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[求助补充材料]
 Synthesis of Water-Soluble [Au25(SR)18]- using Stoichiometric Amount of NaBH4 相关领域
化学计量学
化学
纳米团簇
硼氢化钠
还原剂
水溶液
硼氢化
纳米颗粒
无机化学
配体（生物化学）
纳米技术
物理化学
有机化学
催化作用
受体
材料科学
生物化学
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| DOI | |
| 其它 |
ABSTRACT: Determination of the stoichiometry of reactions is a pivotal step for any chemical reactions toward a desirable product, which has been successfully achieved in organic synthesis. Here, we present the first precise determination of the stoichiometry for the reactions toward gold nanoparticle formation in the sodium borohydride reduction method. Leverag- ing on the real-time mass spectrometry technique, we have determined a precise balanced reaction – 32/x [Au(SR)]x + 8 e- = [Au25(SR)18]- + 7 [Au(SR)2]- (here SR denotes thiolate ligand) toward a stoichiometric synthesis of water-soluble [Au25(SR)18]-, where 8 electrons (from reducing agents) are sufficient to react with every 32 Au atoms, leading to the for- mation of high purity [Au25(SR)18]-. More interestingly, by real-time monitoring the growth process of thiolate-protected Au nanoclusters, we have successfully identified an important yet missing by-product, [Au(SR)2]-. |
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(2025-6-4)
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