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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Dong, Z., Yang, Y., Zhang, L. et al. Ionic liquids containing the urea moiety for recognition of halides and complex anions. Chin. Sci. Bull. 57, 473–478 (2012). https://doi.org/10.1007/s11434-011-4722-6
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DOI: https://doi.org/10.1007/s11434-011-4722-6