Tetraiodide von Tris(1,2-ethandiamin)komplexen der Metalle Zink und Nickel

The isotypic compounds tris(1,2-ethanediamine-N,N')zinc(II) triiodide iodide, [Zn(C(2)H(8)N(2))(3)](I(3))I, and tris(1, 2-ethanediamine-N,N')nickel(II) triiodide iodide, [Ni(C(2)H(8)N(2))(3)](I(3))I, contain the octahedral [M(en)(3)](2+) cation, with M = Zn and Ni, in both enantiomeric forms, an essentially linear triiodide anion and an iodide anion. The geometries of the complex ions are as expected, e.g. d(Ni-N) = 2.123 (5), 2.127 (6) and 2.134 (5) A, and d(Zn-N) = 2.176 (4), 2.193 (4) and 2.210 (4) A. The shortest contact between the triiodide and iodide ions is 3.979 (1) A for the nickel compound and 4.013 (1) A for the zinc compound.