Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 40: Organic Molecules at Surfaces 4: Chemistry on Surfaces
O 40.6: Vortrag
Mittwoch, 7. September 2022, 11:45–12:00, S051
Analysis of the 3-dimensional adsorption configuration of organic molecules by SPM manipulation and imaging — •Alexander Ihle1, Daniel Ebeling1, Daniel Kohrs2, Hermann A. Wegner2, and Andre Schirmeisen1 — 1Institute of Applied Physics, Justus Liebig University Giessen — 2Institute of Organic Chemistry, Justus Liebig University Giessen
On-surface chemistry is a powerful tool for building covalent molecular structures such as chains, networks, or graphene nanoribbons (GNRs). 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. The Ullmann type coupling is one of the most frequently applied on-surface reaction for synthesizing C-C bonded structures. However, only limited information is available about the three dimensional adsorption conformation of the molecular educts and how this affects the reaction pathway. Here, we studied on-surface reactions of 9-X-10-(1,1':3',1''-terphenyl-5'-yl)anthracene (X= bromine, iodine) on Cu(111), Ag(111) and Au(111). Using low-temperature atomic force microscopy with CO-functionalized tips, we can identify the precise adsorption conformation of the pristine molecules as well as the intermediate and final products. In particular, the three dimensional conformation of the intermediates strongly inhibits the intermolecular coupling reaction between the educts on all surfaces. Instead, intramolecular bond formation is observed.