Poly[[tetra-aqua-bis-(μ(3)-imidazole-4,5-dicarboxyl-ato)tetra-kis-(μ(2)-imidazole-4,5-dicarboxyl-ato)tricobalt(II)dilutetium(III)] dihydrate].

In the title compound, {[Co(3)Lu(2)(C(5)H(2)N(2)O(4))(6)(H(2)O)(4)]·2H(2)O}(n), the Lu(III) ions are seven-coordinated in a monocapped trigonal prismatic coordination geometry by six O atoms from three imidazole-4,5-dicarboxyl-ate ligands and one water O atom. The Co(II) ions are six-coordinated in a slightly distorted octa-hedral geometry and exhibit two types of coordination environments. One Co(II) ion, located on an inversion center, is coordinated by two water O atoms as well as two O atoms and two N atoms from two imidazole-4,5-dicarboxyl-ate ligands. The other Co(II) ion is bonded to four O atoms and two N atoms from four imidazole-4,5-dicarboxyl-ate ligands. These metal coordination units are connected by bridging imidazole-4,5-dicarboxyl-ate ligands, generating a three-dimensional network. The crystal structure is further stabilized by N-H⋯O, O-H⋯O, and C-H⋯O hydrogen-bonding inter-actions between the water mol-ecules and the imidazole-4,5-dicarboxyl-ate ligands.