Dielectric study of allyl bromide and formamide mixtures using picoseconds time domain reflectometry

Dielectric study of allyl bromide, formamide and their binary mixtures have been carried out over the frequency range from 10 MHz to 20 GHz at temperatures 288 K, 298 K, 308 K and 318 K using Time Domain Reflectometry (TDR) for 11 different concentrations. Static dielectric constant, relaxation time, Kirkwood correlation factor, Excess parameters were estimated information regarding the molecular structure and dynamics of the mixture are also discussed. The values of static dielectric constant and relaxation time increases with increase in concentration of formamide in allyl bromide. The Bruggeman plots show a non-linearity of the curves for all the concentrations and all temperatures indicating the heterointeraction which may be due to hydrogen bonding of the -NH₂ group of formamide with C-Br group of allyl bromide. The excess inverse relaxation time values are negative for all the concentrations and all temperatures indicating that the solute-solvent interaction hinders the rotation of the dipoles of the system. Kirkwood correlation factor increases as the concentration of formamide increases which confirms the intermolecular interaction through hydrogen bonding in the system.