Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 12: Inorganic/Organic Interfaces: Growth II
O 12.10: Talk
Monday, March 16, 2015, 17:15–17:30, MA 005
Spectroscopic investigation of free base and Manganese 5,10,15-tris(pentafluorophenyl)corrole on Ag(111) — Mateusz Paszkiewicz1, •Stefan Müllegger2, Uwe Gerstmann4, Hazem Aldahhak4, Eva Rauls4, Stefano Tebi2, Wolfgang Schöfberger3, Wolf Gero Schmidt4, Reinhold Koch2, Johannes Barth1, and Florian Klappenberger1 — 1TUM, Physik department E20,Garching, Germany — 2JKU, Solid state physics department, Linz, Austria — 3JKU, Institute of organic chemistry, Linz, Austria — 4University of Paderborn, Physik department, Paderborn, Germany
In our work we present the first X-ray spectroscopic investigation of free base 5,10,15-tris(pentafluorophenyl)corrole (TPFC) and manganese 5,10,15-tris(pentafluorophenyl)corrole (MnTPFC) on the Ag(111) surface. Our study is based on X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine-structure (NEXAFS) spectroscopy measurements and combined with density functional theory (DFT) simulations. For both species we characterized all relevant regions and edges. Our analysis indicates a mixed 3+/4+ state of the Mn inside the MnTPFC. Furthermore, polarization-dependent NEXAFS measurements indicate for both molecules a low degree of order in the multilayer. In contrast, the first monolayers in contact with the silver substrate adsorb highly ordered, with the tetrapyrrolic macrocycle almost parallel to the surface, the residual tilt being ca. 20°. The three pentafluorophenyl groups are tilted by ~45° with respect to the surface.