Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

Ion ion and ion solvent interactions for N,N'-ethylene-bis(salicylideneiminato)-diaquochromium(III) chloride, [Cr(salen)(H2O)2]Cl, dissolved in solutions of 1-butyl-2,3-dimethylimidazolium tetrafluoroborate, [bdmim]BF4 (0.005 to 0.020 mol dm 3) in methanol (MeOH) were investigated by a combination of physicochemical properties at 298.15, 308.15 and 318.15 K under ambient pressure. From measured solution densities and viscosities apparent molar volume (uV), the slope (S V ), standard partial molar volume (u0 V ), transfer volume (Dtu0 V ), the viscosity B-coefficient, its temperature derivative (oB/oT), solvation number (Sn), etc. were calculated and discussed on the basis of ion ion and ion solvent interactions. In the investigated temperature range, the relation: u0 V 1/4 a0 p a1T, was used to determine the temperature dependence of the partial molar volumes u0 V , i.e., partial molar expansibilities (u0E ). Temperature dependence of the viscosity B-coefficient (oB/oT) values revealed the complex to be a long-range structure breaker. Thermodynamics of viscous flow were discussed on the basis of the transition state theory.