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Combined Raman Scattering and X-ray Diffraction Study of Phase Transition of the Ionic Liquid [BMIM][TFSI] Under High Pressure

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Abstract

In situ solidification of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIM][TFSI]) from melt has been investigated by using a diamond anvil cell under pressures up to about 6.0 GPa at room temperature. The results indicate that non-monotonic pressure induced Raman shifts and variation of the full width at half-maximum are suggestive of a phase transition at about 1.8 GPa upon compression, which was further confirmed to be a phase transition from liquid to a superpressurized glass by line broadening measurements of the sharp R 1 ruby fluorescence line and synchrotron X-ray diffraction measurements. The conformational changes of C 1 and C 2 conformers of the [TFSI] anion under high pressure are discussed; the C 2 conformers are predominant under high pressures. In addition, the Raman spectra of [BMIM][TFSI] under different conditions are compared in detail. The results show that the structure of the glassy state at low temperature is different from that of the high pressure state, while the glassy state is mainly composed of C 2 anion conformers, which is similar to the high pressure state.

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Acknowledgments

This work is supported by the National Science Foundation of China (Nos. 21273206 and 31201377), as well as Key Research Project of Higher Education of Henan Province (No. 15A140016 and No. 2010GGJS-110).

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Authors and Affiliations

  1. The High Pressure Research Center of Science and Technology, Zhengzhou University of Light Industry, Zhengzhou, 450002, China

    Jie Wu, Xiang Zhu, Haining Li, Lei Su, Kun Yang & Xuerui Cheng

  2. Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, China

    Lei Su & Guoqiang Yang

  3. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100039, China

    Jing Liu

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  1. Jie Wu
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  2. Xiang Zhu
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  3. Haining Li
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  4. Lei Su
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  6. Xuerui Cheng
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Correspondence to Lei Su.

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Wu, J., Zhu, X., Li, H. et al. Combined Raman Scattering and X-ray Diffraction Study of Phase Transition of the Ionic Liquid [BMIM][TFSI] Under High Pressure. J Solution Chem 44, 2106–2116 (2015). https://doi.org/10.1007/s10953-015-0393-2

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  • DOI: https://doi.org/10.1007/s10953-015-0393-2

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