The density (ρ), viscosity (η) and ultrasonic speed (U) (2MHz) of DMF solutions of halogenated symmetric double Schiff bases were determined at 308.15K. Various acoustical parameters such as specific acoustical impedance (Z), adiabatic compressibility (??ša), Rao’s molar sound function (Rm), Vander Waals constant (b), internal pressure (π), free volume (Vf), intermolecular free pathlength (Lf), classical absorption coefficient (α/f2)Cl), and viscous relaxation time (τ)were determined using ρ, η and U data. Linear increase of U, Z, R, b, Vf, (α/f2)Cl and τ, and linear decrease of ??ša, Lf and π with increasing concentration of Schiff bases supported solvophilic nature of the Schiff bases and further supplemented by solvation number. The position and nature of substituent also affected molecular interactions.
