Abstract
In situ Raman spectroscopic analysis has been performed for room temperature ionic liquid (RTIL) + CO2 systems under two-phase equilibrium conditions at room temperature. The Raman spectra indicate the followings: the vibration state and configuration of 1-ethyl-3-methylimidazolium tetrafluoroborate change by CO2 dissolution; the liquid structure of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide barely changes by addition of CO2 pressure up to 30 MPa. In addition, the information of the RTIL structure suggests that the large change of the vibration state and configuration of the RTIL does not necessarily relate to the high CO2 solubility in the RTIL.
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