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O: Fachverband Oberflächenphysik
O 102: Heterogeneous Catalysis on Metals
O 102.11: Vortrag
Donnerstag, 19. März 2020, 13:15–13:30, TRE Phy
Adsorption Geometry of 2-Iodotriphenylene on Ag(111) and Cu(111) — •Alexander Ihle1, Sebastian Ahles2, Tobias Schlöder3, Doreen Mollenhauer3, Hermann A. Wegner2, Andre Schirmeisen1, and Daniel Ebeling1 — 1Institute of Applied Physics, Justus Liebig University Giessen, Germany — 2Institute of Organic Chemistry, Justus Liebig University Giessen, Germany — 3Institute of Physical Chemistry, Justus Liebig University Giessen, Germany
On-surface chemistry is a powerful tool for building covalent molecular structures. In particular, the catalytic properties of the metal substrate as well as the 2D confinement facilitate the synthesis of new structures that are not accessible via solution chemistry. In order to control the bottom up formation process precise knowledge about the adsorption geometry of the molecular precursors is needed since this will help to understand the reaction mechanisms in detail. Here we studied the adsorption geometry of 2-iodotriphenylene on Ag(111) and Cu(111). By using low temperature atomic force microscopy with CO-functionalized tips we are able to identify the precise adsorption position of the molecules and their orientation with respect to the substrate lattice. On both substrates we find one preferred and one less preferred adsorption configuration, which are directed by metal atoms in the surface and the sub-surface layer. Due to different molecule-substrate interactions these adsorption configurations differ significantly from each other for the two substrate materials. Hence, the adsorption position can be actively controlled by the choice of substrate material.