Kinetic stabilization of growing gold clusters by passivation with thiolates.
Kinetic stabilization of growing gold clusters by passivation with thiolates.
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DOI：
10.1021/jp062140m
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发表时间：
2006-06
期刊：
影响因子：
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通讯作者：
Y. Negishi;Yoshimitsu Takasugi;Seiichi Sato;H. Yao;K. Kimura;T. Tsukuda
中科院分区：
文献类型：
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作者：
Y. Negishi;Yoshimitsu Takasugi;Seiichi Sato;H. Yao;K. Kimura;T. Tsukuda
通过还原相应的 Au(I)-硫醇盐聚合物来制备受单层谷胱甘肽、N-(2-巯基丙酰基)甘氨酸或巯基琥珀酸保护的小金簇 (<1 nm)，并使用聚丙烯酰胺凝胶电泳 (PAGE) 按大小进行分级。对分级簇的质量分析表明，它们的核心尺寸随硫醇盐的分子结构而变化。这一发现表明，Au(I)-硫醇盐聚合物的还原产生了小簇，其生长在动力学上受到硫醇盐钝化的阻碍。具有相同组成的簇的光谱根据硫醇盐分子结构表现出不同的轮廓。这一观察结果表明，下面的金核的变形是由配体间相互作用引起的。
Small gold clusters (<1 nm), protected by monolayers of glutathione, N-(2-mercaptopropionyl)glycine, or mercaptosuccinic acid, were prepared by reducing the corresponding Au(I)-thiolate polymers and were fractionated by size using polyacrylamide gel electrophoresis (PAGE). Mass analysis of the fractionated clusters revealed that their core sizes varied with the molecular structures of the thiolates. This finding indicates that the reduction of the Au(I)-thiolate polymers yields small clusters whose growth is kinetically hindered by passivation with thiolates. Optical spectra of the clusters with identical compositions exhibited different profiles depending on the thiolate molecular structures. This observation implies that deformation of the underlying gold cores is induced by interligand interactions.