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All-aromatic, nanometer-scale, gold-cluster thiolate complexes.

Ryan C Price1, Robert L Whetten

  • 1Department of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA.

Journal of the American Chemical Society
|October 6, 2005
PubMed
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Researchers developed a new method to create gold:benzenethiolate monolayer-protected cluster (MPC) molecules. These novel arylthiolate gold MPCs are ideal for crystallization and structural analysis.

Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Monolayer-protected cluster (MPC) molecules are crucial in nanotechnology.
  • Gold-thiolate interactions are fundamental in cluster synthesis.
  • Characterizing small gold clusters presents significant challenges.

Purpose of the Study:

  • To develop a method for generating and isolating specific gold:benzenethiolate MPCs.
  • To synthesize a smaller core mass cluster from larger precursors.
  • To establish these new clusters as ideal candidates for crystallization and full structural determination.

Main Methods:

  • Synthesis and isolation of 22 and 29 kDa gold:benzenethiolate MPCs.
  • Chemical reaction to yield [(octyl)4N]2[Au44(SC6H5)28] (8.7 kDa core) clusters.

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  • Characterization using vibrational, electronic, 1H NMR, mass spectrometry, and powder X-ray diffraction.

    • Main Results:

    • Successful generation and isolation of gold:benzenethiolate MPCs with specific core masses.
    • Formation of a smaller 8.7 kDa core mass cluster via subsequent reaction.
    • Demonstration of size-dependent optical properties and anionic nature of the clusters.

    Conclusions:

    • This work presents the first report of all arylthiolate gold MPC molecules.
    • The synthesized clusters are suitable for detailed crystallization and structural characterization.
    • These findings advance the understanding and application of gold nanoclusters.