Gold Nanoparticles Stabilized by Acetylene-Functionalized Multidentate Thioether Ligands: Building Blocks for Nanoparticle Superstructures

Authors

  • Torsten Peterle,

    1. Department of Chemistry University of Basel St. Johanns-Ring 19, 4056 Basel (Switzerland)
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  • Philippe Ringler,

    1. C–CINA Biozentrum University of Basel Mattenstrasse 26, 4002 Basel (Switzerland)
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  • Marcel Mayor

    Corresponding author
    1. Department of Chemistry University of Basel St. Johanns-Ring 19, 4056 Basel (Switzerland)
    2. Institute for Nanotechnology Forschungszentrum Karlsruhe GmbH P. O. Box 3640, 76021 Karlsruhe (Germany)
    • Department of Chemistry University of Basel St. Johanns-Ring 19, 4056 Basel (Switzerland).
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Abstract

Aiming at the formation of inorganic/organic hybrid gold nanoparticle superstructures, the design and synthesis of acetylene-monofunctionalized multidentate thioether ligands and their ability to stabilize gold nanoparticles are presented. Rather monodisperse gold particles with diameters of about 1 nm are obtained, which are coated by a small number of ligands, each comprising a silyl-protected acetylene. The acetylene is attached at the end of a rigid ethynylene-phenylene unit of variable length, leading to functionalized gold nanoparticles carrying acetylenes at different distances from the nanoparticle surface. These particles are interlinked by diacetylene formation and are investigated by transmission electron microscopy and UV/vis spectroscopy, revealing the formation of nanoparticle aggregates and small superstructures such as dimers or trimers while the nanoparticles themselves retain their integrity. The interparticle distance in small nanoparticle superstructures reflects the ethynylene-phenylene spacer length corroborating the wet chemical interlinking as the origin of these organic/inorganic hybrid structures.

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