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Volume 154, 2012
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Nonlinear vibrational spectroscopic studies on water/ionic liquid([Cnmim]TFSA: n = 4, 8) interfaces

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Abstract

The interfaces of water/room temperature ionic liquids (RTIL) (1-alkyl-3-methyl imidazolium bis(trifluoromethylsulfonyl)amide ([Cnmim]TFSA): n = 4, 8) are investigated by infrared-visible sum frequency generation (IV-SFG) vibrational spectroscopy and molecular dynamics (MD) simulation. SFG spectra taken within the SO stretch region drastically differ between air/RTIL and water/RTIL interfaces. When a RTIL surface is in contact with water, a broadened and blue-shifted SO2-ss mode peak is observed in the SFG spectra, indicating an inhomogeneous intermolecular interaction due to hydrogen bonding of the [TFSA] anions and water molecules at the water/[Cnmim]TFSA interface. MD simulations show the SO2 groups of the anion are preferentially orientated toward the water phase, which is consistent with the SFG spectral features. Polar orientation of the [TFSA] anion originates from the ordered structure of the alkyl chains of [Cnmim]+ cations.

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Article information


Submitted
08 Apr 2011
Accepted
01 Jun 2011
First published
20 Sep 2011

Faraday Discuss., 2012,154, 289-301
Article type
Paper

Nonlinear vibrational spectroscopic studies on water/ionic liquid([Cnmim]TFSA: n = 4, 8) interfaces

T. Iwahashi, Y. Sakai, D. Kim, T. Ishiyama, A. Morita and Y. Ouchi, Faraday Discuss., 2012, 154, 289
DOI: 10.1039/C1FD00061F

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