Linker-Dependent Singlet Fission in Tetracene Dimers
| العنوان: | Linker-Dependent Singlet Fission in Tetracene Dimers |
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| المؤلفون: | Nadezhda V. Korovina, Anna I. Krylov, Stephen E. Bradforth, Cassidy Feltenberger, Xintian Feng, Jimmy Joy, Mark E. Thompson |
| المصدر: | Journal of the American Chemical Society. 140:10179-10190 |
| بيانات النشر: | American Chemical Society (ACS), 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Dimer, Exciton, 02 engineering and technology, General Chemistry, Chromophore, Conjugated system, 010402 general chemistry, 021001 nanoscience & nanotechnology, Photochemistry, 01 natural sciences, Biochemistry, Catalysis, 0104 chemical sciences, chemistry.chemical_compound, Colloid and Surface Chemistry, Tetracene, chemistry, Singlet fission, Physics::Atomic and Molecular Clusters, Condensed Matter::Strongly Correlated Electrons, 0210 nano-technology, Benzene, Linker |
| الوصف: | Separation of triplet excitons produced by singlet fission is crucial for efficient application of singlet fission materials. While earlier works explored the first step of singlet fission, the formation of the correlated triplet pair state, the focus of recent studies has been on understanding the second step of singlet fission, the formation of independent triplets from the correlated pair state. We present the synthesis and excited-state dynamics of meta- and para-bis(ethynyltetracenyl)benzene dimers that are analogues to the ortho-bis(ethynyltetracenyl)benzene dimer reported by our groups previously. A comparison of the excited-state properties of these dimers allows us to investigate the effects of electronic conjugation and coupling on singlet fission between the ethynyltetracene units within a dimer. In the para isomer, in which the two chromophores are conjugated, the singlet exciton yields the correlated triplet pair state, from which the triplet excitons can decouple via molecular rotations. In contrast, the meta isomer in which the two chromophores are cross-coupled predominantly relaxes via radiative decay. We also report the synthesis and excited-state dynamics of two para dimers with different bridging units joining the ethynyltetracenes. The rate of singlet fission is found to be faster in the dimer with the bridging unit that has orbitals closer in energy to that of the ethynyltetracene chromophores. |
| تدمد: | 1520-5126 0002-7863 |
| DOI: | 10.1021/jacs.8b04401 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::37e9faa44b08a55a202bc9ede7f013d2 https://doi.org/10.1021/jacs.8b04401 |
| رقم الانضمام: | edsair.doi.dedup.....37e9faa44b08a55a202bc9ede7f013d2 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15205126 00027863 |
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| DOI: | 10.1021/jacs.8b04401 |