Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

Densities, refractive indices n, and volumetric heat capacities Cp/V have been measured at 298.15 K over the whole concentration range for the binary mixtures {1,4-dioxane + 2-pentanone, + 2-heptanone, or + cyclopentanone}. From the experimental data excess molar volumes VE, excess molar refractions RE, and excess molar isobaric heat capacities CpE were calculated. Deviations of refractive index from ideality were determined by using a deviation function defined on a volume fraction basis, n. Excess molar enthalpies HE have been measured at the same temperature for the systems {1,4-dioxane + 2-pentanone, + 2-heptanone, + cyclopentanone, or + cyclohexanone}. The discussion of these quantities is made in terms of destruction of quadrupolar order in 1,4-dioxane, setting-up of unlike-pair interactions, degrees of free volume, and influence of the size and shape of the ketone. Moreover, the results are compared with those obtained in part 2 of this series for a homologous set of systems containing tetrahydropyran.