Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 10: Metal substrates: Adsorption of organic / bio molecules II

O 10.3: Talk

Monday, March 14, 2011, 15:30–15:45, TRE Phy

2D-self-assembly of chiral buckybowls — •Quirin Stoeckl¹, Tobias Bauert¹, Davide Bandera², Manfred Parschau¹, Jay S. Siegel², and Karl-Heinz Ernst¹ — ¹Empa, Nanoscale Material Science, Dübendorf, Switzerland — ²Organisch-chemisches Institut, Universität Zürich, Switzerland

So-called buckybowls, quasi-fragments of buckminsterfullerene, are promising candidates for suface modifications for organic photovoltaics and controlled carbon nanotube growth. Corannulene (COR, C₂₀H₁₀) is the simplest curved fragment with a central C₅ ring, surrounded by five aromatic C₆ rings. We investigated the self-assembly of the C₅-symmetric pentaphenyl-corannulene (Ph₅Cor), a chiral derivative with five phenyl groups at the rim, on Cu(111). Fivefold symmetry is incompatible with the translational order in all 17 2D plane groups, and this system is therefore of fundamental interest for 2D self-assembly. STM shows packing motifs in which the five substituents are interdigitated and are compatible with LEED results. Workfuntion change measurements via UPS reveal an unusual large interface dipole. We compare our findings with those obtained for other penta-substituted COR derivatives on Cu(111) and present preliminary results for thermally- induced dehydrogenation into polymeric structures.