Thermodynamic and Polarization Parameters of Dibenzo-18- crown- 6 in Mixed Methanol Water Solvents

The different thermodynamic parameters for the solvation (Free energies, enthalpies, and entropies) ( ΔGs, ΔHs &TΔSs) for dibenzo–18–crown–6 in mixed methanol–water solvents were calculated form the experimental solubility data at different temperatures. From the experimental refractive indices and densities for the saturated solutions, the total polarization (Pt), polarizability (α), induced dipole moment (μ) and the contribution of the electronic permittivity (ε∞) were evaluated. The solvation behavior of the crown ether used in these media was discussed in view of the estimated refraction and polarization parameters.Since dibenzo 18-crown-6 has a wide applications in analytical, industrial and biological ones, then the aim of this study is to explain its solvation behaviours in methanol.