Origin of magic stability of thiolated gold clusters: A case study on Au25(SC6H13)18

Yuichi Negishi, Nirmalya K. Chaki, Yukatsu Shichibu, Robert L. Whetten, Tatsuya Tsukuda

Research output: Contribution to journalArticlepeer-review

305 Scopus citations

Abstract

The present work aims to test the validity of the electronic shell model for Au25(SC6H13)18 by monitoring the charge state of the Au:S core and thereby to elucidate the origin of magic stability. Electrospray ionization mass spectrometry revealed that the Schiffrin method yields [Au25(SC6H13)18]x with a distribution of charge states, which shifts toward negative values with reduction time. The stable ions [Au25(SC6H13)18]1+ and [Au25(SC6H13)18]1-can be synthesized by chemical oxidation and reduction of [Au25(SC6H13)18]0, respectively. These findings lead us to conclude that electronic shell closing is not a crucial factor for the high stability of [Au25(SC6H13)18]x (x = 1-, 0, 1+). We ascribe magic stability to the core-in-cage structure predicted theoretically.

Original languageEnglish (US)
Pages (from-to)11322-11323
Number of pages2
JournalJournal of the American Chemical Society
Volume129
Issue number37
DOIs
StatePublished - Sep 19 2007
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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