Investigation on the Mechanism of the Synthesis of Gold(I) Thiolate Complexes by NMR
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- 作者：Chunhong Yu ; Lili Zhu ; Rongchun Zhang ; Xiaoliang Wang ; Chengchen Guo ; Pingchuan Sun ; Gi Xue
- 刊名：Journal of Physical Chemistry C
- 出版年：2014
- 出版时间：May 15, 2014
- 年：2014
- 卷：118
- 期：19
- 页码：10434-10440
- 全文大小：313K
- 年卷期：v.118,no.19(May 15, 2014)
- ISSN：1932-7455
文摘
In this article, we characterized the polymeric gold(I) thiolates that precipitated from the intermediate solutions during the synthesis process of gold nanoparticles (GNPs) by the Brust鈥揝chiffrin two-phase method and investigated the formation mechanism of the polymeric gold(I) thiolates. The solution 1H NMR confirmed the complete reduction from Au(III) to Au(I) with the addition of the first two equivalents of thiols, while only the third and fourth equivalents of thiols were found to participate in forming gold(I) thiolates. Gold(I) thiolates, [Au(I)SR]n, precipitated from these solutions were further characterized by 1H solid-state NMR spectroscopy under fast magic angle spinning (MAS), Raman spectroscopy, and thermogravimetric analysis. Further quantitative studies revealed that the composition of [Au(I)SR]n could be controlled by changing the order of addition of the third and fourth equivalents of thiols. This work has great significance to better understand the mechanism of gold nanoparticle formation and thus to tailor the properties of the final products.