Formation of Alkanethiolate-Protected Gold Clusters with Unprecedented Core Sizes in the Thiolation of Polymer-Stabilized Gold Clusters

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• 作者：Hironori Tsunoyama ; Patricia Nickut ; Yuichi Negishi ; Katharina Al-Shamery ; Yoshiyasu Matsumoto ; Tatsuya Tsukuda
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：March 22, 2007
• 年：2007
• 卷：111
• 期：11
• 页码：4153 - 4158
• 全文大小：323K
• 年卷期：v.111,no.11(March 22, 2007)
• ISSN：1932-7455

文摘

Octadecanethiolate-protected gold (Au:SC₁₈) clusters were prepared by the reaction of C₁₈SH and Au clustersstabilized by poly(N-vinyl-2-pyrrolidone) (PVP). Four samples were fractionated by recycling size exclusionchromatography of the as-prepared Au:SC₁₈ clusters, and their core sizes were determined to be 8, 11, 21,and 26 kDa by using laser desorption ionization mass spectrometry. Unexpectedly, the sequence of thesecore sizes is different from that (8, 14, 22, and 29 kDa) obtained by conventional reduction of Au(I)-SC₁₈polymers, which is governed by kinetic factors. The present finding shows that the Au:SR (R = organicgroup) clusters with a high tolerance to thiol etching can be systematically synthesized by first populatingprecursory Au clusters in a PVP matrix with subsequent thiolation of the preformed Au clusters.