Iron compounds: iron dichloride

iron symbol icon

The iron in iron dichloride formally is in the oxidation state 2.

Crystal structure of iron dichloride

Iron dichloride

  • Formula as often written: FeCl2
  • Hill system formula: Cl2Fe1
  • CAS registry number: [7758-94-3]
  • Formula weight: 126.75
  • Class: chloride


  • iron dichloride
  • iron(II) chloride
  • iron chloride

Physical properties

  • Colour: pale yellow to white
  • Appearance: crystalline solid
  • Melting point: 674°C
  • Boiling point: 1023°C; 1012°C
  • Density: 3160 kg m-3


Coming soon...

Element analysis

Element percentages for the elements in iron dichloride
Element %
Cl 55.94
Fe 44.06


Not available

Solid state structure

  • Geometry of iron:
  • Prototypical structure:

Crystal structure of iron dichloride

Isotope pattern

What follows is the calculated isotope pattern for the FeCl2 unit with the most intense ion set to 100%.

Formula: Fe1Cl2

mass  %
124   6.1 ___
125 0.0
126 100.0 __________________________________________________
127 2.3 _
128 62.4 _______________________________
129 1.5 _
130 10.0 _____
131 0.2
132 0.0


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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iron atomic number