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Area of Science:

  • Inorganic Chemistry
  • Catalysis
  • Materials Science

Background:

  • Fe/Co6Se8 molecular clusters are investigated for catalytic applications.
  • Understanding substrate affinity is crucial for optimizing catalytic efficiency.

Purpose of the Study:

  • To determine the stereoelectronic requirements for achieving optimal substrate affinity in Fe/Co6Se8 clusters.
  • To explore the reactivity of iron-nitrenoid intermediates in catalytic coupling reactions.
  • To elucidate the role of isocyanide in catalyst stability and reactivity.

Main Methods:

  • In situ observation of catalytically competent iron-nitrenoid intermediates.
  • Investigation of nitrene transfer and hydrogen-atom abstraction pathways.
  • Analysis of the impact of distal structural modifications on catalytic performance.

Main Results:

  • A "Goldilocks regime" of substrate affinity was achieved for the coupling of tosyl azide and tert-butyl isocyanide.
  • Isocyanide was found to prevent catalyst degradation but can inhibit reactivity at high concentrations.
  • Distal changes in the catalyst structure significantly influenced substrate affinity, electronic properties, and catalytic activity.

Conclusions:

  • Dynamic interactions between the substrate, active site, and support are key to achieving high catalytic activity.
  • Optimized substrate activation coupled with facile dissociation is crucial for efficient catalysis.