IUCr journals

Ammonium hydrogenselenate(IV)

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

[Ammonium hydrogenselenate]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