Title: On the mechanism of rapid metal exchange between thiolate-protected gold and gold/silver clusters: a time-resolved in situ XAFS study
Language: English
Authors: Zhang, Bei 
Safonova, Olga V.
Pollitt, Stephan
Salassa, Giovanni 
Sels, Anneliese 
Kazan, Rania 
Wang, Yuming 
Rupprechter, Günther
Barrabés, Noelia
Bürgi, Thomas 
Category: Research Article
Keywords: metal exchange; thiolate ligands; gold clusters; gold; silver clusters; in situ XAFS
Issue Date: 2018
Journal: Physical Chemistry Chemical Physics
The fast metal exchange reaction between Au38 and AgxAu38-x nanoclusters in solution at -20˚C has been studied by in situ X-ray absorption spectroscopy (time resolved quick EXAFS) in transmission mode. A cell was designed for this purpose consisting of a cooling system, remote injection and mixing devices. The capability of the set-up is demonstrated for second and minute time scale measurements of the metal exchange reaction upon mixing Au38/toluene and AgxAu38-x /toluene solutions at both Ag K-edge and Au L3-edge. It has been proposed that the exchange of gold and silver atoms between the clusters occurs via the SR(-M-SR)n (n=1,2; M=Au, Ag) staple units in the surface of the reacting clusters during their collision. However, at no point during the reaction (before, during, after) evidence is found for cationic silver atoms within the staples. This means that either the exchange occurs directly between the cores of the involved clusters or the residence time of the silver atoms in the staples is very short in a mechanism involving the metal exchange within the staples.
DOI: 10.1039/C7CP08272J
Library ID: AC15466768
URN: urn:nbn:at:at-ubtuw:3-5891
ISSN: 1463-9084
Organisation: E165 - Institut für Materialchemie 
Publication Type: Article
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