Cyanide-bridged tri- and tetra-nuclear spin crossover complexes

Cyanide-bridged tri- and tetra-nuclear complexes, [Fe2IIIFeII(CN)6(tp∗)2(tpa)] · 4MeCN · t-BuMeO (1) and [Fe4II(CN)4(bpy)4(bpym)4](PF6)4 · 6MeOH · 4H2O (2) (tp∗ = hydrotris(dimethylpyrazolyl)borate, bpym = 2,2′-bipyrimidine), were synthesized. Compound 1 has a right angled trinuclear core composed of two [Fe(CN)3(tp∗)]− and one [Fe(tpa)]2+ units, while the tetra-nuclear complex in 2 has a square core composed of cyanide-bridged four Fe(II) ions. Magnetic susceptibility measurements revealed that both complexes showed thermally induced spin crossover.

Cyanide-bridged tri- and tetra-nuclear complexes of [Fe2IIIFeII(CN)6(tp∗)2(tpa)] · 4MeCN · t-BuMeO (1) and [Fe4II(CN)4(bpy)4(bpym)4](PF6)4 · 6MeOH · 4H2O (2) (tp∗ = hydrotris(dimethylpyrazolyl)borate, tpa = tris(2-pyridylmethyl)amine, bpy = 2,2′-bipyridine, bpym = 2,2′-bipyrimidine) were prepared. Compound 1 has a right angled trinuclear core, while the tetranuclear core in 2 is almost square. Magnetic susceptibility measurements revealed that both complexes showed thermally induced spin crossover.Figure optionsDownload as PowerPoint slide