Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 20: Poster Monday: Solid-Liquid Interfaces

O 20.8: Poster

Montag, 5. September 2022, 18:00–20:00, P4

Self-organized structures of peri-arylenes on electrode surfaces — •Kristin Gratzfeld¹, Anna Kny¹, Tomasz Kosmala², Radosław Wasielewski², Marek Nowicki², Klaus Wandelt^1,2, and Moritz Sokolowski² — ¹Institut für Physikalische und Theoretische Chemie der Universität Bonn — ²Institute of Experimental Physics, University of Wroclaw, Poland

We investigated self-ordered structures of 3,4,9,10-perylene-tetracarboxylic acid (PTCA) on the Au(111) electrode interface. In recent electrochemical studies, the protonation/ deprotonation process of PTCA was studied, however no structural data information was reported, yet [1]. To investigate the structures of PTCA at the Au(111) electrode interface we used cyclic voltammetry (CV) and electrochemical STM (EC-STM). For negatively charged surfaces, we observed stripe like phases of PTCA with an edge-on orientation of the molecules that transform into a less dense phase at more positive potential with flat-lying molecules. We suppose that this transition is correlated with a partial deprotonation of the PTCA. Acknowledgement: This work was supported by the DFG through the research training group 2591, the DAAD (Deutscher Akademischer Austauschdienst) program Ostpartnerschaften and the NAWA (National Agency for Academic Exchange) program. We thank H. Baltruschat for helpful discussions and experimental support. [1] J. Am. Chem. Soc., 138, 1493, 2016.