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Promethium(III) bromide

Promethium(III) bromide is an inorganic compound, with the chemical formula of PmBr<sub>3</sub>. It is radioactive salt. It is a crystal of the hexagonal crystal system, with the space group of P6<sub>3</sub>/mc (No. 176).

Preparation

Promethium(III) bromide can be obtained by reacting hydrogen bromide and promethium(III) oxide:

Pm<sub>2</sub>O<sub>3</sub> + 6 HBr —<u><sup>500°C</sup></u>→ 2 PmBr<sub>3</sub> + 3 H<sub>2</sub>O

Promethium(III) bromide hydrate cannot be heated to form its anhydrous form. Instead it decomposes in water to form promethium oxybromide:

PmBr<sub>3</sub> + H<sub>2</sub>O(g) → PmOBr + 2 HBr

References