Poly[tetra­deca­aqua­tetra­kis­(μ(3)-imidazole-4,5-dicarboxyl­ato)hexa-μ(3)-sulfato-cobalt(II)hexa­samarium(III)]

In the title three-dimensional compound, [CoSm(6)(C(5)H(2)N(2)O(4))(4)(SO(4))(6)(H(2)O)(14)](n), the Co(II) ion is six-coordinated with two O atoms and two N atoms from two imidazole-4,5-dicarboxyl­ate ligands and two coordinated water mol­ecules, giving a slightly distorted octa­hedral geometry. One Sm(III) ion is eight-coordinated in a bicapped trigonal–prismatic coordination geometry by four O atoms from two imidazole-4,5-dicarboxyl­ate ligands, two O atoms from two SO(4) (2−) anions and two coordinated water mol­ecules. The other two Sm(III) ions are nine-coordinated in a tricapped trigonal–prismatic coordination geometry; one of these Sm(III) ions is bonded to four O atoms from two imidazole-4,5-dicarboxyl­ate ligands, three O atoms from three SO(4) (2−) anions and two water O atoms, and the other Sm(III) ion is coordinated by one O atom and one N atom from one imidazole-4,5-dicarboxyl­ate ligand, five O atoms from three SO(4) (2−) anions, as well as two coordinated water mol­ecules. The crystal structure is further stabilized by N—H⋯O, O—H⋯O, and C—H⋯O hydrogen-bonding inter­actions.