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Dresden 2009 – scientific programme

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O: Fachverband Oberflächenphysik

O 52: Metal substrates: Adsorption of organic / bio molecules VII

O 52.13: Talk

Thursday, March 26, 2009, 18:00–18:15, SCH A118

Dimerization Boosts One-Dimensional Mobility of Conformationally Adapted Porphyrins on a Hexagonal Surface Atomic Lattice — •Maximilian Eichberger1, Matthias Marschall2, Joachim Reichert2, Alexander Weber-Bargioni1, Willi Auwärter2, Richard L. C. Wang3, Hans J. Kreuzer3, Yan Pennec1, Agustin Schiffrim1,2, and Johannes V. Barth21Department of Physics & Astronomy, University of British Columbia, Vancouver, Canada — 2Physik Department, TU München, Germany — 3Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Canada

We employed temperature-controlled fast-scanning tunneling microscopy to monitor the diffusion of tetrapyridylporphyrin molecules on the Cu(111) surface. The data reveal unidirectional thermal migration of conformationally adapted monomers in the 300-360 K temperature range. Surprisingly equally oriented molecules spontaneously form dimers that feature a drastically increased one-dimensional diffusivity. The analysis of the bonding and mobility characteristics indicates that this boost is driven by a collective transport mechanism of a metallosupramolecular complex.

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