Copper(I) bromide

Green solid

Fixed

4.98 g · cm -3

492 ° C

1345 ° C

Sparingly soluble in water

2,117

Attention

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Copper (I ) bromide is a copper salt of the hydrogen bromide with the formula CuBr ratio. Copper is in the oxidation state of 1.

Representation

Copper ( I) bromide may be prepared by the reaction of elemental copper with hydrobromic acid.

Another synthesis possibility is the reduction of copper ( II) bromide. As a reducing agent, for example, sulfite can serve.

Also possible is the synthesis by reaction of copper sulphate pentahydrate with potassium and sulfur dioxide.

Properties

The actual salt is colorless. Its greenish color it gets from impurities of copper ( II ) ions. Copper ( I) bromide is insoluble in most solvents. It is sparingly soluble in water, but soluble in hydrogen halide acids, nitric acid and aqueous ammonia. Copper ( I) bromide occurs in three modifications. Below 391 ° C there is a γ - CuBr ago with a crystal structure of zinc-blende - type and the space group F43m (a = 5.691 Å). β - CuBr with a crystal structure of wurtzite - type occurs between 391 ° C and 470 ° C. α - CuBr with a cubic crystal structure above 470 ° C.

Use

One application of copper ( I) bromide is the Sandmeyer reaction. Here it is used as a catalyst for the synthesis of aryl bromides from aryl amines.