[Ag25(SR)18]-: The "Golden" Silver Nanoparticle
[Ag25(SR)18]-: The "Golden" Silver Nanoparticle
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DOI：
10.1021/jacs.5b07088
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发表时间：
2015-09-16
影响因子：
15
通讯作者：
Bakr, Osman M.
中科院分区：
文献类型：
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作者：
Joshi, Chakra P.;Bootharaju, Megalamane S.;Bakr, Osman M.
合成了具有原子精确分子式[Ag-25（SR）（18）]（-）（-SR：硫醇盐）的银纳米颗粒，并测定了它们的单晶结构。这种合成的纳米团簇是唯一的银纳米颗粒，其在金中具有几乎相同的类似物，即，[Au-25（SR）（18）]（-），在金属原子数、配体数、超原子电子构型和原子排列方面。此外，[Ag-25（SR）（18）]（-）和其金类似物在其光学吸收光谱中具有许多共同特征。这种前所未有的模拟金的银分子类似物提供了第一个模型纳米粒子平台，以研究几个世纪以来的问题，即理解银和金之间在贵族，催化活性和光学性质方面的根本差异。
Silver nanopartides with an atomically precise molecular formula [Ag-25(SR)(18)](-) (-SR: thiolate) are synthesized, and their single-crystal structure is determined. This synthesized nanocluster is the only silver nanoparticle that has a virtually identical analogue in gold, i.e., [Au-25(SR)(18)](-), in terms of number of metal atoms, ligand count, superatom electronic configuration, and atomic arrangement. Furthermore, both [Ag-25(SR)(18)](-) and its gold analogue share a number of features in their optical absorption spectra. This unprecedented molecular analogue in silver to mimic gold offers the first model nanoparticle platform to investigate the centuries-old problem of understanding the fundamental differences between silver and gold in terms of nobility, catalytic activity, and optical property.