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Related Experiment Video

Updated: Jun 9, 2026

A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions

A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions

Published on: February 5, 2016

Glutathione-stabilized magic-number silver cluster compounds.

Santosh Kumar¹, Michael D Bolan, Terry P Bigioni

¹Department of Chemistry, The University of Toledo, Toledo, Ohio 43606, USA.

Journal of the American Chemical Society

|September 9, 2010

Summary

This summary is machine-generated.

Magic-number theories explain stable silver clusters. These synthesized magic-numbered silver (Ag) clusters, ligated with glutathione (GSH), show molecular precision but differ from gold clusters, challenging current theories.

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Area of Science:

Nanotechnology
Materials Science
Physical Chemistry

Background:

Magic-number theories explain the stability of gas-phase clusters.
These theories are increasingly applied to condensed-phase gold (Au) clusters.
Generalizability to other elements like silver (Ag) requires testing.

Purpose of the Study:

To synthesize and characterize magic-numbered silver clusters.
To test the applicability of magic-number theories to silver clusters.
To compare silver clusters with existing gold cluster systems.

Main Methods:

Synthesis of silver clusters ligated with glutathione (GSH) via reduction of silver glutathiolate in water.
Separation of synthesized clusters using polyacrylamide gel electrophoresis (PAGE).
Analysis of optical absorption spectra and cluster size distribution.

Main Results:

A family of discrete Ag:SG clusters was synthesized and separated by PAGE.
Cluster positions and colors in PAGE were independent of reaction conditions, indicating molecular precision.
Absorption onsets decreased monotonically with increasing cluster size, with spectra showing single electron transitions.

Conclusions:

Synthesized Ag:SG clusters exhibit molecular precision, consistent with magic-number concepts.
Significant differences in cluster size distribution and optical spectra compared to Au:SG clusters were observed.
Current condensed-phase magic-number cluster theories may require refinement for systems like Ag:SG clusters.