摘要
The hydrothermal reaction of Cd（OAc）2·2H2O, 4,4＇-bpy and cyclohexane-1,2,4,5-tetracarboxylic acid （H4L） yields a three-dimensional （3D） coordination porous framework [Cd2LI（4,4＇-bpy）1.5（H2O）2]n·2nH2O, which was characterized by single-crystal X-ray diffraction （MoKα radiation, λ = 0.71073）, 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） A, β = 114.863（2）o, V = 5504.4（10）A^3, Z = 8, Dc = 1.900 g/cm^3, Mr = 787.30, μ = 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-tetracarboxylate ligand adopts the I （e,a,a,e） conformation and acts as a pentadentate ligand to connect five Cd（Ⅱ） atoms via the carboxylate groups in different coordination modes.
The hydrothermal reaction of Cd（OAc）2·2H2O, 4,4＇-bpy and cyclohexane-1,2,4,5-tetracarboxylic acid （H4L） yields a three-dimensional （3D） coordination porous framework [Cd2LI（4,4＇-bpy）1.5（H2O）2]n·2nH2O, which was characterized by single-crystal X-ray diffraction （MoKα radiation, λ = 0.71073）, 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） A, β = 114.863（2）o, V = 5504.4（10）A^3, Z = 8, Dc = 1.900 g/cm^3, Mr = 787.30, μ = 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-tetracarboxylate ligand adopts the I （e,a,a,e） conformation and acts as a pentadentate ligand to connect five Cd（Ⅱ） atoms via the carboxylate groups in different coordination modes.
基金
Supported by the National Natural Science Foundation of China (No. 20901018)
the Natural Science Foundation of Guangdong Province (No. 9451009101003177)
