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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Synthesis and crystal structures of alpha- and beta-Mg-2[(UO2)(3)(SeO4)(5)](H2O)(16)
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Synthesis and crystal structures of alpha- and beta-Mg-2[(UO2)(3)(SeO4)(5)](H2O)(16)

机译:α-和β-Mg-2[(UO2)(3)(SeO4)(5)](H2O)(16)的合成和晶体结构

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摘要

Single crystals of alpha- and beta-Mg-2[(UO2)(3)(SeO4)(5)](H2O)(16) have been synthesized by evaporation from an aqueous solution of the ionic components. The structure of alpha-Mg-2[(UO2)(3)(SeO4)(5)](H2O)(16) (monoclinic, C2/c, a = 19.544(3), b = 10.4783(11), c = 18.020(3) Angstrom, beta = 91.352(12)degrees, V = 3689.3(9) Angstrom(3)) has been solved by direct methods and refined to R-1 = 0.048 on the basis of 4338 unique observed reflections. The structure of beta-Mg-2[(UO2)(3)(SeO4)(5)](H2O)(16) (orthorhombic, Pbcm, a = 10.3807(7), b = 22.2341(19), c = 33.739(5) Angstrom, V = 7787.2(14) Angstrom(3)) has been solved by direct methods and refined to R-1 = 0.107 on the basis of 3621 unique observed reflections. The structures of alpha- and beta-Mg-2[(UO2)(3)(SeO4)(5)](H2O)(16) are based upon sheets with the chemical composition [(UO2)(3)(SeO4)(5)](4-). The sheets are formed by corner sharing between pentagonal bipyramids [UO7](8-) and SeO42- tetrahedra. In the alpha-modification, the [(UO2)(3)(SeO4)(5)](4-) sheets are more or less planar and run parallel to (001). In the structure of the beta-modification, the uranyl selenate sheets are strongly corrugated and oriented parallel to (010). The [Mg(H2O)(6)](2+) polyhedra reside in the interlayers and provide three-dimensional linkage of the uranyl selenate sheets via hydrogen bonding. In addition to H2O groups attached to Mg2+ cations, both structures also contain H2O molecules that are not bonded to any cation. The [(UO2)(3)(SeO4)(5)](4-) sheets in the structures of alpha- and beta-Mg-2[(UO2)(3)(SeO4)(5)](H2O)(16) represent two different structural isomers. The sequences of the orientations of the tetrahedra within the sheets can be described by their orientational matrices with their shortened forms (dduddsquare/uusquareuud) and (ddsquareddsquareuusquareuusquare/uuduumdduddm) for alpha- and beta-Mg-2[(UO2)(3)(SeO4)(5)](H2O)(16), respectively. A short review on the isomerism of [(UO2)(3)(TO4)(5)](4-) sheets (T = S, Cr, Se, Mo) is given.
机译:α-和β-Mg-2[(UO2)(3)(SeO4)(5)](H2O)(16)的单晶已经通过从离子组分的水溶液中蒸发而合成。 α-Mg-2[(UO2)(3)(SeO4)(5)](H2O)(16)的结构(单斜晶系,C2 / c,a = 19.544(3),b = 10.4783(11),c = 18.020(3)埃,贝塔= 91.352(12)度,V = 3689.3(9)埃(3))已通过直接方法求解,并根据4338次独特的观察到的反射精炼为R-1 = 0.048。 β-Mg-2[(UO2)(3)(SeO4)(5)](H2O)(16)的结构(斜方晶系,Pbcm,a = 10.3807(7),b = 22.2341(19),c = 33.739 (5)埃,V = 7787.2(14)埃(3))已通过直接方法求解,并在3621次独特观察到的反射基础上细化为R-1 = 0.107。 α-和β-Mg-2[(UO2)(3)(SeO4)(5)](H2O)(16)的结构基于具有化学成分[(UO2)(3)(SeO4)( 5)](4-)。这些片是通过五角双锥体[UO7](8-)和SeO42-四面体之间的角共享而形成的。在α-修饰中,[(UO2)(3)(SeO4)(5)](4-)片或多或少是平面的并且平行于(001)。在β-修饰的结构中,铀酰硒酸酯片是强波纹状的并且平行于(010)取向。 [Mg(H2O)(6)](2+)多面体驻留在中间层中,并通过氢键提供硒酸铀酰片的三维连接。除了连接到Mg2 +阳离子上的H2O基团外,两个结构还包含未与任何阳离子键合的H2O分子。 [(UO2)(3)(SeO4)(5)](4-)处于α-和β-Mg-2[(UO2)(3)(SeO4)(5)](H2O)( 16)代表两种不同的结构异构体。薄片内四面体的取向顺序可以通过其取向矩阵来描述,其α-和β-Mg-2[(UO2)(3)( SeO4)(5)](H2O)(16)。简要回顾了[(UO2)(3)(TO4)(5)](4-)薄片(T = S,Cr,Se,Mo)的异构性。

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