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In the title compound, [Eu(C8H6NO2)3(H2O)]n, the europium(III) ion is coordinated by eight carboxylate O atoms and one water molecule. The carboxylate ligands bridge pairs of europium(III) ions, forming a zigzag chain along [100]; hydrogen bonds link the chains into sheets parallel to (001). [ABSTRACT FROM AUTHOR]

The Co atom in the title compound, [Co(C6H5N2O4)2(H2O)2], is located on an inversion centre and exhibits a distorted octahedral geometry. It is trans coordinated by two N, O-bidentate 5-carboxy-2-methyl-1 H-imidazole-4-carboxylate monoanionic ligands with two water molecules in the axial positions. Each ligand is stabilized by a strong, almost symmetrical, hydrogen bond. Intermolecular N—H...O hydrogen bonds link the molecules into layers, which are further linked into a three-dimensional supramolecular framework through O—H...O hydrogen-bonding interactions involving the water molecules. [ABSTRACT FROM AUTHOR]