A New Cadmium(II) Coordination Polymer Incorporating a 3D Framework with 1D Channels Bridged by Flexible Cyclohexane-1,2,4,5-tetracarboxylate Ligand
The hydrothermal reaction of Cd(OAc)(2)center dot 2H(2)O, 4,4'-bpy and cyclohexane-1,2,4,5-tetracarboxylic acid (H(4)L) yields a three-dimensional (3D) coordination porous framework [Cd(2)L(I)(4,4'-bpy)(1.5)(H(2)O)(2)](n)center dot 2nH(2)O, which was characterized by single-crystal X-ray diffraction (MoK alpha radiation, lambda = 0.71073 angstrom), elemental analysis and IR. This complex crystallizes in the monoclinic system, space group C2/c with a = 25.951(3), b = 11.6618(12), c = 20.046(2) angstrom, beta = 114.863(2)degrees, V = 5504.4(10) angstrom(3), Z = 8, D(c) = 1.900 g/cm(3), M(r) = 787.30, mu = 1.615 mm(-1), F(000) = 3128, the final R = 0.0978 and wR = 0.1780. The structure of the complex is a 3D coordination Cd-carboxylate framework consisting of 1D hexagonal channels along the c-axis filled with the bridging 4,4'-bpy ligands. The 4,4'-bpy ligands with two kinds of conformations are located alternately in the channels through coordination and hydrogen interactions to support the whole porous framework, in which the conformation-flexible cyclohexane-1,2,4,5-tetraearboxylate ligand adopts the I (e,a,a,e) conformation and acts as a pentadentate ligand to connect five Cd(n) atoms via the carboxylate groups in different coordination modes.
coordination polymer; cadmium(II); cyclohexane-1,2,4,5-tetracarboxylic; conformation