Tris(ethyl­enediamine)nickel(II) tetra­iodo­cadmate(II)

The title compound, [Ni(C6H24N6)][CdI4], contains two discrete ions, an [Ni(en)3]2+ (en = ethyl­enediamine) cation and a [CdI4]2− anion. The Ni2+ ion is coordinated by three chelating ethyl­enediamine ligands in a distorted octa­hedral geometry while the Cd2+ ion binds four iodide ions in a slightly distorted tetra­hedron. Both the Ni and Cd atoms lie on threefold axes of rotation. The structure is disordered at cadmium, with two alternative sites for the metal in a 97:3 ratio; the minor component of the disorder inverts the CdI4 tetra­hedron and reverses the direction of propagation of the aligned [CdI4]n2− units.