Acta Cryst. (2013). E69, m99-m100
[ doi:10.1107/S160053681300069X ]

(2-Amino-7-methyl-4-oxidopteridine-6-carboxylato-³O⁴,N⁵,O⁶)aqua(ethane-1,2-diamine-²N,N')nickel(II) dihydrate

S. S. Baisya and P. S. Roy

Abstract: 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-HO, O-HN and O-HO hydrogen bonds link the complex molecules and lattice water molecules into a three-dimensional network. - interactions are observed between the pyrazine and pyrimidine rings [centroid-centroid distance = 3.437 (2) Å].

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