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Alkaline Stable C2-Substituted Imidazolium-Based Anion-Exchange Membranes
Abstract
The alkaline stability of imidazolium salts and imidazolium-based alkaline anion-exchange membranes (AEMs) was investigated in this work. C2-substituted (with methyl, isopropyl or phenyl groups) imidazolium salts, 3-ethyl-1,2-dimethyl imidazolium bromine ([EDMIm][Br]), 3-ethyl-2-isopropyl-1-methylimidazolium bromine ([EIMIm][Br]), and 3-ethyl-1-methyl-2-phenyl- imidazolium bromine ([EMPhIm][Br]), were synthesized and characterized. The effect of the C2-substitution on the alkaline stability of imidazolium salts was investigated by 1 H and 13 C NMR spectroscopy. Compared with the C2-unsubstituted imidazolium salt, 3-ethyl-1-methylimidazolium bromine ([EMIm][Br]), the alkaline stability of C2-substituted imidazolium salts is significantly enhanced at elevated temperatures, probably due to the steric hindrance of the substituents, which protected the imidazolium cations against the hydroxide attack. Moreover, the higher LUMO energies may also improve the alkaline stability of imidazolium salts. The alkaline stability of C2-substituted imidazolium salts was found to be in the order [EDMIm][Br] > [EIMIm][Br] > [EMPhIm][Br]. This work provides a feasible approach for enhancing the chemical stability of C2-substituted imidazolium salts, which has potential applications for alkaline anion-exchange membranes.
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Metadata
- Authors
- Lin, B., Dong, H., Li, Y., Si, Z., Gu, F., & Yan, F.
- Venue
- Chemistry of Materials
- Publisher
- American Chemical Society (ACS)
- Published
- 2013-04-12
- Volume
- 25
- Issue
- 9
- Pages
- 1858-1867
- ISSN
- 0897-4756 (ISSN-L)
- 1520-5002
- OpenAlex
- W2312588036
- Cited by
- 307
- References
- 2
- FWCI
- 18.77
- Type
- journal article
- Language
- en
- Open access
- closed
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- Lin, B., Dong, H., Li, Y., Si, Z., Gu, F., & Yan, F. (2013). Alkaline Stable C2-Substituted Imidazolium-Based Anion-Exchange Membranes. Chemistry of Materials. https://doi.org/10.1021/cm400468u
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