Poly[[trans-diaquabis(μ2-biphenyl-2,2′-dicarboxylato)bis(μ2-4,4′-bipyridine)dicobalt(II)]biphenyl-2,2′-dicarboxylic acid disolvate]

In the title compound, {[Co-2(C14H8O4)(2)(C10H8N2)(2)(H2O)(2)]center dot-2C(14)H(10)O(4)}(n), each Co-II ion is six-coordinate in a slightly distorted octahedral geometry. Both Co-II ions are located on twofold axes. One is surrounded by two O atoms from two biphenyl-2,2'-dicarboxylate (dpa) dianions, two N atoms from two 4,4'-bipyridine (bpy) ligands and two water molecules, while the second is surrounded by four O atoms from two dpa dianions and two N atoms from two bpy ligands. The coordinated dpa dianion functions as a kappa(3)-bridge between the two Co-II ions. One carboxylate group of a dpa dianion bridges two adjacent Co-II ions, and one O atom of the other carboxylate group also chelates to a Co-II ion. The Co-II ions are bridged by dpa dianions and bpy ligands to form a chiral sheet. There are several strong intermolecular hydrogen bonds between the H(2)dpa solvent molecule and the chiral sheet, which result in a sandwich structure.