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Allosteric molecular tweezers: By the introduction of porphyrin units to anion-acceptable biindole moiety (see scheme), the binding affinity of Cl− was significantly enhanced owing to the π–π interaction of porphyrin units. Furthermore, the biindole-bridged zinc porphyrin dimer binds Cl− as well as 1,4-diazabicyclo2.2.2octane (DABCO) in a strong positive allosteric manner.
Lee et al. (2009) studied this question.