TWO-DIMENSIONAL SELF-ASSEMBLY OF SUPRAMOLECULAR STRUCTURES

Matthias Böhringer, Wolf-Dieter Schneider and Richard Berndt
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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

Surface Review and Letters (SRL), 2000, vol. 07, issue 05n06, 661-666

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.

Keywords: 61.46.+w; 82.30.Nr; 61.16.Ch; 31.15.Qg (search for similar items in EconPapers)
Date: 2000
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DOI: 10.1142/S0218625X00000749

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