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Keywords:

  • iron;
  • magnetic properties;
  • polymorphism;
  • S ligands;
  • spin crossover
Thumbnail image of graphical abstract

Round and round: A mononuclear FeII complex (see picture) with an N4S2 coordination set has been characterized in four polymorphic forms. Two of the polymorphs display four-site cooperative spin crossover (SCO), shown conclusively by the crystal structure of a fully ordered 1:3 high-spin/low-spin state. The presence of S donor atoms in SCO-active compounds is unusual, and further investigation of FeII complexes for SCO activity is warranted.