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O: Fachverband Oberflächenphysik

O 87: Poster Session - Nanostructures at Surfaces: 1D and 2D Structures and Networks

O 87.5: Poster

Mittwoch, 18. März 2020, 18:15–20:00, P2/1OG

Coadsorption of shape-persistent macrocycles and fullerene derivatives on graphite: Lithography with the STM tip — •Joshua Bahr, Annemarie Meyer, Tristan J. Keller, Sigurd Höger, and Stefan-Sven Jester — Kekulé-Institut für Organische Chemie und Biochemie, Bonn, Deutschland

Shape-persistent arylene-alkynylene macrocycles self-assemble into 2D crystalline nanopatterns at the solid/liquid interface of highly oriented pyrolytic graphite (HOPG) and 1-phenyloctane, and are imaged in situ by scanning tunneling microscopy (STM) with submolecular resolution. The physisorption and packing of such species is driven by long extraannular alkoxy substituents, which also guarantee sufficient compound solubility for processing. The ability of macrocycles to template the adsorption of fullerenes on HOPG has gained recent interest, as it does not require covalent bond formation.[1] Here, we report on patterns of macrocycles on HOPG, that are metastable upon addition of fullerene PC61BM to the supernatant liquid phase. STM-tip induced local disturbance of such a system leads to desorption of the macrocycles and re-adsorption of cocrystals of both compounds. We discuss both potential and limits of STM-based supramolecular lithography at the solid/liquid interface. [1] G.-B. Pan, X.-H. Cheng, S. Höger, W. Freyland, J. Am. Chem. Soc. 2006, 128, 4218-4219.