Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 31: Focus Session Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation II
O 31.9: Vortrag
Dienstag, 18. März 2025, 12:45–13:00, H24
Temperature Induced Ring-Opening Polymerization Reaction for the Synthesis of Carbon Nanoribbons: Strain Influence on the On-surface Synthesis Using [6], [8]-, and [10]Cycloparaphenylenes — •Miguel Wiche1, Qigang Zhong2, Daniel Kohrs1, Qitang Fan3, J. Michael Gottfried4, Daniel Ebeling1, Hermann A. Wegner1, and André Schirmeisen1 — 1Justus Liebig University Giessen, Germany — 2Soochow University, Suzhou, China — 3University of Science and Technology of China, Hefei, China — 4Philipps University Marburg, Germany
As the on-surface synthesis is an emerging reseach field, there is a lack of general understanding of reaction mechanisms, compared to conven- tional organic synthesis. Therefore, comprehensive research studies are required to figure out basic principles in the on-surface reaction mech- anisms of organic molecules. In this work we investigate the strain influence of a set of Cycloparaphenylenes (CPP) in the temperature in- duced on-surface synthesis of biphenylene and graphene nanoribbons, using a strain induced ring opening polymerization (ROP) reaction. The decisive step of the polymerization, the ring opening, is found to strongly depend on the ring size and strain of the CPP molecules. Our work suggests that using smaller, highly strained rings, instead of rings with increasing number of phenyl units facilitates the ROP and nanoribbon formation.
Keywords: On-surface Synthesis; Graphene Nanoribbons; Low-temperature AFM/STM; Chemical Bond Imaging