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- Title
Solidification and Conformation of Ionic Liquid 1-Ethyl-3-Methylimidazolium Trifluoroacetate under High Pressure.
- Authors
Haining Li; Yu Lin
- Abstract
The structural dynamics and phase behavior of 1-ethyl-3-methylimidazolium trifluoroacetate ([Emim][CF3AcO]) under elevated pressure conditions were meticulously examined. Utilizing a diamond-anvil cell (DAC) in conjunction with Raman spectroscopy and synchrotron radiation X-ray diffraction, investigations were conducted at ambient temperature. Synchrotron radiation X-ray diffraction spectra revealed the absence of crystallization in the samples at pressures up to 5 GPa. A detailed analysis of the Raman spectra elucidated the relationships between Raman shift and full width at half maxima (FWHM) of characteristic Raman peaks as a function of pressure. A notable discontinuity was observed around 2.8 GPa, suggestive of a potential phase transition at this threshold. The hydrostatic properties of [Emim][CF3AcO] were further elucidated through analysis based on the ruby fluorescence peak under high-pressure conditions. These findings indicate a pressure-induced transition of [Emim][CF3AcO] at approximately 2.8 GPa, transitioning from a liquid state to a superpressurized glass. In addition, the conformational equilibrium of [Emim][CF3AcO] under such high-pressure environments was meticulously analyzed. The study revealed the coexistence of two conformers, namely planar and nonplanar, under high-pressure conditions. It was observed that the population of planar conformers escalates with increasing pressure, attributable to their reduced conformational volume. This research provides novel insights into the high-pressure behavior of imidazolium-based ILs, contributing significantly to the understanding of their phase transitions and conformational dynamics under extreme conditions.
- Subjects
PHASE transitions; IONIC liquids; SOLIDIFICATION; TRIFLUOROACETIC acid; SYNCHROTRON radiation; HYDROSTATIC extrusion
- Publication
International Journal of Heat & Technology, 2023, Vol 41, Issue 6, p1639
- ISSN
0392-8764
- Publication type
Article
- DOI
10.18280/ijht.410627