How does the flexibility of pyrrolidinium cations affect the phase behaviour of 1-alkyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide homologues under stressful conditions?

Yoshihiro Koyama; Kiyoto Matsuishi; Takahiro Takekiyo; Hiroshi Abe; Yukihiro Yoshimura

doi:10.1039/C9CP01730E

How does the flexibility of pyrrolidinium cations affect the phase behaviour of 1-alkyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide homologues under stressful conditions?†

Yoshihiro Koyama,^a Kiyoto Matsuishi,^a Takahiro Takekiyo,^b Hiroshi Abe

^c and Yukihiro Yoshimura

*^b

Author affiliations

* Corresponding authors

^a Graduate School of Pure and Applied Science, University of Tsukuba, Ibaraki 305-8577, Japan

^b Department of Applied Chemistry, National Defense Academy, 1-10-20, Hashirimizu, Yokosuka, Kanagawa 239-8686, Japan
E-mail: muki@nda.ac.jp

^c Department of Materials Science and Engineering, National Defense Academy, 1-10-20, Hashirimizu, Yokosuka, Kanagawa 239-8686, Japan

Abstract

We conducted high-pressure Raman spectroscopy measurements on a series of 1-alkyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide ([Pyr_1n][TFSI], n = 3, 4, 6 and 8) homologues that have different alkyl chain lengths, n, at room temperature. The results showed that all [Pyr_1n][TFSI] samples formed a glassy state in which the glass transition pressure (p_g) slightly increased with an increase in n. This tendency is similar to prior results of high-pressure glass formation of [C_nmim][TFSI], although the p_gs for [Pyr_1n][TFSI] are larger than those for [C_nmim][TFSI] with corresponding n by ∼0.5 GPa. We discuss the local structural changes occurring in [Pyr_1n][TFSI] in view of the conformational changes of the Pyr⁺_1n cation and TFSI⁻ anion.

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Article information

https://doi.org/10.1039/C9CP01730E

Submitted

28 Mar 2019

Accepted

13 May 2019

First published

13 May 2019

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Phys. Chem. Chem. Phys., 2019,21, 11290-11297

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How does the flexibility of pyrrolidinium cations affect the phase behaviour of 1-alkyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide homologues under stressful conditions?

Y. Koyama, K. Matsuishi, T. Takekiyo, H. Abe and Y. Yoshimura, Phys. Chem. Chem. Phys., 2019, 21, 11290

DOI: 10.1039/C9CP01730E

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How does the flexibility of pyrrolidinium cations affect the phase behaviour of 1-alkyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide homologues under stressful conditions?†

Abstract

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Article information

How does the flexibility of pyrrolidinium cations affect the phase behaviour of 1-alkyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide homologues under stressful conditions?

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