Chemical elements
  Iridium
    Isotopes
    Energy
    Production
    Application
    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

Iridium Tribromide, IrBr3






Iridium Tribromide, IrBr3.4H2O, may be obtained by dissolving the hydrated dioxide, IrO2.2H2O, in hydrobromic acid, and evaporating to dryness to decompose the tetrabromide thus formed. Extraction with water and subsequent crystallisation yields olive-green prisms, very soluble in water, but insoluble in alcohol.

At 105-120° C. the water of crystallisation is removed.

An Acid Iridium Tribromide, IrBr3.3HBr.3H2O, is obtained as small, deliquescent, steely blue crystals on working the mother-liquor from the previous salt for a further crop of crystals. It decomposes at 120° C.

Like the trichloride, iridium tribromide unites with bromides of the alkali metals to form hromiridites, the most important of which are:

Potassium Bromiridite, K3IrBr6.3H2O, long, olive-green needles; Sodium Bromiridite, Na3IrBr6.12H2O, brownish green rhombohedra; Ammonium Bromiridite, [(NH4)3IrBr6]2H2O, small olive-green crystals.


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