Viscosity–Composition Properties of Glycine and L-Alanine Solutions in Aqueous Solutions of Tributylmethylphosphonium Methylsulfate Ionic Liquid at 303–333 K

Abstract

Densities and viscosities of glycine and L-alanine solutions in aqueous solutions of tributylmethylphosphonium methylsulfate were measured at 303–333 K under atmospheric pressure. These data were used to calculate apparent molar volume ( $${{\phi }_{V}}$$ ), standard partial molar volume ( $$\phi _{V}^{0}$$ ), standard isobaric partial molar expansibility ( $$\phi _{E}^{0}$$ ) and its temperature dependence, the viscosity B-coefficient and solvation number ( $${{S}_{n}}$$ ). Viscosity B-coefficients were used to calculate the free energies of activation of viscous flow. The results were discussed in terms of solute–solute and solute–solvent interactions on the basis of cosphere overlap model and transition state theory.