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Angew Chem Int Ed Engl. 2019 Dec 6. doi: 10.1002/anie.201913383. [Epub ahead of print]

Dancing Brightly Under Light: Intriguing Photomechanical Luminescence in Constructing Through-Space Conjugated AIEgens.

Author information

1
CHINA.
2
South China University of Technology, State Key Laboratory of Luminescent Materials and Devices, Wushan Road 381, 510640, Guangzhou, CHINA.
3
HONG KONG.

Abstract

Transforming molecular motions into macroscopic scale is a topic of great interest to nanoscience. Photomechanical effect is a promising strategy to realize this purpose but remains challenging to design molecular materials with superior photomechanical effect that can be visually monitored under UV light. Herein, we wish to report intriguing photomechanical luminescence driven by photodimerization of 2-phenylbenzo[b]thiophene 1,1-dioxide (P-BTO) in molecular crystals, and elucidate working mechanism and substituent effect via crystallography analysis and theoretical calculation. Striking splitting, hopping and bending mechanical behaviors accompanied by significant blue fluorescence enhancement are observed for P-BTO crystals under UV light, which is attributed to the formation of photodimer 2P-BTO. Although 2P-BTO is poorly π-conjugated because of the central cyclobutane ring, it exhibits prominent through-space conjugation and aggregation-induced emission (AIE) characters, affording strong solid-state blue fluorescence at 415 nm with an excellent quantum yield of up to 96.2%. This work not only provides novel molecular crystals with photomechanical luminescence but also explores a new kind of AIE luminogens (AIEgens) based on a tailored through-space conjugated framework.

KEYWORDS:

aggregation-induced emission; photochemical reaction; photodimerization; photomechanical luminescence; through-space conjugation

PMID:
31808601
DOI:
10.1002/anie.201913383

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