Cuprous bromide extra pure

Cuprous bromide extra pure is a high-purity form of copper(I) bromide (CuBr), typically with a minimum assay of 97–98%, appearing as a white to pale green or light green powder that may darken to green or blue on exposure to light or air.​

Identity and Composition

Chemical name: Cuprous bromide; Copper(I) bromide (anhydrous).​

Molecular formula: CuBr; molecular weight 143.45 g/mol.​

Grade specifications: Extra pure with min. 97% assay; low impurities like Fe ≤0.05%, SO4 ≤0.5%, As ≤0.005%.​

Physical Properties

Appearance: White, pale green, or light green powder/crystal; turns green/dark blue in sunlight.​

Density: 4.71–4.98 g/cm³.​

Melting point: 504 °C; boiling point: 1345 °C.​

Solubility: Insoluble in water and acetone; soluble in HBr, HCl, NH4OH; slightly soluble in cold water, decomposes in hot water.​

Typical Uses

Extra pure cuprous bromide serves as a catalyst in organic synthesis (e.g., Sandmeyer, Ullmann coupling, ATRP polymerization), in photochemistry and photography emulsions, gas purification (e.g., acetylene removal), and material science for semiconductors.​

Handling and Safety

Classified with hazards like skin/eye irritation and respiratory issues (H315, H319, H335); GHS07 pictogram, signal word 'Warning'. Store in closed containers away from light/moisture; handle dust carefully to avoid inhalation.​

For catalog purposes: “Cuprous bromide, extra pure, CuBr min. 97%, pale green powder, mp 504 °C, insoluble in water, catalyst for organic synthesis; causes skin/eye irritation.”