Regensburg 2010 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)
O 59.93: Poster
Mittwoch, 24. März 2010, 17:45–20:30, Poster B1
Impact of central metal atoms and F-substituents on the adsorption geometry of phthalocyanine molecules on Cu(111) — •Christoph Bürker1, Takuya Hosokai1, Alexander Gerlach1, Steffen Duhm2, Norbert Koch3, Hiroyuki Yamane4, and Frank Schreiber1 — 1Universität Tübingen — 2Chiba University — 3HU Berlin — 4Institut for Molecular Science
The adsorption geometry of large organic molecules on metal surfaces is essential for understanding and controlling the interface electronic structure, thin film structure and growth mechamism. The X-ray standing wave (XSW) technique is one of the most precise methods to determine the vertical positions of specific atoms relative to the substrate and can therefore establish the adsorption geometry of organic molecules.
Metal Phthalocyanines (MPc) as typical organic semiconductors are one of the most suitable systems for XSW experiments due to their chemical stability, high structural symmetry and variability of both the central metal atom and substituents. Using the XSW technique we show how fluorination and a central metal atom affect the adsorption geometry of Pc molecules. We compare the structural differences of metal-free Pc (H2Pc), zinc-Pc (ZnPc) and perfluorinated ZnPc (F16ZnPc) on Cu(111). The XSW data reveal significant deviations for both the bonding distance and molecular distortion. These results indicate an interaction strength of each atom with the surface depending on its chemical vicinity.