Chemical elements
  Silicon
    Isotopes
    Energy
    Physical Properties
    Chemical Properties
      Silicon Tetrahydride
      Silicomethane
      Silicane
      Silico-ethane
      Silico-acetylene
      Bromosilicane
      Silicofluoroform
      Trifluorosilicane
      Silicochloroform
      Trichlorosilicane
      Silicobromoform
      Tribromosilicane
      Silico-iodoform
      Tri-iodosilicane
      Silicon Tetrafluoride
      Hydrofluosilicic Acid
      Silicon Subfluoride
      Silicon Tetrachloride
      Tetrachlorosilicane
      Silicon Tetrabromide
      Tetrabromosilicane
      Silicon Tetra-iodide
      Tetra-iodosilicane
      Mixed Halides of Silicon
      Halogen Derivatives of Silico-ethane
      Halogen Derivatives of Silicopropane
      Halogen Derivatives of Silicobutane
      Halogen Derivatives of Silicopentane and Silicohexane
      Silicon Oxychlorides
      Silica
      Silicon Dioxide
      Silicates
      Silicoformic Anhydride
      Silico-oxalic Acid
      Silicomes-oxalic Acid
      Silicon Disulphide
      Silicon Monosulphide
      Silicon Oxysulphide
      Silicon Thiochloride
      Silicon Thiobromide
      Silicon Chloroitydrosulphide
      Silicothio-urea
      Silicon Selenide
      Silicon Tetramide
      Silicon Di-imide
      Silicon Nitrimide
      Silicam
      Siliconitrogen Hydride
      Silicon Nitrides
      Crystalline Silicon Monocarbide
      Carborundum
      Silicon Dicarbide
      Silicon Carboxide
      Borides of Silicon
    PDB 1fuq-4ehr

Silico-iodoform, SiHI3






Silico-iodoform was prepared by Buff and Wohler by the action of hydrogen iodide gas on heated silicon, and the method was improved upon by Friedel, who mixed hydrogen with the hydrogen iodide. Ruff has found that when silicochloroform reacts with ammonia at -15° C. siliconitrogen hydride, SiHN, is formed; and when this is suspended in carbon disulphide and treated with hydrogen iodide at low temperature, silico-iodoform is produced according to the reaction:

SiHN + 4HI = SiHI3 + NH4I.

The ammonium iodide is filtered off and the silico-iodoform freed from the solvent, carbon disulphide, and from silicon tetra-iodide by distillation. An even better result is obtained by employing aniline instead of ammonia. Silicon hydrotrianilide is formed, which reacts with hydrogen iodide thus:

SiH(NHC6H5)3 + 6HI = SiHI3 + 3C6H5NH2.HI.

Silico-iodoform is a colourless liquid having a density of 3.286 at 23° C. or 3.314 at 20° C. and 3.362 at 0° C., which solidifies at +8° C. and distils under reduced pressure as follows:

Pressure mm.Temperature ° C.
14106
22111
67132
122155


At about 150° C. it begins to decompose, but on further heating some of it can be distilled, and condensed at about 220° C. under atmospheric pressure. Silico-iodoform vapour burns in the air, and the liquid is decomposed by water like the chlorine compound, yielding silicoformic anhydride and hydriodic acid.


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