Poly[[diaquabis(2,2′-bipyridine-κ2N,N′)(μ3-5-hydroxyisophthalato-κ5O1,O1′:O3,O3′:O3′)(μ3-5-hydroxy­isophthalato-κ4O1,O1′:O3:O3′)(μ2-5-hydroxyisophthalato-κ3O1,O1′:O3)didysprosium(III)] dihydrate]

The polymeric title compound, {[Dy2(C8H4O5)3(C10H8N2)2(H2O)2]·2H2O}n, contains two independent DyIII ions, both of which are nine-coordinated in a distorted tricapped trigonal–prismatic geometry. One DyIII ion is coordinated by five 5-hy­droxy­isophthalate (hip) ligands and one 2,2′-bipyridine (bpy) ligand and the other by three hip ligands, one bpy ligand and two water mol­ecules. The DyIII ions are bridged by the carboxyl­ate groups of the hip ligands, forming a three-dimensional framework. O—H⋯O hydrogen bonds are present in the crystal structure.