Stöger Berthold, Weil Matthias
Institute for Chemical Technologies and Analytics, Division of Structural Chemistry, Vienna University of Technology, Getreidemarkt 9/164-SC, A-1060 Vienna, Austria.
Acta Crystallogr Sect E Struct Rep Online. 2012 Feb 1;68(Pt 2):i15. doi: 10.1107/S1600536812000438. Epub 2012 Jan 11.
Single crystals of K(3)Al(2)As(3)O(12), tripotassium dialuminotriarsenate(V), were obtained unintentionally by the reaction of KAsO(3) with a corundum crucible at 973 K. The asymmetric unit contains three K, two Al, three As and 12 O atoms. The structure of the title compound is isotypic with those of other K(3)M'(2)X(3)O(12) (M' = Al, Ga; X = P, As) structures and is made up of a three-dimensional network of corner-sharing [AlO(4)] and [AsO(4)] tetra-hedra. The three K(+) cations are located in channels running along the [100], [001], [101] and [10[Formula: see text]] directions, exhibiting different coordination numbers of 9, 8 and 6, respectively. All corresponding [KO(x)] polyhedra are considerably distorted.
通过在973K下使KAsO₃与刚玉坩埚反应，意外获得了K₃Al₂As₃O₁₂（三水合二铝三砷酸钾(V)）的单晶。不对称单元包含三个K、两个Al、三个As和12个O原子。标题化合物的结构与其他K₃M'(₂)X₃O₁₂（M' = Al、Ga；X = P、As）结构同型，由共用顶点的[AlO₄]和[AsO₄]四面体的三维网络组成。三个K⁺阳离子位于沿[100]、[001]、[101]和[10[化学式：见正文]]方向的通道中，分别呈现出9、8和6的不同配位数。所有相应的[KOₓ]多面体都有相当大的畸变。
