Hydroxonium creatininium bis­(pyridine-2,6-dicarboxyl­ato-κ(3) O (2),N,O (6))cobaltate(II) trihydrate

The title compound, (C(4)H(8)N(3)O)(H(3)O)[Co(C(7)H(3)NO(4))(2)]·3H(2)O, contains a protonated creatininium cation, a hydrox­onium (H(3)O)(+) cation, a [Co(pydc)(2)](2−) (pydcH(2) = pyridine-2,6-dicarboxylic acid) complex anion, and three uncoordinated water mol­ecules. The Co(II) atom is coordinated by four O and two N atoms from two pydc ligands in a distorted octa­hedral environment. The structure also contains three uncoordinated water mol­ecules. Extensive inter­molecular O—H⋯O, N—H⋯O and C—H⋯O hydrogen bonds, π–π stacking inter­actions [centroid–centroid distances = 3.565 (14) and 3.425 (14) Å] and O⋯π inter­actions [O⋯centroid distance = 3.480 (2) Å] connect the various components in the crystal structure.