Dielectric relaxation studies of binary mixtures of acetone and N, N-dimethylacetamide in the benzene solutions using microwave absorption data

Abstract

630-633<span style="font-size: 15.0pt;mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""="">Using standard standing wave microwave techniques and following Gopala Krishna's [Trans Faraday Soc, 33 (1957) 767] single frequency (9 .88 GHz) concentration variational method, the dielectric relaxation times (τ<span style="font-size:14.5pt;mso-bidi-font-size: 7.5pt;font-family:" arial","sans-serif""="">) <span style="font-size:15.0pt; mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""="">and the dipole moments (μ) of the binary mixtures of different molar concentrations of acetone (Ac) in binary mixtures of acetone and N,N-dimethylacetamide in benzene solutions have been calculated at different temperatures (25, 30, 35 and 40 °C. The energy parameters <span style="font-size:15.5pt;mso-bidi-font-size: 8.5pt;font-family:" times="" new="" roman","serif""="">(ΔHƐ , ΔFƐ<span style="font-size:15.5pt;mso-bidi-font-size: 8.5pt;font-family:" arial","sans-serif""="">,<span style="font-size: 15.5pt;mso-bidi-font-size:8.5pt;font-family:" times="" new="" roman","serif""=""> ΔSƐ) for the dielectric relaxation process of binary mixtures containing 50% mole fractions of Ac have been calculated, at the respective given temperatures. Comparison has been made with the corresponding energy parameters for viscous now. From the observations, it is found that the dielectric relaxation process like the viscous now process can be treated as the rate process. On the basis of above studies, solute-solvent type of the molecular association can be predicted. </span