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Open AccessArticle

Epoxy-Containing Ionic Liquids with Tunable Functionality

Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
Authors to whom correspondence should be addressed.
Academic Editors: Po-Yu Chen, Jing-Fang Huang and Yen-Ho Chu
Molecules 2019, 24(14), 2591;
Received: 26 June 2019 / Revised: 12 July 2019 / Accepted: 14 July 2019 / Published: 17 July 2019
(This article belongs to the Special Issue Ionic Liquids for Chemical and Biochemical Applications II)
New types of ionic liquids (ILs) with an epoxy group on a piperidinium-type cation were successfully synthesized by the simple anion exchange reaction of a solid 1-allyl-1-(oxiran-2-ylmethyl)piperidinium bromide, which was designed in this study. Unfortunately, the physicochemical properties, e.g., viscosity and ionic conductivity, of the ILs were inferior to those of common ILs such as 1-ethyl-3-methylimidazolium tetrafluoroborate ([C2mim][BF4]) and 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide ([C4mim][Tf2N]). However, the resulting ILs are of great interest as reaction intermediates: For example, the epoxy group on the cation could react with various reagents, including CO2. Consequently, the modification of the cation structure in the ILs was possible. This is particularly interesting because it is very difficult to modify commonly used ILs. The approach established in this article will provide a favorable synthetic route for creating novel functional ILs in the future. View Full-Text
Keywords: ionic liquid; epoxy group; physicochemical property; carbon dioxide; functionality change ionic liquid; epoxy group; physicochemical property; carbon dioxide; functionality change
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MDPI and ACS Style

Tsuda, T.; Iwasaki, K.; Kumagai, K.; Kuwabata, S. Epoxy-Containing Ionic Liquids with Tunable Functionality. Molecules 2019, 24, 2591.

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