Chiral Binaphthylbis(4,4′‐Bipyridin‐1‐Ium)/Cucurbit[8]Uril Supramolecular System and Its Induced Circularly Polarized Luminescence.

Abstract: Circularly polarized luminescence (CPL) induced by host–guest complexation remains a challenge in supramolecular chemistry. Herein, a couple of CPL–silent enantiomeric guest binaphthylbis(4,4′‐bipyridinium) salts can emit obvious CPL in the presence of cucurbit[8]uril in aqueous media, due to the restriction of molecular rotation limitation effect. Such CPL can be reversibly adjusted by the addition of acid and base. Furthermore, the resultant supramolecular systems can interact with DNA, accompanied by the morphological conversion from branched supramolecular nanowires to exfoliated nanowires, which can enable to the exploration of such supramolecular systems as DNA markers by CPL signals. [ABSTRACT FROM AUTHOR]