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A Germanate with a Collapsible Open-Framework

机译：具有可折叠开放框架的日耳曼人

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摘要

A novel open-framework germanate, vertical bar NC2H8 vertical bar vertical bar N2C6H18 vertical bar, [Ge7O14.5F2].4H(2)O denoted SU-65 (SU = Stockholm University), with 24-ring channels and a very low framework density of 8.9 Ge atoms per 1000 angstrom(3) was synthesized under hydro-solvothermal conditions. The framework of SU-65 is built of 5-connected Ge-7 clusters decorating the fee net and is a framework orientation isomer to ASU-16. Half of the 8- and 12-rings in ASU-16 are instead 10-rings in SU-65 due to the different orientations of half of the clusters in the crystal structure. Flexibility of the frameworks is also influenced by the orientation of the clusters. The unique unit cell angle in SU-65 changes upon heating, unlike ASU-16 which only undergoes changes in unit cell lengths. SU-65 undergoes significant structural changes at 180 degrees C in a vacuum, forming SU-65ht. The crystal structure of SU-65ht was investigated by rotation electron diffraction, X-ray powder diffraction, and infrared spectroscopy. Through these techniques it was deduced that SU-65ht has similar clusters, symmetry, and topology as SU-65, but one of the unit cell lengths is shortened by approximately 5 A. This corresponds to a 22% decrease in unit cell volume.
机译：一种新颖的开放式德语垂直杆NC2H8垂直杆N2C6H18垂直杆[Ge7O14.5F2] .4H（2）O表示为SU-65（SU = Stockholm University），具有24环通道和非常低的框架在水溶剂热条件下合成了每1000埃（8.9）8.9 Ge原子的密度。 SU-65的框架由装饰费用网的5个连接的Ge-7集群构建，是ASU-16的框架方向异构体。由于晶体结构中一半簇的取向不同，ASU-16中8和12环的一半改为SU-65中的10环。框架的灵活性也受群集方向的影响。 SU-65中独特的晶胞角在加热时会发生变化，这与ASU-16不同，后者仅经历晶胞长度的变化。 SU-65在真空中于180摄氏度发生重大结构变化，形成SU-65ht。 SU-65ht的晶体结构通过旋转电子衍射，X射线粉末衍射和红外光谱进行了研究。通过这些技术，可以推断出SU-65ht具有与SU-65相似的簇，对称性和拓扑，但是其中一个晶胞长度缩短了约5A。这相当于晶胞体积减少了22％。

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