Untersuchungen an Polyhalogeniden, XXXIII [1] Polyiodide des Nickelhexamminkomplexes: Nickelhexamminbistriiodid [Ni(NH3)6](I3) 2 und Nickelhexamminbispentaiodid [Ni(NH3)6](I5)2 / Studies of Polyhalides, 33 [11 Polyiodides of the Nickel Hexammine Complex: Nickelhexammine Bistriiodide [Ni(NH3)6](I3) 2 and Nickelhexammine Bispentaiodide [Ni(NH3)6](I5)2

Abstract

The compounds [Ni(NH3)6](I3)2 and [Ni(NH3)6](I5)2 have been prepared by the reaction of stoichiometric amounts of [Ni(NH3)6]Cl2, KI, and I2 in water. The already known triiodide crystallizes in the monoclinic space group C2/c with a = 1541,0( 10), b = 1521.6(8), c = 876.1 (7) pm, β = 101.44(6)° and Z = 4. The new pentaiodide crystallizes in the monoclinic space group P21/n with a = 899.6(4), b = 1681.6(5), c = 946.8(7) pm, β = 110.90(5)° and Z = 2. Both compounds contain nearly octahedral cations [Ni(NH3)6]2+ and simultaneously a linear and a bent triiodide ion I3 - with nearly equal bond lengths or a unsymmetrical V-shaped pentaiodide ion I5 - which is lined up to a new type of pentaiodide chain.