Dielectric absorption in dilute solutions of dibenzo-18-crown-6 in 1,4-dioxane

Abstract

Dielectric absorption of dibenzo-18-crown-6 (DB18C6) in solutions of 1,4-dioxane have been studied at 9.1 GHz frequency at three different temperatures 293.15, 303.15 and 313.15 K. A single frequency concentration variation method of Gopalkrishna was used to calculate relaxation time (τ_GK). Thermodynamical parameters, like free energy (ΔF), enthalpy (ΔH) and entropy (ΔS) of activation for the dielectric relaxation have been determined using dielectric data. Static permittivity, refractive index and density of liquid solutions are also measured at 293.15 K. Dipole moment of DB18C6 is determined using Gopalkrishna and Guggenheim’s method.