期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 57, 期 19, 页码 5438-5443出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201802185
关键词
acenes; Baird aromaticity; cyclooctatetraene; excited-state dynamics; singlet fission
资金
- JST, PRESTO [JPMJPR12K5, JPMJPR16P6]
- JSPS [JP15H05482, JP15H01083, JP16H02249]
- Grants-in-Aid for Scientific Research [15H05482, 17H05258] Funding Source: KAKEN
A set of flapping acene dimers fused with an 8 cyclooctatetraene (COT) ring showed distinct excited-state dynamics in solution. While the anthracene dimer showed a fast V-shaped-to-planar conformational change within 10ps in the lowest excited singlet state, reminding us of extended Baird aromaticity, the tetracene dimer and the pentacene dimer underwent intramolecular singlet fission (SF) in different manners: A fast and reversible SF with a characteristic delayed fluorescence (FL), and a fast and quantitative SF, respectively. Conformational flexibility of the fused COT linkage plays an important role in these ultrafast dynamics, demonstrating the utility of the flapping molecular series as a versatile platform for designing photofunctional systems.
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