Sodium sulfite heptahydrate and its relation to sodium carbonate heptahydrate.,Acta Crystallographica Section C

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Sodium sulfite heptahydrate and its relation to sodium carbonate heptahydrate.
Acta Crystallographica Section C ( IF 0.7 ) Pub Date : 2020-04-20 , DOI: 10.1107/s2053229620004404
Matthias Weil ₁ , Kurt Mereiter ₁

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The monoclinic crystal structure of Na2SO3(H2O)7 is characterized by an alternating stacking of (100) cationic sodium-water layers and anionic sulfite layers along [100]. The cationic layers are made up from two types of [Na(H2O)6] octahedra that form linear 1∞[Na(H2O)4/2(H2O)2/1] chains linked by dimeric [Na(H2O)2/2(H2O)4/1]2 units on both sides of the chains. The isolated trigonal-pyramidal sulfite anions are connected to the cationic layers through an intricate network of O-H...O hydrogen bonds, together with a remarkable O-H...S hydrogen bond, with an O...S donor-acceptor distance of 3.2582 (6) Å, which is about 0.05 Å shorter than the average for O-H...S hydrogen bonds in thiosalt hydrates and organic sulfur compounds of the type Y-S-Z (Y/Z = C, N, O or S). Structural relationships between monoclinic Na2SO3(H2O)7 and orthorhombic Na2CO3(H2O)7 are discussed in detail.

中文翻译：

七水亚硫酸钠及其与七水碳酸钠的关系。

Na2SO3(H2O)7 的单斜晶体结构的特征是沿[100]方向交替堆叠(100)阳离子钠水层和阴离子亚硫酸盐层。阳离子层由两种类型的 [Na(H2O)6] 八面体组成，形成由二聚体 [Na(H2O)2/2 连接的线性 1∞[Na(H2O)4/2(H2O)2/1] 链(H2O)4/1]2 链两侧都有单位。孤立的三角锥亚硫酸根阴离子通过复杂的 OH...O 氢键网络以及显着的 OH...S 氢键连接到阳离子层，O...S 供体-受体距离为3.2582 (6) Å，比硫代盐水合物和 YSZ 型有机硫化合物（Y/Z = C、N、O 或 S）中 OH...S 氢键的平均值短约 0.05 Å。详细讨论了单斜晶系Na2SO3(H2O)7 和斜方晶系Na2CO3(H2O)7 之间的结构关系。

更新日期：2020-04-20

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