Ammonium hydrogenselenate(IV)

Acta Cryst. (2006). E62, i38–i40 [doi:10.1107/S1600536806003850]

One of the starting materials for aqueous ammonium selenate(IV) solutions, which are frequently used for precipitation of other, more insoluble selenate(IV) compounds, is NH₄(HSeO₃). This compound is accessible by dissolving SeO₂ in an ammonia solution and by subsequent recrystallization. The crystal structure comprises NH₄⁺ cations and trigonal-pyramidal HSeO₃^– anions, the latter containing two short Se–O bonds and one long Se–OH bond. The structure packing is accomplished by an intricate network of weak hydrogen bonds, with donor–acceptor distances (N…O and O…O) between 2.80 and 3.07 Å.

M. Weil