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Keywords:

  • cobalt;
  • electronic structure;
  • high-spin complexes;
  • iron;
  • square-planar complexes
Thumbnail image of graphical abstract

It's hip to be square: Two high-spin, square-planar {MO4} complexes are prepared, including the first molecular example with M=CoII (see structure). Structural, spectroscopic, and magnetic susceptibility characterization allows a description of the ligand features required for this highly unusual electronic structure.