Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 22: Poster Surface Reactions
O 22.5: Poster
Montag, 17. März 2025, 18:00–20:00, P2
Self-assembly and reactions of benzonitriles on metal surfaces — •Anran Bao1 and Wenshao Yang2 — 1Physikalische Chemie I, Ruhr-Universität Bochum, Bochum, Germany — 2Hangzhou Institution of Advanced Studies, Hangzhou,China
Surface synthesis enables innovative material design, with the self-assembly of organic molecules on metal surfaces. Among on-surface reactions, the Ullmann coupling is significant. Notably, despite the considerable differences in the chemical structures of cyanides and halogen atoms, they exhibit similarities in organic reactions. This provides a new perspective on surface synthesis and possibilities for synthesizing novel nanomaterials. This study focuses on the unique self-assembly and chain formation of benzonitrile derivatives, particularly iso-phthalonitrile (IPN), tere-phthalonitrile (TPN) and ortho-phthalonitrile (OPN), on the Co(0001) surface. We observed that IPN and TPN molecules adsorb randomly at room temperature using Scanning Tunneling Microscopy. However, these molecules undergo significant transformations upon annealing, forming chain-like structures. OPN forms disordered chains at room temperature, which become more linear and ordered upon heating. Compared to Au(111) and Ag(111), where simpler self-assemblies or dimers form, Co(0001) uniquely enables complex, ordered chain formation. This work provides critical insight into the catalytic properties of cobalt, enhancing understanding of molecular assembly on metal surfaces and offering new directions for designing nanostructured materials with precise molecular ordering.
Keywords: STM; benzonitrile derivatives; metal surfaces