Berlin 2008 – scientific programme

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O: Fachverband Oberflächenphysik

O 34: Metal Substrates: Adsorption of Organic/Bio Molecules II

O 34.11: Talk

Tuesday, February 26, 2008, 16:15–16:30, MA 043

Switching of Spiropyran molecules on a Au(111) surface — •Gunnar Schulze, Michael Karcher, Katharina Franke, Christoph Rüdt, Paul Fumagalli, and Jose Ignacio Pascual — Inst. für Experimentalphysik, Freie Universität Berlin, Berlin, Germany

The photon and electron mediated conversion of the molecule 3-methyl-6-nitro-spiropyran (SP) into its merocyanine isomer were investigated on a Au(111) surface by means of low temperature scanning tunnelling microscopy (STM) and by photo-absorption spectroscopy. STM resolves that the structure of SP molecular assemblies strongly depend on parameters like temperature and molecular density. The electronic properties of SP molecules on a metal surface, as obtained by scanning tunnelling spectroscopy (STS) and by photo-absorption spectroscopy, were compared to the electronic properties in solution. The alignment of these molecular states is specially important when inducing the SP to MC conversion.