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

Research output: Contribution to journalArticlepeer-review

55 Scopus citations


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 compourd of ∼22000 amu molecular weight, containing a strongly bound globular metal core of mass 14800 (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.

Original languageEnglish (US)
Pages (from-to)647-651
Number of pages5
JournalEuropean Physical Journal D
Issue number1-4
StatePublished - Dec 1999
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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