Partial molar volumes and viscosity B-coefficients for N,N′-ethylenebis(salicylideneiminato)-diaquochromium(III) chloride in methanolic solutions of 1-butyl-2,3-dimethylimidazolium tetrafluoroborate at T = (298.15, 308.15, and 318.15) K

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 (phi(V)), the slope (S*(V)), standard partial molar volume (phi(0)(V)), transfer volume (Delta(t)phi(0)(V)), the viscosity B-coefficient, its temperature derivative (partial derivative B/partial derivative T), solvation number (S-n), etc. were calculated and discussed on the basis of ion-ion and ion-solvent interactions. In the investigated temperature range, the relation: phi(0)(V) = a(0) + a(1)T, was used to determine the temperature dependence of the partial molar volumes phi(0)(V), i. e., partial molar expansibilities (phi(0)(E)). Temperature dependence of the viscosity B-coefficient (partial derivative B/partial derivative T) 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. (C) 2013 Elsevier Ltd. All rights reserved.