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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.

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Author:Carsten DoscheGND, Wulfhard Mickler, Hans-Gerd LöhmannsröbenGND, Nicolas Agenet, K. Peter C. Vollhardt
Series (Serial Number):Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe (23)
Document Type:Postprint
Year of Completion: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
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften
Notes extern: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