Synthesis, structure and magnetic properties of pyrazolate-bridged dinuclear complexes [{M(NCS)(4-Phpy)}2(μ-bpypz)2] (M = Co2+ and Fe2+)

The dinuclear iron(II) complex [{Fe(NCS)(4-Phpy)}2(μ-bpypz)2] displays a single, sharp spin crossover transition between the [HS-HS] and [LS-LS] state with Tc = 150 K while no spin transition occurs in the corresponding cobalt(II) complex.