Caesium sulfide

Cesium sulfide is an inorganic salt with a chemical formula Cs₂S. It is a strong alkali in aqueous solution. In the air, cesium sulfide emits rotten egg smelling hydrogen sulfide.

Caesium sulfide

cesium sulfide
Names
IUPAC name Cesium sulfide
Identifiers
CAS Number	12214-16-3 Y
3D model (JSmol)	Interactive image
ChemSpider	22499401
PubChem CID	14496896
CompTox Dashboard (EPA)	DTXSID20561022
InChI InChI=1S/2Cs.S/q2*+1;-2 Key: QTNDMWXOEPGHBT-UHFFFAOYSA-N
SMILES [S-2].[Cs+].[Cs+]
Properties
Chemical formula	Cs2S
Molar mass	297.876 g/mol
Appearance	White crystal
Density	4.19 g·cm−3[1]
Melting point	480 °C[2]
Solubility in water	Hydrolyzes to form caesium bisulfide[3]
Solubility in ethanol and glycerol	Soluble
Structure
Crystal structure	cubic, anti-fluorite
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	toxic
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H314, H400
Precautionary statements	P260, P264, P273, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P391, P405, P501
Related compounds
Other anions	Caesium oxide Caesium selenide Caesium telluride Caesium polonide
Other cations	Lithium sulfide Sodium sulfide Potassium sulfide Rubidium 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

Similar to sodium sulfide, anhydrous cesium sulfide can be produced by reacting cesium and sulfur in THF. It needs ammonia or naphthalene to react.^[4]

2 Cs + S → Cs₂S

By dissolving hydrogen sulfide into cesium hydroxide solution, it will produce cesium bisulfide, then it will produce cesium sulfide too.^[5][6]。

CsOH + H₂S → CsHS + H₂O

CsHS + CsOH → Cs₂S + H₂O