Abstract

HYDROGEN BOND INTERACTION STUDY OF DMSO-WATER BINARY MIXTURES

A. D. Bokhare*, M. P. Lokhande and A. C. Kumbharkhane

Abstract

The complex permittivity spectra for Dimethylsulphoxide(DMSO)- Water mixtures, in the frequency range 10 MHz -30 GHz has been measured, over the entire concentration range using time domain reflectometry (TDR) method. The complex permittivity spectra has been fitted to the Cole –Davidson relaxation model. The least squares fit method has been used to determine the static dielectric constant(ε0), relaxation time(τ) from complex permittivity spectra in order to study hydrogen-bond interactions. The formation of hydrogen bonds between Dimethylsulphoxide(DMSO) and water has been studied by an analysis of their dielectric parameters. Luzar theoretical model is used to computeaverage number of hydrogen bond for Water–Water and Water–DMSO molecules.

Keywords: Dielectric permittivity, Relaxation time, Time domain reflectometry (TDR).