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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

We conducted high-pressure Raman spectroscopy measurements on a series of 1-alkyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide ([Pyr1n][TFSI], n = 3, 4, 6 and 8) homologues that have different alkyl chain lengths, n, at room temperature. The results showed that all [Pyr1n][TFSI] samples formed a glassy state in which the glass transition pressure (pg) slightly increased up to n = 8. This tendency is similar to prior results of high-pressure glass formation of [Cnmim][TFSI], although the pgs for [Pyr1n][TFSI] are larger than those for [Cnmim][TFSI] with corresponding n by ~0.4 GPa. We discuss the local structural changes occurring in [Pyr1n][TFSI] in view of the conformational changes of the Pyr+1n cation and TFSI anion and X-ray scattering data.

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Publication details

The article was received on 28 Mar 2019, accepted on 13 May 2019 and first published on 13 May 2019


Article type: Paper
DOI: 10.1039/C9CP01730E
Phys. Chem. Chem. Phys., 2019, Accepted Manuscript

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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, Accepted Manuscript , DOI: 10.1039/C9CP01730E

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