Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 87: Focus Session: Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation III
O 87.10: Vortrag
Donnerstag, 21. März 2024, 17:30–17:45, HE 101
A temperature-programmed X-ray photoelectron spectroscopy study of a halogenated porphyrin on Au(111) and Cu(111) — •Michael Clarke1, Eleanor Frampton2, Matthew Edmondson1, Ailish Gray1, Jonathan Bradford1, and Alex Saywell1 — 1School of Physics & Astronomy, University of Nottingham, UK — 2MAX IV Laboratory, Lund, Sweden
Halogenated porphyrins on metallic surfaces undergo a variety of reactions when heated, such as Ullmann-type coupling, ring-closing, metalorganic coordination, and self-metalation. These reactions are influenced by various factors, including porphyrin and substrate chemistry.[1] Porphyrins are of interest as precursor monomers in on-surface assembly, due to their tuneable optoelectronic and gas absorption properties.[2] Here, we detail the reaction of a brominated porphyrin (BrxTPP) on Au(111) and Cu(111), via near edge X-ray absorption fine structure (NEXAFS), X-ray photoelectron spectroscopy (XPS) and scanning tunnelling microscopy (STM). Building upon our previous work, [3,4] temperature programmed XPS (TP-XPS) provides a detailed characterisation of the molecular structure to be obtained as the reaction progresses. The chemistry, orientation, and conformation of the porphyrins is explored.
[1] L. Grill, S. Hecht, Nat. Chem. 12, 115 (2020) [2] E. Vesselli, J. Phys. Mater. 3, 022002 (2020) [3] M. Edmondson, E.S. Frampton, C.J. Judd, N.R. Champness, R.G. Jones and A. Saywell, Chem. Commun., 2022, 58, 6247. [4] E.S. Frampton, M. Edmondson et al., Inorganica Chim. Acta, 558, 121718, (2023)
Keywords: Porphyrin; On-Surface Synthesis; XPS; STM; NEXAFS