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Cuprous bromide

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Cuprous bromide Basic information
Cuprous bromide Chemical Properties
  • Melting point:504 °C(lit.)
  • Boiling point:1345 °C
  • Density 4.71 g/mL at 25 °C(lit.)
  • Flash point:1345°C
  • storage temp. Keep in dark place,Inert atmosphere,Room temperature
  • form Powder
  • Specific Gravity4.98
  • color Pale green to green
  • Water Solubility Soluble in hydrogen bromide, hydrochloric acid, and ammonium hydroxide. Slightly soluble in water. Insoluble in acetone.
  • Sensitive Air Sensitive
  • Crystal StructureHexagonal, Wurtzite (Zincite) Structure - Space Group P 63mc
  • Merck 14,2659
  • Solubility Product Constant (Ksp)pKsp: 8.2
  • Stability:Stable, but may be air or light sensitive. Incompatible with alkali metals, strong oxidizing agents.
  • CAS DataBase Reference7787-70-4(CAS DataBase Reference)
  • NIST Chemistry ReferenceCopper(I) bromide(7787-70-4)
  • EPA Substance Registry SystemCopper bromide (CuBr) (7787-70-4)
Safety Information
Cuprous bromide Usage And Synthesis
  • Chemical PropertiesCopper(I) bromide is a white, cubic, crystalline material that decomposes on exposure to light or moisture in air. It forms complexes with hydrochloric and hydrobromic acids and aqueous ammonia.
  • UsesAs catalyst for organic reactions.
  • UsesCopper bromide is also known as cupric bromide, this substance was made by double decomposition when mixing aqueous solutions of copper sulfate and potassium bromide. This greenish blue solution was used as the bleaching step for intensifying collodion and gelatin negatives.
  • PreparationIt is prepared pyrometallurgically with copper metal and elemental bromine in a process similar to that for copper(I) chloride. It can also be produced by the reduction of copper(II) sulfate solutions in the presence of sodium bromide using metallic copper or sulfite as the reducing agent. Copper(I) bromide is used as a polymerization catalyst in organic reactions.
  • General DescriptionWhite powder or crystal. Turns green to dark blue on exposure to sunlight. Sinks and mixes slowly with water.
  • Air & Water ReactionsMixes slowly with water.
  • Reactivity ProfileCuprous bromide has weak oxidizing or reducing powers. Redox reactions can however still occur. The majority of compounds in this class are slightly soluble or insoluble in water. If soluble in water, then the solutions are usually neither strongly acidic nor strongly basic. These compounds are not water-reactive.
  • Health HazardINHALATION: Irritation of upper respiratory tract. EYES: Irritation of conjunctivae. SKIN: Irritation, acne-like rash (usually from prolonged exposure). INGESTION: Vomiting caused by local irritant and astringent action of ionic Cu on stomach and intestines. Pain in mouth, esophagus, and stomach. Inorganic bromides produce depression, psychoses, and mental deterioration.
  • Purification MethodsPurify it as for cuprous iodide but using aqueous NaBr. [Keller & Wycoff Inorg Synth II 3 1946, Glemser & Sauer in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol II p 1006 1965.]
Cuprous bromide Preparation Products And Raw materials
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