Bis(1-ethyl-4,4′-bipyridin-1-ium) bis­(1,2-di­cyano­ethene-1,2-di­thiol­ato-κ²S,S′)nickelate(II)

In the anion of the title compound, (C₁₂H₁₃N₂)[Ni(C₄N₂S₂)₂], the Ni^II atom is coordinated by four S atoms from two 1,2-di­cyano­ethene-1,2-di­thiol­ate (mnt) ligands in a suqare-planar geometry. Weak C—H...N and C—H...S hydrogen bonds between the 1-ethyl-4,4′-bipyridin-1-ium cations and mnt anions and weak π–π inter­actions between the pyridine rings of the cations [centroid–centroid distances = 3.808 (3) and 3.972 (3) Å] lead to a two-dimensional network parallel to (010).

Poly[[(μ₂-benzene-1,3-di­carboxyl­ato){μ₂-1,4-bis­[(1H-imidazol-1-yl)meth­yl]benzene}­cadmium] di­methyl­formamide monosolvate]

The title coordination polymer, {[Cd(C₈H₄O₄)(C₁₄H₁₄N₄)]·C₃H₇NO}_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-H₂bdc). 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-bdc²⁻ 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-bdc²⁻ ligands and two N atoms from two different bix ligands in a distorted square-pyramidal geometry. The m-bdc²⁻ 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-bdc²⁻ anions and two bix ligands, giving rise to the final non-inter­penetrating uninodal layer with sql (4,4) topology.

1-(2,6-Diiso­propyl­phen­yl)-1H-benzimidazole

In the title compound, C₁₉H₂₂N₂, both the benzimidazole unit and the 2,6-diiso­propyl­phenyl group are essentially planar [maximum deviations from the least-squares planes of 0.005 (1) and 0.009 (1) Å, respectively]. The dihedral angle between the two planes is 79.6 (7)°. In the crystal, mol­ecules are linked into chains along the a-axis direction by weak C—H...N inter­actions. The crystal structure also features C—H...π inter­actions, which link the chains into a three-dimensional network.