Molecular Interaction Study of Binary Mixtures of THF with Methanol and o-Cresol - an Optical and Ultrasonic Study

S. Parveen, S. Singh, D. Shukla, K.P. Singh, M. Gupta and J.P. Shukla Department of Physics, University of Lucknow, Lucknow-226007, India

Received: July 10, 2009; In final form: November 10, 2009

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The refractive indices, densities and ultrasonic velocities of binary liquid mixtures of tetrahydrofuran (THF) with methanol and o-cresol over the entire composition range have been measured at 293, 303 and 313 K. Refractive index, density and ultrasonic velocity data have been used to evaluate the molar refraction deviation Δ Rm, deviation in ultrasonic velocity Δ u, excess internal pressure πiE, excess molar enthalpy HmE and excess free volume VfE. The computed results of Δ Rm, Δ u, πiE, HmE and VfE were fitted to the Redlich-Kister polynomial equation. These results suggest that specific strong interactions are taking place in THF + o-cresol mixture while dispersive forces seem to be responsible for behaviour of THF + methanol mixture. Further, experimental refractive index and density data of these mixtures were also used to test the validity of the empirical/semi empirical relations and models for refractive index and density, respectively.

DOI: 10.12693/APhysPolA.116.1011 PACS numbers: 43.35.+d, 62.60.+v, 82.60.Lf