Dresden 2009 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
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 42.54: Poster
Mittwoch, 25. März 2009, 17:45–20:30, P2
Substrate Effect in the structure of ordered Bis-terpyridine monolayer networks — •Thomas Waldmann1, Daniela Künzel2, Harry E. Hoster1, Axel Groß2, and R. Jürgen Behm1 — 1Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany — 2Institute of Theoretical Chemistry, Ulm University, D-89069 Ulm, Germany
We present different supramolecular networks formed by monolayers of a Bis-terpyridine derivative (2,4’-BTP)[1,2] on the (100) and (111) surfaces of Ag and Au. On all four substrates, ordered and disordered structures are observed by STM and LEED under UHV conditions at T = 300 K and at 90 K. On Ag(111) and Au(111) surfaces, single 2,4’-BTP molecules are observed in 12 different orientations with 30∘ difference. This is explained by a best fit of the molecules to the substrate, maximizing the number of N atoms being adsorbed a-top of substrate atoms [3,4]. This simple model fully explains the resulting molecular networks on Ag(111) and Au(111). Its suitability for rationalizing monolayer networks on the (100) surfaces of Ag and Au is tested.
U.Ziener et al., Chem.Eur.J. 8, 951, 2002
C. Meier et al., J.Phys.Chem.B 109, 21015, 2005
H.E. Hoster et al., Langmuir 23, 11570, 2007
M.Roos et al., Phys. Chem. Chem. Phys. 9, 5672, 2007