[Ag25(SR)18]−: The “Golden” Silver Nanoparticle

Silver nanoparticles with an atomically precise molecular formula [Ag25(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., [Au25(SR)18]−, in ter...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2015-09, Vol.137 (36), p.11578-11581
Main Authors: Joshi, Chakra P, Bootharaju, Megalamane S, Alhilaly, Mohammad J, Bakr, Osman M
Format: Article
Language:English
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Summary:Silver nanoparticles with an atomically precise molecular formula [Ag25(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., [Au25(SR)18]−, in terms of number of metal atoms, ligand count, superatom electronic configuration, and atomic arrangement. Furthermore, both [Ag25(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.
ISSN:0002-7863
1520-5126
DOI:10.1021/jacs.5b07088