Cadmium bromide

Cadmium bromide is an inorganic compound with the formula CdBr₂. It is a white crystalline solid that is highly soluble in water. Cadmium bromide is used in photography, lithography, and as a precursor to other cadmium compounds.

Structure and Properties

Cadmium bromide crystallizes in a layered structure similar to that of cadmium chloride. Each cadmium ion is coordinated by six bromide ions in an octahedral geometry. The layers are held together by van der Waals forces, allowing them to be easily cleaved.

The compound has a high melting point of 568 °C and a boiling point of 844 °C. It is highly soluble in water, forming a colorless solution.

Preparation

Cadmium bromide can be prepared by the direct reaction of cadmium metal with bromine gas:

Cd + Br₂ → CdBr₂

Alternatively, it can be synthesized by dissolving cadmium oxide or cadmium carbonate in hydrobromic acid:

CdO + 2 HBr → CdBr₂ + H₂O

Applications

Cadmium bromide is used in the photographic industry as a component of certain photographic developers. It is also used in lithography and as a precursor to other cadmium compounds, such as cadmium sulfide, which is used in quantum dots and other semiconductor applications.

Safety and Toxicity

Cadmium compounds, including cadmium bromide, are highly toxic and carcinogenic. Exposure can occur through inhalation, ingestion, or skin contact. Proper safety precautions, including the use of personal protective equipment, are essential when handling cadmium bromide.

Cadmium is a heavy metal that can cause serious health effects, including kidney damage, bone loss, and cancer. It is important to follow all safety guidelines and regulations when working with cadmium compounds.

Also see

• Cadmium chloride
• Cadmium sulfide
• Cadmium toxicity
• Heavy metal poisoning