Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 12: Inorganic/Organic Interfaces: Growth II

O 12.10: Vortrag

Montag, 16. März 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.