Organically Templated Linear and Layered Cadmium Sulfates
By reacting cadmium salts with H2SO4 in the presence of organic amines or directly with amine sulfates under hydrothermal conditions and it has been possible to prepare three linear cadmium sulfates of linarite topology and with the compositions [H3N(CH2)2NH3]2[CdCl 2(SO4)][SO4]·H2O and I and [HN(CH2)6NH][CdBr2(SO4)] and II and [HN(CH2)6NH][CdCl2(SO4)] and III. A layered cadmium sulfate of composition [H3N(CH2)3NH3][Cd2(H 2O)2(SO4)3] and IV and 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 and the CdX4O2 (X = Cl and Br) octahedron shares two trans-edges to form an [M?4] (? = 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.
G. L. Paul et al., "Organically Templated Linear and Layered Cadmium Sulfates," Dalton Transactions, no. 20, pp. 3859-3867, Royal Society of Chemistry, Sep 2002.
The definitive version is available at http://dx.doi.org/10.1039/B204482J
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