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

Iridium Disulphide, IrS2

Iridium Disulphide, IrS2, has been prepared in a variety of ways, chief among which are:
  1. Heating ammonium chloriridate with sulphur.
  2. Acting on finely divided iridium with an alkali polysulphide.
  3. Passing hydrogen sulphide over lithium chloriridite at 4.7° C. No action takes place below 0° C., whilst above 10° C. the salt is rapidly attacked, free sulphur separating. The product is repeatedly extracted with absolute alcohol and dried at 90-100° C. in carbon dioxide.

Iridium disulphide is a brown powder. Moist air has no action on it. Heated to 300° C. in air, sulphur is expelled, metallic iridium remaining behind. Hydrochloric and nitric acids do not affect it although fuming nitric acid and aqua regia effect its decomposition. It is reduced to a lower sulphide at red heat in a current of carbon dioxide.

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