Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 3: Inorganic/Organic Interfaces: Growth I

O 3.6: Vortrag

Montag, 16. März 2015, 11:45–12:00, MA 005

2D-Nanopatterns of molecular polygons and spoked wheels — •Stefan-Sven Jester, A. Vikas Aggarwal, Robert May, and Sigurd Höger — Rheinische Friedrich-Wilhelms-Universität Bonn, Kekué-Institut für Organische Chemie und Biochemie, Gerhard-Domagk-Str. 1, 53121 Bonn, Germany

Shape-persistent macrocycles self-assemble at the solid/liquid interface of graphite (HOPG) into two-dimensional monolayer patterns that can be imaged by scanning tunneling microscopy (STM). We recently investigated monolayers of arylene-alkynylene macrocycles that can be viewed as molecular polygons consisting of n corners and n sides (n=3−6) and form supramolecular Archimedean tiling patterns. Thereby, two conformers of the hexamer were observed: an equilateral and a collapsed hexagon. Stimulated by these observations, we studied the mono- and multilayer formation of molecular spoked wheels, in which the hexagonal macrocycle rim is stiffened by an intraannular spoke/hub system. In addition, the importance and informative value of STM techniques for the compound characterization of large organic molecules is highlighted. [1] S.-S. Jester, E. Sigmund, S. Höger J. Am. Chem. Soc. 2011, 133, 11062. [2] S.-S. Jester, A. V. Aggarwal, D. Kalle, S. Höger Beilstein J. Org. Chem. 2014, 10, 2783. [3] R. May, S.-S. Jester, S. Höger J. Am. Chem. Soc. 2014, DOI: 10.1021/ja5096705.