Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 2: Organische Dünnschichten I

O 2.9: Vortrag

Freitag, 4. März 2005, 12:45–13:00, TU EB301

STM investigations of ordered monolayers of tetralactam macrocycles on Au(111) — •Iordan Kossev and Moritz Sokolowski — Institut für Physikalische und Theoretische Chemie, Universität Bonn, Wegelerstr. 12, 53115 Bonn, Germany

Rotaxanes and catenanes are of interest for the investigation on mechanically interlocked molecules [1]. A large tetralactam - macrocycle (905.05 amu), very often used as a building block for catenanes, was deposited onto the Au(111) surface in UHV from a thermal evaporation cell. STM images were taken for different coverages at room temperature. At a coverage around one monolayer, different long range ordered monolayer structures were observed with submolecular resolution on the terraces. After annealing to 400 K, in addition to the two dimensional structures, chains of well ordered molecules adsorbed at step edges were observed. We explain these STM images by structure models based on a weak interaction of the molecules to the Au(111) surface and a considerable intermolecular interaction due to hydrogen bonds. The macrocycles were kindly supplied by C. Schalley and F. Vögtle. This work was supported by the DFG (SFB 624).
C. A. Schalley, K. Beizai, F. Vögtle, Acc. Chem. Res. 34 (2001) 465.