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- Title
Crystallization‐Induced Emission of Azobenzene Derivatives.
- Authors
Yamauchi, Mitsuaki; Yokoyama, Kosuke; Aratani, Naoki; Yamada, Hiroko; Masuo, Sadahiro
- Abstract
Most azobenzene derivatives are utilized as well‐defined photoresponsive materials, but their emission properties have not been of great interest as they are relatively poor. Here, we report crystallization‐induced emission (CIE) based on the suppression of the photoisomerization of azobenzene derivatives. Although these molecules show negligible emission in solution, their microcrystals exhibit intense emission from the azobenzene moieties as a result of CIE. Upon rapid precipitation, fine particles with low crystallinity were kinetically formed and underwent CIE over time with a concomitant increase in crystallinity. Furthermore, we demonstrated "photocutting" of an emissive single crystal using a strong laser by a combination of CIE behavior and photomelting based on the photoisomerization of the azobenzene moiety. Our results regarding the CIE behavior of azobenzene derivatives in addition to their photoisomerization can provide a new platform for developing photoresponsive luminescent materials.
- Subjects
AZOBENZENE derivatives; PARTICULATE matter; PHOTOISOMERIZATION; SINGLE crystals; CRYSTALLINITY
- Publication
Angewandte Chemie, 2019, Vol 131, Issue 40, p14311
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201908121