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Complexation of Na+ ion “swithces on” the cation receptor 1, a calixarene that can form hydrogen bonds between its diamidopyridine group and a complementary group like thymine. If the latter is linked in turn to an anion receptor, for example a metalated porphyrin, a noncovalently linked bifunctional receptor results, which can complex simultaneously both the cation and the anion of an inorganic salt such as NaSCN.
Rudkevich et al. (Mon,) studied this question.
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