Poly[[tetra­aqua­tetra­kis­[μ(3)-5-(pyridine-4-carboxamido)­isophthalato]nickel(II)diterbium(III)] tetra­hydrate]

In the title compound, {[NiTb(2)(C(14)H(8)N(2)O(5))(4)(H(2)O)(4)]·4H(2)O}(n), the Tb(III) ion is coordinated by one water mol­ecule and seven O atoms from four 5-(pyridine-4-carboxamido)­isophthalate (L) ligands in a distorted square-anti­prismatic arrangement, while the Ni(II) ion, lying on an inversion center, is six-coordinated in an octa­hedral geometry by two pyridine N atoms, two carboxyl­ate O atoms and two water mol­ecules. One L ligand bridges two Tb(III) ions and one Ni(II) ion through two carboxyl­ate groups and one pyridine N atom. The other L ligand bridges two Tb(III) ions and one Ni(II) ion through two carboxyl­ate groups, while the uncoordinating pyridine N atom is hydrogen bonded to an adjacent coordinating water mol­ecule. Extensive O—H⋯O, N—H⋯O and O—H⋯N hydrogen bonds play an important role in stabilizing the crystal structure.