Supramolecular structure and physicochemical properties of the mixture tetrachloromethane-methanol

The supramolecular structure and macroscopic properties over the whole concentration range and wide temperature interval of the mixture tetrachloromethane-methanol was studied. A structural model including the chainlike alcohol aggregates of various length and cyclic tetramers due to H-bonding O-H...O as well as complexes of alcohol aggregates with a solvent molecule due to H-bonding O-H...Cl was proved to describe thermodynamic excess functions (Gibbs energy, enthalpy), dielectric permittivity and Rayleigh light scattering ratios of the mixture tetrachloromethane-methanol. Thermodynamic (equilibrium constants, enthalpies and entropies of association processes) and structural parameters of the aggregates were obtained. Integral and differential parameters of aggregation in mixtures were evaluated. The long-range supramolecular ordering due to specific bonding was established. The unified analysis of the thermodynamic, dielectric and optic properties in terms of generalized quasichemical models was carried out. Supramolecular structure was found to play a significant role in determining the physicochemical properties of the mixture tetrachloromethane-methanol. (C) 2001 Elsevier Science B.V. All rights reserved.