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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Crystal growth and structure refinement of K4Ge9
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Crystal growth and structure refinement of K4Ge9

机译:K4Ge9的晶体生长和结构细化

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摘要

Deep-red moisture and air sensitive single crystals of K4Ge9 were obtained by reacting GeO2 and elemental Ge with metallic W and K at high temperature in a niobium ampoule. The crystal structure of the compound was determined by single crystal X-ray diffraction experiments. K4Ge9 crystallizes in a polar space group R3c (No. 161), Z = 4 with a = 21.208(1) and c = 25.096(2) angstrom. The compound contains discrete Ge-9(4-) Wade's nidoclusters which are packed according to a hierarchical atom-to-cluster replacement of the Cr3Si prototype and are separated by K+ cations. Two independent [Ge-9](4-) clusters A (at Cr positions) and B (at Si positions) are found with a ratio A:B = 3:1. The B-type cluster satisfactorily represents orientational disorder around the three-fold axis.
机译:通过在铌安瓿中使GeO2和元素Ge与金属W和K在高温下反应,获得K4Ge9的深红色水分和空气敏感单晶。该化合物的晶体结构通过单晶X射线衍射实验确定。 K4Ge9在极性空间群R3c(编号161)中结晶,Z = 4,a = 21.208(1),c = 25.096(2)埃。该化合物包含离散的Ge-9(4-)Wade的Nidocluster,这些簇根据Cr3Si原型的原子到簇的替换而堆积,并被K +阳离子隔开。发现两个独立的[Ge-9](4-)簇A(在Cr位置)和B(在Si位置),比率为A:B = 3:1。 B型簇令人满意地表示围绕三重轴的方向性混乱。

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