Tungsten compounds: tungsten triiodide

tungsten symbol icon

The tungsten in tungsten triiodide formally is in the oxidation state 3.

Tungsten triiodide

  • Formula as often written: WI3
  • Hill system formula: I3W1
  • CAS registry number: [15513-69-6]
  • Formula weight: 564.553
  • Class: iodide


  • tungsten triiodide
  • tungsten(III) iodide
  • tungsten iodide

Physical properties

  • Colour:
  • Appearance:
  • Melting point:
  • Boiling point:
  • Density:


Coming soon...

Element analysis

Element percentages for the elements in tungsten triiodide
Element %
I 67.44
W 32.56


2W(CO)6 + 3I2 → 2WI3 + 12CO(g)

Isotope pattern

What follows is the calculated isotope pattern for the WI3 unit with the most intense ion set to 100%.

Formula: W1I3

mass  %
561   0.4 
562 0.0
563 85.8 ___________________________________________
564 46.6 _______________________
565 100.0 __________________________________________________
566 0.0
567 93.2 _______________________________________________


The data on these compounds pages are assembled and adapted from the primary literature and several other sources including the following.

  • R.T. Sanderson in Chemical Periodicity, Reinhold, New York, USA, 1960.
  • N.N. Greenwood and A. Earnshaw in Chemistry of the Elements, 2nd edition, Butterworth, UK, 1997.
  • F.A. Cotton, G. Wilkinson, C.A. Murillo, and M. Bochmann, in Advanced Inorganic Chemistry, John Wiley & Sons, 1999.
  • A.F. Trotman-Dickenson, (ed.) in Comprehensive Inorganic Chemistry, Pergamon, Oxford, UK, 1973.
  • R.W.G. Wyckoff, in Crystal Structures, volume 1, Interscience, John Wiley & Sons, 1963.
  • A.R.West in Basic solid state chemistry Chemistry, John Wiley & Sons, 1999.
  • A.F. Wells in Structural inorganic chemistry, 4th edition, Oxford, UK, 1975.
  • J.D.H. Donnay, (ed.) in Crystal data determinative tables, ACA monograph number 5, American Crystallographic Association, USA, 1963.
  • D.R. Lide, (ed.) in Chemical Rubber Company handbook of chemistry and physics, CRC Press, Boca Raton, Florida, USA, 77th edition, 1996.
  • J.W. Mellor in A comprehensive treatise on inorganic and theoretical chemistry, volumes 1-16, Longmans, London, UK, 1922-1937.
  • J.E. Macintyre (ed.) in Dictionary of inorganic compounds, volumes 1-3, Chapman & Hall, London, UK, 1992.

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tungsten atomic number