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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Hydrogen bonds in the monoammoniates of potassium and cesium amide [German]
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Hydrogen bonds in the monoammoniates of potassium and cesium amide [German]

机译：钾和铯酰胺的单铵盐中的氢键[德语]

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摘要

X-ray structure determination was carried out on the monoammoniates of potassium and cesium amide. Crystals of KNH2 (.) NH3 were grown from liquid NH3 at 50 degreesC > T > 20 degreesC. They crystallize in the cold part of a pressure resistant glass apparatus. Single crystals of CsNH2 (.) NH3 were obtained by zone-melting at -30 degreesC in x-ray capillaries. The following data characterize the crystal chemistry of the compounds: KNH2 (.) NH3 Cmc2(1), Z = 4 21 degreesC a = 3.938(1) Angstrom, b = 10.983(3) Angstrom, c = 5.847(1) Angstrom CsNH2 . NH3 Pnma, Z = 4 -30 degreesC a = 7.103(1) Angstrom, b = 5.390(1) Angstrom, c = 10. 106(2) Angstrom For CsNH2 (.) NH3 all hydrogen atom positions were successfully refined. The structure of both ammoniates may be described by a distorted hexagonal close packed arrangement of cations with the NH3 molecules in the octahedral and the NH2- anions in the trigonal bipyramidal interstices. The three H atoms of the NH3 molecules are involved in hydrogen bridge bonds to two amide ions with d(N(NH3)N-...(NH2-)) = 2.60 Angstrom for the K and 3.19 Angstrom for the Cs compound and to a further NH3 molecule with d(N(NH3)N-...(NH3)) = 2.98 Angstrom for the K and 3.56 Angstrom for the Cs compound. Structural relationship of the ammoniates to the monohydrates of KOH and RbOH is discussed. [References: 8]
机译：X射线结构测定是对钾和铯酰胺的单铵盐进行的。在50°C> T> 20°C的条件下，从液态NH3中生长出KNH2（。）NH3晶体。它们在耐压玻璃设备的较冷部分结晶。 CsNH 2（。）NH 3的单晶是通过在-30℃下在X射线毛细管中区域熔融而获得的。以下数据表征了化合物的晶体化学性质：KNH2（。）NH3 Cmc2（1），Z = 4 21摄氏度a = 3.938（1）埃，b = 10.983（3）埃，c = 5.847（1）埃CsNH2 。 NH3 Pnma，Z = 4 -30℃a = 7.103（1）埃，b = 5.390（1）埃，c =10。106（2）埃对于CsNH2（。）NH3，所有氢原子位置均已成功精制。两种氨化物的结构都可以通过变形的六边形紧密堆积的阳离子来描述，其八面体中的NH3分子和三角型双锥体间隙中的NH2-阴离子。 NH3分子的三个H原子参与氢桥键与两个酰胺离子的氢桥键，K化合物的d（N（NH3）N -...（NH2-））= 2.60埃，Cs化合物的分子量为3.19埃。另一个NH3分子，其d（N（NH3）N -...（NH3））对于K为2.98埃，对于Cs化合物为3.56埃。讨论了氨化物与KOH和RbOH一水合物的结构关系。 [参考：8]

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