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Keywords:

  • clusters;
  • high-spin complexes;
  • iron;
  • Mössbauer spectroscopy;
  • sulfides
Thumbnail image of graphical abstract

The first examples of iron(I) sulfide complexes are presented, in contrast with the +2 and +3 oxidation states that are well-known in synthetic and biological systems. Spectroscopic and computational studies show a high-spin d7 configuration at the metal. Alkali metal cations play a key role in supporting the unusually low oxidation state.