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Constructing Functional Radiation-Resistant Thorium Clusters for Catalytic Redox Reactions.

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This study introduces novel radiation-resistant thorium clusters as catalysts for redox reactions. These thorium catalysts maintain their structure and activity under gamma irradiation, enabling efficient organic transformations.

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Area of Science:

  • Catalysis
  • Materials Science
  • Nuclear Chemistry

Background:

  • Catalytic reactions can be disrupted by radiation sources.
  • Thorium clusters show promise for radiation-resistant catalysis.
  • Research on radiation-stable thorium cluster catalysts is limited.

Purpose of the Study:

  • To engineer and fabricate novel radiation-resistant thorium cluster catalysts.
  • To investigate the photocatalytic and thermocatalytic properties of these thorium clusters.
  • To explore the application of these catalysts in organic transformations.

Main Methods:

  • Fabrication of three high-nuclear thorium cluster catalysts (ThL-MA, ThL-MA-BF, ThL-Fcc).
  • Irradiation of catalysts with 690 kGy gamma rays to assess stability.
  • Systematic investigation of photocatalytic and thermocatalytic activities.
  • Ligand engineering to modulate catalytic performance.
  • Density Functional Theory (DFT) calculations to elucidate catalytic mechanisms.

Main Results:

  • Thorium cluster catalysts exhibited excellent structural and compositional stability after gamma irradiation.
  • Gamma rays did not alter the catalytic activities of the thorium clusters.
  • Ligand engineering successfully modulated catalytic activity for reduction and oxidation reactions.
  • All organic transformation reactions achieved >80% conversion and nearly 100% product selectivity.
  • Synergistic catalysis involving thorium-oxo core and ligands generated active species and activated substrates.

Conclusions:

  • Developed the first radiation-resistant thorium cluster catalysts for efficient redox reactions.
  • Demonstrated the potential of ligand engineering to tune catalytic activity.
  • Provided design strategies for constructing high-nuclearity thorium clusters under mild conditions.
  • Expanded the catalytic applications of thorium clusters in organic synthesis.