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Aluminium selenide

Aluminium selenide is the inorganic compound with the formula Al<sub>2</sub>Se<sub>3</sub>.

Preparation

It is a solid prepared by igniting a mixture of the elements at :

2 Al + 3 Se → Al<sub>2</sub>Se<sub>3</sub>

The pure compound is white, but typical samples are coloured. Samples are usually protected from moisture, because they hydrolyze readily, giving off highly toxic hydrogen selenide gas:

Al<sub>2</sub>Se<sub>3</sub> + 3 H<sub>2</sub>O → Al<sub>2</sub>O<sub>3</sub> + 3 H<sub>2</sub>Se

Use

Al<sub>2</sub>Se<sub>3</sub> has been used as a precursor to hydrogen selenide, which is released when the solid is treated with acids.

References