Formation of alkanethiolate-protected gold clusters with unprecedented core sizes in the thiolation of polymer-stabilized gold clusters
Formation of alkanethiolate-protected gold clusters with unprecedented core sizes in the thiolation of polymer-stabilized gold clusters
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DOI：
10.1021/jp067025q
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发表时间：
2007-02
影响因子：
3.7
通讯作者：
H. Tsunoyama;P. Nickut;Y. Negishi;K. Al‐Shamery;Y. Matsumoto;T. Tsukuda
中科院分区：
文献类型：
--
作者：
H. Tsunoyama;P. Nickut;Y. Negishi;K. Al‐Shamery;Y. Matsumoto;T. Tsukuda
采用C18SH与聚（n -乙烯基-2-吡咯烷酮）（PVP）稳定的金团簇反应制备了十八烷硫酸保护金团簇（Au:SC18）。对制备的Au:SC18团簇进行循环粒径排除色谱分离，用激光解吸电离质谱法测定了4个样品的核心粒径分别为8、11、21和26 kDa。出乎意料的是，这些核尺寸的顺序与Au(I)−SC18聚合物的常规还原得到的（8,14,22和29 kDa）不同，这是由动力学因素决定的。本研究结果表明，首先在PVP基质中填充前体金团簇，然后对预制金团簇进行硫代化，可以系统地合成具有高硫代腐蚀耐受性的Au:SR （R =有机基团）团簇。
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.