Bestimmung der Stabilitätskonstanten gemischter Hexahalogenokomplexe von Osmium(IV)

Determination of the Stability Constants of Mixed Hexahalogeno Complexes of Osmium(IV) The individual and total stability constants of the complex series OsX_xY_6?x]^2?; X ≠ Y = Cl, Br, I; x = 0–6 are determined by radiometric measurements of the equilibrium concentrations of all compounds. The thermodynamical stability increases from the hexabromo- over the hexachloro- to the hexaiodo-complex. The total stability constants are in ratio of 1:5,2:1225. With the individual constants the equilibrium diagrams are calculated. The photometric determination of the cis/trans ratio in complexes with x = 2, 3, 4 gives the statistical distribution of the ligands in the octahedrons. The relationship between thermodynamical and kinetical data is discussed.