Raman and FT IR ATR study of diethylsulfoxide/water mixtures

Abstract

The Raman and FT IR ATR spectra of diethylsulfoxide (DESO)-water mixtures in the SO and C–H stretching vibration regions at different molar ratios are considered. Noticeable changes are observed in the ν SO region, suggesting the existence of strong H-bonds between DESO and water molecules; on the contrary the ν CH bands change only in a less extent, supporting the existence of SO⋯HC hydrogen bonds in pure DESO that gradually break in the presence of water. In addition, FT IR measurements confirm the existence of ‘free’ SO group at low concentrations of DESO. The results obtained are well explainable in frame of the cluster-structure model of liquid water.