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Molecular Suction Pads: Self-Assembled Monolayers of Subphthalocyaninatoboron Complexes on Gold

Authors

  • Dr. Ulrich Glebe,

    1. Institute of Chemistry, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel (Germany)
    2. Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel (Germany)
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  • Dr. Joe E. Baio,

    1. Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz (Germany)
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  • Prof. Líney Árnadóttir,

    1. School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, OR 97331 (USA)
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  • Prof. Ulrich Siemeling,

    1. Institute of Chemistry, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel (Germany)
    2. Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel (Germany)
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  • Dr. Tobias Weidner

    Corresponding author
    1. Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz (Germany)
    • Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz (Germany)
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Abstract

Subphthalocyaninatoboron complexes with six long-chain alkylthio substituents in their periphery are applicable for the formation of self-assembled monolayers (SAMs) on gold. Such films are prepared from solution with the axially chlorido-substituted derivatives and characterised by near-edge X-ray absorption fine structure (NEXAFS) spectroscopy, X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS). The results are in accord with the formation of SAMs assembled by the chemisorption of both covalently bound thiolate-type as well as coordinatively bound thioether units. The adsorbate molecules adopt an essentially flat adsorption geometry on the substrate, resembling a suction pad on a surface.

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