Dresden 2026 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 87: Solid-liquid interfaces: Structure, spectroscopy
O 87.1: Vortrag
Donnerstag, 12. März 2026, 15:00–15:15, TRE/PHYS
Interfacial Enrichment and Reactivity of Organic Molecules in Ionic Liquids — •Alisson Ceccatto Santos1, Luciano Sanchez Merlinsky2,3, Luis M. Baraldo2,3, Federico J. Williams2,3, Florian Maier1, and Hans-Peter Steinrück1 — 1Lehrstuhl für Physikalische Chemie 2, Friedrich-Alexander-Universität Erlangen-Nürnberg — 2Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires — 3Instituto de Química Física de los Materiales, Medio Ambiente y Energía, CONICET- Universidad de Buenos Aires
Controlling the surface composition of metalloporphyrins in ionic liquids (ILs) is crucial for designing photoactive materials. Here, we investigate the interfacial behavior of zinc-didodecylporphyrin molecules (Zn-DDP) dissolved in the 1-butyl-3-methylimidazolium hexafluorophosphate [C4C1Im][PF6] IL using angle-resolved X-ray photoelectron spectroscopy (ARXPS). Upon mild heating, Zn-DDP undergoes spontaneous demetallation, evidenced by the appearance of aminic (-NH-) and iminic (=N-) nitrogen XPS signals. Our measurements reveal extremely high surface enrichment of porphyrins at the IL/vacuum interface, with the dodecyl chains oriented toward the vacuum. ARXP spectra reveal that the surface enrichment increases with increasing temperature. Our findings provide molecular-level insights to guide the design of photoactive interfaces in IL systems. Acknowledgements: Alexander von Humboldt Foundation for a Humboldt Research Fellowship for postdocs
Keywords: Ionic Liquids; Surface Enrichment; Catalysis; Angle-resolved XPS; Interfacial design