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

Silicon Tetra-iodide, SiI4






Silicon Tetra-iodide (Tetra-iodosilicane), SiI4, is obtained by the direct combination of its elements, by leading a stream of iodine vapour, by means of carbon dioxide, over red-hot silicon, which may be either pure or in the crude form (Gattermann). It has also been prepared by-passing iodine vapour heated to 180° C. over silicon heated in a vacuum to 500° C. The vapour of silicon tetra-iodide condenses to the solid state when cooled to atmospheric temperature, and the compound may be crystallised from carbon disulphide, in 1 part of which 2 parts dissolve at 27° C. Silicon tetra-iodide crystallises in regular octahedra, isomorphous with carbon tetra-iodide; it melts at 120.5° C. and boils at 290° C., and its vapour density has been estimated to be 19.12, whilst theory requires 18.56. It burns in the air with a red flame evolving iodine vapour, and is hydrolysed normally by water, whilst with alcohol its reaction is unusual, since it gives no ethyl silicate, but silicic acid, ethyl iodide, and hydriodic acid.


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