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Keywords:

  • coordination chemistry;
  • nitrogen;
  • radical complexes;
  • rare-earth metals;
  • superoxide analogues
Thumbnail image of graphical abstract

The unexpected stability of the exotic N2.3− species has been observed in its complexes with Dy3+ and Y3+. The three-electron reduction product of N2 is isoelectronic with superoxide O2.− (see scheme) and is a possible bound intermediate in the conversion of N2 into NH3.