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Two-Dimensional Self-Assembly Of Supramolecular Structures

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  • MATTHIAS BÖHRINGER

    (Institut de Physique de la Matière Condensèe, Universitè de Lausanne, CH-1015 Lausanne, Switzerland)

  • WOLF-DIETER SCHNEIDER

    (Institut de Physique de la Matière Condensèe, Universitè de Lausanne, CH-1015 Lausanne, Switzerland)

  • RICHARD BERNDT

    (Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany)

Abstract

We briefly review recent low temperature scanning tunneling microscopy (STM) investigations performed in our laboratory1–5on the self-assembly of the dipolar organic molecule 1-nitronaphthalene (NN) adsorbed on the reconstructed Au(111) surface. NN becomes chiral upon planar adsorption on the gold surface. We observe several coverage-driven structural transformations which are associated with simultaneous changes in the enantiomeric composition of the self-assembled molecular structures. At low coverages almost exclusively decamers with an 8:2 ratio of the enantiomers are formed. In a medium coverage range enantiopure one-dimensional molecular double chains prevail on the surface. Subsequently, molecules with opposite handedness are admixed until at monolayer coverage racemic one- and two-dimensional structures coexist. Modeling shows that hydrogen bonding causes the observed self-assembly. A subtle interplay between the electrostatic interactions among the molecules and their interaction with the reconstructed metal surface is the origin of the observed coverage-driven chiral phase transition in two dimensions.

Suggested Citation

  • Matthias Böhringer & Wolf-Dieter Schneider & Richard Berndt, 2000. "Two-Dimensional Self-Assembly Of Supramolecular Structures," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 7(05n06), pages 661-666.
    • Handle: RePEc:wsi:srlxxx:v:07:y:2000:i:05n06:n:s0218625x00000749
    DOI: 10.1142/S0218625X00000749
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    Keywords

    ; 61.46.+w; 82.30.Nr; 61.16.Ch; 31.15.Qg;
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