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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >First Mixed Alkaline Uranyl Molybdates: Synthesis and Crystal Structures of CsNa3[(UO2)(4)O-4(Mo2O8)] and Cs2Na8[(UO2)(8)O-8(Mo5O20)]
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First Mixed Alkaline Uranyl Molybdates: Synthesis and Crystal Structures of CsNa3[(UO2)(4)O-4(Mo2O8)] and Cs2Na8[(UO2)(8)O-8(Mo5O20)]

机译：第一混合的碱性铀酰钼酸盐：CsNa3 [（UO2）（4）O-4（Mo2O8）]和Cs2Na8 [（UO2）（8）O-8（Mo5O20）]的合成和晶体结构

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Two new mixed alkaline uranyl molybdates CsNa3[(UO2)(4)O4Mo2O8] (1) and Cs2Na8[(UO2)(8)O-8(Mo5O20)] (2) have been obtained by high-temperature solid state reactions. Their crystal structures have been solved by direct methods: Compound 1: triclinic, P (1) over bar, a = 6.46(1), b = 6.90(1), c = 11.381(2) angstrom, alpha = 84.3(1), beta = 91.91(1), gamma = 80.23(1)degrees, V = 488.6(2) angstrom(3), R-1 = 0.06 for 2865 unique reflections with |F-o| >= 4 sigma(F); Compound 2: orthorhombic, Ibam, a = 6.8460(2), b = 23.3855(7), c = 12.3373(3) angstrom, V = 1975.2(1) angstrom(3), R-1 = 0.049 for 2120 unique reflections with |F-o| >= 4 sigma(F) The structure of 1 contains complex sheets of UrO(5) pentagonal bipyramids and molybdenum polyhedra. The sheets have [(UO2)(2)O-2(MoO5)] composition. Natrium and cesium atoms are located in the interlayer space. Cesium items are situated between the molybdenum clusters, whereas natrium atoms are segregated between the uranyl complexes. The large Cs+ ions are localized between the Mo2O9 groups and force the molybdenum polyhedra to rotate relative to the [(UO2)(2)O-2(MoO5)] sheets. Such rotation is impossible for U6+ polyhedra due to their rigid edge-sharing complexes. The distance between the U6+ polyhedra vertices of neighboring layers is 3.8 angstrom, that allows the Na+ ion to be positioned between the uranyl groups. The crystal structure of 2 is based upon a framework consisting of [(UO2)(2)O-2(MoO5)] sheets parallel to (010). The sheets are linked into a 3-D framework by sharing vertices with the Mo(2)O-4 tetrahedra, located between the sheets. Each MoO4 tetrahedron shares two of its corners with two MoO6 octahedra in the sheet above, and the other two with MoO6 octahedra of the sheet below. Thus four MoO6 octahedra and one MoO4 tetrahedron form chains of composition Mo5O18. The resulting framework has a system of channels occupied by the Cs+ and Na+ ions.
机译：通过高温固态反应获得了两种新的混合碱式铀酰钼钼酸盐CsNa3 [（UO2）（4）O4Mo2O8]（1）和Cs2Na8 [（UO2）（8）O-8（Mo5O20）]（2）。它们的晶体结构已通过直接方法解决：化合物1：三斜晶，棒上的P（1），a = 6.46（1），b = 6.90（1），c = 11.381（2）埃，alpha = 84.3（1） ，β= 91.91（1），伽玛= 80.23（1）度，V = 488.6（2）埃（3），R-1 = 0.06，对于2865次具有| Fo |的唯一反射> = 4西格玛（F）;化合物2：斜方晶系，伊巴姆族，a = 6.8460（2），b = 23.3855（7），c = 12.3373（3）埃，V = 1975.2（1）埃（3），R-1 = 0.049对于2120次唯一反射|焦点| > = 4 sigma（F）1的结构包含UrO（5）五边形双锥体和钼多面体的复杂薄片。片材具有[（UO2）（2）O-2（MoO5）]组成。钠和铯原子位于层间空间中。铯元素位于钼簇之间，而钠原子则分离在铀酰络合物之间。大的Cs +离子位于Mo2O9基团之间，并迫使钼多面体相对于[（UO2）（2）O-2（MoO5）]片旋转。由于U6 +多面体的刚性边缘共享复合物，因此这种旋转是不可能的。相邻层的U6 +多面体顶点之间的距离为3.8埃，这使Na +离子位于铀酰之间。 2的晶体结构基于由平行于（010）的[（UO2）（2）O-2（MoO5）]片组成的骨架。通过与位于图纸之间的Mo（2）O-4四面体共享顶点，将图纸链接到3-D框架中。每个MoO4四面体与上表中的两个MoO6八面体共享其两个角，并在下面表中与MoO6八面体共享其他两个角。因此，四个MoO6八面体和一个MoO4四面体形成组成为Mo5O18的链。所得的框架具有由Cs +和Na +离子占据的通道系统。

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