Abstract
Room temperature ionic liquids having 1-butyl-3-methylimidazolium ([BMIM]) cations and three different anions ([BMIM][PF6], [BMIM][BF4], [BMIM]Br) were studied by using Optical Heterodyne Detected-Optical Kerr Effect (OHD-OKE) spectroscopy to find out the effect of the anion size on the intermolecular dynamics. Fourier transformation of the time-domain OHD-OKE signals yielded a broad band in the spectra below 150cm−1. The modes with frequencies around 15, 80 and 100cm−1 used to fit the spectra all shifted to higher frequencies with the decrease in the anion size due to changes in the intermolecular force and the reduced mass.
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