Crystal structure of sodium di­hydrogen arsenate

Acta Crystallographica Section E: Crystallographic Communications

Weil, M.¹  Ring, J.²  Lindenthal, L.²  Stö³ 

[1] Institute for Chemical Technologies and Analytics, Division of Structural Chemistry, TU Wien, Getreidemarkt 9/164-SC, A-1060 Vienna, Austria;TU Wien, Getreidemarkt 9/164-SC, A-1060 Vienna, Austria;X-Ray Centre, TU Wien, Getreidemarkt 9, A-1060 Vienna, Austria

关键词: CRYSTAL STRUCTURE;    ISOTYPISM;    SODIUM ARSENATE;    HYDROGEN BONDING;   

DOI  :  10.1107/S2056989017013470

学科分类：数学（综合）

来源: International Union of Crystallography

【 摘 要 】

Single crystals of the title compound, Na(H2AsO4), were obtained by partial neutralization of arsenic acid with sodium hydroxide in aqueous solution. The crystal structure of Na(H2AsO4) is isotypic with 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) Å] between adjacent H2AsO4− anions are observed within and perpendicular to the layers. The isotypic structure of Na(H2PO4) is comparatively discussed.

【 授权许可】

CC BY