Bis(3-amino-pyrazine-2-carboxyl-ato-κ(2) N (1),O)di-aqua-nickel(II) dihydrate

Abstract

In the title compound, [Ni(C5H4N3O2)2(H2O)2]·2H2O, the Ni(II) ion lies on an inversion center and is coordinated in an slightly distorted octa-hedral environment by two N,O-chelating 3-amino-pyrazine-2-carboxyl-ate (APZC) ligands in the equatorial plane and two trans-axial aqua ligands. In the crystal, O-H⋯O, N-H⋯O and O-H⋯N hydrogen bonds involving the solvent water mol-ecules, aqua and APZC ligands form layers parallel to (010). These layers are linked further via O-H⋯O, N-H⋯O and C-H⋯O hydrogen bonds involving the axial aqua ligands, amino groups and the carboxyl-ate groups of the APZC ligands, forming a three-dimensional network.

Fig. 1.

The molecular structure of the title compound. Displacement ellipsoids are drawn at the 50% probability level. H atoms are represented as small spheres of arbitrary radii. Symmetry code: (i)-x+1, -y+1, -z+2.

Fig. 2.

Partial packing plot viewed along the b axis showing the hydrogen bonds (dashed lines) forming layers.

Fig. 3.

Partial packing of (I) showing only the O—H···O hydrogen bonds which connect the layers in Fig. 2 into a three-dimensional network.