1Department of Physics, Govt. College, Dera Bassi-140507, Dist. Patiala, Punjab, India.
2Department of Physics, Patiala Institute of Engineering and Technology, Sirhind Road, Patiala-147001, Punjab, India.
Intermolecular interaction studies of Trans- 4- cyano cinnamic acid ester have been done over the temperature range 340 K to 393 K, using ultrasonic velocity and density data taken from literature1. Several acoustical parameters such as adiabatic compressibility, isothermal compressibility, acoustic impedance, van der Waal's constants, molecular radius, space filling factor, surface tension, pseudo- Gruneisen parameter, Debye temperature, enthalpy and Poisson's ratio have been determined. Various thermo-dynamical parameters such as available volume, refractive index, molar refraction, Eykmann constant, internal pressure, intermolecular free length and relative association have also studied. Free Length Theory and Collision Factor Theory have been applied to predict the ultrasonic velocity values in the system. The obtained results has been explained in terms of the temperature dependence of theses parameter and the intermolecular interaction present in the system, The present investigation provide a rich source of information about the type and extent of molecular interaction occurring in the liquid crystal.
