[Open access]

Acta Cryst. (2012). E68, i82
[ doi:10.1107/S1600536812043565 ]

Redetermination of (NH4)2HAsO4

M. Weil

Abstract: In comparison with the original determination based on Weissenberg film data [Khan et al. (1970). Acta Cryst. B26, 1889-1892], the current redetermination of diammonium hydrogenarsenate(V) reveals all atoms with anisotropic displacement parameters and all H atoms localized. This allowed an unambiguous assignment of the hydrogen-bonding pattern, which is similar to that of the isotypic phosphate analogue (NH4)2HPO4. The structure of the title compound consists of slightly distorted AsO3(OH) and NH4 tetrahedra, linked into a three-dimensional structure by an extensive network of O-H...O and N-H...O hydrogen bonds.

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