Catena-Poly[[[tetra-aqua-nickel(II)] - 4,4′-bipyridine-² N:N′] bis-(4-amino-benzensulfonate) dihydrate]

The asymmetric unit of the title compound, {[Ni(C10H8N2)(H2O)4](C6H6NO3S) 2·2H2O} n , consists of one [Ni(4,4′-bipy)(H2O)4]²⁺ cation (4,4′-bipy is 4,4′-bipyridine), two 4-amino-benzensulfonate (4-abs) anions and two solvent water mol-ecules. The Ni²⁺ ions are linked by the 4,4′-bipy units and form a one-dimensional covalent chain, while the 4-abs anions form one-dimensional zigzag supra-molecular chains through hydrogen bonds. These chains are further extended through coordination and solvent water mol-ecules into a three-dimensional supra-molecular network.