Dielectric relaxation of benzophenone and some of its derivatives in the liquid state part I: Dimethyl- and chlorobenzophenones as pure liquid and as highly concentrated solutions in nonpolar solvents

Abstract

Abstract The dynamic dielectric properties of the following liquids have been determined between 10 MHz and 36 GHz at 20 °C: 2,4-dimethylbenzophenone as pure liquid and as concentrated mixture with a nonpolar solvent; 2,5-dimethyl- and 2-chlorobenzophenone as highly concentrated solutions in nonpolar solvents. In all cases, a principal relaxation region is found at unexpectedly low frequencies (with regard to the viscosity). This can be ascribed to an anisotropy in the reorientational motion due to solute-solute interactions.