Clustering-triggered Emission of Nonaromatic Polymers with Multitype Heteroatoms and Effective Hydrogen Bonding

Nonconventional luminophores without large conjugated structures are attracting increasing attention for their unique aggregation-induced emission(AIE) properties and promising applications in optoelectronic and biomedical areas. The emission mechanism, however, remains elusive, which makes rational...

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Bibliographic Details
Published in:Chemical research in Chinese universities 2021-02, Vol.37 (1), p.177-182
Main Authors: Kausar, Fahmeeda, Yang, Tianjia, Zhao, Zihao, Zhang, Yongming, Yuan, Wang Zhang
Format: Article
Language:English
Subjects:
Analytical Chemistry
Chemical synthesis
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Chromophores
Clustering
Electron clouds
Emission
Hydrogen bonding
Inorganic Chemistry
Luminescence
N electrons
Optoelectronics
Organic Chemistry
Phosphorescence
Physical Chemistry
Polymers
Room temperature
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Summary:Nonconventional luminophores without large conjugated structures are attracting increasing attention for their unique aggregation-induced emission(AIE) properties and promising applications in optoelectronic and biomedical areas. The emission mechanism, however, remains elusive, which makes rational molecular design difficult. Recently, we proposed the clustering-triggered emission(CTE) mechanism to illustrate the emission. The clustering of electron-rich nonconventional chromophores with π and/or n electrons and consequent electron cloud overlap is crucial to the luminescence. Herein, based on the CTE mechanism, nonaromatic polymers containing multitype heteroatoms( i.e. , O, N, and S) and involving amide(CONH) and sulfide(-S-) groups were designed and synthesized through facile thiol-ene click chemistry. The resulting polymers demonstrated typical concentration-enhanced emission, AIE phenomenon, and excitation-dependent emission. Notably, compared with polysulfides, these polymers exhibited much higher solid-state emission efficiencies, because of the incorporation of amide units, which contributed to the formation of emissive clusters with highly rigidified conformations through effective hydrogen bonding. Furthermore, distinct persistent cryogenic phosphorescence or even room temperature phosphorescence(RTP) was noticed. These photophysical behaviors can well be rationalized in terms of the CTE mechanism, indicating the feasibility of rational molecular design and luminescence regulation.
ISSN:1005-9040
2210-3171
DOI:10.1007/s40242-021-0414-1