Poly[[penta­aqua­(μ(4)-pyridine-2,4,6-tri­carboxyl­ato)(μ(3)-pyridine-2,4,6-tri­carboxyl­ato)disamarium(III)] mono­hydrate]

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-tricarboxyl­ate (ptc) ligands, five aqua ligands and one lattice water mol­ecule. 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 anti­prismatic 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.