Study of molecular interaction in ternary mixture of acetylacetone (HAA) with (benzene plus p-xylene)-linear correlation factor, excess molar polarization and excess Gibb's free energy of mixing

The relative permittivity in the ternary mixtures of acetylacetone with (benzene +p-xylene) has been measured at 303.16 K and frequency 455 kHz. The Kirkwood-Frohlich linear correlation factor (g), excess molar polarization (DeltaP) and excess Gibb's free energy (DeltaG) of mixing in these mixtures are calculated using the experimental value of relative permittivity on the basis of Winkelmann-Quitzsch equation. These parameters are found to be mole fraction-dependent indicating existence of angular correlation between the polar molecules in the nonpolar solvent. The study reveals that the nonpolar solvent benzene is dominant over p-xylene in the mixtures. The Redlich-Kister relation is used to estimate the ternary interaction parameters, which are in satisfactory agreement with the experimental data. (C) 2003 Elsevier B.V. All rights reserved.