Rubidium 37 Rb 85.4678(3)   Switch element to... actinium aluminium aluminum americium antimony argon arsenic astatine barium berkelium beryllium bismuth bohrium boron bromine cadmium caesium calcium californium carbon cerium cesium chlorine chromium cobalt copper curium darmstadtium dubnium dysprosium einsteinium erbium europium fermium fluorine francium gadolinium gallium germanium gold hafnium hassium helium holmium hydrogen indium iodine iridium iron krypton lanthanum lawrencium lead lithium lutetium magnesium manganese meitnerium mendelevium mercury molybdenum neodymium neon neptunium nickel niobium nitrogen nobelium osmium oxygen palladium phosphorus platinum plutonium polonium potassium praseodymium promethium protactinium radium radon rhenium rhodium roentgenium rubidium ruthenium rutherfordium samarium scandium seaborgium selenium silicon silver sodium strontium sulfur sulphur tantalum technetium tellurium terbium thallium thorium thulium tin titanium tungsten ununbium ununhexium ununoctium ununpentium ununquadium ununtrium uranium vanadium xenon ytterbium yttrium zinc zirconium Go adjacent...   K Ca   Rb Sr   Cs Ba

Compounds of rubidium:

rubidium (I) bromide

• Formula as commonly written: RbBr
• Hill system formula: Br₁Rb₁
• CAS registry number: [7789-39-1]
• Formula weight: 165.372
• Class: bromide

Synonyms

• rubidium (I) bromide
• rubidium bromide

Physical properties

• Colour: white
• Appearance: crystalline solid
• Melting point: 693°C; 682°C
• Boiling point: 1340°C
• Density: 3350 kg m^-3

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Element analysis and oxidation numbers

Synthesis

One way to make rubidium bromide is to react the hydroxide with hydrobromic acid. The resulting salt can then be purified by recrystallization.

RbOH(aq) + HBr(aq) → RbBr(aq) + H₂O(l)

Rubidium(I) bromide can also be made by the neutralization of rubidium(I) carbonate with hydrobromic acid. The resulting salt can then be purified by recrystallization.

Rb₂(CO₃)(aq) + 2HBr(aq) → 2RbBr(aq) + H₂O(l) + CO₂(g)

While not a normal route of preparation because of the expense, rubidium metal reacts vigorously with all the halogens to form rubidium halides. So, it burns with bromine, Br₂, to form rubidium(I) bromide, RbBr.

2Rb(s) + Br₂(g) → 2RbBr(s)

Solid state structure

• Geometry of rubidium: 6 coordinate: octahedral
• Prototypical structure: NaCl (rock salt)

Isotope pattern

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

Formula: Rb₁Br₁

mass  %
164  73.6 _____________________________________
165   0.0 
166 100.0 __________________________________________________
167   0.0 
168  27.6 ______________

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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