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Related Experiment Video

Updated: Nov 18, 2025

Millifluidics for Chemical Synthesis and Time-resolved Mechanistic Studies
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Millifluidics for Chemical Synthesis and Time-resolved Mechanistic Studies

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Interdependence between nanoclusters AuAg24 and Au2Ag41.

Danyu Liu1,2, Wenjun Du1,2, Shuang Chen3

  • 1Department of Chemistry and Centre for Atomic Engineering of Advanced Materials, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Anhui University, Hefei, Anhui, People's Republic of China.

Nature Communications
|February 4, 2021
PubMed

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Summary

This study reveals a novel interdependent bi-nanocluster system of gold-silver nanoparticles. Two oppositely charged nanoclusters, AuAg24(SR)18- and Au2Ag41(SR)26(Dppm)2+, protect each other, enhancing stability.

Area of Science:

  • Nanomaterials Science
  • Inorganic Chemistry
  • Physical Chemistry

Background:

  • Probing competing or coexisting effects in nanoparticle synthesis and growth is challenging.
  • Ultra-small, atomically precise nanoclusters offer unique properties but their stability is often limited.
  • Understanding the formation mechanisms of complex nanocluster systems is crucial for their application.

Purpose of the Study:

  • To elucidate the coexistence mechanism of two distinct ultra-small, atomically precise gold-silver nanoclusters.
  • To establish an interdependent bi-nanocluster system for enhanced stability.
  • To explore the role of ligands in nanocluster formation and stabilization.

Main Methods:

  • Synthesis of a bi-nanocluster system comprising AuAg24(SR)18- and Au2Ag41(SR)26(Dppm)2+.

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  • Characterization using single crystal X-ray diffraction (SC-XRD).
  • Investigation of the formation mechanism involving unstable intermediates and ligand-assisted conversion.

    • Main Results:

    • A stable bi-nanocluster system was successfully established.
    • The mechanism involves the formation of AuAg24(SR)18- followed by conversion to Au2Ag41(SR)26(Dppm)2+ in the presence of di-phosphorus ligands.
    • Oppositely charged nanoclusters were found to protect each other from decomposition.
    • Co-crystallization yielded single crystals with equimolar amounts of both nanoclusters.

    Conclusions:

    • The interdependent relationship between oppositely charged nanoclusters enhances overall system stability.
    • This finding provides new perspectives on nanocluster formation, coexistence, and stability.
    • The study demonstrates a novel strategy for stabilizing ultra-small nanoclusters through mutual protection.