Untersuchungen an Polyhalogeniden, XXXVII [1]. Heptaiodide(3-) von Amminkomplexen des Chroms und Cobalts: Hexamminchrom(III)heptaiodid [Cr(NH 3 ) 6 ](I 3 )(I 4 ) und die Tri-μ-hydroxo-bis[metall(III)-triammin]heptaiodide [(NH 3 ) 3 M(OH) 3 M(NH 3 ) 3 ](I 3 ) 2 I mit M = Co, Cr / Studies o f Polyhalides, XXXVII [1]. Heptaiodides(3-) of Ammine Complexes of Chromium and Cobalt: Hexamminechromium(III) heptaiodide [Cr(NH 3 ) 6 ](I 3 )(I 4 ) and the Tri-μ-hydroxo-bis[metal(III)-triammine] heptaiodides

• Published in: Zeitschrift für Naturforschung. B, A journal of chemical sciences Vol. 53; no. 10; pp. 1127 - 1134
• Main Authors: Tebbe, Karl-Friedrich, Gilles, Theo
• Format: Journal Article
• Language: English
• Published: 01.10.1998
• ISSN: 0932-0776; 1865-7117
• DOI: 10.1515/znb-1998-1008

Abstract The new compounds [Cr(NH 3 ) 6 ](I 3 )(I 4 ) and [(NH 3 ) 3 M(OH) 3 M(NH 3 ) 3 ](I 3 ) 2 I with M = Cr, Co have been prepared by the reaction of [M(NH 3 ) 6 ]X 3 (M = Cr, Co; X = Cl, I, NO 3 ), KI, and I 2 in water under controlled stoichiometric and pH conditions. The first compound is isotypic with the cobalt compound of the same composition. It crystallizes in the monoclinic space group I 2 /m with a = 984.7(3), b = 786.6(1), c = 1330.1(3) pm, β = 95.34(2)° and Z = 2 and contains nearly octahedral cations [Cr(NH 3 ) 6 ] 3+ , a linear triiodide ion I 3 - and a tetraiodide ion I 42- . The two other compounds are isotypic. They crystallize in the orthorhombic space group Pnma with a = 2629.6( 14) / 2633.5(2), b = 798.3(11) / 797.3(1), c = 1127.6(7) / 1125.7( 1) pm and Z = 4 for Co / Cr respectively. The heptaiodide(3-) ion is broken into two triiodide ions and one iodide ion