Düsseldorf 2007 – scientific programme
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MO: Fachverband Molekülphysik
MO 24: Femtosecond Spectroscopy III
MO 24.2: Talk
Tuesday, March 20, 2007, 14:45–15:00, 6C
Dual Fluorescence in the Photochemical ZE Isomerization of Hemistilbene/Hemithioindigo-Molecules (HTI) — •Thorben Cordes1, Nadja Regner1, Björn Heinz1, Tobias Schrader1, Christian Hoppmann2, Karola Rück-Braun2, and Wolfgang Zinth1 — 1LMU München, Lehrstuhl für BioMolekulare Optik, Oettingenstraße 67, 80538 München — 2Technische Universität Berlin, Institut für Chemie, Straße des 17. Juni 135, 10623 Berlin
Photoinduced isomerizations are intensively studied reactions due to their importance in chemistry and biology. Systems containing conjugated double bonds (e.g. stilbene, hexatriene) are used as model systems for Rhodopsin or Carotinoids to investigate ultrafast photoreactions and to understand them in detail. A combination of a hemistilbene part with the half of a thioindigo-dye brings up a new class of photochromic compounds. It could be shown, that these HTI-molecules are suitable to act as ultrafast light trigger in chromopeptides[1]. In this context these photoinduced reactions have been studied with pump-probe spectroscopy in the visible. To obtain a clear insight in the photochemical pathway the transient absorption data is complemented with time-resolved fluorescence and IR measurements. By combination of these techniques the photochemical pathway of the ZE isomerization is revealed.
[1] T. Cordes et. al. Chem. Phys. Lett. 428 (2006) 167-173