E. Nazarchuk, O. Siidra, D. Charkin, Yana G. Tagirova
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引用次数: 0
Abstract
Abstract A new rubidium uranyl silicate, Rb2(UO2)2O(Si3O8) (1), was obtained using high-temperature approach from the melt in silica tubes. Its crystal structure was solved by direct methods: hexagonal, P6/m, a = 27.7992(7), c = 7.2346(2) Å, V = 4841.8(3) Å3, R1 = 0.033. The structure of 1 represents a new structure type with unprecedented topology not observed before among U(VI) oxides and oxysalts. It is comprised of layers with large voids derived from the U3O8 structure formed exclusively by pentagonal UrO5 bipyramids. The low-occupied Rb sites are located in the interlayer space. The SiO4 silicate tetrahedra in the structure of 1 share vertices to form rolled [Si6O16]8− chains. The nanotubules [(UO2)(Si6O16)]6− penetrate through both U3O8-derived layers and Rb interlayer. These tubules are attached to the U3O8 derived sheets via uranyl-uranyl interactions and edge-sharing between silicate tetrahedra and UrO5 bipyramids.
摘要采用高温法制备了一种新型铀酰硅酸铷，Rb2(UO2)2O(Si3O8)(1)。用直接法求解其晶体结构:六边形，P6/m, a = 27.7992(7)， c = 7.2346(2) Å， V = 4841.8(3) Å3, R1 = 0.033。1的结构代表了一种新的结构类型，具有前所未有的拓扑结构，在U(VI)氧化物和氧盐中从未见过。它由具有大空隙的层组成，这些空隙来自于由五边形UrO5双金字塔形成的U3O8结构。低占用的Rb位点位于层间空间。结构为1的SiO4硅酸盐四面体共用顶点，形成滚动的[Si6O16]8−链。纳米管[(UO2)(Si6O16)]6−穿透u3o8衍生层和Rb中间层。这些小管通过铀酰-铀酰相互作用和硅酸盐四面体与UrO5双体之间的边共享附着在U3O8衍生薄片上。
期刊介绍：
Zeitschrift für Kristallographie – Crystalline Materials was founded in 1877 by Paul von Groth and is today one of the world’s oldest scientific journals. It offers a place for researchers to present results of their theoretical experimental crystallographic studies. The journal presents significant results on structures and on properties of organic/inorganic substances with crystalline character, periodically ordered, modulated or quasicrystalline on static and dynamic phenomena applying the various methods of diffraction, spectroscopy and microscopy.
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