Strontium bromide

Strontium bromide

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Names
IUPAC name Strontium bromide
Identifiers
CAS Number	10476-81-ce N
ChemSpider	23635 Y
EC Number	233-969-5
Jmol 3D model	Interactive image
PubChem	25302
InChI InChI=1S/2BrH.Sr/h2*1H;/q;;+2/p-2 Y Key: YJPVTCSBVRMESK-UHFFFAOYSA-L Y InChI=1S/2BrH.Sr/h2*1H;/q;;+2/p-2 Key: YJPVTCSBVRMESK-NUQVWONBAI Key: YJPVTCSBVRMESK-UHFFFAOYSA-L
SMILES [Sr+2].[Br-].[Br-]
Properties
Chemical formula	SrBr2
Molar mass	247.428 g/mol (anhydrous) 355.53 g/mol (hexahydrate)
Appearance	white crystalline powder
Density	4.216 g/cm3 (anhydrous) 2.386 g/cm3 (hexahydrate)
Melting point	643 °C (1,189 °F; 916 K)
Boiling point	2,146 °C (3,895 °F; 2,419 K)
Solubility in water	107 g/100 mL
Solubility	soluble in alcohol insoluble in ether
Structure
Crystal structure	tetragonal
Vapor pressure	{{{value}}}
Related compounds
Other anions	strontium fluoride strontium chloride strontium iodide
Other cations	Beryllium bromide Magnesium bromide Calcium bromide Barium bromide Radium bromide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Strontium bromide is a chemical compound with a formula SrBr₂. At room temperature it is a white, odorless, crystalline powder. Strontium bromide burns bright red in a flame test. It is used in flares and also has some pharmaceutical uses.

Structure

At room temperature, strontium bromide adopts a crystal structure with a tetragonal unit cell and space group P4/n. This structure is referred to as α-SrBr₂ and is isostructural with EuBr₂ and USe₂. Around 920 K (650 °C), α-SrBr₂ undergoes a first-order solid-solid phase transition to a much less ordered phase, β-SrBr₂, which adopts the cubic fluorite structure. The beta phase of strontium bromide has a much higher ionic conductivity of about 1 S cm⁻¹, comparable to that of molten SrBr₂, due to extensive disorder in the bromide sublattice. Strontium bromide melts at 930 K (657 °C).

See also

• Strontium chloride

References

• http://www.webelements.com/