(2-Amino-7-methyl-4-oxido­pteridine-6-carboxyl­ato-κ³O⁴,N⁵,O⁶)aqua(1,10-phen­an­thro­line-κ²N,N′)cobalt(II) trihydrate

In the title compound, [Co(C₈H₅N₅O₃)(C₁₂H₈N₂)(H₂O)]·3H₂O, a tridentate 2-amino-7-methyl-4-oxidopteridine-6-carboxyl­ate ligand, a bidentate ancillary 1,10-phenanthroline (phen) ligand and a water mol­ecule complete a distorted octa­hedral 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 mol­ecules and lattice water mol­ecules 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].

(2-Amino-7-methyl-4-oxidopteridine-6-carboxyl­ato-κ³O⁴,N⁵,O⁶)aqua­(ethane-1,2-diamine-κ²N,N′)nickel(II) dihydrate

The Ni^II atom in the title complex, [Ni(C₈H₅N₅O₃)(C₂H₈N₂)(H₂O)]·2H₂O, is six-coordinated in a distorted octa­hedral geometry by a tridentate 2-amino-7-methyl-4-oxidopteridine-6-carboxyl­ate (pterin) ligand, a bidentate ancillary ethane-1,2-diamine (en) ligand and a water mol­ecule. The pterin ligand forms two chelate rings. The en and pterin ligands are arranged nearly orthogonally [dihedral angle between the mean plane of the en mol­ecule and the pterin ring = 77.1 (1)°]. N—H...O, O—H...N and O—H...O hydrogen bonds link the complex mol­ecules and lattice water mol­ecules into a three-dimensional network. π–π inter­actions are observed between the pyrazine and pyrimidine rings [centroid–centroid distance = 3.437 (2) Å].

(2-Amino-7-methyl-4-oxidopteridine-6-carboxyl­ato-κ³O⁴,N⁵,O⁶)(ethane-1,2-diamine-κ²N,N′)(1H-imidazole-κN³)nickel(II) dihydrate

In the title complex, [Ni(C₈H₅N₅O₃)(C₂H₈N₂)(C₃N₂H₄)]·2H₂O, a tridentate 2-amino-7-methyl-4-oxidopteridine-6-carboxyl­ate (pterin) ligand, a bidentate ancillary ethane-1,2-diamine (en) ligand and a monodentate 1H-imidazole (im) ligand complete a distorted octa­hedral geometry around the Ni^II atom. The pterin ligand forms two chelate rings. Both the en and im ligands are arranged nearly orthogonally relative to the pterin ligand [dihedral angles between the mean planes of the en and pterin ligands and of the im and pterin ligands are 84.62 (9) and 85.14 (9)°, respectively]. N—H...N, N—H...O, O—H...N and O—H...O hydrogen bonds link the complex mol­ecules and lattice water mol­ecules into a three-dimensional network.