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Formation of alkanethiolate-protected gold clusters with unprecedented core sizes in the thiolation of polymer-stabilized gold clusters

Tsunoyama, Hironori and Nickut, Patricia and Negishi, Yuichi and Al-Shamery, Katharina and Matsumoto, Yoshiyasu and Tsukuda, Tatsuya (2007) Formation of alkanethiolate-protected gold clusters with unprecedented core sizes in the thiolation of polymer-stabilized gold clusters. JOURNAL OF PHYSICAL CHEMISTRY C, 111 (11). pp. 4153-4158. ISSN Print Edition ISSN: 1932-7447; Web Edition ISSN: 1932-7455

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp067025q

Abstract

Octadecanethiolate-protected gold (Au:SC18) clusters were prepared by the reaction of C18SH and Au clusters stabilized by poly(N-vinyl-2-pyrrolidone) (PVP). Four samples were fractionated by recycling size exclusion chromatography 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 these core sizes is different from that (8, 14, 22, and 29 kDa) obtained by conventional reduction of Au(I)-SC18 polymers, which is governed by kinetic factors. The present finding shows that the Au:SR (R = organic group) clusters with a high tolerance to thiol etching can be systematically synthesized by first populating precursory Au clusters in a PVP matrix with subsequent thiolation of the preformed Au clusters.

Item Type:Article
Subjects:Material Science > Functional and hybrid materials
ID Code:2190
Deposited By:M T V
Deposited On:22 Dec 2008 15:35
Last Modified:22 Dec 2008 15:35

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