Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 15: Postersitzung (Adsorption an Oberfl
ächen, Epitaxie und Wachstum, Organische Dünnschichten, Oxide und Isolatoren, Rastersondentechniken, Zeitaufgelöste Spektroskopie, Methoden)
O 15.17: Poster
Freitag, 4. März 2005, 17:00–20:00, Poster TU D
Adsorption and Surface Mobility of Cinchonidine on Pt(111) studied by STM — •Markus Wahl1, Matthias von Arx1,2, Thomas A. Jung1,3, and Alfons Baiker2 — 1Institute of Physics University of Basel, Switzerland — 2Department of Chemistry and Applied Biosciences, ETH Zürich, Switzerland — 3Paul-Scherrer Institute, Villigen, Switzerland
The investigation of complex organic molecules on metal surfaces by scanning probe microscopies has become a topic of great interest. Most of this research has been focussed on rather unreactive metal surfaces. Here we report [1] on the adsorption of cinchonidine (CD) on Pt(111) in the presence and absence of hydrogen. This investigation is of particular interest due to its relevance to asymmetric heterogeneous catalysis [2].
The time resolved studies revealed that the CD molecules are immobile at low hydrogen pressure, whereas considerable mobility was observed at higher hydrogen pressure. Based on different adsorption geometries and surface mobility different species could be distinguished.
[1] Matthias von Arx et al., Phys. Chem. Chem. Phys., 2005, 7, Advance Article
[2] A. Baiker, H.-U. Blaser in Handbook of Heterogeneous Catalysis, VCH, Weinheim 1997, Vol. 5, 2422.