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Keywords:

  • cobalt;
  • iron;
  • mass spectrometry;
  • self-assembly;
  • spin states
Thumbnail image of graphical abstract

Two iron/cobalt mixed-valence clusters were synthesized using multidentate polypyridyl ligands (see picture: FeII orange, FeIII yellow, CoII blue, O red). A heptanuclear helix and a [3×3] grid complex form depending on the metal ion stoichiometry. ESI-MS measurements suggest that the helical cluster is an intermediate to the grid complex.