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. 2017 Oct 13;8:927. doi: 10.1038/s41467-017-00970-1

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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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Fig. 7 — Seed-mediated synthesis of [Au₃₈(SR)₂₄]⁰. a Ultraviolet-visible absorption and b electrospray ionization mass spectra of [Au₃₈(SR)₂₄]⁰. The inset in a is digital photo of an aqueous solution of [Au₃₈(SR)₂₄]⁰. The absorption features at 480, 630, and 790 nm in a are in good agreement with the most prominent absorption of organic-soluble [Au₃₈(SR)₂₄]⁰ with a fused bi-icosahedral Au₂₃ core⁵². The magenta and black lines in bottom spectra of b show the simulated and experimental isotope patterns of [Au₃₈(SR)₂₄+14 Na–20 H]⁶⁻, respectively