Poly[[(μ(2)-benzene-1,3-di­carboxyl­ato){μ(2)-1,4-bis­[(1H-imidazol-1-yl)meth­yl]benzene}­cadmium] di­methyl­formamide monosolvate]

The title coordination polymer, {[Cd(C(8)H(4)O(4))(C(14)H(14)N(4))]·C(3)H(7)NO}(n), was synthesized by solvothermal reaction of metallic cadmium with the semi-rigid neutral ligand 1,4-bis­[(1H-imidazol-1-yl)meth­yl]benzene (bix) and the V-shaped benzene-1,3-di­carb­oxy­lic acid (m-H(2)bdc). The structure exhibits a pseudo-C-centring which is almost fulfilled by the polymeric metal complex but not by the solvent dimethylform­amide (DMF) mol­ecules. The asymmetric unit contains two independent Cd(II) ions, two m-bdc(2−) ligands, one and two half bix ligands, and two solvent DMF mol­ecules. The Cd(II) ions are both five-coordinated by three O atoms from two different m-bdc(2−) ligands and two N atoms from two different bix ligands in a distorted square-pyramidal geometry. The m-bdc(2−) ligands adopt a chelate-monodentate coordination mode, connecting neighboring Cd(II) ions into a zigzag chain parallel to [110]. Adjacent chains are further cross-linked by bix ligands, giving rise to a puckered sheet nearly perpendicular to the chain direction. Thus, each Cd(II) ion is connected to four neighboring Cd(II) ions through two m-bdc(2−) anions and two bix ligands, giving rise to the final non-inter­penetrating uninodal layer with sql (4,4) topology.