AI Article Synopsis
- The synthesis of uniform alloy nanoclusters, particularly with similar-sized atoms like Ag and Au, is difficult.
- A new method called galvanic exchange is used to create a uniform Ag24Au cluster by modifying a pure Ag25 cluster template.
- Analysis of the Ag24Au cluster shows that replacing an Ag atom with Au impacts crystal structure and properties, highlighting how single-atom changes can influence cluster behavior.
Article Abstract
Synthesis of atom-precise alloy nanoclusters with uniform composition is challenging when the alloying atoms are similar in size (for example, Ag and Au). A galvanic exchange strategy has been devised to produce a compositionally uniform [Ag24Au(SR)18](-) cluster (SR: thiolate) using a pure [Ag25(SR)18](-) cluster as a template. Conversely, the direct synthesis of Ag24Au cluster leads to a mixture of [Ag(25-x)Au(x)(SR)18](-), x=1-8. Mass spectrometry and crystallography of [Ag24Au(SR)18](-) reveal the presence of the Au heteroatom at the Ag25 center, forming Ag24Au. The successful exchange of the central Ag of Ag25 with Au causes perturbations in the Ag25 crystal structure, which are reflected in the absorption, luminescence, and ambient stability of the particle. These properties are compared with those of Ag25 and Ag24Pd clusters with same ligand and structural framework, providing new insights into the modulation of cluster properties with dopants at the single-atom level.
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| http://dx.doi.org/10.1002/anie.201509381 | DOI Listing |
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