Makale detayı · 2024
Mono- and Bichromophores Formed from Perylene Monoimide Diesters: Competition between Intramolecular Charge Transfer and Intermolecular Singlet Exciton Fission
The Journal of Physical Chemistry A
- Yıl
- 2024
- ISSN
1089-5639- Tür
- article
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Özet
İngilizce (OpenAlex)
High Resolution Image Download MS PowerPoint Slide Perylene monoimide diesters and the corresponding phenyl-linked bichromophores are strongly fluorescent in dilute solution with minimal triplet population after relaxation of the initial Franck–Condon state. The monomer forms nonemissive face-to-face dimers in solution, wherein illumination leads to formation of a spin-correlated, triplet pair with a yield of ca . 13% and with a time constant of 4 ± 1 ps. The triplet pair, which is localized on the aggregate, cannot separate and decays with a mean lifetime of 80 ± 10 ps. The relaxed S 1 state of the weakly coupled, phenyl-linked bichromophores establishes an equilibrium with an intramolecular charge-transfer state over a hundred picoseconds or so, depending on the solvent and the geometry of the linkage. This equilibrium mixture, being dominated by the relaxed S 1 state, decays on the nanosecond time scale in solution at room temperature without implication of a triplet state. Self-association occurs at higher concentration and, for the para -bridged bichromophore, leads to inefficient triplet formation in tetrahydrofuran at room temperature.
Konular
- Molecular Junctions and Nanostructures
- Photoreceptor and optogenetics research
- Photochemistry and Electron Transfer Studies
Birincil konu Molecular Junctions and Nanostructures