Rubidium sulfide

Rubidium sulfide is an inorganic compound and a salt with the chemical formula Rb₂S. It is a white solid with similar properties to other alkali metal sulfides.

Rubidium sulfide

Names
IUPAC name Rubidium sulfide
Identifiers
CAS Number	31083-74-6
3D model (JSmol)	Interactive image
PubChem CID	13710577
InChI InChI=1S/2Rb.S/q2*+1;-2 Key: AHKSSQDILPRNLA-UHFFFAOYSA-N
SMILES [S-2].[Rb+].[Rb+]
Properties
Chemical formula	Rb2S
Molar mass	203.00
Appearance	white crystal
Density	2.912 g/cm^3[1]
Melting point	530 °C[2]
Solubility in water	hydrolyses to rubidium bisulfide[1]
Solubility in ethanol and glycerol	soluble
Structure
Crystal structure	cubic:anti-fluorite
Hazards
Main hazards	toxic
GHS pictograms
GHS Signal word	Danger
GHS hazard statements	H314, H400
GHS precautionary statements	P260, P264, P273, P280, P301+330+331, P303+361+353, P304+340, P305+351+338, P310, P321, P363, P391, P405, P501
Related compounds
Other anions	rubidium oxide rubidium selenide rubidium telluride rubidium polonide
Other cations	lithium sulfide, sodium sulfide, potassium sulfide, caesium sulfide, francium sulfide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Production

By dissolving hydrogen sulfide into rubidium hydroxide solution, it will produce rubidium bisulfide, followed by rubidium sulfide.[3][4]

${\displaystyle \mathrm {RbOH+H_{2}S\longrightarrow RbHS+H_{2}O} }$

${\displaystyle \mathrm {RbHS+RbOH\longrightarrow Rb_{2}S+H_{2}O} }$

Properties

Physical properties

Rubidium sulfide has a cubic crystal similar to lithium sulfide, sodium sulfide and potassium sulfide, known as the anti-fluorite structure. Their space groups are ${\displaystyle Fm{\bar {3}}m}$. Rubidium sulfide has a crystal lattice unit cell dimension of a = 765.0 pm.[1]

Chemical properties

Rubidium sulfide reacts with sulfur in hydrogen gas to form rubidium pentasulfide, Rb₂S₅.[4][5]

References

1. Jean D'Ans, Ellen Lax: Taschenbuch für Chemiker und Physiker. 3. Elemente, anorganische Verbindungen und Materialien, Minerale, Band 3. 4. Auflage, Springer, 1997, ISBN 978-3-5406-0035-0, S. 692 (, p. 692, at Google Books).
2. Dale L. Perry, Sidney L. Phillips: Handbook of inorganic compounds. CRC Press, 1995, ISBN 978-0-8493-8671-8, S. 336 (, p. 336, at Google Books).
3. Wilhelm Blitz, Ernst Wilke-Dörfurt: "Über Sulfide des Rubidiums und Cäsiums" in Zeitschr. f. anorg. Chem. 1906. 48, S. 297–317. Volltext
4. R. Abegg, F. Auerbach: 'Handbuch der anorganischen Chemie'. Verlag S. Hirzel, Bd. 2, 1908. S. 430.Volltext
5. Wilhelm Blitz, Ernst Wilke-Dörfurt: Ueber die Pentasulfide des Rubidiums und Cäsiums. In Ber. d. dt. chem. Ges. 1905, 38, 1, S. 123–130, doi:10.1002/cber.19050380114.