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Keywords:

  • density functional calculations;
  • iron;
  • magnesium;
  • manganese;
  • metal-metal interactions
Thumbnail image of graphical abstract

Not just any old iron! The reduction of a bulky guanidinato iron(II) bromide complex yields a three-coordinate iron(I) dimer that possesses the shortest Fe–Fe interaction (2.127 Å) reported to date. Magnetic, Mössbauer, and computational studies show the unprecedented compound to contain two high-spin iron(I) centers with significant multiple-bond character. A related dimer containing a rare example of an unsupported, carbonyl-free Mn[BOND]Mn bond is also described.