| Summary: | In the crystal structure of the mononuclear title compound, (C5H8N3)2[Co(C6H2N2O4)2(H2O)2]·6H2O or (ampymH)2[Co(pyzdc)2(H2O)2]·6H2O (ampym = 2-amino-4-methyl pyrimidine, pyzdcH2 = pyrazine-2,3-dicarboxylic acid), the CoII ion is hexacoordinated by two (pyzdc)2− groups in the equatorial plane and two water molecules in axial positions, giving an N2CoO4 bound set. The (pyzdc)2− anion acts as a bidentate ligand through one carboxylate group O atom and pyrazine ring N atom. There are diverse N—H... O and O—H...O and O—H...N hydrogen-bonding interactions, which lead to the formation of a three-dimensional supramolecular architecture. Off-set or slipped π–π stacking interactions are also observed between adjacent pyrimidine rings with face-to-face distances of 3.6337 (9) Å.
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