Dresden 2014 – scientific programme

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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 36.10: Poster

Tuesday, April 1, 2014, 18:30–22:00, P1

Surface Control of Alkyl Chain Conformations and Chiral Amplification — •Katharina Scheil¹, Nadine Hauptmann¹, Thiruvancheril G. Gopakumar², Franziska L. Otte³, Christian Schütt³, Rainer Herges³, and Richard Berndt¹ — ¹Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany — ²Department of Chemistry Indian Institute of Technology Kanpur, Uttar Pradesh 208 016, India — ³Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany

For alkyl substituents and alkane chains in thin layers on surfaces it was found that adjacent alkyl chains align parallel to each other. We investigated Trioctyl-functionalized triazatriangulenium (TATA) deposited on Au(111) and Ag(111) surfaces by electrospray ionization using low-temperature scanning tunneling microscopy. The molecules surprisingly adsorb with a bent geometry of the octyl groups making them chiral with eight possible configurations. When arranged in hexagonal networks however only one configuration was found making islands homochiral. We suggest a model of the geometry and a mechanism leading to the observed chiral amplification. Financial support by the Deutsche Forschungsgemeinschaft via the SFB 677 is gratefully acknowledged.