Stangl, Thomas and Wilhelm, Philipp and Schmitz, Daniela and Remmerssen, Klaas and Henzel, Sebastian and Jester, Stefan-S. and Hoeger, Sigurd and Vogelsang, Jan and Lupton, John M. (2015) Temporal Fluctuations in Excimer-Like Interactions between pi-Conjugated Chromophores. JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 6 (8). pp. 1321-1326. ISSN 1948-7185,
Full text not available from this repository. (Request a copy)Abstract
Inter- or intramolecular coupling processes between chromophores such as excimer formation or H- and J-aggregation are crucial to describing the photophysics of closely packed films of conjugated polymers. Such coupling is highly distance dependent and should be sensitive to both fluctuations in the spacing between chromophores as well as the actual position on the chromophore where the exciton localizes. Single-molecule spectroscopy reveals these intrinsic fluctuations in well-defined bichromophoric model systems of cofacial oligomers. Signatures of interchromophoric interactions in the excited statespectral red shifting and broadening and a slowing of photoluminescence decaycorrelate with each other but scatter strongly between single molecules, implying an extraordinary distribution in coupling strengths. Furthermore, these excimer-like spectral fingerprints vary with time, revealing intrinsic dynamics in the coupling strength within one single dimer molecule, which constitutes the starting point for describing a molecular solid. Such spectral sensitivity to sub-Angstrom molecular dynamics could prove complementary to conventional FRET-based molecular rulers.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SINGLE-MOLECULE SPECTROSCOPY; SITE-SELECTIVE FLUORESCENCE; CHAIN DEFECT EMISSION; ENERGY-TRANSFER; INTERCHAIN INTERACTIONS; POLYMERS; AGGREGATION; DIMERS; FILMS; PHOTOLUMINESCENCE; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 22 Jul 2019 12:19 |
| Last Modified: | 22 Jul 2019 12:19 |
| URI: | https://pred.uni-regensburg.de/id/eprint/5633 |
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