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O: Fachverband Oberflächenphysik

O 92: Nanostructures at Surfaces II

O 92.7: Talk

Thursday, March 21, 2024, 16:30–16:45, MA 042

Isomorphism of Supramolecular vs. Covalent Binding Motifs in Molecules Forming Two-Dimensional Nanopatterns — •David Ari Hofmeister, Lucas Rothe, Sigurd Höger, and Stefan-Sven Jester — Kekulé-Institut für Organische Chemie und Biochemie, Rheinische Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Str. 1, 53121 Bonn, Germany

The isomorphic packing of different molecules is an established concept in crystallography. Established for three-dimensional (3D) crystals, the concept has recently been extended to two-dimensional (2D) supramolecular patterns of organic molecules on a solid surface, such as highly-oriented pyrolytic graphite (HOPG). The formation of a physisorbed 2D nanopattern is driven by noncovalent interactions. Thereby, different types of interactions (e.g. hydrogen bonds and van der Waals interactions) determine the packing, while the balance of interactions is crucial for 2D self-assembly. Here, we substitute a noncovalent interaction motif (i.e. the hydrogen bond interaction between two carboxylic acids, R-COOH) with a covalent linkage (a butadiynylene unit). N molecules with COOH groups at opposite ends and an n-mer (in which n−1 R-COOH...HOOC-R units are substituted by a butadiynylene unit) pack isomorphously. In situ scanning tunneling microscopy at the 1,2,4-trichlorobenzene/HOPG interface provides a submolecularly resolved insight into the nanopatterns formed.

Keywords: Isomorphism; Nanopatterns; Self-Assembly; Solid-Liquid Interface; Scanning Tunneling Microscopy