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Chemical elements
  Selenium
    Isotopes
    Energy
    Production
    Application
    Allotropy
    Colloidal
    Physical Properties
    Chemical Properties
      Hydrogen Selenide
      Selenium Fluorides
      Selenium Monochloride
      Selenium Tetrachloride
      Selenium Monobromide
      Selenium Tetrabromide
      Selenium Chlorobromides
      Selenium Oxyfluoride
      Selenium Oxychloride
      Sulphur Selenium Oxytetrachloride
      Selenium Oxybromide
      Chloroselenic Acid
      Selenium Dioxide
      Selenious Acid
      Selenium Trioxide
      Selenic Acid
      Selenates
      Perselenic Acid
      Selenium Sulphoxide
      Selenotrithionic Acid
      Diselenotrithionic Acid
      Selenopentathionic Acid
      Selenium Nitride
      Nitrosylselenic Acid
      Phosphorus Subselenide
      Phosphorus Monoselenide
      Tetraphosphorus Triselenide
      Phosphorus Triselenide
      Phosphorus Pentaselenide
      Phosphorus Chloroselenide
      Selenophosphates and Oxyselenophosphates
      Carbon Diselenide
      Carbon Subselenides
      Carbon Oxyselenide
      Carbon Sulphidoselenide
      Cyanogen Monoselenide
      Cyanogen Diselenide or Selenocyanogen
      Cyanogen Triselenide
      Selenocyanic Acid
      Ammonium Selenocyanate
      Caesium Triselenocyanate
      Copper Selenocyanate
      Lead Selenocyanate
      Magnesium Selenocyanate
      Mercurous Selenocyanate
      Mercuric Selenocyanate
      Potassium Selenocyanate
      Silver Selenocyanate
      Sodium Selenocyanate
      Zinc Selenocyanate
      Silicon Selenide
    Detection and Estimation

Carbon Subselenides

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Carbon Subselenides of compositions C₄Se and C₅Se₂ have been described. When amorphous red selenium is distilled with carbon tetrabromide, in the molecular proportions 2:1, the greyish-black residue obtained after treatment with carbon disulphide, phenol, alcohol and ether in succession, has the composition C₉Br₂Se₄. This substance when heated with a very concentrated solution of sodium hydroxide forms the selenide C₄Se, a compound which dissolves with difficulty in concentrated sulphuric acid to give a light brown solution. If the sodium hydroxide solution of the bromoselenide is treated with hydrochloric acid, a violet-brown precipitate of the compound C₅Se₂ is obtained, which readily dissolves in hot concentrated sulphuric acid to give a reddish- brown solution.

The phenol extract of the residue from the foregoing distillation, on boiling with aqueous alcohol gives a brown, flocculent precipitate, of composition C₁₀BrSe₅, and this when boiled with concentrated sodium hydroxide also yields the selenide C₅Se₂.

Other bromoselenides obtained by the interaction of selenium and carbon tetrabromide are stated to have the following compositions: C₃BrSe₃.3H₂O, red crystals with a metallic lustre, m.pt. 120° C.; C₃Br₂Se₂, orange-coloured solid, m.pt. 210° to 212° C.; C₂Br₂Se₄, brownish-red leaflets, m.pt. 154° C.