Chromatographic isolation of "missing" Au55 clusters protected by alkanethiolates

Hironori Tsunoyama, Yuichi Negishi, Tatsuya Tsukuda

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Abstract

We report on the first synthesis of alkanethiolate-protected Au55 (11 kDa), which has been a "missing" counterpart of Schmid's Au55(PR3)12Cl6. Au:SCx clusters (x = 12, 18) were prepared by the reaction of alkanethiol (CxSH) with polymer-stabilized Au clusters (1.3 nm) and subsequently incubated in neat CxSH. The resulting clusters were successfully fractionated by recycling gel permeation chromatography into Au∼38:SCx and Au∼55:SCx and identified by laser-desorption ionization mass spectrometry. The Au∼55:SCx clusters exhibited structured optical spectra, suggesting molecular-like properties. The thiolate monolayers were found to be liquid-like on the basis of the IR spectrum and the monolayer thickness, which was estimated from the hydrodynamic diameter.

Original languageEnglish
Pages (from-to)6036-6037
Number of pages2
JournalJournal of the American Chemical Society
Volume128
Issue number18
DOIs
Publication statusPublished - 2006 May 10
Externally publishedYes

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ASJC Scopus subject areas

  • Chemistry(all)

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