Chemical elements
    Physical Properties
    Chemical Properties
      Iridium Monochloride
      Iridium Dichloride
      Iridium Trichloride
      Potassium Chloriridite
      Sodium Chloriridite
      Ammonium Chloriridite
      Aquo Chloriridites
      Iridium Tetrachloride
      Potassium Chloriridate
      Sodium Chloriridate
      Ammonium Chloriridate
      Silver Chloriridate
      Thallium Chloriridate
      Iridium Tribromide
      Iridium Tetrabromide
      Potassium Bromiridate
      Sodium Bromiridate
      Ammonium Bromiridate
      Iridium Oxybromide
      Iridium Tri-iodide
      Potassium Iodiridite
      Iridium Tetra-iodide
      Potassium Iodiridate
      Iridium Monoxide
      Iridium Sesquioxide
      Iridium Dioxide
      Iridium Trioxide
      Iridium Monosulphide
      Iridium Sesquisulphide
      Iridium Disulphide
      Iridium Sesquisulphite
      Potassium Iridium Sulphite
      Iridium Sesquisulphate
      Potassium Iridium Alum
      Ammonium Iridium Alum
      Caesium Iridium Alum
      Rubidium Iridium Alum
      Iridium Disulphate
      Iridium Sesquiselenide
      Hydrogen Iridi-nitrite
      Potassium Iridi-nitrite
      Sodium Iridi-nitrite
      Ammonium Iridi-nitrite
      Hydrogen Iridicyanide
      Potassium Iridicyanide
      Barium Iridicyanide
    PDB 1c1k-4enb

Potassium Iridium Sulphite, K3Ir(SO3)3

Potassium Iridium Sulphite, 3K2SO3.Ir2(SO3)3.6H2O, which may be written as K3Ir(SO3)3.3H2O, to show an analogy with the constitutions of the iridi-nitrites and iridi-eyanides described in the sequel. The salt is obtained as a brown, crystalline, insoluble mass on adding potassium carbonate to a solution of iridium sulphite.

Closely resembling the foregoing salt is the ammonium derivative, 3(NH4)2SO3.Ir2(SO3)3.3H2O. The complex chlor-sulphites:

2K2SO3.IrCl.SO3, 3KCl.Ir2SO3.IrCl2.SO3.2H2O, 2K2SO3.KSO3.IrCl2.2KCl.12H2O, and IrCl2.4NH4Cl.H2SO3

have also been prepared.

Sodium yields a sulphite, of formula 3Na2SO3.Ir2(SO3)3.8H2O, obtained in a similar manner to the ammonium and potassium salts. An acid sulphite, 3Na2SO3.H2SO3.IrSO3.Aq., and a neutral sulphite of formula 3Na2SO3.IrSO3.10H2O, have been described. It is difficult to believe, however, that many of the foregoing complexes are definite chemical entities.

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