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

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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

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Publication details

The article was received on 27 Sep 2017, accepted on 23 Nov 2017 and first published on 23 Nov 2017


Article type: Paper
DOI: 10.1039/C7CP06594A
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
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    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, Advance Article , DOI: 10.1039/C7CP06594A

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