Crystal structure of catena-poly[[[tri­aqua­(4-cyano­benzoato-κO)nickel(II)]-μ-4,4′-bi­pyridine-κ(2) N:N′] 4-cyano­benzoate]

In the title polymeric complex salt, {[Ni(C(8)H(4)NO(2))(C(10)H(8)N(2))(H(2)O)(3)](C(8)H(4)NO(2))}(n), the Ni(II) cation is coordinated by a 4-cyano­benzoate anion, two 4,4′-bi­pyridine ligands and three water mol­ecules in a distorted N(2)O(4) octa­hedral geometry. The 4,4′-bi­pyridine ligands bridge the Ni(II) cations to form polymeric chains of the title complex cations, propagating along the c-axis direction. The dihedral angle between the pyridine rings of the 4,4′-bi­pyridine ligand is 24.9 (6)°. In the crystal, the uncoordinating 4-cyano­benzoate anions link with the complex cations via O—H⋯O hydrogen bonds into a three-dimensional supra­molecular architecture. Weak C—H⋯O, C—H⋯N inter­actions and π–π stacking [centroid-to-centroid distances = 3.566 (4) and 3.885 (4) Å] are also observed in the crystal.