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首页> 外文期刊>Acta Crystallographica Section E: Crystallographic Communications >Crystal structure of sodium di­hydrogen arsenate
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Crystal structure of sodium di­hydrogen arsenate

机译:砷酸二氢钠的晶体结构

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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.
机译:通过在水溶液中用氢氧化钠对砷酸进行部分中和,可获得标题化合物Na(H2AsO4)的单晶。 Na(H2AsO4)的晶体结构与磷酸盐类似物是同型的,不对称单元由两个钠阳离子和两个四面体H2AsO4-阴离子组成。每个钠阳离子都被五个H2AsO4-基团的六个O原子包围,从而定义了扭曲的八面体配位球。在扩展结构中,钠阳离子和砷酸二氢根阴离子以平行于(010)的层的形式排列。在层内并垂直于层之间观察到相邻H2AsO4-阴离子之间的强氢键[O⋯O距离范围2.500(3)–2.643(3)Å]。 Na(H2PO4)的同型结构进行了比较讨论。

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