Journal of Pure and Applied Ultrasonics

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Ultrasonic Speed and Associated Thermodynamic and Acoustical Parameters of(2E, 6E)-2, 6-Bis (4-hydroxybenzylidene) Cyclohexanone Solutions at Four Different Temperatures


Affiliations
1 Department of Chemistry, Saurashtra University, Rajkot-360005, India
 

The density (ρ), viscosity (η) and ultrasonic speed (U) of the pure solvents: EtOH, 1, 4-dioxane (DO), tetra hydrofuran (THF) and (2E, 6E)-2, 6-bis (4-hydroxybenzylidene) cyclohexanone (BHBC) solutions were investigated at four temperatures: 298, 303, 308 and 313 K over a wide range of concentrations (0.02-0.002 mol dm–3) to understand molecular interactions in these solutions. Various acoustical and thermodynamic activation parameters such as specific acoustical impedance (Z), adiabatic compressibility (κa), Rao's molar sound function (Rm), van der Waals constant (b), internal pressure (π), free volume (Vf), intermolecular free path length (Lf), classical absorption coefficient [(α/f2)cl], viscous relaxation time (τ), Gibbs free energy of activation (ΔG*), enthalpy of activation (ΔH*) and entropy of activation (ΔS*) were determined using ρ, η and U data and correlated with concentration at different temperatures. Very good to excellent correlation between a given parameter and concentration (C) is observed at all temperatures and solvent systems studied. A linear increase or decrease of acoustical and thermodynamic parameters with concentration and temperature confirmed the presence of strong molecular interactions in the solutions and further confirmed by positive and nonlinear variation of solvation number with C and T. All the derived parameters are interpreted in light of the nature and the structure of the solvents and solute.
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  • Ultrasonic Speed and Associated Thermodynamic and Acoustical Parameters of(2E, 6E)-2, 6-Bis (4-hydroxybenzylidene) Cyclohexanone Solutions at Four Different Temperatures

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Authors

Parsotm H. Parsania
Department of Chemistry, Saurashtra University, Rajkot-360005, India
Dharmesh B. Sankhavara
Department of Chemistry, Saurashtra University, Rajkot-360005, India
Jalpa Chopda
Department of Chemistry, Saurashtra University, Rajkot-360005, India
Jignesh P. Patel
Department of Chemistry, Saurashtra University, Rajkot-360005, India

Abstract


The density (ρ), viscosity (η) and ultrasonic speed (U) of the pure solvents: EtOH, 1, 4-dioxane (DO), tetra hydrofuran (THF) and (2E, 6E)-2, 6-bis (4-hydroxybenzylidene) cyclohexanone (BHBC) solutions were investigated at four temperatures: 298, 303, 308 and 313 K over a wide range of concentrations (0.02-0.002 mol dm–3) to understand molecular interactions in these solutions. Various acoustical and thermodynamic activation parameters such as specific acoustical impedance (Z), adiabatic compressibility (κa), Rao's molar sound function (Rm), van der Waals constant (b), internal pressure (π), free volume (Vf), intermolecular free path length (Lf), classical absorption coefficient [(α/f2)cl], viscous relaxation time (τ), Gibbs free energy of activation (ΔG*), enthalpy of activation (ΔH*) and entropy of activation (ΔS*) were determined using ρ, η and U data and correlated with concentration at different temperatures. Very good to excellent correlation between a given parameter and concentration (C) is observed at all temperatures and solvent systems studied. A linear increase or decrease of acoustical and thermodynamic parameters with concentration and temperature confirmed the presence of strong molecular interactions in the solutions and further confirmed by positive and nonlinear variation of solvation number with C and T. All the derived parameters are interpreted in light of the nature and the structure of the solvents and solute.

References