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High pressure Raman study on the local structure of 1-ethyl-3-methylimidazolium tetrafluoroborate
Authors:Takahiro Takekiyo  Naohiro Hatano  Hiroshi Abe  Yukihiro Yoshimura
Institution:1. Department of Applied Chemistry, National Defense Academy , 1-10-20, Hashirimizu, Yokosuka , 239-8686 , Japan take214@nda.ac.jp;3. Department of Applied Chemistry, National Defense Academy , 1-10-20, Hashirimizu, Yokosuka , 239-8686 , Japan;4. Department of Materials Science and Engineering, National Defense Academy , 1-10-20, Hashirimizu, Yokosuka , 239-8686 , Japan
Abstract:We have investigated the pressure-induced Raman spectral changes of 1-ethyl-3-methylimidazolium tetrafluoroborate (emim]BF4]). We found that emim]BF4] did not crystallize up to 1.2 GPa. The Raman CH stretching spectra arising from the CH3 groups of the ethyl-chain and the CH3 group adjacent to the imidazolium-ring in emim]+ cation largely changed against pressure. Moreover, the Raman intensity of the CH2 (N) bending band arising from the alkyl-chain drastically changes with increasing pressure, but that of the imidazolium-ring in-plane bending band arising from the imidazolium-ring is independent of pressure. Our results show that the environment around the alkyl-chain of emim]BF4] is largely perturbed rather than that around the imidazolium-ring upon compression.
Keywords:ionic liquids  Raman spectroscopy  phase behavior  diamond anvil cell
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