Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 22: Poster Surface Reactions
O 22.4: Poster
Montag, 17. März 2025, 18:00–20:00, P2
kinetics and thermodynamics of dehalogenation on metal surfaces — •Yu He1, Hao Jiang1, Zhiwen Zhu1, Juan Xiang1, Jinyang Xu2,3,4, Zhaofeng Liang2, Lei Xie2, Fei Song2, and Qiang Sun1 — 1Materials Genome Institute of Shanghai University,Shanghai,China — 2Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai,China — 3Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai,China — 4University of Chinese Academy of Sciences, Beijing,China
In the field of on-surface synthesis, dehalogenative aryl-aryl coupling has become the key strategy for the fabrication of covalently bonded carbon-based nanomaterials. However, studies on the kinetics and thermodynamics of these reactions are still scarce. Also, most of the works focus on debromination while overlooking the dechlorination reaction which is a fundamental reaction with significant implications for environmental protection and sustainable chemistry. Here, we combined synchrotron-based x-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM) to study the dehalogenative polymerization reactions of chlorinated and brominated aromatic hydrocarbons on the Au(111) surface. We resort to high-resolution surface-sensitive techniques to identify the reactants and products as well as the important reaction intermediates. Using the fast XPS, we are able to extract the kinetic curves of the reactions and obtain detailed insight into the reaction process. Our research deepens the understanding of the reaction mechanism.
Keywords: STM; XPS; dehalogenation; kinetics and thermodynamics; surface reaction