Bis(2-amino-4-methylpyrimidin-1-ium) hexaaquacobalt(II) disulfate dihydrate

Abstract

In the title hydrated mixed-cation salt, (C5H8N3)2[Co(H2O)6](SO4)2·2H2O, the complete octahedral hexaaqua complex cation is generated by crystallographic inversion symmetry. In the crystal, the components are linked by O—H...O and N—H...O hydrogen bonds, the latter, involving pyrimidinium cations and sulfate anions, generating R22(8) loops. These, together with π–π interactions between centrosymmetrically related pyrimidinium cations [centroid–centroid separation = 3.5460 (8) Å], lead to the formation of a three-dimensional network.