Barium compounds: barium diiodide

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The barium in barium diiodide formally is in the oxidation state 2.

Crystal structure of barium diiodide

Barium diiodide

  • Formula as often written: BaI2
  • Hill system formula: Ba1I2
  • CAS registry number: [13718-50-8]
  • Formula weight: 391.136
  • Class: iodide

Synonyms

  • barium diiodide
  • barium(II) iodide
  • barium iodide

Physical properties

  • Colour: white
  • Appearance: crystalline solid
  • Melting point: 711°C
  • Boiling point: 2027
  • Density: 5150 kg m-3

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Element analysis

Element percentages for the elements in barium diiodide
Element %
Ba 35.11
I 64.89

Synthesis

Barium iodide is made by the neutralization of barium carbonate with HI in water. The product crystallizes as the hydrate BaI2.2H2O [7787-33-9]. If this heated, dehydration to anhydrous BaI2 occurs.

BaCO3 + 2HI(aq) → BaI2(aq)

It is also made by the reaction of BaH2 with ammonium iodide in pyridine.

BaH2 + 2NH4I(aq) → BaI2(aq) + 2NH3(g) + H2(g)

Solid state structure

  • Geometry of barium:
  • Prototypical structure: PbCl2

Crystal structure of barium diiodide

Isotope pattern

What follows is the calculated isotope pattern for the BaI2 unit with the most intense ion set to 100%.

Formula: Ba1I2

mass  %
384   0.2 
385 0.0
386 0.1
387 0.0
388 3.4 __
389 9.2 _____
390 10.9 _____
391 15.7 ________
392 100.0 __________________________________________________

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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barium atomic number