Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)
O 42.41: Poster
Mittwoch, 25. März 2009, 17:45–20:30, P2
Two dimensional structure formation controlled by metal-ligand interactions — •Achim Breitruck, Harry E. Hoster, and R. Jürgen Behm — Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm
Using highly oriented pyrolytic graphite (HOPG) as substrate, two dimensional structure formation of bisterpyridine (BTP) molecules in the presence of metal atoms was studied by scanning tunnelling microscopy (STM) under ultrahigh vacuum (UHV) conditions. BTP molecules form highly ordered networks stabilized by C-H⋯N type hydrogen bonds. [1,2] Upon metal deposition (Ag, Cu), these hydrogen bonds are partially lifted in favour of metal⋯N-pyridine interactions. This results in new network structures that strongly depend on the metal-to-molecule ratio. Surprisingly, we find the same sequence of metal coverage dependent structures for Ag and Cu addition, while theory predicts the Cu⋯N-pyridine interaction to be about 3 times stronger than the Ag⋯N-pyridine interaction.[3]Possible reasons for this will be discussed.
[1] H.E. Hoster et al., Langmuir 23, (2007),11570-11579.
[2] A. Breitruck et al., Surf. Sci. 601, (2007), 4200-4205.
[3] D.Y. Wu et al., J. Chem. Phys 118, (2003), 4073-4085.