Solution Thermodynamics of N,N /-Ethylenebis-(salicylideneiminato)-diaquochromium(III) Chloride in Aqueous Dimethylsulphoxide

The densities, viscosities and refractive indices of N,N (/)-ethylene-bis(salicylideneiminato)-diaquochromium(III) chloride, [Cr(salen)(H2O)(2)]Cl, in aqueous dimethylsulfoxide (DMSO) with different mass fractions (w (2) = 0.20, 0.40, 0.60, 0.80 and 1.00) of DMSO were determined at 298.15, 308.15 and 318.15 K under atmospheric pressure. From measured densities, viscosities and refractive indices the apparent molar volumes (V (phi) ), standard partial molar volume (V (phi) (0) ), the slope (S (V) (*) ), standard isobaric partial molar expansibility (phi (E) (0) ) and its temperature dependence (a,phi (E) (0) /a,T) (p) , the viscosity B-coefficient, its temperature dependence (a,B/a,T), solvation number (S (n) ) and apparent molar refractivity (R (D) (phi) ), etc., were calculated and discussed on the basis of ion-ion and ion-solvent interactions. These results revealed that the solutions are characterized by ion-solvent interactions rather than by ion-ion interactions and the complex behaves as a long range structure maker. Thermodynamics of viscous flow was discussed in terms of transition state theory.