Osmium compounds: osmium triiodide

osmium symbol icon

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

Osmium triiodide

  • Formula as often written: OsI3
  • Hill system formula: I3Os1
  • CAS registry number: [59201-58-0]
  • Formula weight: 570.943
  • Class: iodide


  • osmium triiodide
  • osmium(III) iodide
  • osmium iodide

Physical properties

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


Coming soon...

Element analysis

Element percentages for the elements in osmium triiodide
Element %
I 66.68
Os 33.32


Not available

Isotope pattern

What follows is the calculated isotope pattern for the OsI3 unit with the most intense ion set to 100%.

Formula: Os1I3

mass  %
565   0.0 
566 0.0
567 3.9 __
568 3.9 __
569 32.4 ________________
570 39.3 ____________________
571 64.4 ________________________________
572 0.0
573 100.0 __________________________________________________


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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osmium atomic number