Bis(2-pyridinecarboxylato N-oxide-κ2O,O′)nickel(II)

In the title complex, [Ni(C6H4NO3)(2)] or [Ni(L)(2)] (L = 2-pyridinecarboxylic acid N-oxide), the Ni atom occupies a crystallographic inversion center and is coordinated by four O atoms of two ligands L, giving a square-planar geometry. The O atom of the N-oxide is also engaged in a weak interaction with symmetry-related complexes [2.58 (3) angstrom] to form long Ni - O - Ni bridges, which extend parallel to the a axis. The stacking of the square-planar complexes is further stabilized by a slipped pi - pi interaction between the pyridine rings of adjacent molecules with a centroid-to-centroid distance of 3.3900 (7) angstrom and an interplanar distance of 3.099 (2) angstrom, resulting in an offset angle of 24 degrees.