Hannover 2010 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 25: Poster: Photochemistry
MO 25.2: Poster
Donnerstag, 11. März 2010, 16:00–18:30, Lichthof
Spectroscopic studies of perylenebisimide dithienylcyclopentene perylenebisimide photoswitchable chromophore complexes — Christiane Hofmann1, •Martti Pärs1, Peter Bauer2, Mukundan Thelakkat2, and Jürgen Köhler1 — 1Universität Bayreuth, Lehrstuhl für Experimentalphysik IV, 95440 Bayreuth — 2Universität Bayreuth, Angewandte Funktionspolymere, 95440 Bayreuth
We investigate energy transfer dynamics in a tailor-made organic donor-switch-acceptor triad systems consisting of two perylenebisimide (PBI) units that are covalently linked by a dithienylcyclopentene photoswitch (DCP). The DCP behaves as a photoswichable unit which modulates the energy transfer rate from BPI to DCP unit, because it acts as a fluorescence quencher in the closed form. The switching efficiency of the photochromic triad dissolved in toluene was studied by steady-state absorption and emission spectroscopy. The switching kinetics and the lifetime of the (BPI) fluorescence was investigated by using a streak camera system with a time resolution of up to a few picoseconds.