Oxygen’s Role in Aqueous Gold Cluster Synthesis

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• 作者：Timothy A. DreierW. Scott Compel ; O. Andrea Wong ; Christopher J. Ackerson
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：December 15, 2016
• 年：2016
• 卷：120
• 期：49
• 页码：28288-28294
• 全文大小：434K
• ISSN：1932-7455

文摘

The presence of oxygen in thiolate-protected gold nanoparticle synthesis influences product distribution. Oxygen’s diradical nature underlies this effect, and oxygen can be replaced with radical initiators in the synthesis of organosoluble gold nanoclusters. The role of O₂ in the synthesis of water-soluble clusters such as Au₁₀₂(p-MBA)₄₄, Au₂₅(SR)₁₈, as well as the thiol etching of water-soluble colloidal gold particles is not yet established. Herein it is shown that radicals, either from O₂ or from radical initiators such as 4-hydroxy-TEMPO, are necessary components for synthesis of water-soluble thiolate-protected gold nanoclusters, as well as the etching of aqueous colloidal gold by thiols. Furthermore, air-free synthetic routes to water-soluble gold nanoclusters Au₁₀₂(SR)₄₄ and Au₂₅(SR)₁₈ are described. Overall, the understanding of the role of radicals in the synthesis of water-soluble gold clusters will allow standardization of often difficult to reproduce syntheses that attract increasing attention for biological applications.