Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 8: Focus Session Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation I
O 8.9: Vortrag
Montag, 17. März 2025, 12:45–13:00, H24
On-surface synthesis of drone-shaped oligomers via carbenes — •Yunjun Cao1, Joel Mieres-Perez2, Julien Frederic Rowen3, Akshay Hemant Raut3, Paul Schweer1, Wolfram Sander3, Elsa Sanchez-Garcia2, and Karina Morgenstern1 — 1Physical Chemistry I, Ruhr-Universität Bochum, D-44801 Bochum, Germany — 2Lehrstuhl Physikalische Chemie I, NC 5/72, Ruhr-Universität Bochum, 44801, Bochum — 3Organic Chemistry II, Ruhr-Universität Bochum, D-44801 Bochum, Germany
The development of on-surface synthesis strategies opens opportunities to fabricate sophisticated nanostructures with tailored geometries, symmetries, and other properties. Here, we demonstrate that carbenes can be used as building blocks for fabricating highly branched oligomers with different symmetries on a Ag(111) surface. We synthesize highly symmetric drone-shaped oligomers, which are formed via C=C coupling of two carbenes to create a core, followed by C-H activation of the core with additional carbenes to create branches. Less symmetric drone-shaped oligomers are formed through the cyclodehydrogenation of the highly symmetric oligomers. The products are investigated by scanning tunneling microscopy and supported by ab initio theoretical modeling.
Keywords: on-surface synthesis; carbene; C-H activation; scanning tunneling microscopy