Dielectric relaxation study of m-Fluoroaniline and methanol mixture using time domain reflectometry

Abstract

The dielectric relaxation studies of liquids and liquid mixtures is a tool to understand intermolecular interaction along with molecular dynamics. Although m-Fluoroaniline (MFA) has higher dipole moment than methanol (MT) has dielectric constant less than that of methanol. H-bonds appear in methanol but not in m-Fluoroaniline. The dielectric behavior, dielectric relaxation mechanism of these pure liquids and their binary mixtures helps to understand nature of interactions between dipoles and effects of molecular bonding. Higher dielectric constant and relaxation time of of pure methanol compared to those of m-Fluoroaniline are due to presence of H-bonding and parallel alignment of electric dipoles. In pure m-Fluoroaniline spatial correlation between molecules appear only through dipole-dipole interactions. To study these aspects the Time domain Reflectometry technique has been used to obtain complex dielectric spectra of binary mixture of MT and MFA in the frequency range of 10 MHz to 10 GHz at various temperatures the results are presented.