Regensburg 2016 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 35: Thin Film Characterisation: Structure Analysis and Composition II
DS 35.8: Vortrag
Mittwoch, 9. März 2016, 17:00–17:15, H8
Surface chemistry of free-base corrole on Ag(111): Complementary insights from X-ray spectroscopy, DFT and STM. — •Mateusz Paszkiewicz1, Stefano Tebi2, Hazem Aldahhak3, Wolfgang Schöfberger4, Stefan Müllegger2, Uwe Gerstmann3, Eva Rauls3, Wolf Gero Schmidt3, Reinhold Koch2, David Duncan1, Francesco Allegretti1, Johannes Barth1, and Florian Klappenberger1 — 1Physic department, E20, Technische Universität München, Garching, Germany — 2JKU, Solid state physics department, Linz, Austria — 3University of Paderborn, Physik department, Paderborn, Germany — 4JKU, Institute of organic chemistry, Linz, Austria
The investigated fluorophenyl-free base corrole (3H-C) is famous for its ability to act as a three-fold anionic ligand and for stabilizing metals in high oxidation states. Our multitechnic study combines X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption-fine-structure (NEXAFS) spectroscopy with density functional theory (DFT) simulations and scanning tunneling microscopy (STM). First, we present a spectroscopic reference of all relevant regions and edges (C1s, F1, and N1s regions for XPS and C and N K-edge for NEXAFS) of the 3H-C multilayer and interpret their features on the basis of the theoretic investigations. Then, we unravel the influence of the molecule surface interaction. At room temperature we observe unordered layers of partially deprotonated species (2H-C) exhibiting a near-to-planar macrocycle. After annealing to around 400 K, ordered layers of stacked molecules are present with an intriguing spectroscopic signature.