Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 61: Graphene II: Adsorption, Intercalation and Doping

O 61.7: Talk

Wednesday, March 9, 2016, 16:30–16:45, S053

Supramolecular nanopatterns of organic molecules on graphite — •Stefan-Sven Jester — Kekulé-Institut für Organische Chemie und Biochemie, Rheinische Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Str. 1, 53121 Bonn

The self-assembly of organic molecules at the solid/liquid interface provides an approach towards defined 2D architectures. However, predicting how a specific molecule renders into a supramolecular 2D crystal is still a challenge. A promising approach relies on the transfer of concepts from discrete geometry (e.g. Archimedean surface tiling) to supramolecular chemistry: Arylene-alkynylene macrocycles of distinct symmetries and sizes that carry flexible alkyl/alkoxy side chains can be viewed as molecular polygons that form supramolecular patterns of specific symmetries and lattice constants. E.g., the cocrystal of molecular triangles and hexagons has increased lattice constants as compared to the individual compounds. We describe a concentration-driven alteration between porous and dense packings of hexagons with reduced symmetry and alike unit cell parameters for rings with different interiors. In addition, we discuss mono- and multilayer growth of molecular spoked wheels on graphite. In all cases, scanning tunneling microscopy provides a submolecularly resolved insight into the molecular structures that can be utilized for chemical compound analysis.