Poly[bis(4,4′-bipyridine)(μ3-4,4′-dicarboxybiphenyl-3,3′-dicarboxylato)cobalt(II)

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The title cobalt(II) coordination polymer, [Co(C16H8O8)(C10H8N2)2]n, was obtained by the reaction of Co(OAc)2·4H2O (OAc is acetate), 4,4′-bipyridine (4,4′-bpy) and biphenyl-3,4,3′,4′-tetra­carboxylic acid (H4L) under hydro­thermal conditions. Each CoII atom lies at the centre of a distorted octa­hedron, coordinated by four O atoms from three H2L2− and two N atoms from two monodentate 4,4′-bpy ligands. Each H2L2− ligand coordinates to three CoII centres through two carboxyl­ate groups, one acting as a bridging bidentate group and the other in a chelating bidentate fashion. Two Co atoms, two H2L2− and four 4,4′-bpy ligands form a ring dimer node, and these nodes link into an extended broad chain along the c axis.