Dielectric properties of liquid systems: study of interactions in the systems carbon tetrachloride with benzene, toluene, and p-xylene

Adrian Buep
2014 ScienceOpen Research  
Intermolecular associations in liquid systems of non-polar and slightly polar compounds were studied through excess molar volumes (V E M ), and excess dielectric properties (e E and n 2 E D ) for mixtures of carbon tetrachloride (CCl 4 ) with benzene (C 6 H 6 ), toluene (C 6 H 5 CH 3 ), and p-xylene (p À ðCH 3 Þ 2 C 6 H 4 ). These excess properties were calculated from measurements of density (q), static permittivity (e), and refractive index (n D ) over the whole range of concentrations, at
more » ... ncentrations, at 298.15 K. The values of the excess dielectric properties for these mixtures were fitted in two different ways, one through least squares using the Redlich-Kister equation and the other using a model developed to explain deviations from ideality. The first fit was found to be descriptive while the second gave the equilibrium constant values for the interaction products actually formed in the mixtures and the respective electronic polarizabilities and dipole moments, indicating the existence of interaction products. EXPERIMENTAL SECTION Materials Reaction grade compounds were fractionally distilled twice and kept in dark bottles, under dry nitrogen. Benzene, toluene, and p-xylene were refluxed over metallic sodium. Purity was better than 99.9 mol% through gas phase chromatography. In all distillations only the middle fraction coming over at the reported boiling point and comprising about 70% was SOR-PHYS SOR-PHYS Adrián H. Buep: Dielectric properties of liquid systems: study of interactions in the systems carbon tetrachloride
doi:10.14293/s2199-1006.1.sor-phys.avbrmv.v1 fatcat:mim4wosp25bjjh2zkytbntjxym