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Keywords:

  • CO analogues;
  • coordination chemistry;
  • Group 13 elements;
  • halides;
  • subvalent compounds
Thumbnail image of graphical abstract

EX-traordinary alternative: The first structurally characterized complex, [Cp*Fe(dppe)(GaI)]+ (Cp*=C5Me5, dppe=1,2-bis(diphenylphosphanyl)ethane), in which a diatomic molecule (EX) from elements of Group 13 (E) and 17 (X) is coordinated to a transition-metal fragment, is the most recent contribution to the long-lasting debate about the analogies between CO and EX. The picture shows the molecular structure of the complex cation with a terminal GaI group.