Hydroxonium creatininium bis(pyridine-2,6-dicarboxylato-κ3O2,N,O6)cobaltate(II) trihydrate

The title compound, (C4H8N3O)(H3O)[Co(C7H3NO4)(2)]center dot 3H(2)O, contains a protonated creatininium cation, a hydroxonium (H3O)(+) 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 center dot center dot center dot O, N-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds, pi-pi stacking interactions [centroid-centroid distances = 3.565 (14) and 3.425 (14) angstrom] and O center dot center dot center dot pi interactions [O center dot center dot center dot centroid distance = 3.480 (2) angstrom] connect the various components in the crystal structure.