Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 69: Nanostructures at surfaces:1D, 2D, networks – Poster
O 69.7: Poster
Wednesday, March 11, 2026, 18:00–20:00, P2
On-surface Synthesis of Aza-Coronoids — •Tim Naumann1, Zilin Ruan1, Olaf A. Kleykamp1, Linus Pohl2, Anton Nizovtsev2,3,4, Alix Kaczmarek2, Eugen Sharikow1, Jörg Sundermeyer1, Doreen Mollenhauer2,3,4, and J. Michael Gottfried1 — 1Marburg University, Hans-Meerwein-Str. 4, 35032 Marburg, Germany — 2Justus Liebig University Giessen, Heinrich-Buff-Ring 17, 35392 Giessen, Germany — 3Helmholtz Institute for Polymers in Energy Applications Jena, Lessingstr. 12-14, 07743 Jena, Germany — 4Institute for Technical and Environmental Chemistry, Friedrich-Schiller-Universität Jena, Philosophenweg 7a, 07743 Jena, Germany
Chemical reactivity and electronic properties of nanographenes are tailored by functionalization, edge topology and doping. A versatile sub-class within the nanographenes are coronoids, defined as benzenoids featuring a cavity. π-extended coronoids possess low solubility and are challenging target molecules for in-solution chemistry. However, reliable access via on-surface synthesis was demonstrated. Here, we combined in-solution and on-surface techniques to gain access to various aza-coronoids. Besides planar armchair-edge and zigzag-edge terminated coronoids, a curved coronoid was synthesized. Nitrogen functionalization of the inner cavity allows for hosting a metal atom and yields coronoid-metal complexes. In contrast, nitrogen core-doping significantly alters the electronic properties. Low-temperature scanning tunneling microscopy/spectroscopy (STM/STS), non-contact atomic force microscopy (nc-AFM) and DFT calculations were performed.
Keywords: Coronoids; Cycloarenes; Scanning probe microscopy; Nanographenes; Doping