Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 14: Organic/bio Molecules on Metal Surfaces II

O 14.1: Vortrag

Montag, 31. März 2014, 16:00–16:15, TRE Phy

Adsorption behavior of porphycenes on a Cu(111) surface: A scanning tunneling microscopy study — •Michael Stark, Stefanie Ditze, Michael Lepper, Johannes Träg, Liang Zhang, Hans-Peter Steinrück, and Hubertus Marbach — Lehrstuhl für Physikalische Chemie II and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058

The knowledge of the adsorption behavior of large organic molecules, like porphyrin derivatives, on surfaces is a prerequisite to engineer their supramolecular architecture and to finally utilize their functional properties. Herein, we expand the surface science studies of porphyrins to their constitutional isomers, the so-called porphycenes. We investigate 2H-2,7,12,17-tetraphenylporphycene (2HTPPc) and 2H-2,7,12,17-tetrakis-(4-tert-butyl)-phenylporphycene (2HTTBPPc) on Cu(111) with scanning tunneling microscopy (STM) under ultra-high vacuum (UHV) conditions. Thereby, we found a dominant registry of the porphycene core with the substrate, regardless of its peripheral substituents and the actual supramolecular structures formed. Different supramolecular structures were identified depending on the peripheral substituents of the porphycenes. A particular interesting behavior is observed for 2HTPPc which assembles in highly ordered rows separated by rather loosely arranged molecular rows. In the latter we also observe occasional rotation of individual molecules at room temperature. The results will be presented and discussed addressing the role of specific molecule-molecule interactions.