Knorr, Johannes and Suelzner, Niklas and Geissler, Bastian and Spies, Christian and Grandjean, Alexander and Kutta, Roger Jan and Jung, Gregor and Nuernberger, Patrick (2022) Ultrafast transient absorption and solvation of a super-photoacid in acetoneous environments. PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES, 21 (12). pp. 2179-2192. ISSN 1474-905X, 1474-9092
Full text not available from this repository. (Request a copy)Abstract
The phenomenon of photoacidity, i.e., an increase in acidity by several orders of magnitude upon electronic excitation, is frequently encountered in aromatic alcohols capable of transferring a proton to a suitable acceptor. A promising new class of neutral super-photoacids based on pyranine derivatives has been shown to exhibit pronounced solvatochromic effects. To disclose the underlying mechanisms contributing to excited-state proton transfer (ESPT) and the temporal characteristics of solvation and ESPT, we scrutinize the associated ultrafast dynamics of the strongest photoacid of this class, namely tris(1,1,1,3,3,3-hexafluoropropan-2-yl)8-hydroxypyrene-1,3,6-trisulfonate, in acetoneous environment, thereby finding experimental evidence for ESPT even under these adverse conditions for proton transfer. Juxtaposing results from time-correlated single-photon counting and femtosecond transient absorption measurements combined with a complete decomposition of all signal components, i.e., absorption of ground and excited states as well as stimulated emission, we disclose dynamics of solvation, rotational diffusion, and radiative relaxation processes in acetone and identify the relevant steps of ESPT along with the associated time scales.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | STATE PROTON-TRANSFER; PHOTOSYNTHETIC REACTION-CENTER; EXCITED-STATE; GEMINATE RECOMBINATION; INTERMOLECULAR PROTON; ENERGY-TRANSFER; POLARIZATION ANISOTROPY; PYRANINE; SOLVENT; DYNAMICS |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Physical Chemistry I > Prof. Dr. Patrick Nürnberger |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Feb 2024 14:27 |
| Last Modified: | 29 Feb 2024 15:16 |
| URI: | https://pred.uni-regensburg.de/id/eprint/57769 |
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