Differences in the predicted aqueous pKa values (ΔpKa) have been calculated for 6465 crystalline complexes containing ionised and non-ionised acid–base pairs in the Cambridge Structural Database. A linear relationship between ΔpKa and the probability of proton transfer between acid–base pairs has been derived for crystalline complexes with ΔpKa between −1 and 4. The pKa rule is validated and quantitated.
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Aurora J. Cruz‐Cabeza (2012) studied this question.
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