title: Kinetic Effect on Pressure-Induced Phase Transitions of Room Temperature Ionic Liquid, 1-Ethyl-3-methylimidazolium Trifluoromethanesulfonate.
abstract: Room temperature ionic liquids (RTILs) have intriguing high-pressure phase behavior, and investigation of how pressure affects phase transitions of RTILs might yield interesting results. We here present kinetically driven phase transitions of 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([Emim][CF3SO3]) at different rates of ∼0.3 and ∼1.2 GPa/h up to ∼5 GPa. Two crystalline phases formed at ∼1.3 and ∼1.7 GPa with increasing pressure at lower compression rate of ∼0.3 GPa/h; however, the amorphous phase solidified with superpressurized glass above ∼3.3 GPa at higher compression rate of ∼1.2 GPa/h. Notably, crystal polymorphism is discussed in view of the conformational isomerism of [Emim](+) cation and an unknown cation conformer is observed. These facts indicate that kinetic effect on pressure-induced phase transitions of [Emim][CF3SO3] might be dependent on compression rate, which needs to be considered as a non-negligible factor for phase transitions of RTILs under high pressure.
authors.affiliation: School of Sciences, Wuhan University of Technology , Wuhan, Hubei 430070, China.|Center for High Pressure Science and Technology Research, Zhengzhou University of Light Industry , Zhengzhou, 450002, China.
authors.forename: Haining
authors.initials: H
authors.lastname: Li
authors.affiliation: School of Sciences, Wuhan University of Technology , Wuhan, Hubei 430070, China.|Center for High Pressure Science and Technology Research, Zhengzhou University of Light Industry , Zhengzhou, 450002, China.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Center for High Pressure Science and Technology Research, Zhengzhou University of Light Industry , Zhengzhou, 450002, China.
authors.forename: Liucheng
authors.initials: L
authors.lastname: Chen
authors.affiliation: Center for High Pressure Science and Technology Research, Zhengzhou University of Light Industry , Zhengzhou, 450002, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Wu
authors.affiliation: School of Sciences, Wuhan University of Technology , Wuhan, Hubei 430070, China.
authors.forename: Haijun
authors.initials: H
authors.lastname: Huang
authors.affiliation: Center for High Pressure Science and Technology Research, Zhengzhou University of Light Industry , Zhengzhou, 450002, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Yang
authors.affiliation: Center for High Pressure Science and Technology Research, Zhengzhou University of Light Industry , Zhengzhou, 450002, China.
authors.forename: Yongqiang
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Center for High Pressure Science and Technology Research, Zhengzhou University of Light Industry , Zhengzhou, 450002, China.|Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Su
authors.affiliation: Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, China.
authors.forename: Guoqiang
authors.initials: G
authors.lastname: Yang