Insight into molecular interactions and solvation properties of methylammonium perchlorate in acetonitrile-dimethylsulfoxide binary mixtures: Compressibility, viscometric and dissolution thermodynamic studies

Abstract

Densities (ρ), ultrasonic velocities (u) and viscosities (ƞ) of Methylammonium perchlorate (CH3NH3ClO4) in binary solvent mixtures of Acetonitrile (AN) and Dimethylsulfoxide (DMSO) containing 0.0, 0.20, 0.40, 0.60, 0.80 and 1.0 ​mol fraction of DMSO at various temperatures ranging from 298K–328K at atmospheric pressure, have been measured. From the experimental data important parameters, namely, apparent molal volume (VΦ), isentropic compressibility (Ks), limiting apparent molal isentropic compressibility (Kos,ɸ), A and B-viscosity coefficients from Jones-Dole equation, B/Vɸo values and viscous flow related thermodynamic properties have been derived. Interpretation of the obtained thermodynamic parameters was done with regards to solute-solvent and solute-solute interactions and structure breaking and making potential of the solutes in solution. To evaluate the extent of preferential solvation, Kos,ɸ values and B-coefficients for the electrolytes have been further split up into the contribution of individual ion (Kos,ɸ± and B± values) by reference electrolyte method.