Diaqua­bis­{4-[(pyridin-2-yl)methyl­idene­amino]­benzene­sulfonato-κ(2) N,N′}nickel(II) tetra­hydrate

In the title complex, [Ni(C(12)H(9)N(2)O(3)S)(2)(H(2)O)(2)]·4H(2)O, the Ni(II) ion is coordinated by four N atoms from two bidentate chelating 4-[(pyridin-2-yl)methyl­idene­amino]­benzene­sulfonate ligands and two O atoms from cis-related water mol­ecules in a slightly distorted octa­hedral environment [Ni—N = 2.071 (3)–2.121 (3) Å and Ni—O = 2.071 (2) and 2.073 (3) Å]. In the crystal, the coordinated water mol­ecules and the four water mol­ecules of solvation are involved in inter­molecular O—H⋯O hydrogen-bonding inter­actions with water and sulfon­ate O-atom acceptors, giving a three-dimensional framework structure.