Poly[[diaqua-(1,10-phenanthroline-κN,N')(μ(3)-4-sulfonato-benzene-1,2-dicarboxyl-ato-κO:O,O:O)dysprosium(III)] dihydrate].

The 4-sulfophthalate trianion in the polymeric title complex, {[Dy(C8H3O7S)(C12H8N2)(H2O)2]·2H2O}n, bridges three water/phenanthroline-coordinated DyIII atoms to form a three-dimensional network architecture. The metal atom is further chelated by a carboxyl­ate group and is covalently bonded to a monodentate carboxyl­ate group and to a monodentate sulfonate group in a distorted square-anti­prismatic geometry. The coordinating and the solvent water mol­ecules are hydrogen bonded to the network. In the crystal, one solvent water mol­ecule is disordered over two positions [major component = 59 (3)%].