Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 35: Poster Session I (Metal, semiconductor and oxide substrates: structure and adsorbates; Graphene)
O 35.28: Poster
Tuesday, March 12, 2013, 18:15–21:45, Poster B1
Electrospray deposition of functionalized platform molecules on Au(111) — Kristof Buchmann1, •Nadine Hauptmann1, Christian Hamann1, Sandra Ulrich2, Franziska Otte2, 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 electronic coupling to a metal substrate may affect the electronic and geometric structure of molecules. To preserve the intrinsic properties of molecules it is desirable to decouple the functional groups from the substrate. Partial decoupling 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 triazatriangulenium (TATA) and the trioxotriangulenium (TOTA) platform molecule with various functional groups. The preparation of adlayers of these molecules by thermal sublimation is not feasible due to their thermal instability. We therefore use a home-built electrospray ionization setup for depositing the molecules onto Au(111) in ultra-high vacuum. The observed tunneling spectra are in good agreement with calculated spectra of the respective gas-phase molecules. This proves the electronic decoupling of the functional groups from the substrate. Financial support by the Deutsche Forschungsgemeinschaft via the SFB 677 is gratefully acknowledged.