Berlin 2008 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 4: Nanostructures at Surfaces

O 4.1: Vortrag

Montag, 25. Februar 2008, 11:15–11:30, MA 042

Dynamic processes in metalorganic networks based on oligopyridines and copper — •Achim Breitruck¹, Harry E. Hoster¹, Christoph Meier², Ulrich Ziener², and R. Jürgen Behm¹ — ¹Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm — ²Institute of Organic Chemistry III, Ulm University, D-89069 Ulm

We report on the dynamics of chiral metalorganic networks on the basis of Bis-terpyridines (BTP) and copper which were studied by time-resolved scanning tunneling microscopy (STM). Using highly oriented pyrolytic graphite (HOPG) as substrate, the samples were prepared by vapor deposition of oligopyridines to form a quadratic 2D molecular network^[1] and post-deposition of copper under ultra high vacuum (UHV) conditions. At Cu coverages below phase saturation, we observed the formation of an Cu-organic network, consisting of copper-free and copper-containing BTP trimers. At room temperature, this allows the migration of Cu atoms within the network via a hopping mechanism from Cu-containing to Cu-free trimers on a timescale of seconds. The mechanism is accompanied by a local rearrangement of the BTP molecules. Despite the high adlayer dynamics, we find very large enantiopure domains with sizes > 10⁴ nm².

[1] H.E. Hoster et al., Langmuir 23, 11570-11579, (2007)

[2] A. Breitruck et al., Surf. Sci. 601, 4200-4205, (2007)