| Autor: |
Dr. Kristoffer A. Thom, Oliver Nolden, Dr. Oliver Weingart, Dr. Saika Izumi, Prof. Dr. Satoshi Minakata, Prof. Dr. Youhei Takeda, Prof. Dr. Peter Gilch |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
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| Zdroj: |
ChemistryOpen, Vol 12, Iss 5, Pp n/a-n/a (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2191-1363 |
| DOI: |
10.1002/open.202300026 |
| Popis: |
Abstract The photophysics of a thermally activated delayed fluorescence (TADF) emitting macrocycle consisting of two dibenzo[a,j]phenazine acceptor moieties bridged by two N,N,N’,N’‐tetraphenylene‐1,4‐diamine donor units was scrutinized in solution by steady‐state and time‐resolved spectroscopy. The fluorescence lifetime of the compound proved to be strongly solvent‐dependent. It ranges from 6.3 ns in cyclohexane to 34 ps in dimethyl sulfoxide. In polar solvents the fluorescence decay is predominantly due to internal conversion. In non‐polar ones radiative decay and intersystem crossing contribute. Contrary to the behaviour in polymer matrices (S. Izumi et al., J. Am. Chem. Soc. 2020, 142, 1482) the excited state decay is not predominantly due to prompt and delayed fluorescence. The solvent‐dependent behaviour is analyzed with the aid of quantum chemical computations. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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