Multi-Orbital Charge Transfer into Nonplanar Cycloarenes Revealed with CO-Functionalized Tips
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Haags, Anja Reichmann, Alexander Ruan, Zilin Fan, Qitang Egger, Larissa Kirschner, Hans Naumann, Tim Werner, Simon Kleykamp, Olaf Martinez-Castro, Jose Lüpke, Felix Bocquet, François C. Kumpf, Christian Soubatch, Serguei Gottwald, Alexander Koller, Georg Ramsey, Michael G. Richter, Mathias Sundermeyer, Jörg Puschnig, Peter Gottfried, J. Michael Tautz, F. Stefan Wenzel, Sabine |
| author_facet | Haags, Anja Reichmann, Alexander Ruan, Zilin Fan, Qitang Egger, Larissa Kirschner, Hans Naumann, Tim Werner, Simon Kleykamp, Olaf Martinez-Castro, Jose Lüpke, Felix Bocquet, François C. Kumpf, Christian Soubatch, Serguei Gottwald, Alexander Koller, Georg Ramsey, Michael G. Richter, Mathias Sundermeyer, Jörg Puschnig, Peter Gottfried, J. Michael Tautz, F. Stefan Wenzel, Sabine |
| contents | On-surface synthesis has allowed for the tuneable preparation of numerous molecular systems with variable properties. Recently, we demonstrated the highly selective synthesis of kekulene (>99%) on Cu(111) and isokekulene (92%) on Cu(110) from the same molecular precursor (Ruan et al., Angew. Chem. Int. Ed. 2025, e202509932). Scanning tunneling microscopy with CO-functionalized tips can identify the single molecules on the basis of their geometric structure at a low coverage on Cu(110), but it also detects complex features due to electronic contributions close to the Fermi energy. Here, we investigate the origin of these features by simulating STM images based on a weighted sum of multiple molecular orbitals, for which we employ weights based on the calculated molecular-orbital projected density of states. This allows for an experimental confirmation of charge transfer from the surface into multiple formerly unoccupied molecular orbitals for single molecules of kekulene as well as isokekulene in its two nonplanar adsorption configurations. In comparison, the area-integrating photoemission orbital tomography technique confirms the charge transfer as well as the high selectivity for the formation of a full monolayer of mainly isokekulene on Cu(110). Our STM-based approach is applicable to a wide range of adsorbed molecular systems and specifically also suited for strongly interacting surfaces, nonplanar molecules, and such molecules which can only be prepared at extremely low yields. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_00736 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Multi-Orbital Charge Transfer into Nonplanar Cycloarenes Revealed with CO-Functionalized Tips Haags, Anja Reichmann, Alexander Ruan, Zilin Fan, Qitang Egger, Larissa Kirschner, Hans Naumann, Tim Werner, Simon Kleykamp, Olaf Martinez-Castro, Jose Lüpke, Felix Bocquet, François C. Kumpf, Christian Soubatch, Serguei Gottwald, Alexander Koller, Georg Ramsey, Michael G. Richter, Mathias Sundermeyer, Jörg Puschnig, Peter Gottfried, J. Michael Tautz, F. Stefan Wenzel, Sabine Chemical Physics Materials Science On-surface synthesis has allowed for the tuneable preparation of numerous molecular systems with variable properties. Recently, we demonstrated the highly selective synthesis of kekulene (>99%) on Cu(111) and isokekulene (92%) on Cu(110) from the same molecular precursor (Ruan et al., Angew. Chem. Int. Ed. 2025, e202509932). Scanning tunneling microscopy with CO-functionalized tips can identify the single molecules on the basis of their geometric structure at a low coverage on Cu(110), but it also detects complex features due to electronic contributions close to the Fermi energy. Here, we investigate the origin of these features by simulating STM images based on a weighted sum of multiple molecular orbitals, for which we employ weights based on the calculated molecular-orbital projected density of states. This allows for an experimental confirmation of charge transfer from the surface into multiple formerly unoccupied molecular orbitals for single molecules of kekulene as well as isokekulene in its two nonplanar adsorption configurations. In comparison, the area-integrating photoemission orbital tomography technique confirms the charge transfer as well as the high selectivity for the formation of a full monolayer of mainly isokekulene on Cu(110). Our STM-based approach is applicable to a wide range of adsorbed molecular systems and specifically also suited for strongly interacting surfaces, nonplanar molecules, and such molecules which can only be prepared at extremely low yields. |
| title | Multi-Orbital Charge Transfer into Nonplanar Cycloarenes Revealed with CO-Functionalized Tips |
| topic | Chemical Physics Materials Science |
| url | https://arxiv.org/abs/2509.00736 |