Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 18: Poster: Transport and Spectroscopy in Molecular Nanostructures (Intersectional Session with MO)
CPP 18.4: Poster
Dienstag, 15. März 2011, 18:00–20:00, P1
Ultrafast dynamics of a new model bisporphyrin — •Martin Kullmann1, Arthur Hipke1, Patrick Nuernberger1, Daniel C. G. Götz2, Gerhard Bringmann2, and Tobias Brixner1 — 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg — 2Institut für Organische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg
Porphyrins are attractive molecular systems because their tetrapyrrolic structure is similar to the light-harvesting chlorophyll which enables biomimetic applications like organic photovoltaic solar cells. The studies described in the present contribution offer insight into the photochemistry of an intrinsically axially chiral, directly β,β′-linked porphyrin dimer, bis[tetraphenylporphyrinato-zinc(II)] (ZnTPP)2.
We present a comparative fs-resolved transient absorption study of (ZnTPP)2 and its monomeric subunit ZnTPP after excitation to their respective first and second excited electronic state. In contrast to similar experiments on multiporphyrin systems which focused on a single time domain, often not extending over more than a few picoseconds, we provide a complete analysis on time scales ranging up to the nanosecond regime.
Results from global analysis schemes applied to both molecules will be presented. The monomer’s relaxation process, which is in strong agreement with the literature, differs significantly from the dimer’s kinetics. Preliminary interpretations based on this observation as well as on comparisons with similar literature-known compounds will be discussed.