Hamburg 2009 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 13: Molekülphysik Poster 1
MO 13.5: Poster
Dienstag, 3. März 2009, 16:30–19:00, VMP 8 Foyer
Energy- and charge-transfer processes in flexible organic donor-acceptor dyads — •Christiane Hofmann1, Peter Bauer2, Saif Haque3, Mukundan Thelakkat2, and Jürgen Köhler1 — 1Experimentalphysik IV und BIMF, Universität Bayreuth, D-95440 Bayreuth, Deutschland — 2Applied Functional Polymers, Universität Bayreuth, D-95440 Bayreuth, Deutschland — 3Department of Chemistry, Imperial College London, London SW7 2AZ, UK
We investigated energy- and electron-transfer processes in organic donor-acceptor dyads with complementary spectroscopic techniques. In these dyads, a triphenyldiamine (TPD) donor was linked to a perylenebisimide (PBI) acceptor by a flexible, non-conjugated bridge. Time-resolved fluorescence spectroscopy revealed a quenching of the donor emission, accompanied by a corresponding rise of the acceptor fluorescence. Additionally, we found a second quenching process affecting the acceptor fluorescence. The length as well as the chemical structure of the bridge between the donor and acceptor moieties were found to have a strong impact on the rates of both quenching processes while changing the solvent influenced mainly the rate of acceptor quenching. The possibility of an electron-transfer process from PBI to TPD being responsible for the additional acceptor quenching has been studied by transient absorption spectroscopy.