Regensburg 2010 – scientific programme

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O: Fachverband Oberflächenphysik

O 25: Metal substrates: Adsorption of organic / bio molecules III

O 25.3: Talk

Tuesday, March 23, 2010, 11:00–11:15, H36

Scanning Tunneling Microscopy investigation of different porphynoids on a Ni-prestructured Cu(111) surface — •Michael Röckert, Florian Buchner, Elisabeth Zillner, Stefanie Gläßel, Hans-Peter Steinrück, and Hubertus Marbach — Lehrstuhl für Physikalische Chemie II and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Egerlandstraße 3, D-91058 Erlangen

The assembly of organic molecules on single-crystal surfaces is an approach towards the creation of novel materials with outstanding properties. Porphyrins appear to be ideal candidates to generate functional molecular devices, due to their self-assembly properties and their versatile functionality. In the present work we study the possibility to locally anchor or functionalize porphyrins on a prestructured surface, namely a composite Ni/Cu(111) surface, by scanning tunneling microscopy (STM) in ultra-high vacuum at room temperature. Based on scanning tunneling micrographs and movies the dynamics, assembly and intramolecular conformation of the corresponding porphyrins (2HTPP, CoTPP, OEP) as well as the role of molecule-molecule and molecule-substrate interactions are discussed. The obtained findings indeed indicate the possibility to locally anchor and/or functionalize (e.g. metalate [1-2]) the porphyrins on a Cu(111) surface prestructured either with atomically flat Ni- or oxygen-islands. This work has been funded by the DFG through Sonderforschungsbereich 583.

[1] F. Buchner et al., ChemPhysChem, 2007. 8(2): p. 241-243 [2] T.E. Shubina et al., JACS, 2007. 129(30): p. 9476-9483.