Ionic liquids containing the urea moiety for recognition of halides and complex anions |
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| Authors: | ZhiYun Dong Yu Yang LiFeng Zhang YunRong Xue MeiYun Feng GuoHua Gao |
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| Institution: | Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, Shanghai200062, China |
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| Abstract: | 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. |
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| Keywords: | ionic liquids anion recognition anion exchange conformation complex anions |
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