Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 66: Poster: Nanostructures at Surfaces
O 66.19: Poster
Mittwoch, 20. März 2024, 18:00–20:00, Poster C
Structural Characterisation via X-ray Standing Wave Analysis: Reactions of Tetraphenyl Porphyrin — •Eleanor S. Frampton1, Chris J. Judd2, Matthew Edmondson2, David A. Duncan3, Robert G. Jones2, and Alex Saywell2 — 1MAX IV Laboratory, Lund, Sweden — 2School of Physics, University of Nottingham, UK — 3Diamond Light Source, UK
Surface-confined reactions offer alternative synthetic pathways to solution-based chemistry and can be studied with a range of techniques to gain deep insights into the on-surface processes taking place during the chemical reaction. By employing a variety of analysis methods a route to understanding and characterizing the mechanistic details of these processes becomes available. This insight provides the tools required to potentially control the selectivity and efficiency of these reactions as well as to design systems with specific functionality.
Here I will focus on how the NIXSW technique can be utilized in combination with STM and XPS. The example system of tetraphenyl porphyrin (TPP) on Au(111) is used to describe how the combination of these methods can lead to a detailed model of an on-surface system, including adsorption geometries of individual molecules. This system consists of three distinct phases, resulting from consecutive on-surface reactions. The chemical specificity of XPS and NIXSW afford us insight into the chemical and structural changes exhibited by the nitrogen atoms within the TPP molecule at each reaction stage. [1,2]
[1] Woodruff, D. P. (2005), Rep. Prog. Phys., 68(4), 743 [2] Frampton, E. S....& Saywell, A. (2023), Inorg. Chim. Act., 558, 121718
Keywords: Surface Science; Porphyrins; X-ray Spectroscopy; X-ray Standing Wave; Scanning Probe