Chromium(III) sulfide - Misplaced Pages

(Redirected from Chromium sesquisulfide)

Chromium(III) sulfide
Identifiers

CAS Number	12018-22-3
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;3-2Key: DBULDCSVZCUQIR-UHFFFAOYSA-N
SMILES ....
Properties
Chemical formula	Cr₂S₃
Molar mass	200.19 g/mol
Appearance	Brown to black powder
Odor	odorless
Density	3.77 g/cm
Melting point	1350 °C
Solubility in water	insoluble
Magnetic susceptibility (χ)	+2390.0·10 cm/mol
Hazards
NFPA 704 (fire diamond)	1 0 0
NIOSH (US health exposure limits):
PEL (Permissible)	TWA 1 mg/m
REL (Recommended)	TWA 0.5 mg/m
IDLH (Immediate danger)	250 mg/m
Safety data sheet (SDS)
Related compounds
Other anions	Chromium(III) oxide Chromium(III) telluride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Y verify (what is ?) Infobox references

Chemical compound

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).

Preparation

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

\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.

References

^ NIOSH Pocket Guide to Chemical Hazards. "#0141". National Institute for Occupational Safety and Health (NIOSH).
Georg Brauer: Handbuch der präparativen anorganischen Chemie. 3., umgearb. Auflage. Band III. Enke, Stuttgart 1981, ISBN 3-432-87823-0, S. 1493
Jellinek, F. "The structures of the Chromium Sulphides" Acta Crystallographica 1957, volume 10, p620-p628 doi:10.1107/S0365110X57002200