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Greengold, a giant cluster compound of unusual electronic structure

  • E. Gutiérrez
  • R. D. Powell
  • F. R. Furuya
  • J. F. Hainfeld
  • T. G. Schaaff
  • M. N. Shafigullin
  • P. W. Stephens
  • R. L. Whetten
Conference paper

Abstract

We report the isolation of a previously elusive giant gold-cluster compound with unusual electronic structure and excellent solid-state ordering properties, Greengold is a water-soluble Au:PR3 compound (R = p-C6H4 — CONHCH3) formed in high yield in the solution-phase reduction of R3PAuCl, Following chromatographic isolation, it has been investigated by electron microscopy (STEM), optical spectroscopy, mass spectrometry (MALDI), and X-ray diffraction, from which emerges a consistent picture of Greengold’s intrinsic characteristics as (i) a single compound of ~ 22 000 amu molecular weight, containing a strongly bound globular metal core of mass 14 800 (Au75, 1,3-nm equivalent diameter); (ii) a highly ordered solid, exhibiting diffraction through 21 orders of a 2.47-nm spacing; and (iii) a carrier of a highly structured optical absorption across the entire visible and near-infrared spectrum (to ~ 1.0 eV), including relative transparency in the blue and yellow regions, giving rise to its eponymous green tint.

PACS

61.46.+w Clusters, nanoparticles, and nanocrystalline materials 

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Copyright information

© Springer-Verlag Italia 1999

Authors and Affiliations

  • E. Gutiérrez
    • 1
  • R. D. Powell
    • 1
  • F. R. Furuya
    • 1
  • J. F. Hainfeld
    • 1
    • 2
  • T. G. Schaaff
    • 3
  • M. N. Shafigullin
    • 3
  • P. W. Stephens
    • 4
  • R. L. Whetten
    • 3
  1. 1.Nanoprobes Inc.Stony BrookUSA
  2. 2.Biology DivisionBrookhaven National LaboratoryUptonUSA
  3. 3.School of Physics and ChernistryGeorgia Institute of TechnologyAtlantaUSA
  4. 4.Department of PhysicsState University of New YorkStony BrookUSA

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