Poly[[penta-aqua-(μ(4)-pyridine-2,4,6-tri-carboxyl-ato)(μ(3)-pyridine-2,4,6-tri-carboxyl-ato)disamarium(III)] mono-hydrate].

The asymmetric unit of the title compound, {[Sm(2)(C(8)H(2)NO(6))(2)(H(2)O)(5)]·H(2)O}(n), contains two independent Sm(III) ions, two pyridine-2,4,6-tricarboxyl-ate (ptc) ligands, five aqua ligands and one lattice water mol-ecule. One Sm(III) ion is nine-coordinated by one N and five O atoms from the three ptc ligands and three aqua ligands in a distorted monocapped square antiprismatic geometry, and the other is eight-coordinated by one N and five O atoms from three ptc ligands and two aqua ligands in a 4,4'-bicapped trigonal anti-prismatic geometry. The ptc ligands brigde the Sm(III) ions into a three-dimensional polymeric framework. Extensive O-H⋯O hydrogen bonding is observed in the crystal structure.