Dresden 2006 – scientific programme

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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 14.40: Poster

Monday, March 27, 2006, 18:00–21:00, P2

STM investigations on ordered monolayers of a large tetralactame macrocycle on single crystal metal surfaces — •Iordan Kossev and Moritz Sokolowski — Institut für Physikalische und Theoretische Chemie, Universität Bonn, Wegelerstr. 12, 53115 Bonn, Germany

Large macrocycles are of interest for investigations on mechanically interlocked molecules, e.g., catenanes and rotaxanes [1]. We have studied macrocycle molecules (905.05 amu) of the tetralactame type under UHV on the Au(111) surface. The molecules were deposited from a home build Knudsen cell and STM images were taken at different coverages at room temperature. Two different long range ordered phases, α and β, were observed after annealing to 400 K. The STM images are explained by a structure with partially overlapping and inclined lying molecules. This model is also supported from DFT calculations which reveal that hydrogen bonds between the molecules are responsible for the observed structures. The macrocycles were kindly supplied by C. A. Schalley and F. Vögtle. DFT calculations were done by W. Reckien and B. Kirchner. This work was supported by the DFG (SFB 624).

[1] C. A. Schalley, K. Beizai, F. Vögtle, Acc. Chem. Res. 34 (2001) 465.