期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 107, 期 25, 页码 6148-6152出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp027753n
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Sum frequency generation vibrational spectroscopy was used to determine the orientation of the cations in a room-temperature ionic liquid at the air-liquid interface. The ionic liquid that was studied was 1-butyl-3-methylimidazolium bis-trifluoromethylsulfonimide, [BMIM](+)[imide](-). The orientation of the cation, [BMIM]I, was studied as a function of water pressure in the vapor over the range of 10(-5) to 200 Torr. At water pressures below 10(-4) Torr, the imidazolium ring was oriented parallel to the surface plane. On increasing the water pressure to greater than 10(-4) Torr, the imidazolium ring tipped up from the surface with an angle along the surface normal of 40-55degrees. No water signal was observed in the spectra obtained at the water pressures studied here.
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