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-ethane, Si2H6






Silico-ethane, Si2H6, was discovered by Moissan and Smiles among the products of the action of hydrochloric acid on magnesium silicide, formed by heating magnesium and silicon together in the proportion 2Mg:Si. The gas obtained consists of a mixture of hydrogen, silicane, and silico-ethane. The two latter gases were separated from the hydrogen by solidification in tubes surrounded by liquid air; the silicane was removed from the tubes by fractional vaporisation, leaving the silico-ethane behind.

Silico-ethane may also be prepared from lithium silicide, which has the corresponding composition, Si2Li6, by decomposing it with concentrated hydrochloric acid.

Silico-ethane is a mobile, colourless liquid, heavier than, and sparingly soluble in, water. It boils at 52° C. or, according to Lebeau, at -7° C., and after solidification by means of liquid air, melts at - 138° C. Its vapour may be heated to 100° C. without decomposition, at which temperature the density is found to be 2.37 (air = 1), whilst silico-ethane requires 2.41. It is decomposed into its elements at 240° C., and electric sparks decompose it, separating amorphous silicon.

Silico-ethane takes fire spontaneously and even explosively in the air, burning to silica and water; drying with sulphuric acid increases the vigour of the reaction; it precipitates the metals from aqueous solutions of mercuric chloride, auric chloride, and silver nitrate; potassium dichromate and permanganate solutions, as well as bromine water, oxidise it to silicic acid. Carbon tetrachloride and sulphur hexafluoride react explosively with silico-ethane, with formation of the halogen hydracids and separation of the solid elements. Silico-ethane reacts with caustic potash solution similarly to silicane; in this way one molecule produces seven molecules of hydrogen:

Si2H6 + 2H2O + 4KOH = 2K2SiO3 + 7H2,

and the volume of hydrogen evolved serves to estimate the substance.

It appears from these reactions that silico-ethane resembles silicane in chemical properties, and differs entirely from ethane. There is no reason to suppose it differs from this hydrocarbon in constitution, but there are two reasons why it has different properties. For not only does it easily lose hydrogen, a property it shares with silicane, but the two silicon atoms permit of oxygen intervening between them in the process of oxidation.


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