Photoinduced electron transfer in [N]phenylenes
- First studies of electron transfer in [N]phenylenes were performed in bimolecular quenching reactions of angular [3]- and triangular [4]phenylene with various electron acceptors. The relation between the quenching rate constants kq and the free energy change of the electron transfer (ΔG0CS ) could be described by the Rehm-Weller equation. From the experimental results, a reorganization energy λ of 0.7 eV was derived. Intramolecular electron transfer reactions were studied in an [N]phenylene bichomophore and a corresponding reference compound. Fluorescence lifetime and quantum yield of the bichromophor display a characteristic dependence on the solvent polarity, whereas the corresponding values of the reference compound remain constant. From the results, a nearly isoenergonic ΔG0CS can be determined. As the triplet quantum yield is nearly independent of the polarity, charge recombination leads to the population of the triplet state.
Author details: | Carsten DoscheGND, Wulfhard Mickler, Hans-Gerd LöhmannsröbenORCiDGND, Nicolas Agenet, K. Peter C. Vollhardt |
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URN: | urn:nbn:de:kobv:517-opus-12463 |
Publication series (Volume number): | Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe (23) |
Publication type: | Postprint |
Language: | English |
Publication year: | 2007 |
Publishing institution: | Universität Potsdam |
Release date: | 2007/02/12 |
Tag: | [N]phenylene dyads; [N]phenylenes; photoinduced electron transfer |
Source: | Journal of Photochemistry and Photobiology A: Chemistry, In Press, Accepted Manuscript |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie |
Extern / Extern | |
DDC classification: | 5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften |
External remark: | This paper is accepted for publication in: Journal of Photochemistry and Photobiology A: Chemistry ISSN: 1010-6030 DOI: 10.1016/j.jphotochem.2006.12.038 Copyright © 2007 Elsevier |