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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)nCOOH⋅⋅⋅I− superanion matches the dication alkyl chain length. Dynamic recognition is also demonstrated in solution, where the...
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