μ-2,5-Dihydroxyterephthalato-bis[triaqua(1,10-phenanthroline)zinc] dihydroxyterephthalate

In the title compound, [Zn2(C8H4O6)(C12H8N2)2(H2O)6](C8H4O6), the complete ions of both the binuclear dication and the dianion are generated by crystallographic inversion symmetry. The Zn atom is bonded to an N,N′-bidentate phenanthroline ligand, three water moleules and an O-monodenate 2,5-dihydroxyterephthalate dianion. In the resulting distorted octahedral ZnN2O4 coordination polyhedron, the water O atoms are in a mer orientation. Two intramolecular O—H...O hydrogen bonds occur in the bridging 2,5-dihydroxyterephthalate dianion within the complex cation and also in the free dianion. An intramolecular Ow—H...O (w = water) hydrogen bond also occurs within the dication. In the crystal, O—H...O hydrogen bonds link the component ions into a three-dimensional network