Aluminium compounds: dialuminium hexabromide

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The aluminium in dialuminium hexabromide formally is in the oxidation state 3.

Crystal structure of dialuminium hexabromide

Dialuminium hexabromide

  • Formula as often written: [AlBr3]2
  • Hill system formula: Al2Br6
  • CAS registry number: [7727-15-3]
  • Formula weight: 533.387
  • Class: bromide

Synonyms

  • dialuminium hexabromide
  • aluminium(III) bromide
  • aluminium bromide
  • aluminium tribromide
  • aluminum bromide
  • aluminum tribromide
  • aluminum(III) bromide
  • dialuminum hexabromide

Physical properties

  • Colour: white or very pale yellow
  • Appearance: crystalline solid
  • Melting point: 97.5°C
  • Boiling point: 255°C
  • Density: 3200 kg m-3

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Element analysis

Element percentages for the elements in dialuminium hexabromide
Element %
Al 10.12
Br 89.88

Synthesis

2Al + 3Br2 → Al2Br6

Solid state structure

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

Crystal structure of dialuminium hexabromide

Isotope pattern

What follows is the calculated isotope pattern for the [AlBr3]2 unit with the most intense ion set to 100%.

Formula: Al2Br6

mass  %
528   5.4 ___
529 0.0
530 31.7 ________________
531 0.0
532 77.1 _______________________________________
533 0.0
534 100.0 __________________________________________________
535 0.0
536 73.0 ____________________________________
537 0.0
538 28.4 ______________
539 0.0
540 4.6 __

References

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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