Thermodynamic behaviour of mixtures. Part 2.—Mixtures of acetonitrile with β-picoline, γ-picoline, 2,6-lutidine, isoquinoline and benzene at 25 °C

Abstract

Ultrasonic velocities (u), densities (ρ), static relative permittivities (Iµ) and refractive indices (nD) of mixtures of acetonitrile (AN) with β-picoline, γ-picoline, 2,6-lutidine, isoquinoline and benzene have been measured over the entire composition range at 25 °C. Intermolecular interaction parameters, such as the molar sound velocity (um) and the solvation number of the co-solvent (Nc) have been calculated for all the binary mixtures. The partial molar volumes (text-decoration:overlineV0) and the partial isentropic compressibilities (text-decoration:overlineκ0S) at infinite dilution have been calculated for all the co-solvents as well as for AN. Excess properties, such as the excess isentropic compressibility (κES), volume (VE), relative permittivity (ΔIµ), molar polarisation (PE) and molar refraction (RE) have also been computed for these binary mixtures. Weak specific interactions are present between the components of AN–β-picoline and AN–γ-picoline in comparison to all other AN–base mixtures.