catena-Poly[diaquabis(nicotinamide-N¹)copper(II)-μ-sulfato-O:O']

The sulfate anion acts as a bridging ligand between the copper(II) ions in the linear polymeric chain of the title compound, [Cu(SO₄)(C₆H₆N₂O)₂(H₂O)₂]_n. Distorted octahedral coordination about copper(II) is achieved by two ring N atoms of the nicotinamide groups, in cis conformation [Cu-N 2.016 (3) and 2.018 (3) Å], by two water molecules [Cu-OW 1.986 (3) and 1.989 (3) Å], and by two O atoms of two sulfate moieties [Cu-O 2.418 (3) and 2.421 (3) Å].