ULTRASONIC VELOCITY, PERMITTIVITY, DENSITY, VISCOSITY AND PROTON NUCLEAR-MAGNETIC-RESONANCE MEASUREMENTS OF BINARY-MIXTURES OF BENZONITRILEWITH ORGANIC-SOLVENTS

The ultrasonic velocity, permittivity, density and viscosity of binary mixtures of benzonitrile (BN) with methanol (MeOH), acetone (AC), ace tonitrile (AN), NN-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), pyridine (Py) and carbon tetrachloride (CCl4) have been measured at 2 5-degrees-C. Ultrasonic velocity measurements of BN-MeOH, BN-CCl4, BN- AN, AN-MeOH and CCl4-MeOH mixtures have also been made at 35 and 45-de grees-C. The excess permittivity (DELTAepsilon), excess viscosity (DEL TAeta) and excess isentropic compressibility (DELTAkappa(s)) for vario us systems have been calculated and examined as a function of solvent composition. The excess parameters show strong deviations from ideal b ehaviour and indicate interactions between BN and most of these organi c solvents. Mixtures of BN and DMF, however, show nearly ideal behavio ur over the entire range of composition. The nature of interaction of BN with methanol is different and more interesting than for other solv ents. BN, like CCl4 and AN, is a strong structure breaker of methanol. Proton NMR chemical shift measurements of the OH proton of methanol i n BN-MeOH mixtures confirm this observation.