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O: Fachverband Oberflächenphysik
O 6: Organic molecules on inorganic substrates: Adsorption and growth I
O 6.1: Vortrag
Montag, 9. März 2026, 10:30–10:45, TRE/PHYS
Support-dependent reactivity of Fe-DCA 2D Metal-Organic Frameworks — •Dominik Hrůza1, Zdeněk Jakub1, Jakub Planer1, Tadeáš Lesovský2, Ayesha Jabeen1, Pavel Procházka1, and Jan Čechal1,2 — 1CEITEC - Central European Institute of Technology, Brno University of Technology, Purkyňova 123, Brno 61200, Czechia — 2Institute of Physical Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, Brno 61200, Czechia
2D Metal-Organic Frameworks (2D MOFs) are promising materials for applications in catalysis, sensing and spintronics. 2D MOFs based on 9,10-dicyanoanthracene (DCA) linker molecules are particularly intriguing due to their recently demonstrated magnetic and topological properties. Here, we study the reactivity of Fe-DCA supported on two weakly-interacting supports: graphene/Ir(111) and Au(111). Using Scanning Tunneling Microscopy (STM), X-Ray Photoemission Spectroscopy (XPS) and Low-Energy Electron Microscopy/Diffraction (LEEM/LEED), we test how the Fe-DCA reacts with carbon monoxide and molecular oxygen. When the Fe-DCA is supported on graphene, the CO adsorbs on the Fe-sites at temperatures below 200 K, while O2 exposure causes structural collapse of the 2D MOF at room temperature. In contrast, when the Fe-DCA is supported on Au(111), it appears inert to CO adsorption. Overall, our results show how the chemical reactivity of 2D MOFs depends on the supporting surface, providing critical insights for the potential integration of MOFs into functional devices.
Keywords: 2D Metal-Organic Frameworks; CO adsorption; Fe-DCA; Thermal and chemical stability; Single-Atom Catalysis