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 68.3: Vortrag

Mittwoch, 19. März 2025, 15:30–15:45, H24

On-surface synthesis of porphyrin-capped carbon nanocones — Nemanja Kocic¹, Andreas Dörr¹, Moritz Villmow¹, Kevin Dhamo², Michael Ruppel², Norbert Jux², Bernd Meyer², and •Sabine Maier¹ — ¹Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany — ²Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany

We demonstrate the surface-assisted transformation of porphyrin-based precursor molecules into bowl-shaped nanographenes through cyclization reactions on an Au(111) surface. The structures are visualized by scanning probe techniques with submolecular resolution, directly revealing intramolecular bonding and compared to density-functional theory calculations. Distinct configurations that suggest bowl-to-dome inversion are identified on the surface. Additionally, we report the accompanying metallation of the macrocycle with Au substrate adatoms. This combination of porphyrin and nanographene with a periphery solely consisting of six-membered all-carbon rings might serve as a seed for growing porphyrin-doped graphene sheets.

Keywords: scanning tunneling microscopy; on-surface synthesis; nanographene; porphyrin