Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 68: Focus Session Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation IV
O 68.1: Vortrag
Mittwoch, 19. März 2025, 15:00–15:15, H24
On-surface Synthesis of Aza-Coronoids — •Tim Naumann1, Zilin Ruan1, Olaf Kleykamp1, Alix Kaczmarek2, Linus Pohl2, Andreas Achazi2, Eugen Sharikow1, Doreen Mollenhauer2,3,4, Jörg Sundermeyer1, and J. Michael Gottfried1 — 1Philipps-Universität Marburg, Hans-Meerwein-Str. 4, 35032 Marburg, Germany — 2Justus Liebig Universität Gießen, Heinrich-Buff-Ring 17, 35392 Gießen, Germany — 3Helmholtz-Institut für Polymere in Energieanwendungen, Lessingstr. 12-14, 07743 Jena, Germany — 4Institut für Technische Chemie und Umweltchemie, Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany
The properties of nanographenes can be tailored by altering the topology, introducing defect sites like vacancies, or doping with heteroatoms. Coronoids represent a versatile sub-class of the nanographenes and can be regarded as benzenoids featuring a cavity. In-solution synthesis of extended coronoids has shown to be challenging due to their low solubility. To gain access to various aza-coronoids, we combined in-solution and on-surface techniques. By modification of the precursor's substituents, the edge termination of the coronoids is controlled. Besides planar armchair-edge and zigzag-edge terminated coronoids, a curved coronoid was synthesized. Nitrogen functionalization of the cavity allows for hosting a metal atom, giving rise to the formation of coronoid-metal complexes. The electronic and geometric properties of the nanostructures were investigated by low temperature scanning tunneling microscopy/spectroscopy (STM/STS) and non-contact atomic force microscopy (nc-AFM) and supported by DFT calculations.
Keywords: Carbon Nanostructures; Coronoids; On-surface Synthesis; Scanning Probe Microscopy; Ultra high vacuum