The assembly of polymeric supramolecules is a powerful alternative to prepare the functional materials that display the unexpected properties. 1–6 In the last decade, the extensive effort has been devoted to developing the supramolecular assemblies, which reveal the specific molecules/ions selectivity. 7 Among them, the metal cations, such as Na + , K + , Mg 2+ , and Ca 2+ , are very important and often associated with the regulatory activities of proteins ...