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Keywords:

  • carbonyls;
  • complexes;
  • electronic structure;
  • magnetism;
  • transition metals
Thumbnail image of graphical abstract

The most stable unsaturated Fe2(CO)n (n=1–8) complexes have terminal carbonyls. A stepwise CO coordination takes place first on one Fe center [Fe[BOND]Fe(CO)4] and then on the second one [(CO)4Fe[BOND]Fe(CO)4].