Ligand-Induced Stability of Gold Nanoclusters: Thiolate versus Selenolate
Ligand-Induced Stability of Gold Nanoclusters: Thiolate versus Selenolate
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DOI：
10.1021/jz301191t
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发表时间：
2012-09-20
影响因子：
5.7
通讯作者：
Negishi, Yuichi
中科院分区：
文献类型：
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作者：
Kurashige, Wataru;Yamaguchi, Masaki;Negishi, Yuichi
硫醇盐保护的金纳米团簇作为新型功能材料的构建单元引起了人们的极大关注，并得到了广泛的研究。一些研究已经报道，将这些金纳米团簇的配体从硫醇盐改变为硒盐增加了团簇稳定性。为了证实这一点，在这项研究中，我们比较了精确合成的[Au-25（SC 8H 17）（18）]（-）和[Au-25（SeC 8H 17）（18）]（-）在溶液中降解、热溶解和激光裂解的稳定性。结果表明，改变配体从硫醇盐硒增加集群的稳定性，涉及金配体键的解离反应，但降低集群的稳定性，涉及配体的分子内解离反应。这些结果表明，使用硒代配体使得有可能产生比硫醇盐保护的金纳米团簇更稳定的金团簇，以防止在溶液中的降解。
Thiolate-protected gold nanoclusters have attracted considerable attention as building blocks for new functional materials and have been extensively researched. Some studies have reported that changing the ligand of these gold nanoclusters from thiolate to selenolate increases cluster stability. To confirm this, in this study, we compare the stabilities of precisely synthesized [Au-25(SC8H17)(18)](-) and [Au-25(SeC8H17)(18)](-) against degradation in solution, thermal dissolution, and laser fragmentation. The results demonstrate that changing the ligand from thiolate to selenolate increases cluster stability in reactions involving dissociation of the gold-ligand bond but reduces cluster stability in reactions involving intramolecular dissociation of the ligand. These results reveal that using selenolate ligands makes it possible to produce gold clusters that are more stable against degradation in solution than thiolate-protected gold nanoclusters.