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Directional Doping and Cocrystallizing an Open-Shell Ag39 Superatom via Precursor Engineering.

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Summary

This study details the synthesis of novel silver nanoclusters and their copper-alloyed counterparts, revealing a unique core-shell structure. The findings highlight the critical role of copper precursors in directing nanocluster assembly and cocrystallization.

Keywords:
cocrystalcore−shell structuredopingelectronic structuremetal nanoclusters

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Inorganic Chemistry

Background:

  • Metal precursors are crucial for controlling the composition and structure of metal nanoclusters (NCs).
  • Multilayered noble metal NCs with unusual core-shell structures are of significant interest.

Purpose of the Study:

  • To synthesize and structurally characterize novel silver and silver-copper bimetallic nanoclusters.
  • To investigate the influence of metal precursors on nanocluster formation and cocrystallization.
  • To explore the electronic and optical properties of the synthesized nanoclusters.

Main Methods:

  • Bottom-up synthesis of metal nanoclusters using silver and copper precursors.
  • Isolation and structural characterization of nanoclusters using X-ray crystallography.
  • Theoretical calculations to analyze electronic structures.
  • Optical absorption spectroscopy to study photophysical properties.

Main Results:

  • A novel silver nanocluster, [Ag39(PFBT)24(TPP)8]2-, with a unique three-layered Ag13@Ag18@Ag8S24P8 core-shell structure was synthesized.
  • Introduction of a copper precursor yielded a bimetallic nanocluster, [Ag37Cu2(PFBT)24(TPP)8]2-, with a similar structure.
  • Alteration of the copper precursor led to the cocrystallization of the alloy nanocluster with a silver nanocluster.
  • The silver nanocluster was identified as a 17-electron open-shell superatom.

Conclusions:

  • The study successfully synthesized and characterized novel silver and silver-copper nanoclusters with unique structures.
  • Copper precursors play a critical role in directing the formation and cocrystallization of alloy nanoclusters.
  • The synthesized materials offer a platform for studying crystal growth and photophysical properties of metal nanoclusters.