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O: Fachverband Oberflächenphysik

O 23: Poster: Surface Reactions

O 23.5: Poster

Monday, March 27, 2023, 18:00–20:00, P2/EG

On-Surface Reaction of Tetraphenylporphyrin with Caesium — •Leonard Neuhaus, Florian Münster, Kassandra Zoltner, Marie Irene Albus, Jan Herritsch, and J. Michael Gottfried — Fachbereich Chemie, Philipps-Universität Marburg, Germany

Tetrapyrroles such as porphyrins and their metal complexes play important roles in living organisms and for various modern technologies. While the surface chemistry of their transition metal complexes has been well studied in the last decades, the complexes of alkali metals are almost completely unknown. Here, we have studied the reaction of tetraphenylporphyrin (H2TPP) with caesium in the multilayer and monolayer on Ag (111). N 1s X-ray photoelectron spectroscopy (XPS) data indicate complete metalation of the porphyrin in both cases. In complementary temperature-programmed reaction (TPR) experiments performed for the multilayer, the desorbing species were clearly identified by mass spectrometry as Cs2TPP. DFT calculations indicate that this stable complex has a bipyramidal structure with Cs ions on both sides of the molecular plane.