10049-05-5

Basic information

• Product Name: Chromium(II) chloride
• Synonyms: Chromiumdichloride;Chromium(II) chloride;Chromous chloride
• CAS NO: 10049-05-5
• Molecular Formula: Cl₂Cr
• Molecular Weight: 122.90
• EINECS: 233-163-3
• Mol File: 10049-05-5.mol
• Article Data: 3

Chemical Properties

• Boiling Point: °Cat760mmHg
• Flash Point: °C
• Appearance: grey green powder
• Density: g/cm³
• CAS DataBase Reference: Chromium(II) chloride(CAS DataBase Reference)
• NIST Chemistry Reference: Chromium(II) chloride(10049-05-5)
• EPA Substance Registry System: Chromium(II) chloride(10049-05-5)

Safety Data

• Hazardous Substances Data: 10049-05-5(Hazardous Substances Data)

Usage

General Description

Chromium(II) chloride, also known as chromous chloride, is a chemical compound with the formula CrCl2. It is a blue-green solid that is highly soluble in water. Chromium(II) chloride is used as a catalyst in organic synthesis and as a reagent in the production of other chromium compounds. It is also used in the manufacturing of pigments and dyes. In its solid form, chromium(II) chloride adopts a polymeric structure and has been studied for its magnetic properties. It is important to handle chromium(II) chloride with caution as it is considered toxic and can pose health risks if not handled properly.

InChI:InChI=1S/2ClH.Cr/h2*1H;/q;;+2/p-2

Synthetic route

chromium(III) chloride (10025-73-7) → chromium tetrachloride (15597-88-3) + chromium (II) chloride (10049-05-5)

Conditions	Yield
In neat (no solvent) byproducts: Cl2; vaporization of anhydrous CrCl3 in vac. at 780°C;; detected by mass-spectroscopy of gas phase and IR-spectroscopy after matrix isolation;;

chromium (7440-47-3) + silver(I) chloride → chromium (II) chloride (10049-05-5)

Conditions	Yield
In neat (no solvent) in situ (650°C); isolation in N2 solid matrix;
In neat (no solvent, solid phase) mixt. of metal (tenfold excess) and AgCl heated in Ar (400 Torr) until react. was complete; cooled, evacuated, co-condensed with solid matrix (N2 or Ar);

chromium monochloride (49681-65-4) → chromium (7440-47-3) + chromium (II) chloride (10049-05-5)

Conditions	Yield
In neat (no solvent, gas phase) equilibrium reaction was studied at 1425-1596 K;

5-formyl-2-[2-(5-methyl-2-phenyl-4-oxazolyl)-ethoxy]pyridine (157169-61-4) + ethyl 1-bromocyclobutane-1-carboxylate (35120-18-4) + chromium (II) chloride (10049-05-5) → ethyl 1-(hydroxy{6-[2-(5-methyl-2-phenyl-1,3-oxazol-4-yl)ethoxy]pyridin-3-yl}methyl)cyclobutanecarboxylate

Conditions	Yield
With lithium iodide In tetrahydrofuran; water; ethyl acetate	37%

[(4-methoxybenzenesulfonyl)-2-oxo-athyl)-amino]acetic acid t-butyl ester + E-styryl iodide (42599-24-6) + chromium (II) chloride (10049-05-5) + nickel(II) chloride (7718-54-9) → (+)-(E)-[(2-hydroxy-4-phenyl-but-3-enyl)-(4-methoxybenzenesulphonyl)-amino]-acetic acid t-butyl ester

Conditions	Yield
In N-methyl-acetamide

21-acetoxy-3,3-ethylenedioxy-20-nitropregna-5,16-dien-9α-ol (124926-67-6) + chromium (II) chloride (10049-05-5) + zinc (7440-66-6) → 21-acetoxy-9α-hydroxy-20-hydroxyiminopregna-4,16-dien-3-one

Conditions	Yield
With hydrogenchloride In water; acetone
With hydrogenchloride In water; acetone

chromium (II) chloride (10049-05-5) + 2-(N,N-dimethylaminomethyl)phenyllithium (56174-66-4) → bis(2-dimethylaminomethylphenyl)chromium

Conditions	Yield
In tetrahydrofuran; toluene; pentane

chromium (II) chloride (10049-05-5) + 2-(dimethylamino)benzyllithium (64308-58-3) → bis-(2-dimethylaminobenzyl)chromium

Conditions	Yield
In tetrahydrofuran; toluene; pentane

manganese (7439-96-5) + chromium (II) chloride (10049-05-5) + tert-butyl-chlorosilane (98194-56-0) + 2-bromo-4-methoxy-6-nitrophenol (115929-59-4) → 7-Bromo-2-phenyl-benzooxazol-5-ol (440122-89-4) + 7-bromo-5-methoxy-2-phenyl-benzooxazole (440123-25-1)

Conditions	Yield
With benzaldehyde In N-methyl-acetamide; hexane; water; ethyl acetate

iron monochloride (27846-09-9) + chromium (II) chloride (10049-05-5) → chromium monochloride (49681-65-4) + iron(II)chloride (7758-94-3)

Conditions	Yield
In neat (no solvent, gas phase) equilibrium reaction was studied at 1349-1596 K;

Upstream product

• 49681-65-4 chromium monochloride 
• 7440-47-3 chromium 
• 10025-73-7 chromium(III) chloride 

Downstream Products

• 49681-65-4 chromium monochloride 
• 7758-94-3 iron(II)chloride 
• 440122-89-4 7-Bromo-2-phenyl-benzooxazol-5-ol 
• 440123-25-1 7-bromo-5-methoxy-2-phenyl-benzooxazole 

Relevant articles and documents

Interatomic distances for some first row transition element dichlorides isolated in cryogenic matrices using x-ray absorption fine structure spectroscopy

X-ray absorption fine structure (XAFS) data for several 3d transition metal dichlorides isolated in nitrogen, argon, or methane matrices have been collected and analyzed.The bond lengths obtained are in reasonable agreement with those from vapor phase ele

Matrix isolation and Mass Spectrometric Studies on the Vaporisation of Chromium(III) Chloride. The Characterisation of Molecular CrCl4 and CrCl3

Mass spectrometric and matrix isolation i.r. studies on the vaporisation of solid chromium(III) chloride over the temperature range 550-800 deg C reveal three different molecular chromium halides.At the lowest temperatures, CrCl4 is identified as the most volatile species and its tetrahedral structure confirmed by isotope patterns.At ca. 600 deg C, a new molecular species, CrCl3, appears and its structure is similarly shown to be planar (D3h).Further heating to ca. 780 deg C results in the formation of molecular CrCl2.The results are discussed in the light of previous studies on transition metal halide systems.