期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 42, 页码 22711-22716出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202108661
关键词
chiral fractal structure; circularly polarized luminescence; halogen bond; self-assembly
资金
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB36000000]
- National Natural Science Foundation of China [21905065, 21802027, 91856115]
- Ministry of Science and Technology of the People's Republic of China [2017YFA0206600, 2016YFA0203400]
- Beijing Natural Science Foundation [2212023]
- Postdoctoral Innovation Talent Support Project [BX20180082]
- China Postdoctoral Science Foundation [2019M650603]
In this study, an achiral molecule directed chiral self-assembly via halogen bonds was reported, leading to unprecedented chiral fractal structures and significantly amplified CPL. The design of the chiral emitter and the highly directional halogen bond played crucial roles in hierarchically chirality transfer and amplified dissymmetry factors.
Self-assembled chiroptical materials have attracted considerable attention due to their great applications in wide fields. During the chiral self-assembly, it remains unknown how achiral molecules can affect the assembly process and their final chiroptical performance. Herein, we report an achiral molecule directed chiral self-assembly via halogen bonds, exhibiting not only an unprecedented chiral fractal architecture but also significantly amplified circularly polarized luminescence (CPL). Two axially chiral emitters with halogen bond sites co-assemble with an achiral 1,4-diiodotetrafluorobenzene (F4DIB) and well-ordered chiral fractal structures with asymmetry amplification are obtained. The enhancement of the dissymmetry factors of the assemblies was up to 0.051 and 0.011, which was approximately 100 folds than those of the corresponding molecules. It was found that both the design of the chiral emitter and the highly directional halogen bond played an important role in hierarchically chirality transfer from chiral emitters to the micrometer scale chiral fractal morphology and amplified dissymmetry factors. We hope that this strategy can give a further insight into the fabrication of structurally unique featured highly efficient chiroptical materials.
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