Copper(II) bromide

Copper(II) bromide, also known as cupric bromide, is a chemical compound with the formula CuBr₂. It is a black or dark brown solid that is soluble in water and is used in various applications, including as a catalyst in organic synthesis and in the production of copper-based lasers.

Structure and Properties

Copper(II) bromide is an ionic compound composed of copper cations (Cu²⁺) and bromide anions (Br^-). In its solid state, it forms a crystalline structure. The compound is known for its high melting point of 498 °C and decomposes at around 900 °C.

Synthesis

Copper(II) bromide can be synthesized by the direct reaction of copper metal with bromine gas:

Cu(s) + Br₂(g) → CuBr₂(s)

Alternatively, it can be prepared by the reaction of copper(II) oxide or copper(II) carbonate with hydrobromic acid:

CuO(s) + 2 HBr(aq) → CuBr₂(aq) + H₂O(l)

Applications

Copper(II) bromide is used in several applications:

• Catalysis: It serves as a catalyst in organic reactions, such as the bromination of alkenes.
• Lasers: Copper(II) bromide is used in copper vapor lasers, which emit yellow and green light and are used in dermatological treatments and other applications.
• Photography: Historically, it has been used in photographic processing.

Safety and Handling

Copper(II) bromide should be handled with care, as it is a toxic compound. It can cause irritation to the skin, eyes, and respiratory tract. Proper protective equipment, such as gloves and goggles, should be used when handling this chemical.

Also see

• Copper(II) chloride
• Copper(II) sulfate
• Bromine
• Copper