Poly[[bis­{μ₂-1,2-bis­[(1H-imidazol-1-yl)meth­yl]benzene}(μ₄-9,10-dioxo-9,10-dihydro­anthracene-1,4,5,8-tetra­carbox­yl­ato)dicobalt(II)] dihydrate]

The title complex, {[Co₂(C₁₈H₄O₁₀)(C₁₄H₁₄N₄)₂]·2H₂O}_n was synthesized from CoCl₂·6H₂O, 9,10-dioxo-9,10-dihydro­anthracene-1,4,5,8-tetra­carb­oxy­lic acid (H₄AQTC) and 1,2-bis­[(1H-imidazol-1-yl)meth­yl]benzene (o-bix) in water. The anthraquinone unit is located about a crystallographic center of inversion. Each asymmetric unit therefore contains one Co^II atom and one o-bix ligand, as well as half an AQTC⁴⁻ ligand and an additional solvent water mol­ecule. The Co^II ions are tetra­hedrally surrounded by two O atoms from two AQTC⁴⁻ anions and by two N atoms from two o-bix ligands, forming a two-dimensional coordination polymer. The solvent water mol­ecules are connected to the carboxyl­ate groups by O—H...O hydrogen bonds. Additional weak C—H...O hydrogen bonds are observed in the crystal structure.

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).