Barium diiodide

Barium compounds: barium diiodide

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

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

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	Baryum
Barium	Barium
Bario	Bario
Barium	Bário