(2,2'-Bi­pyridine)­bis­(hydrogen isophthalato)­zinc(II)

In the title compound, [Zn(C₈H₅O₄)₂(C₁₀H₈N₂)], the Zn^II ion is located on a crystallographic twofold axis, which passes through the mid-point of the C-C bond of the bpy ligand. The Zn atom is four-coordinated by two carboxyl­ate O atoms from two symmetry-related hydrogen isophthalate ligands [Zn-O = 1.972 (5) Å] and two N atoms from 2,2'-bi­pyridine ligand [Zn-N = 2.067 (5) Å] to furnish a distorted tetrahedral geometry.

Tetra­aqua­bis(4,6-dioxidopyrimidin-1-ium-κ³N)cobalt(II)

In the title complex, [Co(C₄H₃N₂O₂)₂(H₂O)₄], the central Co^II ion is located at an inversion centre and is coordinated by two N atoms from 4,6-dihydroxy­pyrimidine ligands and four O atoms from water mol­ecules in an approximately octa­hedral geometry. This discrete structure is further extended into a three-dimensional supramolecular structure via weak hydrogen bonds.