Die Quecksilber(II)-Ionen induzierte Hydrolyse gemischter Hexahalogenoosmate(IV)

Mercury(II)-Induced Hydrolysis of Mixed Hexahalo-Osmates(IV) The strong hydrolytic activity of Hg²⁺ ions on complexes OsX_nI_6?n]^2?, X = Cl or Br; n = 1 – 5, is due to electrophilic attack at the I ligands. Small amounts of Hg²⁺ remove only one I. The very stable HgI]⁺ and HgI₂] are formed along with the corresponding pentahalo-monaquo-osmates(IV). In cis-OsCl₄I₂]^2? and fac-OsCl₃I₃]^2? ligands rearrange during hydrolysis giving the thermodynamically favoured I? Os? H₂O axis. Other mono- and bivalent cations have only a slight catalytic effect on the aquation, increasing with the size from Mg²⁺ to Ba²⁺.