Abstract
Abstract The new compounds [Cr(NH3)6](I3)(I4) and [(NH3)3M(OH)3M(NH3)3](I3)2I with M = Cr, Co have been prepared by the reaction of [M(NH3)6]X3 (M = Cr, Co; X = Cl, I, NO3), KI, and I2 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 I2/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(NH3)6]3+, a linear triiodide ion I3 - and a tetraiodide ion I42-. 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
Published Version
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