Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

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

O 52.13: Vortrag

Donnerstag, 26. März 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 Schiffrim^1,2, and Johannes V. Barth² — ¹Department 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.