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Keywords:

  • ENDOR;
  • hydrides;
  • iron;
  • magnetism;
  • nitrogenases
Thumbnail image of graphical abstract

Three's company: Iron(I) hydride complexes are presented (see picture; N blue, O red) that are the first monomeric open-shell hydride complexes to be crystallographically verified as being three-coordinate at the metal. Backbonding into diketiminate π* orbitals stabilizes the low oxidation state. The Fe[BOND]H bonding has been analyzed using electron-nuclear double resonance (ENDOR).