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O: Oberflächenphysik

O 14: Poster session I (Adsorption, Epitaxy and growth, Phase transitions, Surface reactions, Organic films, Electronic structure, Methods) (sponsored by Omicron Nanotechnology GmbH)

O 14.55: Poster

Montag, 27. März 2006, 18:00–21:00, P2

STM Investigation of Oligopyridine Nanostructures Based on Weak Hydrogen Bonds — •Christoph Meier, Katharina Landfester, and Ulrich Ziener — Organische Chemie III, Makromolekulare Chemie und Organische Materialien, Universität Ulm, Albert-Einstein-Allee 11, D-89081 Ulm, Germany, ulrich.ziener@uni-ulm.de

A series of oligopyridine compounds was investigated by scanning tunnelling microscopy (STM) considering their self-assembly at the HOPG/liquid interface. They are all constitutional isomers, exhibiting the same overall molecular shape. A systematic change in the position of the nitrogen atoms in the terminal pyridine units causes different monolayer structures. The results show that the 2D nanostructures of the oligopyridines are dominated by weak intermolecular hydrogen bonds. The packing pattern can be generalised based on a geometrical model which is determined by the relative orientations of the directional H-bonding interactions.

The observed monolayers exhibit further functional subunits and highly ordered voids which can be used as potential binding sites for several guest units. These results can be used for the development of a new concept of 2D crystal engineering based on weak C-H*N hydrogen bonds as subtle directional forces which opens a new pool of building blocks in surface nano patterning.