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首页> 外文期刊>Acta Crystallographica Section E: Crystallographic Communications >An unexpected oxidation: NaK5Cl2(S2O6)2 revisited
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An unexpected oxidation: NaK5Cl2(S2O6)2 revisited

机译:意外氧化:NaK5Cl2(S2O6)2再次出现

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The title compound, NaK5Cl2(S2O6)2 [systematic name: sodium penta­potassium dichloride bis­(di­thio­nate)], arose as an unexpected product from an organic synthesis that used di­thio­nite (S2O42−) ions as a reducing agent to destroy excess permanganate ions. Compared to the previous study [Stanley (1953). Acta Cryst. 6, 187–196], the present tetra­gonal structure exhibits a root 2a × root 2a × c super-cell due to subtle changes in the orientations of the di­thio­nate anions. The structure can be visualized as a three-dimensional framework of [001] columns of alternating trans-NaO4Cl2 and KO4Cl2 octa­hedra cross-linked by the di­thio­nate ions with the inter­stices occupied by KO6Cl2 polyhedra to generate a densely packed three-dimensional framework. The asymmetric unit comprises two sodium ions (site symmetries 4 and -4, four potassium ions (site symmetries = -4, 4, 1 and 1), three chloride ions (site symmetries = 4, 4 and 2) and two half-di­thio­nate ions (all atoms on general positions). Both di­thio­nate ions are completed by crystallographic inversion symmetry. The crystal chosen for data collection was found to be rotationally twinned by 180° about the [100] axis in reciprocal space with a 0.6298 (13):0.3702 (13) domain ratio.
机译:标题化合物NaK5Cl2(S2O6)2 [系统名称:五氯化二钠双(二硫代硫酸钠)]是有机合成中意外的产物,该产物使用连二亚硫酸盐(S2O42-)离子作为还原剂来破坏过量的高锰酸根离子。与先前的研究相比[Stanley(1953)。 Acta Cryst。 [6,187–196]中,由于二硫代阴离子的方向发生了细微的变化,目前的四边形结构显示了一个根2a×根2a×c超级细胞。可以将结构可视化为[001]列的三维框架,该框架由二硫键离子交联的交替反式NaO4Cl2和KO4Cl2八面体与KO6Cl2多面体所占据的间隙,以生成密集堆积的三维框架。不对称单元包含两个钠离子(位点对称度4和-4,四个钾离子(位点对称度= -4、4、1和1),三个氯离子(位点对称度= 4、4和2)和两个半二硫代酸盐离子(所有原子都在一般位置上)。两个二硫氰酸盐离子均通过晶体学反演对称性完成,发现用于数据收集的晶体在[298]互易空间中绕[100]轴旋转了180°,并具有0.6298(13): 0.3702(13)域比。

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