T. Umecky, Mitsutoshi Abe, T. Takamuku
May 1, 2019
Citations
0
Influential Citations
10
Citations
Journal
Journal of CO2 Utilization
Abstract
Abstract Basic 2,4-pentanedionate anion is one of candidates for task-specific ionic liquids as CO2 chemical absorbents. However, there have been few reports on not only CO2 absorption but also physicochemical properties of 2,4-pentanedionate ionic liquids. In this study, we prepared 1-ethyl-3-methylimidazolium ionic liquids with 2,4-pentanedionate and its fluorine derivatives, i.e., 1-ethyl-3-methylimidazolium 2,4-pentanedionate ([C2mim][acac]), 1-ethyl-3-methylimidazolium 1,1,1-trifluoro-2,4-pentanedionate ([C2mim][tfacac]), and 1-ethyl-3-methylimidazolium 1,1,1,5,5,5-hexafluoro-2,4-pentanedionate ([C2mim][hfacac]). A comparison of 1H NMR spectra among the above and three conventional ionic liquids, 1-ethyl-3-methylimidazolium acetate ([C2mim][AcO]), 1-ethyl-3-methylimidazolium 2,2,2-trifluoroacetate ([C2mim][TFA]), and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C2mim][Tf2N]), showed that the hydrogen atom at the 2-position of [C2mim]+ cation (H2c) interacts with the anions, and the strength of the interaction increases in the order of [Tf2N]–