Intermolecular Interaction Studies in Organic Ternary Liquid Mixture s by Ultrasonic Velocity Measurements
Abstract The ultrasonic velocity , density and viscosity have been measured for the ternary mixtures of benzene, chlorobenzene and nitrobenzene with N-N dimethylformamide (DMF) in cyclohexane at 303K. The experimental data have been used to calculate the acoustical parameters namely adiabatic compressibility ( β ), free length (L f ), free volume (V f ), internal pressure ( π i ),viscous relaxation time ( τ ), Gibbs’ Free Energy ( ∆ G*) and acoustic impedance (Z). The excess values of some the above parameters are also evaluated and discussed in the light of molecular interaction in the mixtures. It is observed that a weak molecular interaction prevailing in the present systems of the mixtures. Such interactions are primarily due to weak dipole-dipole and dipole- induced dipole types. Dispersive forces are also found to e xist between the components of the mixtures.