Catalog Number
ACM10025737
Product Name
Chromium(III) chloride
Category
Metal & Ceramic Materials
Synonyms
Chromium(III) trichloride
IUPAC Name
Trichlorochromium
Canonical SMILES
Cl[Cr](Cl)Cl
InChI
InChI=1S/3ClH.Cr/h3*1H;/q;+3/p-3
InChI Key
QSWDMMVNRMROPK-UHFFFAOYSA-K
Density
2.87 g/mL at 25 °C (lit.)
Solubility
Insoluble in water
Application
Chromium(III) chloride at elevated termperatures decomposes to chromium( II) chloride and chlorine:
2CrCl3→2CrCl2 + Cl2
Heating with excess chlorine produces vapors of chromium(IV) chloride, CrCl4. The tetrahedral tetrachloride is unstable, and occurs only in vapor phase.
When heated with hydrogen, it is reduced to chromium(II) chloride with the formation of hydrogen chloride:
2CrCl3 + H2→2CrCl2 + 2HCl
Chromium(III) chloride has very low solubility in pure water. However, it readily dissolves in the presence of Cr2+ ion. Reducing agents such as SnCl2 can "solubilize" CrCl3 in water. It forms adducts with many donor ligands. For example, with tetrahydrofuran (THF) in the presence of zinc, it forms the violet crystals of the complex CrCl3•3THF.
Storage
Store below +30 °C
Color/Form
Violet, lustrous, hexagonal, crystalline scales;Red-violet crystals;Bright purple plates;
Covalently-Bonded Unit Count
4
Decomposition
When heated to decomposition it emits toxic fumes of Cl-;1300 °C;
Monoisotopic Mass
156.847063
Other Experimental
Produces violet (dilute) or green (concentrated) acid solutions;Greasy feel; also exists in hygroscopic, soluble, peach-blossom colored form;Greenish-black or violet deliquescent crystals, depending on whether chlorine is coordinated with the chromium. Density: 1.76; MP: 83 deg C. Soluble in water and alcohol; insoluble in ether /Chromium chloride hexahydrate/;pH = 2.61 at 20 deg C at a concentration of 50/g/L /Chromium chloride hexahydrate/;Chromium forms a number of compounds in various oxidation states. Those of 2+ (chromous), 3+ (chromic) and 6+ (chromates) are the most important /Chromium, alloys and cmpd/;Cr(III) is the most stable oxidation state of chromium & is always present as a coordination complex /Trivalent chromium/;Slightly soluble in water. /Trivalent chromium/;
pH
Trivalent chromium compounds are amphoteric;
Physical Description
CHROMIC CHLORIDE is a blue or green colored crystals dissolved in water. Denser than water. Corrosive to metals.;Liquid;VIOLET CRYSTALS.;
Stability
Stable under recommended storage conditions;Extremely unstable;
Topological Polar Surface Area
0 Ų