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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Syntheses and structures of the germanides CaNiGe and MgCoGe as well as chemical bonding in CaNiGe and CaNi2Ge2
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Syntheses and structures of the germanides CaNiGe and MgCoGe as well as chemical bonding in CaNiGe and CaNi2Ge2

机译:锗化物CaNiGe和MgCoGe的合成,结构以及CaNiGe和CaNi2Ge2中的化学键

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摘要

The intermetallic germanides CaNiGe and MgCoGe have been synthesized from the elements in sealed tantalum tubes in a high-frequency furnace. The compounds were investigated by Xray diffractions both on powders and single crystals: CeFeSi structure type, P4mm, a = 4.19341(3), c = 6.6264(1) angstrom, wR2 = 0.030, 124 F-2 values, 10 variable parameters for CaNiGe and a = 3.8960(4), b = 6.1929(11) angstrom, wR2 = 0.048, 104 F-2 values, 10 variable parameters for MgCoGe. In CaNiGe and MgCoGe the transition metal and germanium atoms build [TGe] layers (T = Ni, Co), which are separated by the calcium and magnesium atoms, respectively The crystal structures of CaNiGe and MgCoGe as well as chemical bonding in CaNiGe and CaNi2Ge2 are discussed in terms of LMTO bond structure calculation and analysis using the Electron Localization Function (ELF). The Ge-Ge bond formation in polyanionic (3)(infinity)[NiGe](-) network of CaNi2Ge2 can formally be regarded as oxidative coupling product of (2)(infinity)[NiGe](2-) layers of CaNiGe.
机译:金属间锗化物CaNiGe和MgCoGe是由高频炉中密封钽管中的元素合成的。通过X射线衍射在粉末和单晶上研究了这些化合物:CeFeSi结构类型,P4 / nmm,a = 4.19341(3),c = 6.6264(1)埃,wR2 = 0.030,124 F-2值,10个可变参数对于CaNiGe和a = 3.8960(4),b = 6.1929(11)埃,wR2 = 0.048、104个F-2值,10个MgCoGe可变参数。在CaNiGe和MgCoGe中,过渡金属和锗原子构成[TGe]层(T = Ni,Co),分别被钙和镁原子隔开。CaNiGe和MgCoGe的晶体结构以及CaNiGe和CaNi2Ge2中的化学键本文使用电子局部化功能(ELF)对LMTO键结构进行了计算和分析。 CaNi2Ge2的聚阴离子(3)(无穷大)[NiGe](-)网络中的Ge-Ge键形成可正式视为CaNiGe的(2)(无穷大)[NiGe](2-)层的氧化偶联产物。

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