Crystal structure of poly[[trans-di­aqua­bis­[μ₂-trans-4,4′-(diazenedi­yl)dipyridine]­nickel(II)] diiodide ethanol disolvate]

In the title compound, {[Ni(C₁₀H₈N₄)₂(H₂O)₂]I₂·2C₂H₅OH}_n, the complex shows an octa­hedral environment of the Ni²⁺ cation in which it is located on a centre of symmetry, linked to two water mol­ecules and the pyridine-N atoms of four 4,4′-(diazenediyl)dipyridine ligands bridging Ni²⁺ cations along the b- and c-axis directions, giving rise to a two-dimensional arrangement. The Ni—N bond lengths are in the range 2.109 (4)–2.186 (3) Å and the Ni—O bond length is 2.080 (3) Å. The 4,4′-(diazenedi­yl)dipyridine ligand lies on an inversion centre. An O—H...O hydrogen-bond inter­action is observed between water and ethanol mol­ecules. The I⁻ ions can be regarded as free anions in the crystal lattice.