Chromium(III) sulfide

Chromium(III) sulfide is the inorganic compound with the formula Cr₂S₃. It is a brown-black solid. Chromium sulfides are usually nonstoichiometric compounds, with formulas ranging from CrS to Cr_0.67S (corresponding to Cr₂S₃).

Chromium(III) sulfide

Identifiers
CAS Number	12018-22-3 Y
3D model (JSmol)	Interactive image
ChemSpider	140177
ECHA InfoCard	100.031.477
EC Number	234-638-8
PubChem CID	159397
CompTox Dashboard (EPA)	DTXSID30893164
InChI InChI=1S/2Cr.3S/q2*+3;3*-2 Key: DBULDCSVZCUQIR-UHFFFAOYSA-N
SMILES [S-2].[S-2].[S-2].[Cr+3].[Cr+3]
Properties
Chemical formula	Cr2S3
Molar mass	200.19 g/mol
Appearance	Brown to black powder
Odor	odorless
Density	3.77 g/cm3
Melting point	1350 °C
Solubility in water	insoluble
Magnetic susceptibility (χ)	+2390.0·10−6 cm3/mol
Hazards
NFPA 704 (fire diamond)	1 0 0
NIOSH (US health exposure limits):
PEL (Permissible)	TWA 1 mg/m3[1]
REL (Recommended)	TWA 0.5 mg/m3[1]
IDLH (Immediate danger)	250 mg/m3[1]
Safety data sheet (SDS)
Related compounds
Other anions	Chromium(III) oxide Chromium(III) selenide Chromium(III) telluride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

Preparation

Chromium(III) sulfide can be prepared through the reaction of a stoichiometric mixture of the elements at 1000 °C^[2]

${\displaystyle \mathrm {2\ Cr+3\ S\longrightarrow Cr_{2}S_{3}} }$

It is a solid that is insoluble in water. According to X-ray crystallography, its structure is a combination of that of nickel arsenide (1:1 stoichiometry) and Cd(OH)₂ (1:2 stoichiometry). Some metal-metal bonding is indicated by the short Cr-Cr distance of 2.78 Å.^[3]

See also

• Brezinaite, a mineral with the formula Cr₃S₄