Poly[[aqua­(μ(7)-biphenyl-3,3′,4,4′-tetra­carboxyl­ato)(1,10-phenanthroline)dicobalt(II)] monohydrate]

In the title compound, {[Co(2)(C(16)H(6)O(8))(C(12)H(8)N(2))(H(2)O)(2)]·H(2)O}(n), one Co(II) ion has a {CoN(2)O(4)} distorted octa­hedral environment defined by two N atoms of one 1,10-phenanthroline (phen) ligand, three O atoms of the carboxyl­ate groups of three biphenyl-3,3′,4,4′-tetra­carboxyl­ate (BPTC) ligands, one of which is bidentate, and one O atom from one coordinated water mol­ecule. The other Co(II) atom is surrounded by six O atoms from four different BPTC ligands and one coordinated water mol­ecule. Each BPTC ligand forms eight coordination bonds with seven Co(II) atoms, leading to a layer structure along the ac plane. Uncoordinated water mol­ecules occupy the space between the layers, and inter­act via inter­layer O—H⋯O hydrogen bonds along the b axis, generating a three-dimensional supra­molecular network.