Regensburg 2007 – scientific programme
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O: Fachverband Oberflächenphysik
O 58: Metal Substrates: Adsorption IV
O 58.8: Talk
Thursday, March 29, 2007, 17:30–17:45, H39
Conformational switching in the self assembling process of azobenzene on Au(111) — •Nils Henningsen1, Katharina Jennifer Franke1, Isabel Fernandez-Torrente1, Gunnar Schulze1, Beate Priewisch2, Karola Rück-Braun2, and José Ignacio Pascual1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Germany — 2Institut für Chemie, Technische Universität Berlin, Germany
Here we present low temperature scanning tunneling microscopy studies of 3,3'-Carboxymethylester-Azobenzene (CMA) adsorbed on a Au(111) surface. Two different adsorption geometries are observed, which differ from each other by the rotation of one phenylene ring. The two CMA isomers selectively assemble in two different structures: highly ordered densely packed islands and chains of interlocked molecules. Both molecular structures are stabilised by hydrogen bonds. The ratio of the two conformers has been studied dependently of coverage and adsorption temperature and shows that the selective assembly is not only influenced by conformational recognition during diffusion processes but furthermore by conformational changes while assembling. This proves that intra-molecular conformational dynamics can govern self assembly processes.