Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Organic molecules on inorganic substrates: Adsorption and growth II

O 35.4: Vortrag

Dienstag, 10. März 2026, 11:15–11:30, HSZ/0401

TPD/R Investigations of Metal-Substrate Interactions of Polyfluorinated Molecules on Au(111) — •Stefan R. Kachel, Evelyn Versok, Leonard Neuhaus, Kassandra Zoltner, and J. Michael Gottfried — Fachbereich Chemie und mar.quest, Philipps-Universität Marburg, Germany.

Interfaces between organic molecules and metal surfaces are crucial in heterogeneous catalysis, organic electronics, and related nanotechnological and sensing applications. Molecules with large dipole moments are particularly relevant, as dipole enhancement through tailored fluorination can strongly influence adsorption geometries, adsorbate-substrate interactions, and thus the electronic properties of molecule-metal interfaces. Among nonionic, saturated compounds, all-cis-hexafluorocyclohexane (HFCH) exhibits the highest known polarity (μ = 6.2 D). Here, we use temperature-programmed desorption and reaction (TPD/R) to investigate the desorption kinetics and energetics of HFCH and two reference compounds, perfluoromethylcyclohexane and cyclohexane, on Au(111). The polar HFCH shows markedly stronger interactions with the substrate than the two reference compounds, and all systems display desorption behavior that deviates substantially from structurally related aromatic species. The pronounced polarity and stacked packing motif of HFCH render it a promising model system for studies in supramolecular chemistry and organic materials research, including potential applications in organic ion-conducting materials.

Keywords: TPD; Intramolecular Dipole; Organic Fluorinated Compounds; Organic-Metal Interactions; Metal substrates