Rubidium compounds: dirubidium sulphide

rubidium symbol icon

The rubidium in dirubidium sulphide formally is in the oxidation state 1.

Crystal structure of dirubidium sulphide

Dirubidium sulphide

  • Formula as often written: Rb2S
  • Hill system formula: Rb2S1
  • CAS registry number: [31083-74-6]
  • Formula weight: 203.002
  • Class: sulphide


  • dirubidium sulphide
  • rubidium(I) sulphide
  • dirubidium sulfide
  • rubidium sulfide
  • rubidium sulphide
  • rubidium(I) sulfide

Physical properties

  • Colour: white, yellow or red
  • Appearance:
  • Melting point: 530°C; 425°C (decomposes)
  • Boiling point:
  • Density: 2910 kg m-3


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Element analysis

Element percentages for the elements in dirubidium sulphide
Element %
Rb 84.20
S 15.80


One way to make rubidium sulphide is to reduce the sulphate with carbon.

Rb2SO4(s) + 2C(s) → Rb2S(s) + 2CO2(g)

Solid state structure

  • Geometry of rubidium: 4 coordinate: tetrahedral
  • Prototypical structure:

Crystal structure of dirubidium sulphide

Isotope pattern

What follows is the calculated isotope pattern for the Rb2S unit with the most intense ion set to 100%.

Formula: Rb2S1

mass  %
202 100.0 __________________________________________________
203 0.8
204 81.6 _________________________________________
205 0.6
206 18.3 _________
207 0.1
208 0.7
209 0.0
210 0.0


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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rubidium atomic number