Chemical elements
    Physical Properties
    Chemical Properties
      Antimony Trihydride
      Antimony Trifluoride
      Antimony Pentafluoride
      Antimony Trichloride
      Oxychlorides of Tervalent Antimony
      Antimony Tetrachloride
      Antimony Pentachloride
      Chloroantimonic Acids
      Antimonyl Perchlorate
      Antimony Tribromide
      Antimony Oxybromides
      Antimony Pentabromide
      Antimony Triiodide
      Antimony Oxyiodide or Antimonyl Iodide
      Antimony Thioiodide
      Mixed Antimony Halides
      Antimony Trioxide
      Hydrated Antimony Trioxide
      Antimony Tetroxide or Antimony Dioxide
      Antimony Pentoxide
      Antimony Trisulphide
      Antimony Pentasulphide
      Normal Antimony Sulphate
      Potassium Stibiothiosulphate
      Antimony Selenate
      Antimony tritelluride
      Antimony Phosphide
      Antimonyl Dihydrogen Phosphite
      Antimony Phosphate
      Antimony Pyrophosphate
      Antimony Thiophosphate
    PDB 1exi-2xqa

Antimony Tetrachloride, SbCl4

Antimony Tetrachloride, SbCl4 does not yet appear to have been isolated, but many double compounds formed from it have been obtained, including 2CsCl.SbCl4, 2RbCl.SbCl4, TlCl.SbCl4 and possibly 3KCl.2SbCl4. Many other compounds contain both tervalent and quadrivalent antimony; while still more are known only in the form of isomorphous mixtures with corresponding compounds such as platinum tetrachloride and tin tetrachloride. All these compounds are dark brown or deep violet in colour, a darkening of colour being an indication of the presence of quadrivalent antimony. All these double compounds, with the exception of one containing both thallic and thallous chlorides, with the probable formula TlCl.TlCl3.2SbCl4, tend to decompose into mixtures of compounds containing tervalent and quinquevalent antimony. The equilibrium, in solution,

SbCl3 + SbCl5 ⇔ 2SbCl4

appears to be greatly dependent upon the temperature and the possibility of ionisation. The presence of sulphuric acid and of salts favours the formation of antimony tetrachloride, and the mixture becomes darker, indicating an increasing proportion of the tetrachloride, upon addition of hydrochloric acid, or with stronger heating.

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