ACETONITRYLE - WATER BINARY-MIXTURES AND THEIR ASSUMED INTERNAL STRUCTURES

The H-1-NMR spectra of liquid binary mixtures, acetonitryle (ACN) - wa ter (H2O), were recorded at 298 K and the spectral parameters, Delta d elta(ACN-H2O) were evaluated. The surface tensions (sigma(12)) were me asured at 298.15 K. From literature values of density (d(12)), viscosi ty (eta(12)), relative permittivities (epsilon(12)) and measured surfa ce tensions the values of molar volumes (V-12) and their deviations fr om ''ideality'' were calculated. Further on the temperature coefficien ts of relative permittivity, alpha(12) = (1/epsilon(12)).[d epsilon(12 )/d(1/T)], were evaluated. These structural parameters as functions of concentration suggest the formation of the intermolecular ''complexes '' of the ACN . 2H(2)O, ACN . H2O, 2 ACN . 3H(2)O and 2 ACN . 3 H2O ty pes.