catena-Poly[[(2,2′-bipyridine-κ2N,N′)nickel(II)]-μ-oxalato-κ4O1,O2:O1′,O2′]

The title compound, [Ni(C2O4)(C10H8N2)]n, is isostructural with its MnII, FeII, CuII and ZnII analogues. Each NiII atom is chelated by two oxalate ligands and one 2,2′-bipyridine, forming a slightly distorted octahedral geometry. Oxlate acts as a bridge to link neighbouring pairs of NiII cations, forming a one-dimensional wave-like chain. The crystal showed partial inversion twinning.