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O: Fachverband Oberflächenphysik

O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory

O 36.9: Poster

Dienstag, 1. April 2014, 18:30–22:00, P1

STM of functionalized platform molecules on Au(111) — •Torben Jasper-Tönnies¹, Sandra Ulrich², Rainer Herges², and Richard Berndt¹ — ¹Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel — ²Otto- Diels-Institut für Organische Chemie, Christian-Albrechts-Universität zu Kiel

The coupling to a metal substrate affects the electronic and geometric structure of molecules. To preserve their intrinsic properties it may be desirable to decouple functional groups from the substrate. This can be achieved by supporting a molecule by a molecular platform, conceivably via a spacer group. Using low temperature scanning tunneling microscopy we investigate the trioxotriangulenium (TOTA) platform molecule with various functional groups. In contrast to the similar platform molecule triazatriangulenium (TATA), functionalized TOTA can be thermally evaporated due to its higher thermal stability. Depending on the functional groups attached to the TOTA molecules we observe varying degrees of fragmentation. This will be discussed in terms of electronic properties of the functional groups. Financial support by the Deutsche Forschungsgemeinschaft via SFB 677 is gratefully acknowledged.