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 O_w—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.