Cobalt(II) bromide

Cobalt(II) bromide is an inorganic compound with the chemical formula CoBr₂. It is a red crystalline solid that is highly soluble in water. Cobalt(II) bromide is used in various applications, including as a catalyst in organic synthesis and in the preparation of other cobalt compounds.

Structure and Properties

Cobalt(II) bromide crystallizes in a layered structure similar to that of cadmium chloride. Each cobalt ion is surrounded by six bromide ions in an octahedral geometry. The compound exhibits a high degree of ionic character, which accounts for its solubility in polar solvents such as water.

Preparation

Cobalt(II) bromide can be prepared by the direct reaction of cobalt metal with bromine gas:

<math>\text{Co} + \text{Br}_2 \rightarrow \text{CoBr}_2</math>

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

<math>\text{CoO} + 2\text{HBr} \rightarrow \text{CoBr}_2 + \text{H}_2\text{O}</math>

Applications

Cobalt(II) bromide is used as a catalyst in organic reactions, particularly in the synthesis of certain pharmaceuticals and fine chemicals. It is also employed in the preparation of other cobalt compounds, such as cobalt(II) bromide complexes, which are used in research and industrial applications.

Safety and Handling

Cobalt(II) bromide should be handled with care, as it is a hazardous material. It can cause skin and eye irritation, and prolonged exposure may lead to more serious health effects. Appropriate personal protective equipment, such as gloves and goggles, should be used when handling this compound.

Also see

• Cobalt(II) chloride
• Cobalt(II) sulfate
• Cobalt compounds
• Bromine
• Inorganic chemistry