Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 62: Focus Session Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation III
O 62.9: Talk
Wednesday, March 19, 2025, 12:45–13:00, H24
Incorporating Nonhexagonal Polygons into Carbon-Based Nanostructures via On-Surface Synthesis — •Dong Han1, Jakob Schramm2, Zilin Ruan1, Tim Naumann1, Konstantin Y. Amsharov3, Ralf Tonner-Zech2, and J. Michael Gottfried1 — 1Department of Chemistry, Philipps-Universität Marburg, Marburg, Germany — 2Faculty of Chemistry and Mineralogy, Wilhelm Ostwald Institute for Physical and Theoretical Chemistry, Universität Leipzig, Leipzig, Germany — 3Institute of Chemistry, Organic Chemistry, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
The incorporation of nonhexagonal rings offers a powerful strategy for designing novel carbon-based nanostructures with unique physicochemical properties. Herein, we report the on-surface synthesis of: (1) Quasi-planar, furan-containing cycloparaphenylenes (CPPs): Synthesized via Ullmann coupling and cyclodehydrogenation on Au(111), these CPPs show a decreasing energy gap with increasing size. Orbital confinement at edges and pores is observed, which is associated with the slower wave function decay above the CPP plane. (2) Carbon nanoribbons (CNRs) embedded with nonbenzenoid rings: Zigzag nanoribbons bearing 5-6-7 membered rings and linear nanoribbons containing 4-5-6-8 carbon polygons are formed through the lateral fusion of polymer chains on Au(111). Low-temperature scanning tunneling microscopy/spectroscopy (STM/STS) reveals their geometric and electronic properties, and X-ray photoelectron spectroscopy (XPS) unravels the reaction process.
Keywords: on-surface synthesis; nonhexagonal polygons; scanning tunneling microscopy; geometric and electronic structures; carbon-based Nanostructures