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The title compound, [Zn(C7H5N6O)2(H2O)2]·2H2O, consists of one ZnII ion located on the crystallographic inversion centre, two 5-(pyridine-3-carboxamido)tetrazolide ligands, two coordinated water molecules and two free water molecules. The ZnII ion adopts a slightly distorted octahedral coordination geometry formed by the N,O-chelating ligands and two O water atoms. The pyridine N atoms are not coordinated. In the crystal, complex molecules are connected by N—H...O, O—H...N and O—H...O hydrogen bonds, forming a three-dimensional network.

In the title compound, [Co(C6H6N4)2(H2O)2](C16H8O8), the CoII cation and the organic anion occupy different crystallographic inversion centres and, as a consequence, the asymmetric unit comprises two half-molecules. The benzene groups are coplanar. The four coordinating N atoms of the two bidentate biimidazole ligands define the equatorial plane of a slightly distorted octahedral CoO2N4 geometry, and the water O atoms lie in the axial coordination sites. Translational (a,overline b) and inversion-related symmetry operations link the Co complex molecules and the negatively charged carboxylate anions via intermolecular N—H...O and O—H...O hydrogen bonds into sheets parallel to (overline{1}01). The coordinated water molecules connect the sheets through O—H...O hydrogen bonds, forming a three-dimensional framework. In addition, two intramolecular O—H...O hydrogen bonds are observed between the carboxyl and carboxylate groups.

In the title compound, [Zn(C6H6N4)2(H2O)2](C16H8O8), the ZnII atom, located on an inversion centre, is coordinated by two aqua and two bidentate biimidizole ligands, resulting in a slightly distorted octahedral ZnO2N4 geometry. The four N atoms from the two biimidizole ligands lie in the equatorial plane and the two aqua O atoms lie in the axial sites. The biphenyltetracarboxylate anion also lies on an inversion centre. The ZnII complex cation and the anion are held together by N—H...O hydrogen bonds, forming a zigzag chain along [2overline{1}1]. The chains are further connected by water molecules via O—H...O hydrogen bonds.