Acoustical studies of synthesized α,β-unsaturated ketones in ethanol and different percentage composition of DMSO in ethanol

In the present investigation chalcones were synthesized by aldol condensation of acetophenone with aromatic aldehyde in basic medium and products were characterized by 1H NMR and 13C NMR spectra. These synthesized chalcones were then dissolved in pure ethanol and ethanol solutions containing 10%, 30% and 50% dimethyl sulphoxide (DMSO) to obtain binary and ternary solutions of various concentrations. Density, ρ, viscosity, η and speed of sound, u of these solutions were measured over a wide range of temperature (298.15 K to 308.15 K). Various acoustical parameters like adiabatic compressibility, intermolecular free length, acoustic impedance, relaxation time and free volume have been evaluated by using the measured values of density, viscosity and speed of sound. The obtained results are interpreted in terms of molecular interactions that give us an idea of structure-making or structure-breaking ability of solute molecules in different solvents.