Issue 1, 2018

High-pressure glass formation of a series of 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide homologues

Abstract

We investigated the stability of the liquid phase of a series of 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([Cnmim][TFSI]) homologues with different alkyl chain lengths for 3 ≤ n ≤ 10 at room temperature. We found that all [Cnmim][TFSI] samples (n = 3–10) formed a glassy state when pressure was applied. Intriguingly, the glass transition pressure (pg) slightly increases up to n = 5, reaches a plateau at n ≧ 8, and increases again at n = 10. This is completely different from the high-pressure glass formation of [Cnmim][BF4], where the pg decreases as n increases. We discussed the local structural changes occurring in [Cnmim][TFSI] in view of the conformational changes of the cation and anion, and small-angle X-ray scattering data. It seems that [Cnmim][TFSI] is resistant to external pressure and retains its local liquid structure by conformational adjustments of the cation and anion.

Graphical abstract: High-pressure glass formation of a series of 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide homologues

Article information

Article type
Paper
Submitted
27 Sep 2017
Accepted
23 Nov 2017
First published
23 Nov 2017

Phys. Chem. Chem. Phys., 2018,20, 199-205

High-pressure glass formation of a series of 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide homologues

Y. Yoshimura, T. Takekiyo, Y. Koyama, M. Takaku, M. Yamamura, N. Kikuchi, D. Wakabayashi, N. Funamori, K. Matsuishi, H. Abe and N. Hamaya, Phys. Chem. Chem. Phys., 2018, 20, 199 DOI: 10.1039/C7CP06594A

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