Overview

Copper(II) bromide, also called cupric bromide, is the inorganic salt with formula CuBr2. It contains copper in the +2 oxidation state and bromide anions. In practical settings it appears as a dark crystalline solid that dissolves in water to give colored solutions and forms hydrates under humid conditions. Basic compound data describe its stoichiometry and ionic character.

Structure and properties

As a copper(II) halide, CuBr2 exhibits coordination chemistry typical of Cu2+ and commonly forms polymeric or coordinated species and hydrates. It is moderately soluble in polar solvents and shows the chemical behavior of a Lewis acid and a source of bromide. Physical and chemical properties include:

  • Formula: CuBr2
  • Contains copper in the +2 oxidation state
  • Forms hydrated salts and coordination compounds

Preparation and reactions

Laboratory and industrial preparations include direct combination of copper metal with bromine under controlled conditions and metathesis reactions in aqueous solution (for example, exchanging anions between soluble copper(II) salts and bromide salts). It is also produced or consumed in redox reactions that interconvert Cu(II) and Cu(I) bromides. CuBr2 can act as an oxidant in some organic and inorganic transformations.

Uses and applications

Copper(II) bromide is used as a reagent in chemical synthesis, particularly when a source of bromide or a copper(II) promoter is required. Applications include bromination reactions in organic chemistry, preparation of other copper bromide species, and roles as a precursor or catalyst in selected processes. It is less commonly used than some specialized brominating reagents but remains useful where combined copper/bromide reactivity is needed. See general references for experimental details and alternatives.

Handling and distinctions

The material should be handled with standard precautions for copper salts and bromide-containing chemicals: avoid inhalation and ingestion, use protective equipment, and prevent release to the environment. It differs from copper(I) bromide (CuBr) in oxidation state, color, solubility, and reactivity; CuBr is a Cu(I) compound with different coordination and uses. For hazard and disposal guidance consult chemical safety resources. Bromide information, reagent data, and safety guidance can provide further practical details.