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

Abstract

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 theb- andc-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.