Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 90: Semiconductor Substrates
O 90.6: Vortrag
Freitag, 15. März 2013, 11:45–12:00, H45
Self-assembly of cis-Oligodiacetylenes from solution — •Christian Steiner1, Erin T. Chernick2, David Geßner1, Maximilian Ammon1, Rik R. Tykwinski2, and Sabine Maier1 — 1Department of Physics, University of Erlangen-Nürnberg, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany — 2Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Henkestraße 42, 91054 Erlangen, Germany
Cis-Oligodiacetylenes (ODAs) typically tend to adopt a folded, helical conformation in solution. Helical oligomers or polymers with a conjugated, chiral backbone provide a material with unique electronic and photonic properties which can be applied towards enantioselective sensing, chiral catalysis or for templating self-assembly, yielding chiral nanostructures.
The influence of the solvent on the conformation of ODAs was probed both by scanning tunneling microscopy and atomic force microscopy in ambient condition. We found that molecules solved in isopropanol aggregate in clusters, while molecules solved in tetrahydrofuran form flat films on the surface. Clusters on Mica surfaces are typically larger than on HOPG indicating that not only the solvent but also the surface charge influences the aggregation of the molecules. Molecularly resolved scanning tunneling microscopy images on HOPG suggest that in films the ODAs assemble in wire-like structures.