Regensburg 2022 – scientific programme
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DS: Fachverband Dünne Schichten
DS 20: Poster
DS 20.19: Poster
Wednesday, September 7, 2022, 16:00–18:00, P3
Reaction of Tetrapyrrole Thin Films with Alkali Metals — •Leonard Neuhaus1, Stefan Renato Kachel1, Peter Schweyen2, Mark Hutter1, Maik Schöniger1, Florian Münster1, Lukas Ruppenthal1, Jan Herritsch1, Marie-Irene Albus1, Martin Bröring2, and J. Michael Gottfried1 — 1Fachbereich Chemie, Philipps-Universität Marburg, Germany — 2Institut für Anorganische und Analystische Chemie, Technische Universität Braunschweig, Germany
Tetrapyrroles such as porphyrins play an import role in living organism and for various modern technologies. While most previous publications related to tetrapyrrole thin films focus on transition metal complexes, we want to expand the field by exploring the reaction of various tetrapyrrole films with alkali metals. For this purpose, we prepared multilayer films of tetraphenylporphyrin and an octaalkylcorrol on a Au(111) surface and studied their reactions with Li and Cs, thus covering the extremes of the lightest and heaviest stable alkali metal. For all studied systems, X-ray photoelectron spectroscopy (XPS) showed, changes in the N 1s region that indicate formation of the corresponding tetrapyrrole metal complexes. Complementary studies with temperature programmed reaction (TPR) provided unambiguous mass spectrometric evidence for the formation of the metal complexes. TPR also showed that the number of alkali metal atoms attached to a tetrapyrrole ligand can exceed the number of pyrrolic hydrogen atoms in the free-base tetrapyrrole.