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

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 (V_Φ), isentropic compressibility (K_s), limiting apparent molal isentropic compressibility (K^o_s,ɸ), A and B-viscosity coefficients from Jones-Dole equation, B/V_ɸ^o 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, K^o_s,ɸ values and B-coefficients for the electrolytes have been further split up into the contribution of individual ion (K^o_s,ɸ± and B_± values) by reference electrolyte method.