(2-Amino-7-methyl-4-oxido­pteridine-6-carboxyl­ato-κ3 O 4,N 5,O 6)aqua(1,10-phen­an­thro­line-κ2 N,N′)cobalt(II) trihydrate

In the title compound, [Co(C8H5N5O3)(C12H8N2)(H2O)]·3H2O, a tridentate 2-amino-7-methyl-4-oxidopteridine-6-carboxyl-ate ligand, a bidentate ancillary 1,10-phenanthroline (phen) ligand and a water mol-ecule complete a distorted octa-hedral geometry around the Co(II) atom. The pterin ligand forms two chelate rings. The phen and pterin ring systems are nearly perpendicular [dihedral angle = 85.15 (8)°]. N-H⋯O, O-H⋯N and O-H⋯O hydrogen bonds link the complex mol-ecules and lattice water mol-ecules into a layer parallel to (001). π-π stacking contacts (involving phen-phen and pteridine-pteridine) are also observed [centroid-centroid distances = 3.670 (2), 3.547 (2), 3.698 (2) and 3.349 (2) Å].