Acoustic and volumetric investigations in aromatic, cyclic and aliphatic ketones with dimethyl sulphoxide at 308.15K

Ultrasonic velocities, u, and densities, rho, of binary liquid mixtures of dimethyl sulphoxide (DMSO) with ketones such as acetophenone (AP), cyclohexanone (CH), and 3-pentanone (3P), including pure liquids, over the entire composition range have been measured at 308.15 K. Using the experimental data, deviation in ultrasonic velocity, Delta u, deviation in isentropic compressibility, Delta k(s), excess molar volume, V-m(E), excess intermolecular free length, L-f(E) and excess acoustic impedance, Z(E), partial molar volumes, (V) over bar (m,1), (V) over bar (m,2), and excess partial molar volumes, (V) over bar (E)(m,1), (V) over bar (E)(m,2) have been calculated. Molecular interactions in the systems have been studied in the light of variation of excess/deviation values of calculated properties and these properties have been fitted to RedlichKister type polynomial equation. The observed positive values of V-m(E), Delta k(s), L-f(E) and negative values of Delta u, Z(E) for all the binary liquid mixtures studied clearly indicate the presence of the dominance of weak physical interactions between the components of molecules. Further, FTIR spectra support the conclusions drawn from deviation/excess properties. Moreover, theoretical values of ultrasonic velocity in the mixtures have been evaluated using various theories and such values were compared with experimental velocities to verify the applicability of such theories to the systems investigated. (C) 2015 The Authors. Published by Elsevier B.V.