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Alkali earth MOx (x = 6, 7, 9, 12) polyhedra tuned cadmium selenites with different dimensions and diverse SeO32− coordinations
CrystEngComm ( IF 2.6 ) Pub Date : 2017-10-02 00:00:00 , DOI: 10.1039/c7ce01461a
Ying-Jie Jia 1, 2, 3, 4 , Yi-Gang Chen 1, 2, 3, 4 , Xiao-Ni Yao 1, 2, 3, 4 , Xian-Ming Zhang 1, 2, 3, 4
Affiliation  

A series of alkali earth cadmium selenites including MgCd3(SeO3)4 (1), Ca0.7Cd2.3(SeO3)3 (2), SrCd(SeO3)2 (3) and BaCd(SeO3)2 (4) are synthesized by hydrothermal reaction and studied in detail by single crystal and powdered X-ray diffractions, thermal analyses, IR and UV spectral measurements and dipole moment calculation. 1 features a 3D anionic [Cd3(SeO3)4]2− framework constructed from isolated SeO3 trigonal pyramids and 2D [Cd3O12]n layers, in which the [Cd3O12]n layer is composed of edge-shared [Cd2O10]16− dimers and butterfly-like [Cd4O20]32− tetramers. 2 shows a smooth 2D [Cd2(SeO3)3]n layer composed of unique [Cd(SeO3)]n double chains. 3 exhibits a wavelike 2D [Cd(SeO3)2]n layer constructed from corner-shared CdO6 octahedra and isolated SeO3 trigonal pyramids. 4 displays a windmill-like 1D [Cd(SeO3)2]n chain built from zigzag [CdO4]n chain motifs and isolated SeO3 trigonal pyramids. The alkali earth oxide motifs demonstrate interesting and regular changes from isolated MgO6 octahedra, CaO7 polyhedra, and SrO9 tri-capped trigonal prisms based on a ribbon chain to BaO12 icosahedra based on a brucite-like layer, and meanwhile the SeO3 groups are observed from variable tetradentate to hexadentate coordination modes. These flexible motifs reveal that cadmium selenites are strongly affected by the size of the alkali earth cations, providing a feasible approach to modulating their space structure via selection of template cation.

中文翻译:

碱土金属氧化物xx = 6,7,9,12)多面体调谐的镉亚硒酸盐具有不同的尺寸和不同的SeO 3 2-配位

一系列碱土镉亚硒包括MGCD的3(SEO 341),钙0.72.3(SEO 332),SRCD(SEO 323)和BACD(SEO 324)是通过水热反应合成的,并通过单晶和粉末X射线衍射,热分析,IR和UV光谱测量以及偶极矩计算进行了详细研究。1具有3D阴离子[Cd 3(SeO 34]] 2−框架,由孤立的SeO 3三角金字塔和2D [Cd 3 O 12 ] n层构成,其中[Cd 3 O 12 ] n层由边缘共享的[Cd 2 O 10 ] 16-二聚体和蝴蝶组成。样[Cd 4 O 20 ] 32-四聚体。图2示出了由独特的[Cd(SeO 3)] n双链组成的光滑的二维[Cd 2(SeO 33 ] n层。图3显示了由角共享的CdO 6八面体和孤立的SeO 3三角锥构成的波浪状2D [Cd(SeO 32 ] n层。图4显示了由之字形[CdO 4 ] n链图案和孤立的SeO 3三角金字塔构成的风车状一维[Cd(SeO 32 ] n链。碱土金属氧化物基序显示出有趣的规律性变化,从孤立的MgO 6八面体,CaO 7多面体和基于带状链的SrO 9三盖三角棱镜到BaO基于水镁石样层的12个二十面体,同时从可变的四齿到六齿配​​位模式观察到SeO 3基团。这些灵活的图案表明,亚硒酸镉受到碱土金属阳离子的大小的强烈影响,从而提供了一种通过选择模板阳离子来调节其空间结构的可行方法。
更新日期:2017-11-13
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