Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 47: [DS] Micro- and nanopatterning (jointly with O)

O 47.6: Vortrag

Mittwoch, 28. März 2012, 13:00–13:15, H 0111

Nanopatterning by molecular polygons — •Stefan-Sven Jester, Eva Sigmund, Natalia Shabelina, Stephan M. Le Blanc, and Sigurd Höger — Rheinische Friedrich-Wilhelms-Universität Bonn, Kekulé-Institut für Organische Chemie und Biochemie, Gerhard-Domagk-Str. 1, 53121 Bonn, Germany

Self-assembly of rigid molecules at the solution/solid interface interface allows an efficient approach towards two-dimensional supramolecular crystalline surface patterns. In-situ scanning tunneling microscopy yields a submolecularly resolved insight into the adlayer structures and thus a conclusion on the driving forces for their formation. Of particular interest is how the nanoscale architectures depends on the symmetry and dimensions of the molecular building blocks and their substituents. One approach to tailored adlayers is based on the adsorption of shape-persistent arylene-alkynylene macrocycles at the interface of 1,2,4-trichlorobenzene and HOPG. The molecules are accessible from organic synthesis and can be widely substituted with functional groups. Recent work has focused on macrocycles involving dithiophene corner building blocks connected via linear phenylene-ethynylene-butadiynylene units that can be viewed as molecular polygons of distinct symmetry (i.e. triangles, squares, pentagons, and hexagons), so that concepts of discrete geometry can be applied to design tailorable nanoscale surface patterns. The results gain insight into the 2D crystallization of nanoscale pentagons, binary mixtures of triangles and hexagons, and how large periodicities of several 10 nm may become accessible.