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In the crystal structure of the title compound, [Ni(C6H4N2O4S)(H2O)3]·2.5H2O, the NiII atom is six-coordinated by one 2-(6-oxido-4-oxo-3,4-dihydro­pyimidin-2-ylsulfan­yl)­acetate ligand and three water mol­ecules. Hydrogen-bonding inter­actions between the coordinated and uncoordinated water mol­ecules and between the water mol­ecules and the organic ligand result in a three-dimensional network structure. [ABSTRACT FROM AUTHOR]

In the title compound, {[Co(C8H4O5)(C10H8N2)]·2H2O]} n or {[Co(OH-BDC)(2,2′-bipy)]·2H2O]} n (where OH-H2BDC is 5-hydroxy­isophthalic acid and 2,2′-bipy is 2,2′-bipyridine), the Co atoms are chelated by two N atoms from the 2,2′-bipy ligand and by four O atoms from OH-BDC ligands in a highly distorted octa­hedral geometry. OH-BDC acts as a tetra­dentate ligand, with one carboxyl­ate group chelating one Co atom and the other binding in a monodentate fashion to two other Co atoms to form a one-dimensional zigzag chain. In the crystal structure, one of the solvent water mol­ecules lies on a crystallographic twofold axis. The one-dimensional mol­ecular chains are assembled into a two-dimensional network via O—H⋯O hydrogen-bonding inter­actions, while π–π stacking inter­actions generate a three-dimensional open framework between the two-dimensional networks. [ABSTRACT FROM AUTHOR]