The syntheses, crystal structures, electrochemical and magnetic properties of tri-nuclear cyanide-bridged complexes [cis-MII(bpy)2(CN)2]2MnIII(salcy) (PF6) (M = Fe, Ru, Os)

Abstract

Three tri-nuclear cyanide-bridged heteronuclear complexes, [cis-M^II(bpy)₂(CN)₂]₂Mn^III(salcy)(PF₆) (M = Fe, 1; M = Ru, 2; M = Os, 3; bpy = 2,2′-bipyridine, salcy = N,N′-(1,2-cyclohexanediylethylene) bis(salicylideneiminato) dianion) were synthesized by reaction of cis-M^II(bpy)₂(CN)₂ (M = Fe, Ru, Os) with [Mn^III(salcy)]⁺ ion in the presence of NH₄PF₆, respectively. Complexes 1–3 were all fully characterized by IR, UV, MS, elemental analysis and single-crystal X-ray diffraction analysis. The magnetic susceptibilities of complexes 1–3 were measured and analyzed, and complexes 1 and 2 show low temperature antiferromagnetic order, which were confirmed by FC–ZFC (field-cooled and zero-field-cooled) measurement. This work demonstrates that the diamagnetic metal ions M^II (M = Fe, Ru and Os) have effective influence on the magnetic properties of the cyanide-bridged complexes [cis-M^II(bpy)₂(CN)₂]₂Mn^III(salcy) (PF₆).