Chromatographic isolation of "missing" Au55 clusters protected by alkanethiolates

Hironori Tsunoyama; Yuichi Negishi; Tatsuya Tsukuda

doi:10.1021/ja061659t

Chromatographic isolation of "missing" Au₅₅ clusters protected by alkanethiolates

Hironori Tsunoyama, Yuichi Negishi, Tatsuya Tsukuda

Research output: Contribution to journal › Article › peer-review

124 Citations (Scopus)

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:SC_x clusters (x = 12, 18) were prepared by the reaction of alkanethiol (C_xSH) with polymer-stabilized Au clusters (_∼1.3 nm) and subsequently incubated in neat C_xSH. The resulting clusters were successfully fractionated by recycling gel permeation chromatography into Au_∼38:SC_x and Au_∼55:SC_x and identified by laser-desorption ionization mass spectrometry. The Au_∼55:SC_x 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 language	English
Pages (from-to)	6036-6037
Number of pages	2
Journal	Journal of the American Chemical Society
Volume	128
Issue number	18
DOIs	https://doi.org/10.1021/ja061659t
Publication status	Published - 2006 May 10
Externally published	Yes

ASJC Scopus subject areas

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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10.1021/ja061659t

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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.",

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AU - Tsunoyama, Hironori

AU - Negishi, Yuichi

AU - Tsukuda, Tatsuya

PY - 2006/5/10

Y1 - 2006/5/10

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AB - 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.

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Chromatographic isolation of "missing" Au₅₅ clusters protected by alkanethiolates

Abstract

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