[Ag25(SR)18]鈭?/sup>: The 鈥淕olden鈥?Silver Nanoparticle
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- 作者：Chakra P. Joshi ; Megalamane S. Bootharaju ; Mohammad J. Alhilaly ; Osman M. Bakr
- 刊名：Journal of the American Chemical Society
- 出版年：2015
- 出版时间：September 16, 2015
- 年：2015
- 卷：137
- 期：36
- 页码：11578-11581
- 全文大小：300K
- ISSN：1520-5126
文摘
Silver nanoparticles with an atomically precise molecular formula [Ag25(SR)18]p>鈭?/sup> (鈭扴R: 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., [Au25(SR)18]p>鈭?/sup>, in terms of number of metal atoms, ligand count, superatom electronic configuration, and atomic arrangement. Furthermore, both [Ag25(SR)18]p>鈭?/sup> 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.