Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 81: Poster Focus Session: Molecular Nanostructures on Surfaces - New Concepts towards Complex Architectures
O 81.7: Poster
Mittwoch, 14. März 2018, 18:15–20:30, Poster A
Resolving intramolecular-distortion changes induced by the partial fluorination of pentacene adsorbed on Cu(111) — •Antoni Franco-Cañellas1, Qi Wang1,2, Katharina Broch1, Bin Shen2, Alexander Gerlach1, Holger F. Bettinger2, Steffen Duhm3, and Frank Schreiber1 — 1Institut für Angewandte Physik, Universität Tübingen, Germany — 2Institut für Organische Chemie, Universität Tübingen, Germany — 3Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, People’s Republic of China
We experimentally quantify the molecular bending of the partially-fluorinated pentacene (PEN) compound 2,3,9,10-tetrafluoropentacene (F4PEN) adsorbed on Cu(111). By means of the X-ray standing wave (XSW) technique, we directly measure the adsorption distance of three inequivalent carbon species, the fluorine atoms, as well as the total and backbone carbon average adsorption distances. This allows us to resolve two adsorption behaviors, namely, a PEN-like strong coupling between the backbone and the substrate and a repulsive interaction involving the fluorinated short molecular edges, which are 0.9 Å above the central benzene ring. This finding is further supported by additional ultraviolet photoelectron spectroscopy and low-energy electron diffraction measurements, thus showing that the selective fluorination of a PEN molecule has only a local conformational effect and it is not enough to modify its interface properties.