Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 49: Surface Chemical Reactions and Heterogeneous Catalysis III
O 49.7: Vortrag
Mittwoch, 2. April 2014, 12:00–12:15, PHY C 213
Substrate induced dehydrogenation: Transformation of octaethylporphyrin into tetrabenzoporphyrin — •Merlin Schmuck1, Dennis van Vörden2, Manfred Lange2, Johannes Schaffert2, Maren Cottin2, Christian Bobisch2, and Rolf Möller2 — 1Department of Physical Chemistry I, Ruhr-University Bochum, 44801 Bochum — 2Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Lotharstr. 1-21, 47048 Duisburg, Germany
Solids of organic molecules can exhibit semiconducting properties but have many more possibilities to manipulate their electronic properties than compound semiconductors. That makes them interesting for numerous technical applications. One of such organic molecules is the porphyrin molecule, which is already in use for solar cells. Its electronic properties can be manipulated through different metallic core atoms and different ligands like ethyl groups or benzene rings or even more complex side groups. During the characterization of octaethylporphyrin iron (lll) chloride via topographical STM imaging, we observed the thermally induced transformation of such a porphyrin derivative on a Cu(111) substrate to tetrabenzoporphyrin (TBP) by annealing the sample at about 450 K. The TBP was identified by comparing the newly formed molecules with iron phthalocyanine in mixed layers. Furthermore, an activation energy of this process was determined by counting the number of events for various temperatures. (D. van Vörden et al., J. Chem. Phys. 138, 211102 (2013))