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A Simple, Air Stable Single-Ion Source of Iron(I).

Luise Kink1, Robert Kruk1, Oliver P E Townrow1

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Researchers developed a stable iron(I) arene complex, [Fe(durene)2]+, providing a new, reductant-free precursor for synthesizing diverse iron(I) compounds and catalysts.

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Area of Science:

  • Inorganic chemistry
  • Organometallic chemistry
  • Catalysis

Background:

  • Iron complexes in the +1 oxidation state show promise as catalysts for chemical transformations, offering a sustainable alternative to noble metals.
  • Accessing iron(I) compounds typically requires strong reducing agents, limiting their synthetic utility and availability.
  • A stable, readily accessible iron(I) starting material is crucial for expanding its catalytic applications.

Purpose of the Study:

  • To synthesize and characterize a stable iron(I) arene complex, [Fe(durene)2]+, as a versatile precursor.
  • To demonstrate the utility of this precursor for accessing a library of iron(I) compounds without using reductants.
  • To showcase the potential of this iron(I) source for in situ catalyst generation and high-throughput experimentation.

Main Methods:

  • Synthesis of the air-stable iron(I) arene complex [Fe(durene)2]+.
  • Characterization of the synthesized complex using spectroscopic and analytical techniques.
  • Reactivity studies to demonstrate modular synthesis of various iron(I) compounds and in situ catalyst generation.

Main Results:

  • The air-stable iron(I) arene complex [Fe(durene)2]+ was successfully synthesized and characterized.
  • This complex serves as a single-source precursor, enabling the modular synthesis of diverse iron(I) compounds, including novel ones.
  • The precursor was effectively used for in situ generation of highly active iron(I) catalysts, demonstrating its catalytic potential.

Conclusions:

  • [Fe(durene)2]+ is the first stable synthetic starting point for iron(I) chemistry.
  • This breakthrough circumvents the need for strong reducing agents, simplifying access to iron(I) compounds.
  • The developed precursor offers significant potential for advancing iron-based catalysis and high-throughput screening.