Abstract
Bis(trimethylammonium) alkane diiodides dynamically encapsulate dicarboxylic acids through intermolecular hydrogen bonds between the I- anions of the hosts and the carboxylic OH groups of the guests. A selective recognition is realized when the size of the I- ⋅⋅⋅HOOC(CH2 /CF2 )n COOH⋅⋅⋅I- superanion matches the dication alkyl chain length. Dynamic recognition is also demonstrated in solution, where the presence of the size-matching organic salt boosts the acid solubility profile, thus allowing efficient mixture separation.
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