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. 2017 Jul 20;7:5976. doi: 10.1038/s41598-017-05156-9

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Synthesis routes for the preparation of Ag clusters protected by Au-thiolate complexes (Ag/Au-t, top panel) and bare Ag clusters (bottom panel). In the schematic depictions of the two systems, the green circles correspond to carboxylic end-groups and the subscript n = 7. The molecular surfactants (tetrabutylammonium, TBA and 16-mercaptohexadecanoic acid, MHDA) are omitted for clarity. (b) Absorption spectrum of Ag/Au-t and Ag clusters aliquots of the reaction medium as function of time. The insets show the experimental and simulated isotopic mass distribution patterns of [Ag₃Au₃(MHDA)₃(TBA)₂H₂]⁺ and [Ag₃(MHDA)₂(TBA)₄(NO₃)O]⁺ chemical species for the protected and bare clusters, respectively.