Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 18: Poster Session I - MA 141/144 (Atomic Wires; Size-Selected Clusters; Nanostructures; Metal Substrates: Clean Surfaces+Adsorption of Organic / Bio Molecules+Solid-Liquid Interfaces+Adsorption of O and/or H; Surface or Interface Magnetism; Oxides and Insulators: Clean Surfaces)
O 18.65: Poster
Montag, 25. Februar 2008, 18:30–19:30, Poster F
Comparative study of the structure formation by two different bis(terpyridine)derivates (BTP) on HOPG — •Michael Roos1, Christoph Meier2, Daniel Caterbow2, Harry E. Hoster1, Ulrich Ziener2, and R. Jürgen Behm1 — 1Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany — 2Institute of Organic Chemistry III, Ulm University, D-89069 Ulm, Germany
Depostition of BTP molecules on HOPG by evaporation in UHV or from solution leads to large domains of highly ordered structures, which are stabilized by C-H···N type hydrogen bonds [1-3]. The energetically most favorable molecule-molecule configuration can be modified by varying the position of the N-atoms within the BTP molecules. Furthermore, depending on the deposited amount and the deposition conditions (solvent and concentration), a large variety of ordered structures is obtained. The possibility to describe these structures as a sum of localized molecule-molecule and molecule-substrate interactions is discussed. In addition, the role of dynamic effects like molecule mobility and rotation for the stability of the different phases is considered.
1. H. E. Hoster et al., Langmuir 23, 11570 (2007).
2. A. Breitruck et al., Surf Sci 601, 4200 (2007).
3. C. Meier et al., J Phys Chem B 109, 21015 (2005).