Abstract

Mean force potentials [W(r)] for the Na2+–Cl− and Na2+–Na2+ ion-pairs in water are calculated in order to investigate the effects of the cation electric charge on the ion-pair association. The constrained molecular dynamics simulation method is used. W(r) for Na2+–Cl− shows two minima corresponding to the contact and solvent-separated ion pairs with dissociation–association barriers which are markedly higher than those for Na+–Cl−. Unlike for Na+–Na+, W(r) for Na2+–Na2+ does not show any noticeable minimum.

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