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. 2021 May 28;12:3212. doi: 10.1038/s41467-021-23568-0

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© The Author(s) 2021

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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Fig. 5 — a ESI mass spectra of the reaction solution of pure [Au₁₈SR₁₄]⁰ with or without the addition of Au(I)-SR complexes. b Calculated reaction energy of isoelectric addition reaction involving 4-electron species [Au₁₈SR₁₄]⁰. c MS/MS spectra and corresponding fragmentation pathways of 4-electron species when the collision energy is 15 eV. The peaks corresponding to the parent species and the 1st-generation fragment species are marked with red ▾ and blue ♦, respectively. More intense fragmentations were observed as the sizes of the NC species increased. d Changes in the on-set fragmentation energy of 4-electron species. See Supplementary Figs. 30–34 for more detailed MS/MS spectra and analysis.