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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications
SYSA 2: Organic Interface Structure and Growth
SYSA 2.4: Talk
Tuesday, February 26, 2008, 11:45–12:00, H 0105
X-ray standing wave study of pentacene and perfluorinated pentacene on Cu(111) — •A. Gerlach1, F. Schreiber1, S. Duhm2, N. Koch2, A. Vollmer3, T. Suzuki4, and J. Zegenhagen5 — 1Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany — 2Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany — 3Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung, Albert-Einstein-Str. 15, 12489 Berlin, Germany — 4Institute for Molecular Science, Myodaiji, Okazaki 444-8787, Japan — 5European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, BP 220, 38043 Grenoble Cedex 9, France
The adsorption geometry of pentacene (PEN) and perfluorinated pentacene (PFP) on Cu(111) is studied using the X-ray standing wave technique. The element specific structural information derived from the C(1s)and F(1s) photoelectron signals demonstrate the different bonding mechanism of both molecules.
While PEN interacts strongly with the copper substrate and adsorbs with an average bonding distance of only 2.34 ± 0.02 Å, the carbon core of the PFP molecule is located at 2.98 ± 0.07 Å. Despite the relatively weak interaction of PFP with the substrate the molecules experience a mild distortion upon adsorption with the fluorine atoms being slightly above the molecular plane at 3.08 ± 0.04 Å. Based on the XSW results we discuss the influence of the intramolecular dipole on the charge transfer across the interface.