Hannover 2010 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 15: Photochemistry II
MO 15.4: Vortrag
Mittwoch, 10. März 2010, 14:45–15:00, F 142
Single-molecule studies of photoswitchable chromophore complexes — •Martti Pärs1, Christiane Hofmann1, 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 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. In order to investigate the kinetics and the quantum yield of the switching process. we use a home-built wide-field imaging setup with multicolor excitations sources. This allows to control the state of the DCP unit and real-time detection of the BPI fluorescence from single triad complexes. Options for deliberate manipulation of the fluorescence intensity from individual molecules will be discussed.