Although infrared-visible sum-frequency generation (IV-SFG) vibrational spectroscopy is a powerful tool for investigating the surface and interface of various media, structural information of liquids obtained by IV-SFG has been limited to mostly those of free-surfaces or substrate/liquid interfaces. In this study, IV-SFG and molecular dynamic simulations are successfully applied to sketch the structures of the liquid/liquid interfaces of ionic liquids(ILs) ([Cnmim]X (X=PF6,TFSA, n=4~8) with polar and nonpolar solvents such as CCl4, D2O, alkane and alcohols. SF signals from the interface in C-H, C-D, O-D, S-O, and C-F stretching regions are clearly observed depending upon the nature of solvents. The changes in the position and the width of SF resonance peaks indicate the local environments of the interfaces of ILs are much different from those of the bulk IL and/or the air/IL interfaces.

Nonlinear vibrational and molecular dynamic simulation studies on ionic liquid/molecular liquid interfaces

244th National Meeting (2012)

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