Crystal structure of sodium dihydrogen arsenate
2017
Single crystals of the title compound, Na(H2AsO4), were obtained by partial neutralization of
arsenic acidwith sodium hydroxide in aqueous solution. The crystal structure of Na(H2AsO4) is
isotypicwith the phosphate analogue and the asymmetric unit consists of two sodium cations and two tetrahedral H2AsO4− anions. Each of the sodium cations is surrounded by six O atoms of five H2AsO4− groups, defining distorted octahedral
coordination spheres. In the extended structure, the sodium cations and dihydrogen arsenate anions are arranged in the form of layers lying parallel to (010). Strong hydrogen bonds [range of O⋯O distances 2.500 (3)–2.643 (3) A] between adjacent H2AsO4− anions are observed within and perpendicular to the layers. The
isotypicstructure of Na(H2PO4) is comparatively discussed.
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