Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

Partial molar volumes V0 and viscosity B-coefficients of N,N'-ethylene-bis(salicylideneiminato)cobalt(II), abbreviated as Co(salen), in different mass fractions (0 to 0.40) of 1,4-dioxane + methanol mixtures were determined from solution density and viscosity measurements at (298.15, 303.15, 308.15, and 313.15) K under ambient pressure. Apparent molar volumes V and density data at the experimental temperatures were used to calculate the apparent molar expansibilities E of Co(salen) solutions; the partial molar expansibilities E0 were then determined from the relation: E = E0 + SE(m)1/2. The temperature dependence of E0 values yielded (?E0/?T)P; the signs of the (?E0/?T)P values were discussed to reveal the structure promoting ability of Co(salen) in the experimental solvent/solvent mixtures. The activation parameters of viscous flow for the ternary solutions were also derived and discussed in terms of transition state theory. Various results indicated that the ternary system under investigation is characterized by structural changes and strong solute solvent interactions.