Bis(2-amino-4-methyl­pyrimidin-3-ium) trans-diaqua­bis­(pyrazine-2,3-di­car­boxylato)cobaltate(II) hexa­hydrate

In the crystal structure of the mononuclear title compound, (C(5)H(8)N(3))(2)[Co(C(6)H(2)N(2)O(4))(2)(H(2)O)(2)]·6H(2)O or (ampymH)(2)[Co(pyzdc)(2)(H(2)O)(2)]·6H(2)O (ampym = 2-amino-4-methyl pyrimidine, pyzdcH(2) = pyrazine-2,3-dicarb­oxy­lic acid), the Co(II) ion is hexa­coordinated by two (pyzdc)(2−) groups in the equatorial plane and two water mol­ecules in axial positions, giving an N(2)CoO(4) 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.