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  • Title: Superpressing of a room temperature ionic liquid, 1-ethyl-3-methylimidazolium tetrafluoroborate.
    Author: Yoshimura Y, Abe H, Takekiyo T, Shigemi M, Hamaya N, Wada R, Kato M.
    Journal: J Phys Chem B; 2013 Oct 10; 117(40):12296-302. PubMed ID: 24020694.
    Abstract:
    We have investigated the phase behavior of 1-ethyl-3-methylimidazolium tetrafluoroborate ([emim][BF4]) at 298 K under high pressure conditions. We found that [emim][BF4] can be superpressed without crystallization up to ∼7 GPa. We propose that [emim][BF4] behaves as a superpressurized glass above 2.8 GPa. In view of the results, the environment around the alkyl-chain (C6 and C7-C8) of [emim][BF4] is largely perturbed rather than that around the imidazolium-ring in the superpressed state. We also discussed the results in view of the conformational isomerism of [emim](+) cation. Remarkably, as an alternative to pressure-induced crystallization, we have found that such a metastable liquid shows crystal polymorphism around 2.0 and 1.0 GPa upon decompression. The behavior is in contrast with the earlier results of 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]).
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