
2007-06
期刊：
影响因子：
4.6
通讯作者：
Xiaoqin Xu;Congmin Wang;Haoran Li;Yong Wang;Weilin Sun;Zhi-quan Shen
中科院分区：
文献类型：
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作者：
Xiaoqin Xu;Congmin Wang;Haoran Li;Yong Wang;Weilin Sun;Zhi-quan Shen
首次将咪唑盐(主要是室温离子液体)引入到(Salen)CrIIICl络合物催化二氧化碳与环氧化物的共聚反应中。考察了不同烷基链的咪唑盐以及不同阴离子的咪唑盐对共聚反应的影响。结果表明，阴离子性质对共聚反应有明显的影响。与N-MeIM(TOF，72.5h−1，碳酸酯连接94%)相比，烷基链长较长的咪唑盐阳离子(TOF，242.5h−1，碳酸酯连接>；99%)具有更好的活性和选择性。这些结果对于进一步设计任务特定的离子液体作为有效的助催化剂来促进二氧化碳与环氧化物的共聚具有指导意义。
Imidazolium salts, most of which are room temperature ionic liquids (ILs), have been introduced as effective and tunable cocatalysts in the copolymerization of CO2with epoxides catalyzed by (salen)CrIIICl complex for the first time. Effects of imidazolium salts with different alkyl chains as well as with different anions on the copolymerization were investigated. The results showed that the copolymerization was influenced obviously by the property of anion. In addition, the cation of imidazolium salts with longer alkyl chain length such as n-dodecyl (TOF, 242.5h−1, carbonate linkages>99%) displays better activities and selectivity in the copolymerization as compared with N-MeIm (TOF, 72.5h−1, carbonate linkages 94%). These results are instructive for further design of task-specific ILs as effective cocatalysts to improve the copolymerization of CO2with epoxides.