Over the past few years, the fabrication of artificial light‐harvesting systems with aggregation‐induced emission (AIE) has attracted significant attention because of the wide applications of these systems in organic chemistry, supramolecular chemistry, energy chemistry, and even materials science. This progress report focuses on recent advances in the design and preparation of artificial light‐harvesting systems with AIE. In addition, the properties, functions, and applications of these systems are discussed.
Supramolecular cages/vesicles in biology display sophisticated structures and functions by utilizing af ew types of protein subunit quasi-equivalently at distinct geometrical locations.H owever,s ynthetic supramolecular cages still lack comparable complexity to reachthe high levels of functionality found in natural systems.Herein we report the self-assembly of giant pentagonal supramolecular prisms (molecular weight > 50 kDa) with tetratopic pyridinyl subunits serving different geometrical roles within the structures,a nd their packingi nto an ovel superstructure with unexpected three-fold rotational symmetry in asingle two-dimensional layer of crystalline state. The formation of these complicated structures is controlled by both the predetermined angles of the ligands and the mismatched structural tensions created from the multi-layered geometry of the building blocks.Suchaself-assembly strategy is extensively used by viruses to increase the volume and complexity of capsids and would provideanew approach to construct highly sophisticated supramolecular architectures.
The precise co-conformation regulation … …o ft opologically chiral [2]catenanes under two different external stimuli led to the construction of ab idirectional circularly polarized luminescence (CPL) switch, as reported by Xiao He,Wei Wang,Hai-Bo Yang, and co-workers in their Research Article (e202210542). Ther esults provide not only an attractive approach towards the construction of multistate CPL switches for practical uses but also apromising platform for the construction of novel chiral materials.
The construction of circularly polarized luminescence (CPL) switches with multiple switchable emission states and high dissymmetry factors (glum) has attracted increasing attention due to their broad applications in diverse fields such as the development of smart devices and sensors. Herein, a new family of AIE‐active chiral [3]rotaxanes were designed and synthesized, from which a novel CPL switching system was successfully constructed. The switching process was realized through the controlled motions of the chiral pillar[5]arene macrocycles along the axle through the addition or removal of the acetate anions, which not only modulated the chirality information transfer but also tuned the aggregations of the integrated [3]rotaxanes, thus resulting in reversible transformations between two emission states with both high photoluminescence quantum yields (PLQYs) and high dissymmetry factors (glum) values.
Aiming at the construction of novel circularly polarized luminescence (CPL) switches with multiple switchable emission states and high dissymmetry factors (g lum ), topologically chiral [2]catenanes were employed as the key platform to construct a novel multistate CPL switching system. Taking advantage of the precise coconformation regulations of the resultant pyrene-functionalized [2]catenanes under different external stimuli, reversible transformations between three emission states with different CPL performances, i.e. the initial "closed" form with a j g lum j value of 0.012, the "open" form with an almost complete turn-off of CPL emission, and the "protonated" form with a boosted j g lum j value of 0.022, were successfully realized. This study demonstrates the successful construction of not only the first topological chirality-based CPL switch, but also a novel bidirectional CPL switch, thus providing a promising platform for the construction of novel chiral materials.
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