Poly[[triaqua­(μ(3)-4-oxidopyridine-2,6-dicarboxyl­ato)terbium(III)] monohydrate]

In the title coordination polymer, {[Tb(C(7)H(2)NO(5))(H(2)O)(3)]·H(2)O}(n), the Tb(III) atom is eight-coordinated by a tridentate 4-oxidopyridine-2,6-dicarboxyl­ate trianion, two adjacent monodentate anions and three water mol­ecules, forming a distorted bicapped trigonal–prismatic TbNO(7) coordination environment. The anions bridge adjacent Tb(III) ions into double chains. Adjacent chains are further connected into sheets parallel to (10[Image: see text]). O—H⋯O hydrogen bonds involving both coordinated and uncoordinated water mol­ecules generate a three-dimensional network.