catena-Poly[[diaqua­nickel(II)]-bis­(μ-pyridine-4-sulfinato)-κ(2) N,O;κ(2) O,N]

In the title coordination polymer, [Ni(C(5)H(4)NO(2)S)(2)(H(2)O)(2)](n), the Ni(II) ion is located on an inversion centre and is octa­hedrally coordinated by two N and two O atoms of four symmetry-related and deprotonated pyridine-4-sulfinate (ps) ligands together with two water mol­ecules in axial positions. The ps(−) anions, acting as μ(2)-bridging ligands, link neighbouring Ni(II) ions into a chain structure along the c axis. These polymeric chains are extended into a three-dimensional framework via inter­molecular O—H⋯O hydrogen bonds with participation of the water mol­ecules.