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Molecular Interactions of Binary Liquid Mixtures of Dimethylsulfoxide by Evaluation of Excess Acoustical Parameters at Different Temperatures
Ultrasonic velocity (U), density (?) and viscosity (?) have been measured for binary mixtures of Dimethylsulfoxide with Anisole, Toluene and Ethylbenzene at 293-313 K temperatures. The experimental data have been used to evaluate acoustical parameters such as adiabatic compressibility (?), free length (Lf), acoustic impedance (Z) and molar volume (Vm). Excess values of above parameters have been also evaluated, excess molar volume (VmE), excess intermolecular free length (LfE), excess adiabatic compressibility (?E) and excess acoustic impedance (ZE) at each temperature. These values are useful to understand molecular interactions of binary liquid mixtures. Positive deviations of LfE, VmE, ZE and ?E in binary systems have been attributed to dispersive forces and negative deviation is due to dipole-dipole and induced dipole interactions. Dispersive forces are operative in all systems, but since more than one type of interactions are present between the components, the excess values is the net result of all type of contributions.The binary mixture of DMSO+ANS show the large value of standard deviations of excess parameters ?E, LfE ZE, VmE. These results suggest that ANS has strong molecular interactions with DMSO than ETB and TOL. The strong molecular interaction of DMSO with ANS than ETB and TOL may attribute due to strong dipole-dipole interactions between these molecules. The greater interaction of ANS may be due to more +I effect of OCH3 group. It has been found that, molecular interactions in the binary systems of DMSO with Anisole, Ethylbenzene and Toluene follow the order of Anisole> Ethylbenzene> Toluene.
Acoustical properties Ultrasonic Technique, Dimethylsulfoxide, Anisole, Toluene, Ethylbenzene.