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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
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Nitrogen fixation revisited on iron(0) dinitrogen phosphine complexes.

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Protonation of iron-dinitrogen complexes primarily occurs at the metal center, forming hydride complexes. However, specific silylating agents can functionalize the dinitrogen ligand, leading to ammonium formation after acid treatment.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Nitrogen Fixation Research

Background:

  • Iron-dinitrogen complexes are crucial in understanding nitrogen fixation.
  • Previous studies suggested ammonium formation upon acid treatment of these complexes.

Purpose of the Study:

  • To reinvestigate the reaction of iron-dinitrogen complexes with acids.
  • To explore the reactivity of dinitrogen ligands with electrophilic reagents.

Main Methods:

  • Treatment of [Fe(N2)(PP)2] (PP = depe, dmpe) with acids and methylating agents.
  • Characterization of reaction products using 15N NMR spectroscopy.

Main Results:

  • Acid treatment led to metal center protonation and hydride complex formation, not ammonium.
  • Methylation occurred at the metal center with methyl triflate/tosylate.
  • Trimethylsilyl triflate reacted with the dinitrogen ligand, yielding ammonium after acid treatment.
  • Hydrazine and ammonia complexes were identified as byproducts.

Conclusions:

  • The site of electrophilic attack on iron-dinitrogen complexes depends on the electrophile.
  • Dinitrogen ligand reactivity can be modulated, offering new pathways for nitrogen transformation.