Bhavin. B. Dhaduk, Parsotam H. Parsania, Thermo-Acoustical Study of Biologically Active 1,1’-Bis(3-Methyl-4-Carboxyethylphenoxy) Cyclohexane at Four Different Temperatures, ILCPA Volume 47, International Letters of Chemistry, Physics and Astronomy (Volume 47)
https://www.scipress.com/ILCPA.47.1
Abstract:
    Density (<i>ρ</i>), viscosity (<i>η)</i>, ultrasonic speed (<i>U</i>), and thermo-acoustical parameters such as specific acoustical impedance <i>(Z), </i>adiabatic compressibility (<i>κ</i><i><sub>a</sub></i>), internal pressure (<i>π</i>), free volume (<i>V</i><i><sub>f</sub></i>), inter molecular free path length (<i>L</i><i><sub>f</sub></i>), Van der Waals constant (<i>b</i>), viscous relaxation time (<i>τ</i>), classical absorption coefficient <i>(α/f</i><i><sup>2</sup></i><i>)</i><i><sub>cl</sub></i>, Rao’s molar sound function (<i>R</i><i><sub>m</sub></i>), solvation number (<i>S</i><i><sub>n</sub></i>), Gibbs free energy of activation <i>(ΔG*</i>), enthalpy of activation (<i>ΔH*</i>) and entropy of activation (<i>ΔS*</i>) of biologically active 1,1’-bis (3-methyl-4-carboxyethylphenoxy) cyclohexane (BMCPC) in 1,4-dioxane (DO), ethyl acetate (EA), tetrahydrofuran (THF) have been studied at four different temperatures: 298, 303, 308 and 313 K to understand the molecular interactions in the solutions. A good to excellent correlation between a given parameter and concentration is observed at all temperatures and solvent systems studied. Linear increase or decrease [except (<i>α/f</i><i><sup>2</sup></i>)<i><sub>cl</sub></i> ] of acoustical parameters with concentration and temperature indicated the existence of strong molecular interactions. <i>ΔG*</i> decreased linearly with increasing concentration and temperature in DO and EA systems and increased with temperature in THF system. <i>ΔH*</i> and <i>ΔS*</i> are found practically concentration independent in case of DO and EA system but both are found concentration dependent in THF system.
Keywords:
    Acoustical Parameters, Thermodynamic Parameters, Ultrasonic Speed