Gallium compounds: digallium hexachloride

gallium symbol icon

The gallium in digallium hexachloride formally is in the oxidation state 3.

Crystal structure of digallium hexachloride

Digallium hexachloride

  • Formula as often written: Ga2Cl6
  • Hill system formula: Cl6Ga2
  • CAS registry number: [13450-90-3]
  • Formula weight: 352.162
  • Class: chloride


  • digallium hexachloride
  • gallium(III) chloride
  • gallium chloride
  • gallium trichloride

Physical properties

  • Colour: white
  • Appearance: crystalline solid
  • Melting point: 78°C
  • Boiling point: 201°C
  • Density: 2470 kg m-3


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Element analysis

Element percentages for the elements in digallium hexachloride
Element %
Cl 60.40
Ga 39.60


2Ga + 6HCl (200°C) → 2GaCl3 + 3H2

Gallium(III) chloride can be made by direct reaction between the elements but hot gallium reacts with hydrogen chloride gas to form gallium(III) chloride in a reaction that does not require the use of chlorine gas. The product sublimes away and the yield is nearly quantitative based upon gallium. The product is a hygroscopic white crystalline solid whose m.p. is 76°C. It sublimes easily under reduced pressures below the melting point.

Solid state structure

  • Geometry of gallium: 4 coordinate: tetrahedral
  • Prototypical structure:

Crystal structure of digallium hexachloride

Isotope pattern

What follows is the calculated isotope pattern for the Ga2Cl6 unit with the most intense ion set to 100%.

Formula: Ga2Cl6

mass  %
348  22.1 ___________
349 0.0
350 71.8 ____________________________________
351 0.0
352 100.0 __________________________________________________
353 0.0
354 78.2 _______________________________________
355 0.0
356 37.6 ___________________
357 0.0
358 11.4 ______
359 0.0
360 2.1 _
361 0.0
362 0.2
363 0.0
364 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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gallium atomic number