Rubidium bromide

Rubidium bromide

Names
IUPAC name Rubidium bromide
Other names Rubidium(I) bromide
Identifiers
CAS Number	7789-39-1
3D model (Jmol)	Interactive image
ChemSpider	74217
ECHA InfoCard	100.029.238
PubChem	4670918
InChI InChI=1S/BrH.Rb/h1H;/q;+1/p-1 Key: JAAGVIUFBAHDMA-UHFFFAOYSA-M InChI=1/BrH.Rb/h1H;/q;+1/p-1 Key: JAAGVIUFBAHDMA-REWHXWOFAB
SMILES [Rb+].[Br-]
Properties
Chemical formula	RbBr
Molar mass	165.372 g/mol
Appearance	white crystalline solid
Density	3.350 g/cm^3
Melting point	693 °C (1,279 °F; 966 K)
Boiling point	1,340 °C (2,440 °F; 1,610 K)
Solubility in water	98 g/100 mL
Hazards
Flash point	Non-flammable
Related compounds
Other anions	Rubidium fluoride Rubidium chloride Rubidium iodide Rubidium astatide
Other cations	Lithium bromide Sodium bromide Potassium bromide Caesium bromide Francium 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

Rubidium bromide is the bromide of rubidium. It has a NaCl crystal structure, with a lattice constant of 685 picometres.^[1]

There are several methods for synthesising rubidium bromide. One involves reacting rubidium hydroxide with hydrobromic acid:

RbOH + HBr → RbBr + H₂O

Another method is to neutralize rubidium carbonate with hydrobromic acid:

Rb₂CO₃ + 2HBr → 2RbBr + H₂O + CO₂

Rubidium metal would react directly with bromine to form RbBr, but this is not a sensible production method, since rubidium metal is substantially more expensive than the carbonate or hydroxide; moreover, the reaction would be explosive.

References

1. G. Chern; J. G. Skofronick; W. P. Brug; S. A. Safron (1989). "Surface phonon modes of the RbBr(001) crystal surface by inelastic He-atom scattering". Phys. Rev. B. 39 (17): 12838–12844. doi:10.1103/PhysRevB.39.12838.

• WebElements. URL accessed March 1, 2006.