Incorporation of an Anion‐Coordinated Triple Helicate into a Thin Film for Choline Recognition in an Aqueous System

Functional thin films, being fabricated by incorporating discrete supramolecular architectures, have potential applications in the research area such as sensing, energy storage, catalysis, and optoelectronics. Here, we have manifested that anion‐coordination triple helicate can be solution‐processed into a functional thin film through incorporation into a polymethyl methacrylate (PMMA) matrix. The thin films fabricated by incorporation of 3⊃GS/R (Film3⊃GS/R, 3 = anion‐coordination triple helicate) show multiple optical properties of fluorescence, CD, and CPL. In addition, Film3⊃NEt3H+ shows the ability to recognize choline and choline derivatives in water system. The successful recognition of Ch+ by Film3⊃NEt3H+ represents the first example of utilizing 'aniono'‐supramolecular architectures for biomolecule detection in aqueous solution and opens up a new route for designing biocompatible functional materials.