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Developing synthetic receptors for selectively binding cations,anions and small organic molecules have been attracted increasing attention due to their biological importance in the past a few decades.Foldamers,artificial analogues of biopolymers having a strong tendency to adopt well-defined conformation,hold great promise in this respect as hosts for biological interesting guests because of their dynamic internal cavities or channels.Recent reports demonstrated that the cavity or channel of foldamers could be used for molecular recognitions and supromolecular catalysis.