Dielectric relaxation study of some substituted anilines in benzene solutions at different temperatures

Abstract

Abstract Measurements of static dielectric constant at 300 KHz, refractive index (for sodium D-line) and complex dielectric constant at 9.945 GHz (X-band) have been made for 2-chloro-6-methyl-aniline, 3-chloro-2-methyl-aniline, 3-chloro-4-methyl-aniline, 4-chllro-2 methyl-aniline and 5-chloro-2-methyl-aniline in dilute solutions of benzene over a temperature range 25–55°C. Dielectric relaxation times τ(1) and τ(2) have been calculated by the method suggested by Higasi, Koga and Nakamura in terms of slopes ao, a′, a″ and aD. It is remarked that τ(2) at the experimental frequency of 9.945 GHz leads to τ1, the relaxation time for over all rotation, whereas τ(1), becomes an explicit function of τ1 and τ2. The results for τ(2) shows a systematic decrease with increase in temperature whereas for τ(1) there seems to be no observable trend. The energy parameters and the factors A′ and B′ have been determined from the Eyring's rate equations. It is observed that Kalman's formula satisfactorily explains the relation between the dielectric relaxation time and the viscosity.