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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >New Germanium-rich Compounds SrCo5-xGe9 (x=0.39 and 0.28) with Optimized Co-Ge Bonding
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New Germanium-rich Compounds SrCo5-xGe9 (x=0.39 and 0.28) with Optimized Co-Ge Bonding

机译：具有优化的Co-Ge键合的新型富锗化合物SrCo5-xGe9（x = 0.39和0.28）

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摘要

New germanium-rich compounds SrCo5-xGe9 (x = 0.39 and 0.28) ere synthesized by melting mixtures of the three elements by induction heating in niobium crucibles in a water-cooled sample chamber. Both compounds were investigated by X-ray powder and single-crystals diffraction methods; the structures have been refined on the basis of single-crystal data. The compounds crystallize with a new structure type: Pnma, Z = 4, a = 13.932(4), b = 3.957(1), c = 16.838(7) angstrom, wR(2) = 0.064, 1099 F-2 values, 93 variables for x = 0.39 and a = 13.951(3), b = 3.964(1), c = 16.869(5) angstrom, wR(2) = 0.046, 1543 F-2 values. 93 variables for x = 0.28. The complex Crystal Structure is built LIP from slabs of Ge4Co2 octahedra, which consist of five columns of face-sharing octahdra along, the b direction. The columns are connected in the ac plane by sharing vertices. These slabs are connected by {Sr@Co5Ge15} polyhedra. which share pentagonal faces of germanium atoms along b. The columns are further condensed by common edges along the a direction. Centering strontium atoms form slightly puckered layers in the ab plane. Along the c direction, the layers of strontium-centered polyhedra are interconnected by the slabs of Ge4Co2 octahedra. The Co5 site of the structure shows defects (39 % and 28 %) leading to the refined composition SrCo5-xGe9 for the investigated crystals with x = 0.39 and 0.28. The catalytic properties of the title compound with respect to the selective hydrogenation of alpha,beta-unsaturated aldehydes are discussed.
机译：通过在水冷样品室中的铌坩埚中通过感应加热将三种元素的混合物熔融来合成新的富锗化合物SrCo5-xGe9（x = 0.39和0.28）。两种化合物均通过X射线粉末和单晶衍射法研究。根据单晶数据对结构进行了改进。这些化合物会以新的结构类型结晶：Pnma，Z = 4，a = 13.932（4），b = 3.957（1），c = 16.838（7）埃，wR（2）= 0.064，1099 F-2值，对于x = 0.39和a = 13.951（3），b = 3.964（1），c = 16.869（5）埃，wR（2）= 0.046、1543 F-2值的93个变量。 x的93个变量= 0.28。复杂的晶体结构是由Ge4Co2八面体的平板LIP构建的，该平板由沿b方向的五列面共享八面体组成。这些列通过共享顶点在交流平面中连接。这些平板通过{Sr @ Co5Ge15}多面体连接。沿b共有锗原子的五边形面。这些列通过沿a方向的公共边缘进一步冷凝。居中的锶原子在ab平面中形成略微起皱的层。沿c方向，以锶为中心的多面体层通过Ge4Co2八面体板相互连接。结构的Co5位点显示出缺陷（39％和28％），从而导致所研究晶体的x = 0.39和0.28的成分细化SrCo5-xGe9。讨论了标题化合物相对于α，β-不饱和醛的选择性氢化的催化性能。

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