Chemical elements
  Bismuth
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
      Bismuth Trihydride
      Bismuth Trifluoride
      Bismuthyl Fluoride
      Bismuth Trichloride
      Bismuth Oxychloride
      Bismuth Chlorate
      Bismuthyl Perchlorates
      Bismuth Thiochloride
      Bismuth Selenochloride
      Bismuth Dibromide
      Bismuth Tribromide
      Bismuth Oxybromide
      Bismuth Thiobromide
      Bismuth Diiodide
      Bismuth Triiodide
      Bismuth Oxyiodide
      Bismuth Iodate
      Bismuth Thioiodide
      Bismuth Monoxide
      Bismuth Trioxide
      Bismuth Hydroxide
      Bismuth Tetroxide
      Bismuth Pentoxide
      Bismuth Hexoxide
      Bismuth Monosulphide
      Bismuth Trisulphide
      Bismuth Sulphites
      Bismuth Sulphate
      Bismuth Thiosulphates
      Bismuth Triselenide
      Bismuth Chromite
      Bismuth Nitride
      Bismuthyl Nitrite
      Normal Bismuth Nitrate
      Basic Bismuth Nitrate
      Bismuth Phosphide
      Bismuth Hypophosphite
      Bismuth Phosphite
      Bismuth Orthophosphate
      Bismuth Pyrophosphate
      Bismuth Thiophosphate
      Bismuth Arsenide
      Bismuth Arsenite
      Bismuth Arsenate
      Bismuth Carbonate
      Bismuth Cyanides
      Bismuth Thiocyanate
      Bismuth Chromothiocyanate
      Bismuth Orthosilicate
    Detection and Estimation

Bismuth Oxyiodide, BiOI






Bismuth Oxyiodide, or Bismuthyl Iodide, BiOI, is most readily obtained by the hydrolysis of bismuth triiodide. Various other methods for its preparation have been described, including the oxidation of bismuth triiodide, the action of heat upon a mixture of bismuth triiodide and bismuth trioxide, or the direct combination of those compounds in a solution of potassium iodide at the ordinary temperature, and the distillation of methyl iodide through bismuth trioxide.

It is a red, crystalline powder; the crystals are variously described as brick-red, cubic microcrystals, or as copper-red, rhombic leaflets. The density at 15° C. is 7.922.

The oxyiodide is stable in air, melting at red heat without decomposition. When heated in the absence of air it sublimes with partial decomposition, and when more strongly heated it is converted to bismuth trioxide. It is only slightly attacked by water, but readily by dilute mineral acids with the formation of bismuth triiodide. It dissolves in concentrated hydrochloric acid, forming a yellow solution. It is decomposed by both concentrated sulphuric acid and concentrated nitric acid with evolution of iodine. It is not attacked to any appreciable extent by dilute alkaline solutions, even on warming; but it is converted to trioxide by the action of a concentrated solution of potassium hydroxide. It is not attacked by a solution of potassium chloride. It is completely converted into trisulphide by the action of a mixture of potassium hydroxide and ammonium sulphide.

Various other oxyiodides have been reported from time to time, but their existence has not been confirmed.


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