Organically templated linear and layered cadmium sulfatesElectronic supplementary information (ESI) available: powder diffraction data for IV, view of I down the a-axis, the structure of II in the ac-plane and a polyhedral view of IV in the ab-plane. See http://www.rsc.org/suppdata/dt/b2/b204482j/
作者:Geo Paul、Amitava Choudhury、C. N. R. Rao
DOI:10.1039/b204482j
日期:2002.10.3
By reacting cadmium salts with H2SO4 in the presence of organic amines or directly with amine sulfates under hydrothermal conditions, it has been possible to prepare three linear cadmium sulfates of linarite topology, with the compositions [H3N(CH2)2NH3]2[CdCl2(SO4)][SO4]·H2O, I, [HN(CH2)6NH][CdBr2(SO4)], II, [HN(CH2)6NH][CdCl2(SO4)], III. A layered cadmium sulfate of composition [H3N(CH2)3NH3][Cd2(H2O)2(SO4)3], IV, has also been obtained. These sulfates are the first examples of a family of organically templated metal sulfates with interesting structural features. In the linarite chains, the CdX4O2
(X = Cl, Br) octahedron shares two trans-edges to form an [Mφ4] (φ
= anionic ligand) chain decorated by the SO4 tetrahedron that adopts a staggered arrangement on either side of the chain. IV is constructed by the fusion of four-membered ring ladders involving edge sharing between the sulfate tetrahedron and metal octahedron. IV appears to be the first member of a family of organically templated metal sulfates containing an octahedral–tetrahedral 2D net wherein the sulfate tetrahedron is connected at all four corners.
通过在热水条件下将镉盐与硫酸在有机胺存在下反应,或直接与胺硫酸盐反应,成功制备了三种具有线性方铅矿拓扑结构的镉硫酸盐,组成分别为 [H3N(CH2)2NH3]2[CdCl2(SO4)][SO4]·H2O(I),[HN(CH2)6NH][CdBr2(SO4)](II),[HN(CH2)6NH][CdCl2(SO4)](III)。还获得了一种层状镉硫酸盐,组成为 [H3N(CH2)3NH3][Cd2(H2O)2(SO4)3](IV)。这些硫酸盐是第一批具有有机模板金属硫酸盐的例子,具有独特的结构特征。在方铅矿链中,CdX4O2(X = Cl, Br)八面体通过两个逆向边分享,形成一种由SO4四面体装饰的 [Mφ4](φ = 阴离子配体)链,四面体在链的两侧以错排方式排列。IV则是通过四元环梯的融合构建而成,这涉及到硫酸盐四面体和金属八面体之间的边共享。IV似乎是一个有机模板金属硫酸盐家族的第一成员,该家族包含一种八面体-四面体的二维网络,其中硫酸盐四面体在所有四个角上相连。