Abstract
We investigated the solvent effects on the relative free energies of binding of <TEX>$Na^+$</TEX> and <TEX>$Li^+$</TEX> ions to 12-crown-4 and <TEX>${\Delta}log\;K_s$</TEX> (the difference of stability constant of binding) by a Monte Carlo simulation of statistical perturbation theory (SPT) in several solvents. Comparing the relative free energies of binding of <TEX>$Na^+$</TEX> and <TEX>$Li^+$</TEX> ions to 12-crown-4, in <TEX>$CH_3OH$</TEX> of this study with experimental works, there is a good agreement among the studies. We have reported the quantitative free energy polarity (of solvent) relationships (QFPR) of the relationship between the relative free energies and solvent polarity studied on the solvent effects on the relative free energies of binding of <TEX>$Na^+$</TEX> and <TEX>$Li^+$</TEX> ions to 12-crown-4.
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