Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 30: Metal substrates: Adsorption of organic / bio molecules IV
O 30.2: Vortrag
Mittwoch, 25. März 2009, 10:45–11:00, SCH A118
Reactions on surfaces for the creation of template structures — •Meike Stöhr1, Manfred Matena1, Markus Wahl1, Thomas A. Jung2, Jörg Zegenhagen3, and Lutz H. Gade4 — 1University of Basel, Switzerland — 2Paul-Scherrer-Institute, Switzerland — 3ESRF Grenoble, France — 4University of Heidelberg, Germany
Molecular assemblies on surfaces can be used as templates that allow the study of host guest interactions and provide in a further step an ideal starting point for the generation of more complex hierarchic structures. An important prerequisite besides the regularity of such structures is their stability. We reported the formation of a molecular honeycomb network generated by thermal dehydrogenation of a perylene derivative (DPDI) on a Cu(111) surface [1]. By thermal activation, these molecules become H-bond donors/acceptors and form a highly regular honeycomb structure which is commensurate to the Cu substrate. This network can be used as a template for the incorporation of guest molecules in its hexagonal 'holes' [2]. In addition, XSW (x-ray standing wave) experiments were carried out to determine the height of the DPDI molecules above the Cu surface before and after annealing the sample. It turned out that for the not annealed sample the DPDI molecules mainly interact through their amine end groups with the substrate while the molecule is in a bridge-like configuration. After annealing, the height difference between the end groups and the perylene core is lowered what is required to enable H-bonding between the molecules. [1] M. Stöhr et al., Angew. Chem. Int. Ed. 44 (2005) 7394 [2] M. Stöhr et al., Small 3 (2007) 1336