Homoleptic Silver-Rich Trimetallic M₂₀ Nanocluster

Area of Science:

• Inorganic Chemistry
• Materials Science
• Nanotechnology

Background:

• M20 nanoclusters (NCs) are a class of metal clusters with unique properties.
• Silver-rich NCs offer potential for various applications, including catalysis and medicine.

Purpose of the Study:

• To synthesize and characterize novel silver-rich M20 alloy nanoclusters.
• To investigate the structural preferences of Group 11 metals within these NCs.
• To evaluate the antioxidant capabilities of the synthesized NCs.

Main Methods:

• Synthesis of M20 nanoclusters using specific ligands.
• Characterization using electrospray ionization mass spectrometry (ESI-MS).
• Structural determination via Nuclear Magnetic Resonance (NMR) spectroscopy and X-ray crystallography.

Main Results:

• Successful synthesis of two silver-rich M20 NCs: [Cu3.5Ag16.5{S2P(OPr)2}12] (1) and [Cu2.5AuAg16.5{S2P(OPr)2}12] (2).
• Cluster 2 represents the first structurally characterized trimetallic M20 NC, achieved by doping gold into a bimetallic NC.
• Structural analysis revealed preferred positions for Group 11 metals (Cu, Ag, Au).
• Time-dependent UV-vis spectroscopy demonstrated that the presence of Cu(I) atoms enhances the antioxidant ability of the NCs.

Conclusions:

• The study successfully synthesized and characterized novel silver-rich M20 alloy nanoclusters.
• The incorporation of gold led to the first structurally defined trimetallic M20 NC.
• Copper(I) atoms significantly improve the antioxidant capacity of these M20 nanoclusters, suggesting potential applications where oxidative stability is crucial.