Volumetric, viscometric and optical study of molecular interactions in binary mixtures of diethyl malonate with ketones at 303.15, 308.15 and 313.15K

Abstract

Density ?, viscosity ?, and refractive index nD were measured for the binary mixtures of diethyl malonate with ketones (acetophenone, cyclopentanone, cyclohexanone and 3-pentanone) at temperatures (303.15, 308.15 and 313.15) K over the entire composition range. Excess volume VE, deviation in viscosity ??, excess Gibb?s free energy of activation for viscous flow ?GE and deviation in molar refraction ?R were determined from the experimental data and computed results were fitted to the Redlich-Kister polynomial equation. The values of VE, ??, ?GE, and ?R were plotted against the mole fraction of diethyl malonate. The observed positive and negative values of excess parameters for all the studied binary mixtures were explained on the basis of intermolecular interactions present in these mixtures. Further different empirical relations were used to correlate the binary mixture viscosities and refractive indices.