Thermodynamics of mixtures containing organic carbonates. Part XV. Application of the Kirkwood-Buff theory to the study of interactions in liquid mixtures containing dialkyl carbonates and alkanes, benzene, CCl4 or 1-alkanols

摘要

Binary liquid mixtures containing a dialkyl carbonate (dimethyl or diethyl carbonate) and organic solvents such as alkanes, benzene, CCl4, or 1-alkanols were studied within the framework of the Kirkwood-Buff formalism. The Kirkwood-Buff integrals, linear coefficients of preferential solvation and local mole fractions were calculated. Results were interpreted assuming that the mixtures with alkanes or 1-alkanols are not random mixtures, which can be ascribed to the existence of strong dipolar interactions between like molecules. Systems containing benzene or CCl4 are both random and more ordered because of the charge transfer or dipole/induced dipole interactions between the polar group of the solute (O-CO-O) and the polarizable solvent molecules. The effect of increasing temperature was also examined.