Acta Cryst. (2013). E69, i73-i74
[ doi:10.1107/S1600536813026676 ]
Abstract: RbH2AsO4, rubidium dihydrogenarsenate (RDA), was synthesized by partial neutralization of an aqueous H3AsO4 solution with aqueous Rb2CO3. Its paraelectric room-temperature phase is composed of virtually regular tetrahedral [AsO2(OH)2]- anions and Rb+ cations, both located on -4 positions. The [AsO2(OH)2] units are connected via O-HO hydrogen bonds into a three-dimensional network, whereby the H atoms are equally disordered between the O atoms. The Rb+ cations are located in channels running along the <100> directions and coordinated by eight O atoms located at the vertices of a snub disphenoid.
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