Hydrothermal Synthesis and Crystal Structure of a Novel Selenite-chloride: [Cd4(SeO3)2Cl4(H2O)]n with a Three-dimensional Framework

A novel three-dimensional (3-D) compound [Cd-4(SeO3)(2)Cl-4(H2O)](n) (1) was prepared from a hydrothermal reaction and structurally characterized. Compound 1 crystallizes in the space group Fmmm of the orthorhombic system with eight formula units in a cell: a = 15.5165(4), b = 17.5090(9), c = 7.3318(5) angstrom, V = 1991.9(2) angstrom(3), Cd4Cl4H2O7Se2, M-r = 863.38, D-c = 5.758 g/cm(3), S = 1.075, mu(MoK alpha) = 16.820 mm(-1), F(000) = 3088, R = 0.0427 and wR = 0.1220. Compound 1 features a 3-D structure with the cadmium atoms having two different coordination environments, i. e., six-and eight-coordination geometries. Two different chain-like structures of cadmium-oxo polyhedra are interconnect to each other to give a 2-D layer of [Cd-4(SeO3)(2)(H2O)](n)(4n+). Between the [Cd-4(SeO3)(2)(H2O)](n)(4n+) layers is a novel chloride layer. A 3-D framework is constructed from these [Cd-4(SeO3)(2)(H2O)](n)(4n+) layers linked by the chloride layers.