Journal of Chemical and Pharmaceutical Research (ISSN : 0975-7384)

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Original Articles: 2010 Vol: 2 Issue: 1

Intermolecular Interaction Studies in Organic Ternary Liquid Mixtures 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 di methylformamide (DMF) in cyclohexane at 303K. The experimental data have been used to ca lculate 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 o f some the above parameters are also evaluated and di scussed in the light of molecular interaction in the mixtures. It is observed that a weak molecul ar interaction prevailing in the present systems of the mixtures. Such interactions are primarily du e to weak dipole-dipole and dipole- induced dipole types. Dispersive forces are also found to e xist between the components of the mixtures.