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Copper(I) bromide

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Title: Copper(I) bromide  
Author: World Heritage Encyclopedia
Language: English
Subject: Copper(II) bromide, Copper(I) iodide, Inorganic compounds by element, Copper, Caesium hexafluorocuprate(IV)
Collection: Bromides, Copper Compounds, Metal Halides
Publisher: World Heritage Encyclopedia

Copper(I) bromide

CuBr redirects here. For the 'Centro Universitario de Bienestar Rural', see FUNDAEC.'
Copper(I) bromide
Sample of copper(I) bromide
Structure of CuBr
Other names
Cuprous bromide
ChemSpider  Y
Jmol-3D images Image
Molar mass 143.45 g/mol
Appearance green powder (see text)
Density 4.71 g/cm3, solid
Melting point 492 °C (918 °F; 765 K)
Boiling point 1,345 °C (2,453 °F; 1,618 K)
slightly soluble
Solubility soluble in HCl, HBr, ammonium hydroxide, acetonitrile
negligible in acetone, sulfuric acid
1.46 D
Flash point Non-flammable
US health exposure limits (NIOSH):
PEL (Permissible)
TWA 1 mg/m3 (as Cu)[1]
REL (Recommended)
TWA 1 mg/m3 (as Cu)[1]
TWA 100 mg/m3 (as Cu)[1]
Related compounds
Other anions
Copper(I) chloride
Copper(I) iodide
Other cations
Silver(I) bromide
Copper(II) bromide
Mercury(I) bromide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 Y  (: Y/N?)

Copper(I) bromide is the synthesis of organic compounds.


  • Preparation, basic properties, structure 1
  • Applications in organic chemistry 2
  • References 3
  • External links 4

Preparation, basic properties, structure

The pure solid is colourless, although samples are often colored due to the presence of copper(II) impurities (see picture).[2] The copper(I) ion also oxidizes easily in air. It is commonly prepared by the reduction of cupric salts with sulfite in the presence of bromide.[3] For example, the reduction of copper(II) bromide with sulfite yields copper(I) bromide and hydrogen bromide:

2 CuBr2 + H2O + SO32− → 2 CuBr + SO42− + 2 HBr

CuBr is insoluble in most solvents due to its polymeric structure, which features four-coordinated, tetrahedral Cu centers interconnected by bromide ligands (ZnS structure). Upon treatment with Lewis bases, CuBr converts to molecular adducts. For example with dimethyl sulfide, the colorless complex is formed:[4]

CuBr + S(CH3)2 → CuBr(S(CH3)2)

In this coordination complex, the copper is two-coordinate, with a linear geometry. Other soft ligands afford related complexes. For example triphenylphosphine gives CuBr(P(C6H5)3), although this species has a more complex structure.

Applications in organic chemistry

In the Sandmeyer reaction, CuBr is employed to convert diazonium salts into the corresponding aryl bromides:[3]

ArN2+ + CuBr → ArBr + N2 + Cu+

The aforementioned complex CuBr(S(CH3)2) is widely used to generate

  • Web Elements

External links

  1. ^ a b c "NIOSH Pocket Guide to Chemical Hazards #0150".  
  2. ^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
  3. ^ a b This report gives a procedure for generating CuBr: Jonathan L. Hartwell (1955). "o-Chlorobromobenzene".  .
  4. ^ a b Jarowicki, K.; Kocienski, P. J.; Qun, L. "1,2-Metallate Rearrangement: (Z)-4-(2-Propenyl)-3-Octen-1-ol" Organic Syntheses, Collected Volume 10, p.662 (2004).


and Cu-catalyzed Cross-Dehydrogenative Couplings (CDC). Atom Transfer Radical Polymerization for catalysts Related CuBr complexes are [4]

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