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Hyperfine Interactions

, Volume 207, Issue 1–3, pp 127–131 | Cite as

Study of the structure and electronic state of thiolate-protected gold clusters by means of 197Au Mössbauer spectroscopy

  • Norimichi Kojima
  • Kazuhiro Ikeda
  • Yasuhiro Kobayashi
  • Tatsuya Tsukuda
  • Yuichi Negishi
  • Genta Harada
  • Tadashi Sugawara
  • Makoto Seto
Article

Abstract

We have investigated the structures and electronic states of a series of glutathionate-protected Au clusters, Au n (SG) m with n = 10 − ∼55, using 197Au Mössbauer spectroscopy, which allows us to probe the local environment of the constituent Au atoms via isomer shift (IS) and quadrupole splitting (QS). The spectral profile abruptly changes on going from Au22(SG)17 to Au25(SG)18, then it smoothly changes to that of Au∼55(SG)m. However, the spectral profile dramatically changes on going from Au∼55(SG)m to the dodecanethiolate-protected Au cluster with average diameter of 2 nm. The 197Au Mössbauer spectra of glutathionate-protected Au clusters and dodecanethiolate-protected Au clusters were successfully analyzed on the basis of the structure and electronic state of Au25(SG)18.

Keywords

Gold cluster 197Au Mössbauer spectroscopy Nanomaterial 

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Norimichi Kojima
    • 1
  • Kazuhiro Ikeda
    • 1
  • Yasuhiro Kobayashi
    • 2
  • Tatsuya Tsukuda
    • 3
  • Yuichi Negishi
    • 4
  • Genta Harada
    • 1
  • Tadashi Sugawara
    • 1
  • Makoto Seto
    • 2
  1. 1.Graduate School of Arts and SciencesThe University of TokyoTokyoJapan
  2. 2.Research Reactor InstituteKyoto UniversityOsakaJapan
  3. 3.Catalysis Research CenterHokkaido UniversityHokkaidoJapan
  4. 4.Department of Applied Chemistry, Faculty of ScienceTokyo University of ScienceTokyoJapan

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