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O: Fachverband Oberflächenphysik

O 87: Metal Substrates: Structure, Epitaxy and Growth

O 87.8: Talk

Thursday, March 10, 2016, 17:00–17:15, S053

On the adsorption behavior of a porphyrin on different Cu surfaces: A comparative scanning tunneling microscopy study — •Michael Lepper, Liang Zhang, Michael Stark, Hans-Peter Steinrück, and Hubertus Marbach — Physikalische Chemie II and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058 Erlangen

Self-assembly of functional molecular building blocks on well-defined surfaces is a promising approach for the bottom-up fabrication of two-dimensional nanostructures with outstanding properties. In this respect, porphyrins are particularly attractive due to their distinct chemical and physical properties. In this study, we compare the adsorption of 2H-5,10,15,20-Tetrakis-(3,5-di-tert-butyl)-phenylporphyrin (2HTTBPP) on different substrates, i.e., Cu(110) and Cu(110)-(2x1)O, under ultra-high vacuum conditions by scanning tunneling microscopy. At room temperature, supramolecular arrangements are observed for 2HTTBPP on Cu(110)-(2x1)O, while on Cu(110) individual molecules in a disordered layer are found. Interestingly, the intramolecular conformations on the two substrates are quite different. The corresponding findings are interpreted by accounting for specific molecule-molecule and molecule-substrate interactions. In addition, the so-called self-metalation of 2HTTBPP with Cu atoms will be reported and discussed. Supported by the DFG through FOR 1878 (funCOS) and the AvH Stiftung.