The complex photo-rearrangement of a heterocyclic N-oxide: Kinetics from picoseconds to minutes
| Autor: | Gerald Ryseck, Nadja Regner, Björn Heinz, Peter Gilch, Elina Borysova, Thorben Cordes |
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| Přispěvatelé: | Zernike Institute for Advanced Materials, Molecular Biophysics, Nanotechnology and Biophysics in Medicine (NANOBIOMED) |
| Rok vydání: | 2009 |
| Předmět: |
Chemistry
General Chemical Engineering Kinetics General Physics and Astronomy Infrared spectroscopy General Chemistry Photochemistry Fluorescence Fluorescence spectroscopy Ultraviolet visible spectroscopy IR spectroscopy Femtosecond spectroscopy Heteroaromatic N-oxides Triplet state Absorption (chemistry) Femtochemistry UV/vis spectroscopy |
| Zdroj: | Journal of Photochemistry and Photobiology A: Chemistry, 206(1), 10-17 |
| ISSN: | 1010-6030 |
| DOI: | 10.1016/j.jphotochem.2009.05.015 |
| Popis: | The photo-induced rearrangement of 2-benzoyl-3-phenylquinoxaline-1,4-dioxide yielding 1,3-dibenzoylbenzimidazolone (DBBI) is studied by time-resolved fluorescence, UV/vis absorption, and IR spectroscopy. This complex rearrangement occurs on time scales ranging from 0.1 ps up to minutes. Processes within the excited singlet state(s) (0.1–1 ps) are followed by a multi-phasic depletion of the fluorescent states (time constants of 1–200 ps). During that depletion both a triplet state and a precursor of the photo-product are populated. In absence of oxygen the triplet state decays in 8 μ s. It does not participate in the formation of the photoproduct. A process with a time constant of 77 min terminates the product formation. It can be assigned to a hindered rotation of the benzoyl residues in DBBI. |
| Databáze: | OpenAIRE |
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