Extremely high stability of glutathionate-protected Au25 clusters against core etching

Yukatsu Shichibu, Yuichi Negishi, Hironori Tsunoyama, Masayuki Kanehara, Toshiharu Teranishi, Tatsuya Tsukuda

Research output: Contribution to journalArticle

299 Citations (Scopus)

Abstract

The etching reactivity of glutathionate (SG) protected Au n(SG)m clusters, where (n,m)=(10,10), (15,13), (18, 14), (22,16), (25,18), (29,20), (33, 22), and (39, 24) by free glutathione (GSH) under aerobic condition, was analyzed. It was observed that the colors of the solution of smaller Aun(SG)m cluster (core size n<25) faded after the addition of free GSH and became cloudy after three hours, while those for larger clusters (n≥25) did not exhibited appreciable color changes. The Au25(SG)18 and Au39(SG)25 showed the highest stability during storage in water for two weeks at ambient temperature. The high stability of Au25(SG)18 against core etching was contributed by chemical inertness arising from full protection by the SG ligands.

Original languageEnglish
Pages (from-to)835-839
Number of pages5
JournalSmall
Volume3
Issue number5
DOIs
Publication statusPublished - 2007 May 1
Externally publishedYes

Keywords

  • Clusters
  • Core/shell materials
  • Etching
  • Glutathione
  • Gold

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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  • Cite this

    Shichibu, Y., Negishi, Y., Tsunoyama, H., Kanehara, M., Teranishi, T., & Tsukuda, T. (2007). Extremely high stability of glutathionate-protected Au25 clusters against core etching. Small, 3(5), 835-839. https://doi.org/10.1002/smll.200600611