Ionic liquids containing the urea moiety for recognition of halides and complex anions  

作　　者：DONG ZhiYun YANG Yu ZHANG LiFeng XUE YunRong FENG MeiYun GAO GuoHua 

机构地区：[1]Shanghai Key Laboratory of Green Chemistry and Chemical Processes,Department of Chemistry,East China Normal University,Shanghai200062,China

出　　处：《Chinese Science Bulletin》2012年第5期473-478,共6页

基　　金：supported by the National Natural Science Foundation of China (20873041 and 21072061);Shanghai Leading Academic Discipline Project (B409)

摘　　要：A series of novel imidazolium based ionic liquids containing the urea moiety were designed and synthesized for anion recognition. 1-Ethylurea-3-methylimidazolium acetate ([Eumim]OAc) was used as the receptor for the halides and complex anions (BF4-, PF6-, BPh4-). 1H NMR spectra showed that the urea protons and imidazolium C(2) proton of the receptor ([Eumim]OAc) moved upfield on addition of various anions. A Job plot showed that the [Eumim]OAc receptor formed a 1:1 complex with BPh4-. X-ray diffraction analysis and the molecular modeling study revealed that the conformations of [Eumim]OAc and [Eumim]BPh4 were different. The conformational change of the cation was caused by anion exchange, and may provide an alternative to current methods for recognition of anions.A series of novel imidazolium based ionic liquids containing the urea moiety were designed and synthesized for anion recognition. 1-Ethylurea-3-methylimidazolium acetate （[Eumim]OAc） was used as the receptor for the halides and complex anions （BF4^-, PF6^-, BPh4^-）.^ 1H NMR spectra showed that the urea protons and imidazolium C（2） proton of the receptor （[Eumim]OAc） moved upfield on addition of various anions. A Job plot showed that the [Eumim]OAc receptor formed a 1 ： 1 complex with BPh4^-. X-ray diffrac- tion analysis and the molecular modeling study revealed that the conformations of [Eumim]OAc and [Eumim]BPh4 were different. The conformational change of the cation was caused by anion exchange, and may provide an alternative to current methods for recognition of anions.

关 键 词：阴离子识别 离子液体 卤化物 尿素 成分 X射线衍射分析 质子受体 构象变化 

分 类 号：O641.3[理学—物理化学] O646.1[理学—化学]