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Area of Science:

  • Materials Science
  • Nanotechnology
  • Catalysis

Background:

  • Stabilizing metal clusters (MCs) across different solvents is challenging due to size perturbations.
  • Current ligand-binding methods can alter MCs' size when transferring between polar and nonpolar solvents.

Purpose of the Study:

  • To develop a method for stabilizing ultrasmall metal clusters (<1 nm) in both aqueous and hydrophobic phases.
  • To create a recyclable and switchable catalyst using size-stable metal clusters.

Main Methods:

  • Physically confining small noble metal clusters (<1 nm) within ionic organic cages (I-Cages).
  • Utilizing anion exchange within I-Cages for reversible transfer between aqueous and hydrophobic solutions.
  • Testing the catalytic activity of the MCs@I-Cage hybrid in ammonia borane (AB) hydrolysis.

Main Results:

  • Achieved reversible transfer of metal clusters between aqueous and hydrophobic solutions without size variation.
  • The MCs@I-Cage hybrid demonstrated high catalytic activity in NH3BH3 hydrolysis.
  • Reported a high turnover frequency (TOF) of 115 min⁻¹ for the catalytic reaction.

Conclusions:

  • Physical confinement within I-Cages offers a robust strategy for stabilizing ultrasmall metal clusters across diverse solvent environments.
  • The developed MCs@I-Cage hybrid system is a promising recyclable catalyst with significant potential for various applications.
  • This approach overcomes limitations of traditional ligand-based stabilization, enabling precise control over metal cluster properties.