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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Dimensional Reduction of a Selenido Stannate Salt in Ionic Liquids to form 2D-K_2Sn_2Se_5, a Direct Heavy Analogue of an Oxo Silicate
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Dimensional Reduction of a Selenido Stannate Salt in Ionic Liquids to form 2D-K_2Sn_2Se_5, a Direct Heavy Analogue of an Oxo Silicate

机译:离子液体中Selenido型盐的尺寸减少,形成2D-K_2SN_2SE_5,一种氧代硅酸盐的直接重型类似物

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摘要

The structural motifs of SiO_2 or silicates, on one hand, and their heavier homologues of group 14 (T) and group 16 (E) elements, on the other hand, commonly differ, as the strict adherence to cornersharing is not necessary in the latter owing to larger interatomic distances. On the contrary: larger coordination numbers as well as edgesharing of the coordination polyhedra are preferred in [T_xE_y] subunits with T = Si, Ge, Sn and E = S, Se, Te. Hence, we were surprised to find a new modification of the selenido stannate K_2Sn_2Se_5, which is comprised of exclusively corner-sharing [SnSe_4] tetrahedra in a layertype anionic substructure 2D-{[Sn_2Se_5]~(2-)}. While the structure of the title compound 2D-K_2Sn_2Se_5 (1) differs significantly from the known parent compound, 3D-K_2Se_2Se_5, it shows similarities with layered silicates of the apophyllite family. To the best of our knowledge, 1 represents the first known selenido stannate with an oxo silicate-like 2D structure. It formed besides known selenido stannes upon heating 3DK_2Sn_2Se_5 in in imidazolium-based ionic liquids (C_2C_2Im)[BF_4] or (C_2C_2Im)[BF_4] in the presence of DMMP and Cd~(2+) or Zn~(2+).
机译:一方面,SiO_2或硅酸盐的结构基序,另一方面,第14组(T)和第16组(E)元素的较重同系物的结构基序通常不同,因为后者由于原子间距离较大,不需要严格遵守角共享。相反:在T=Si、Ge、Sn和E=S、Se、Te的[T_xE_y]亚基中,更大的配位数以及配位多面体的边缘共享是首选的。因此,我们惊讶地发现硒锡酸钾K_2Sn_2Se_5的一种新的改性,它由层状阴离子亚结构2D-{[Sn_2Se_5]~(2-)中唯一的角共享[SnSe_4]四面体组成。虽然标题化合物2D-K_2Sn_2Se_5(1)的结构与已知的母体化合物3D-K_2Se_2Se_5有显著差异,但它显示出与质外石族层状硅酸盐的相似性。据我们所知,1代表第一个已知的硒锡酸盐,具有类似氧硅酸盐的2D结构。在DMMP和Cd~(2+)或Zn~(2+)存在下,在咪唑基离子液体(C_2C_2Im)[BF_4]或(C_2C_2Im)[BF_4]中加热3DK_2Sn_2Se_5,除已知的硒化锡外,还形成了它。

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