Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 92: Nanostructures at Surfaces II
O 92.9: Vortrag
Donnerstag, 21. März 2024, 17:00–17:15, MA 042
Supramolecular nanopatterns of caltrop-shaped molecular platforms on graphite — •Jakob Gabriel, David Ari Hofmeister, Georgiy Poluektov, Tristan Johannes Keller, Sigurd Höger, and Stefan-Sven Jester — Kekulé-Institut für Organische Chemie und Biochemie, Universität Bonn, Gerhard-Domagk-Str. 1, 53121 Bonn, Germany
Two-dimensional supramolecular nanopatterns of arylene-alkynylenes carrying long alkyl/alkoxy side chains are investigated at the solid/liquid interface on highly oriented pyrolytic graphite (HOPG). Scanning tunneling microscopy provides a submolecularly resolved insight into the nanopatterns formed. In many cases, the exact interdigitation motifs of the side chains are clearly resolved. We have recently reported on molecular spoked wheel architectures with intraannular pillars carrying large entities, such as a perylene monoimide or a fullerene unit, pointing into the volume phase.[1] Here, we focus on investigating a caltrop-shaped tetraphenylmethane derivative with three ”foot” units (instead of a ring-shaped platform). Each of the ”feet” carries two pairs of OC16H33 side chains. We evaluate the abundance of different polymorphs that form, when different concentrations in the supernatant liquid phase as well as different solvents are used (1,2,4-trichlorobenzene and 1-phenyloctane).
[1] G. Poluektov, T. J. Keller, A. Jochemich, A. Krönert, U. Müller, S. Spicher, S. Grimme, S.-S. Jester, S. Höger Angew. Chem. Int. Ed. 2021, 60, 27264.