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Keywords:

  • cobalt;
  • coordination polymers;
  • magnetic properties;
  • spin crossover;
  • symmetry breaking
Thumbnail image of graphical abstract

All in a spin: A cobalt(II) coordination polymer has a highly cooperative spin-crossover (SCO) behavior with a small hysteresis loop (see picture; HS=high spin, LS=low spin). The correlation of the magnetic properties with the crystal structures was determined at different temperatures. This study reveals an unprecedented reversible symmetry breaking in a d7 SCO coordination polymer.