Circularly polarized luminescence in molecular recognition systems: Recent achievements

• Published in: Chirality (New York, N.Y.) Vol. 35; no. 2; pp. 92 - 103
• Main Authors: Takaishi, Kazuto, Maeda, Chihiro, Ema, Tadashi
• Format: Journal Article
• Language: English
• Published: United States Wiley Subscription Services, Inc 01.02.2023
• Subjects: cage complexes; Chemical perception; Chemoreception; chirality induction; Circular polarization; circularly polarized luminescence; Coloring Agents; Dyes; host–guest complexes; Luminescence; macrocycles; molecular recognition systems; Recognition; Stereoisomerism; Supramolecular compounds; Switches; host-guest complexes; chirality induction; molecular recognition systems; circularly polarized luminescence; macrocycles; cage complexes
• ISSN: 0899-0042; 1520-636X; 1520-636X
• DOI: 10.1002/chir.23522

Circularly polarized luminescence (CPL) dyes are recognized to be new generation materials and have been actively developed. Molecular recognition systems provide nice approaches to novel CPL materials, such as stimuli‐responsive switches and chemical sensing materials. CPL may be induced simply by mixing chiral or achiral, luminescent or nonluminescent host and guest; there are several combinations. Molecular recognition can potentially save time and effort to construct well‐ordered chiral structures with noncovalent attractive interactions as compared with the multi‐step synthesis of covalently bonded dyes. It is a challenging subject to engage molecular recognition events with CPL, and it is important and interesting to see how it is achieved. In fact, simple molecular recognition systems can even enable the fine adjustment of CPL performance and detailed conformational/configurational analysis of the excited state. Here we overview the recent achievements of simple host–guest complexes capable of exhibiting CPL, summarizing concisely the host/guest structures, CPL intensities, and characteristics. In this review, simple host–guest systems capable of exhibiting circularly polarized luminescence (CPL) are overviewed. The pioneering works summarized herein will provide some hints on the creation of easy‐to‐prepare and high‐performance CPL materials in future.