Abstract

Crystals of a new germanosilicate Cs₂In₂[(Ge_0.4Si_0.6)₂(Ge_0.3Si_0.7)₂(Ge_0.2Si_0.8)₂O₁₅](OH)₂ · H₂O were prepared by the hydrothermal synthesis; sp. gr. Pnma, a = 13.3159(3) Å, b = 9.2615(2) Å, c = 14.9222(4) Å. The structure was found to contain a new layered tetrahedral radical. The cores composed of InO₆ octahedra are decorated on both sides by (Si,Ge)O₄ tetrahedra, which is typical of many layered minerals, for example, of palygorskite and sepiolite. The layers were found to be corrugated due to the presence of large Cs cations in the structure. The principles of formation of anionic radicals are considered. The diversity of anionic radicals is attributed to various symmetrical-topological types of chains and different types of connectedness and arrangement in layers and frameworks in terms of symmetry. Two new hypothetical layers containing four-, six-, and eight-membered rings are predicted based on a deerite chain identified in the layer of the new compound.

中文翻译：

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具有新的波纹四面体层的锗硅酸盐Cs 2 In 2 [（Si 2.1 Ge 0.9）2 O 15]（OH）2·H 2 O：基于拓扑对称性的阴离子自由基预测

摘要

通过水热合成制备了新的锗硅酸盐Cs ₂ In ₂ [（Ge _0.4 Si _0.6）₂（Ge _0.3 Si _0.7）₂（Ge _0.2 Si _0.8）₂ O ₁₅ ]（OH）₂ ·H ₂ O的晶体。sp。gr。Pnma，a＝ 13.3159（3）），b＝ 9.2615（2），c＝ 14.9222（4）。发现该结构包含新的层状四面体自由基。由InO ₆组成的核心八面体的两面都装饰有（Si，Ge）O ₄四面体，这是许多层状矿物的典型特征，例如坡缕石和海泡石。由于在结构中存在大的Cs阳离子，发现这些层是波纹状的。考虑了阴离子自由基的形成原理。阴离子自由基的多样性归因于链的各种对称拓扑类型，以及就对称性而言，层和框架中连接和排列方式的不同类型。基于在新化合物层中识别出的鹿特链，预测了两个新的假设的包含四元，六元和八元环的层。