Chromium(III) sulfide
Chromium 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 Cr0.67S.
Preparation
Chromium sulfide can be prepared through the reaction of a stoichiometric mixture of the elements at 1000 °CIt is a solid that is insoluble in water. According to X-ray crystallography, its structure is a combination of that of nickel arsenide and Cd2. Some metal-metal bonding is indicated by the short Cr-Cr distance of 2.78 Å.