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O: Fachverband Oberflächenphysik

O 92: Nanostructures at Surfaces II

O 92.11: Talk

Thursday, March 21, 2024, 17:30–17:45, MA 042

Supramolecular nanopatterns of pentagonal arylene-alkynylenes on graphite — •Israa Abushawish, Vanessa Bobbe, Christian Krewer, Anna Krönert, Georgiy Poluektov, Kristin Gratzfeld, Sigurd Höger, and Stefan-S. Jester — Kekulé-Institut für Organische Chemie und Biochemie, Bonn, Germany

The physisorption of organic molecules at solid surfaces is an effective way to produce highly ordered two-dimensional (2D) nanoscale functional arrays. Shape-persistent arylene- alkynylenes with flexible alkyl/alkoxy substituents decorate the solid/liquid interface of highly oriented pyrolytic graphite (HOPG) and a solution of the compound of interest in 1,2,4- trichlorobenzene (TCB). The so-formed nanopatterns are imaged in situ by scanning tunneling microscopy (STM, with the tip immersed into the solution), providing submolecularly resolved insights into the nanopatterns formed. Recently, a series of macrocycles with 3- to 6-fold symmetry has led to the concept of molecular polygons [1,2]. Here, we report on the influence of symmetry, substitution patterns, and the influence of different corner units (i.e. carbazole, dibenzofurane, and dithiophene [1]) on the exact shapes of the molecular pentagons and their different supramolecular packings.

References: [1] S.-S. Jester, E. Sigmund, S. Hoeger, J. Am. Chem. Soc 2011, 133, 29, 11062.

[2] P. Wilhelm, J. Vogelsang, G. Poluektov, N. Schönfelder, T. J. Keller, S.-S. Jester, S. Höger, J. M. Lupton, Angew. Chem. Int. Ed . 2017, 56, 1234.