Density, viscosity and speed of sound based acoustical properties of halogenated symmetric double Schiff bases of 1,1'-bis(4-aminophenyl)cyclohexane in 1,4-dioxane at 308.15 K

Department of Chemistry, Saurashtra University, Rajkot-360 005, Gujarat, India

E-mail : phparsania22@gmail.com, bj2gangani@gmail.com

Manuscript received online 24 January 2015, revised 04 February 2015, accepted 13 February 2015

The density (ρ), viscosity (ɳ) and speed of sound (U) (2 MHz) of 1,4-dioxane solutions of halogenated symmetric double Schiff bases were measured at 308.15 K. Various acoustical parameters such as specific acoustical impedance (Z), isentropic compressibility (κ_s ), Rao’s molar sound function (R_m), van der Waals constant (b), internal pressure (𝝅), free volume (V_f ), intermolecular free path length (L_f ), classical absorption coefficient (α/f ²)_Cl, and viscous relaxation time (\(\tau\)) were determined using ρ, ɳ and U data. The results were interpreted in terms of molecular interactions occurring in the solutions. Linear increase of U, Z, R_m, b, (α/f²)_Cl, τ and V_f and linear decrease of κ_s , L_f and 𝝅 with increasing concentration of Schiff bases supported existence of strong molecular interactions in the solution and solvophilic nature of the Schiff bases. The nature, size and position of halogen substituent also affected acoustical properties and hence molecular interactions.