Syntheses, Structures and Magnetic Properties of Two Coordination Polymers Based on 2,2-Biphenyldicarboxylate Ligand

Two coordination polymers {[Co3L3(Me2NH)(2)]center dot(Me2NH)}(n)(1) and [CuL(bpy)](n)(2)(L=2,2'-biphenyl dicarboxylate ion, bpy=4,4'-bipyridine) were obtained and characterized. Compound 1 was synthesised via solvothermal method, with the L ligands adopting syn-syn-mu(2)-eta(1):eta(1)- and mu(2)-eta(2)-coordination modes and Co(II) centers being linked to form a 1D coordination chain with trinuclear Co-3 cluster as sub-units. Compound 2 was synthesized at room temperature, with the L ligand chelating the Cu(II) centers to form a 1D chain, which was further linked by the auxiliary 4,4'-bpy ligand to form a 3D coordination network. The results of variable temperature susceptibility studies reveal that there were ferromagnetic and antiferromagnetic interactions between the paramagnetic metal centers in compounds 1 and 2, respectively.