Density, viscosity, ultrasonic speed and related acoustical parameters of symmetric double schiff bases of 1, 1’-bis (4-amino phenyl)cyclohexane in 1,4-dioxane solutions at 303.15, 308.15 and 313.15 K

The density (ρ), viscosity (η) and ultrasonic speed (U) (2MHz) of 1, 4-dioxane solutions of symmetric double Schiff bases (SB-1 and SB-2) were determined at 303.15, 308.15 and 313.15K. Various acoustical parameters such as specific acoustical impedance (Z), isentropic compressibility ( k s), Rao’s molar sound function (Rm), Vander Waals constant (b), internal pressure (π), free volume (Vf), intermolecular free path length (Lf), viscous relaxation time (τ) and classical absorption coefficient (α/f2)Cl), were determined using ρ, η and U data. The results are interpreted in terms of molecular interactions occurring in the solutions at various temperatures and concentration. Linear increase of ρ, η U, Z, Rm, b, Vf, (α/f2)Cl and τ, linear decrease of КS, Lf and π with increasing concentration of SB-1 and SB-2 supported existence of strong molecular interactions in the solutions which suggested solvophilic nature of the Schiff bases. The structure, nature and size of solute and solvent, concentration and temperature affected molecular interactions.

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