Ammonium hexachloroselenate(IV)

Ammonium hexachloroselenate(IV), also known as ammonium tetrachloroselenoate, is an inorganic chemical compound. It is a complex salt composed of ammonium cations (NH₄⁺) and hexachloroselenate(IV) anions (SeCl₆^2-). The selenium atom in the anion has an oxidation state of +4.

The compound is typically synthesized by reacting selenium dioxide (SeO₂) or selenous acid (H₂SeO₃) with hydrochloric acid (HCl) in the presence of ammonium chloride (NH₄Cl). The reaction results in the formation of ammonium hexachloroselenate(IV) which can then be crystallized from the solution.

Ammonium hexachloroselenate(IV) exists as a crystalline solid. Its chemical properties include its reactivity with water, in which it can hydrolyze, and its potential to decompose upon heating. The compound finds limited uses, typically in chemical research and as a precursor for the synthesis of other selenium-containing compounds. Its stability and handling require careful consideration due to the toxic nature of selenium compounds.