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. Author manuscript; available in PMC: 2016 Feb 3.
Published in final edited form as: J Am Chem Soc. 2015 Nov 12;137(46):14705–14715. doi: 10.1021/jacs.5b08395

Figure 9.

Figure 9

Models representing differences in ion association around a dsDNA as a function of salt propensity for cation–anion correlations. (A) Salts with high γ± such as NaI or CsF show little or no ion–ion correlations. Salts with low γ± such as NaF, RbCl, or CsBr show ion–ion correlations leading to formation of ion-pairs (B) or higher ion complexes (C). Cation–anion correlations are greater in the presence of a nucleic acid (compartment 1) and near to the nucleic acid compared to the bulk solution (compartment 2).