Ultrasonic Speed and Related Acoustical and Thermodynamic Activation Parameters of (2E, 6eE-bis (4-Hydroxybenzylidene)-4-Methylcyclohexanone in 1, 4-Dioxane, Ethanol and Tetrahydrofuran Solutions at 298, 303, 308, and 313K

The density, viscosity and ultrasonic speed of pure solvents: 1,4-dioxane (DO), tetrahydrofuran (THF), ethanol (EtOH) and (2E, 6E)-bis (4-hydroxy benzylidene)-4-methylcyclohexanone (MBHBC) solutions of different concentrations were investigated at four different temperatures: 298, 303, 308, and 313 K to understand the effect of solvents and temperature on molecular interactions. Various acoustical and thermodynamic parameters such as acoustical impedance, adiabatic compressibility, internal pressure, free volume, inter molecular free path length, van der Waals constant, viscous relaxation time, classical absorption coefficient, Rao`s molar sound function and solvation number of MBHBC solutions were determined using density, viscosity and ultrasonic velocity data and correlated with concentration at the different temperature. Thermodynamic activation parameters such as Gibbs free energy, enthalpy and entropy were derived using viscous relaxation time data. Very good to excellent correlation between a given parameter with concentration and temperature is observed. Derived parameters supported existence of strong molecular interactions in MBHBC solutions. It is observed that MBHBC has structure forming tendency in DO, THF and EtOH systems.