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Superpressing of a Room Temperature Ionic Liquid, 1-ethyl-3-methylimidazolium Tetrafluoroborate

Superpressing of a Room Temperature Ionic Liquid, 1-ethyl-3-methylimidazolium Tetrafluoroborate

Yukihiro Yoshimura, Hiroshi Abe, Takahiro Takekiyo, Machiko Shigemi, Nozomu Hamaya, Ryoichi Wada, Minoru Kato

J Phys Chem B. 2013 Oct 10;117(40):12296-302.

PMID: 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]).

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP143314163	1-Ethyl-3-methylimidazolium tetrafluoroborate		143314-16-3	Price

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