Tetrameric spin crossover iron(II) complex constructed by imidazole···chloride hydrogen bonds

A tetrameric spin crossover (SCO) FeII complex was synthesized, and the structure and magnetic properties were studied. The tetrameric structure is constructed by four imidazole···Cl− hydrogen bonds centered at one Cl− ion. The compound showed an incomplete gradual SCO behavior due to intra-cluster “anticooperative-like“ interaction.