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

Silicochloroform, SiHCl3






Silicochloroform, SiHCl3, so named because of its analogy with chloroform, was obtained impure by Buff and Wohler in 1857 by heating silicon in a current of dry hydrogen chloride gas, and was examined later by Friedel and Laden- burg.2 Gattermann 3 showed that it could be obtained in the same way from the crude silicon formed by heating silica with magnesium; it must, hoWever, be freed from the tetrachloride formed at the same time by fractional distillation, and then be 'condensed in a freezing mixture. Ferrosilicon and copper silicide may be employed in place of silicon itself.

Silicochloroform is a colourless, mobile, strongly smelling liquid which boils at 33° C. under 758 mm. pressure and forms a crystalline solid which melts at -134° C. The density of the liquid at 15° C. is 1.3438, and its vapour density 4.64, which corresponds with theory. It may be observed that chloroform, CHCl3, boils at 61.5° C. It will be noticed in the course of what follows that, apart from polymerisation, silicon compounds are generally more volatile than the corresponding carbon compounds.

When silicochloroform is heated in an indifferent atmosphere it decomposes similarly to silicofluoroform, thus:

4SiHCl3 = 3SiCl4 + 2H2 + Si;

its vapour burns in the air with a green-mantled flame, like that of chloroform, producing clouds of silica, and forms with air a mixture which can be exploded by means of a hot glass rod. Unlike chloroform and carbon tetrachloride, but like silicon tetrachloride, silicochloroform fumes in moist air, and is decomposed by water, with evolution of heat, forming silicic and hydrochloric acids. If, however, the reaction takes place at 0° C. the hydrogen is retained, and silicoformic anhydride is produced as a white, insoluble powder:

2SiHCl3 + 3H2O = + 6HCl.

Alcohol reacts normally, producing ethyl orthosilicoformate: SiHCl3 + 3C2H5OH = SiH(OC2H5)3 + 3HCl,

and not ethyl orthosilicate, as with silicofluoroform.


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