Poly[aqua­bis(μ-pyrazine-2-carboxyl­ato)nickel(II)]

The asymmetric unit of the title compound, [Ni(C5H3N2O2)2(H2O)]n, contains two bidendate pyrazine-2-carboxyl­ate anions bonded to NiII in the equatorial plane through one N and one O atom. The NiII atoms are linked into chains by the second N atom of one of the pyrazine-2-carboxyl­ate anions bonding to an axial site of a neighbouring NiII atom. The slightly distorted octa­hedral coordination around NiII is completed by a water mol­ecule, which forms hydrogen bonds linking the chains into a three-dimensional structure.