Size Exclusion Chromatography for Semipreparative Scale Separation of Au38(SR)24 and Au40(SR)24 and Larger Clusters

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• 作者：Stefan Knoppe ; Julien Boudon ; Igor Dolamic ; Amala Dass ; Thomas Bu虉rgi
• 刊名：Analytical Chemistry
• 出版年：2011
• 出版时间：July 1, 2011
• 年：2011
• 卷：83
• 期：13
• 页码：5056-5061
• 全文大小：840K
• 年卷期：v.83,no.13(July 1, 2011)
• ISSN：1520-6882

文摘

Size exclusion chromatography (SEC) on a semipreparative scale (10 mg and more) was used to size-select ultrasmall gold nanoclusters (<2 nm) from polydisperse mixtures. In particular, the ubiquitous byproducts of the etching process toward Au₃₈(SR)₂₄ (SR, thiolate) clusters were separated and gained in high monodispersity (based on mass spectrometry). The isolated fractions were characterized by UV鈥搗is spectroscopy, MALDI mass spectrometry, HPLC, and electron microscopy. Most notably, the separation of Au₃₈(SR)₂₄ and Au₄₀(SR)₂₄ clusters is demonstrated.