A novel cadmium(II) coordination polymer with biphenyl-3,3',4,4'-tetracarboxylic acid and 4,4'-bipyridine.

A novel cadmium(II) coordination polymer, poly[[[bis(4,4'-bipyridine)cadmium(II)]-mu(3)-4,4'-dicarboxybiphenyl-3,3'-dicarboxylato] 0.35-hydrate], {[Cd(C(16)H(8)O(8))(C(10)H(8)N(2))(2)].0.35H(2)O}(n), was obtained by reaction of Cd(CH(3)COO)(2).3H(2)O, 4,4'-bipyridine (4,4'-bpy) and biphenyl-3,3',4,4'-tetracarboxylic acid (H(4)L) under hydrothermal conditions. Each Cd(II) atom lies at the centre of a distorted octahedron, coordinated by four O atoms from three H(2)L(2-) ligands and N atoms from two monodentate 4,4'-bpy ligands. Each H(2)L(2-) ligand coordinates to three Cd(II) atoms through two carboxylate groups, one acting as a bridging bidentate ligand and the other in a chelating bidentate fashion. Two Cd atoms, two H(2)L(2-) anions and four 4,4'-bpy ligands form a ring dimer node, which links into an extended broad zonal one-dimensional chain along the c axis.