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O: Fachverband Oberflächenphysik
O 8: Surface Reactions
O 8.5: Vortrag
Montag, 18. März 2024, 11:30–11:45, MA 141
Surface Chemistry of Porphyrins: Studying Molecular Transformations with XPS and STM — •Eleanor Frampton1, Matthew Edmondson2, Michael Clarke2, Ailish Gray2, and Alex Saywell2 — 1MAX IV Laboratory, Lund, Sweden — 2School of Physics, University of Nottingham, UK
Porphyrin molecules may participate in a number of on-surface reactions [1], the dynamics of which may be influenced by several factors, including temperature, chemistry of the porphyrin species, choice of substrate, etc. Porphyrin molecules themselves are extremely versatile and act as building blocks in the self-assembly of 2D molecular arrays [2], which can be tailored to have specific electronic, optical or catalytic properties. By employing a combination of spectroscopy and imaging techniques, these reactions can be studied in detail. [1-3]
The presentation will focus in particular on the on-surface transformations of trans-Br2TPP on Cu(111). This molecule is known to undergo Ullman coupling, an intramolecular ring closing reaction, and self-metalation on this surface. The stepwise progression of the reaction will be discussed, particularly how these processes can be probed using techniques such as scanning tunnelling microscopy (STM) and x-ray photoelectron spectroscopy (XPS). I detail how these techniques can be complementary when applied to on-surface chemistry. [1] Gottfried, J. M. (2015), Surf. Sci. Rep., 70(3), 259-379.[2] L. Grill, S. Hecht, Nat. Chem. 12, 115*130 (2020) [3] Edmondson, M., Frampton, E.S. * & Saywell, A. (2022), Chem. Commun. 58(42), 6247-6250.
Keywords: Surface Science; Porphyrins; X-ray Spectroscopy; STM