Hydrothermal reactions of biphenyl-2,3,3A,5A-tetracarboxylic acid（H4bptc） with cobalt salt in the presence of 1,4-bis（2-pyridylmethyl）piperazin（bpmp） afforded one novel coordination polymer, namely, [Co（H2bptc...Hydrothermal reactions of biphenyl-2,3,3A,5A-tetracarboxylic acid（H4bptc） with cobalt salt in the presence of 1,4-bis（2-pyridylmethyl）piperazin（bpmp） afforded one novel coordination polymer, namely, [Co（H2bptc）（bpmp）0.5（H2O）]n（1）. Its structure was established by single-crystal X-ray diffraction analysis and further characterized by elemental analysis, IR spectra and TG analysis. Complex 1 crystallizes in monoclinic, space group P21/c with a = 11.4839（11）, b = 16.6690（16）, c = 11.5559（11） A, V = 2201.8（4） A3, Mr = 539.35, Dc = 1.627 g/cm^3, μ（MoK α） = 0.841 mm-1, F（000） = 1108, Z = 4, the final R = 0.0309 and w R = 0.0705 for 4090 observed reflections（I 2σ（I））. Complex 1 displays a one-dimensional（1D） chain bridged by bpmp. Two carboxylic groups of H4 bptc ligand adopt μ01-η1：η1 and μ1-η1：η coordination modes to bridge adjacent Co（Ⅱ） ions together with bpmp ligand to give alternately arranged left- and right-handed helical chains. In addition, variable-temperature magnetic susceptibility measurements indicate that complex 1 shows weak antiferromagnetic interactions between the adjacent Co（Ⅱ） ions.展开更多
A novel cobalt（Ⅱ） coordination polymer, [Co（tdc）（bpmp）（H2O）]n（1）, was hydrothermally synthesized using 2,5-thiophenedicarboxylate（tdc） and bis（4-pyridylmethyl）piperazine（bpmp） ligand as the organic li...A novel cobalt（Ⅱ） coordination polymer, [Co（tdc）（bpmp）（H2O）]n（1）, was hydrothermally synthesized using 2,5-thiophenedicarboxylate（tdc） and bis（4-pyridylmethyl）piperazine（bpmp） ligand as the organic linkers. X-ray single-crystal diffraction determination reveals that 1 crystallizes in the monoclinic Cc space group, with a = 18.836（2）, b = 5.9540（7）, c = 20.414（2） A, β = 97.4300（10）°, V = 2270.1（5） A3, Z = 4, Mr = 515.44, Dc = 1.508 Mg/m^3, μ = 0.890 mm-1, F（000） = 1068, the final R = 0.0263 and w R = 0.0665 for 3714 observed reflections with I 2σ（I）. In compound 1, the Co（Ⅱ） ions are connected by tdc2- anions to form a 1D double chain, and such chains are further linked by bpmp ligands to form a three-dimensional（3D） structure. Topologically, the structure of 1 represents a uninodal 3D dia（6^6） topology. What＇s more, powder X-ray diffraction patterns and photocatalytic property for 1 have also been investigated.展开更多
基金supported by the National Natural Science Foundation of China(No.21273101 and 21302082)the Foundation of the Program for Backbone Teachers in Universities of Henan Province(No.2012GGJS158)
文摘Hydrothermal reactions of biphenyl-2,3,3A,5A-tetracarboxylic acid（H4bptc） with cobalt salt in the presence of 1,4-bis（2-pyridylmethyl）piperazin（bpmp） afforded one novel coordination polymer, namely, [Co（H2bptc）（bpmp）0.5（H2O）]n（1）. Its structure was established by single-crystal X-ray diffraction analysis and further characterized by elemental analysis, IR spectra and TG analysis. Complex 1 crystallizes in monoclinic, space group P21/c with a = 11.4839（11）, b = 16.6690（16）, c = 11.5559（11） A, V = 2201.8（4） A3, Mr = 539.35, Dc = 1.627 g/cm^3, μ（MoK α） = 0.841 mm-1, F（000） = 1108, Z = 4, the final R = 0.0309 and w R = 0.0705 for 4090 observed reflections（I 2σ（I））. Complex 1 displays a one-dimensional（1D） chain bridged by bpmp. Two carboxylic groups of H4 bptc ligand adopt μ01-η1：η1 and μ1-η1：η coordination modes to bridge adjacent Co（Ⅱ） ions together with bpmp ligand to give alternately arranged left- and right-handed helical chains. In addition, variable-temperature magnetic susceptibility measurements indicate that complex 1 shows weak antiferromagnetic interactions between the adjacent Co（Ⅱ） ions.
基金supported by the Natural Science Foundation of Henan Province(132300410326)
文摘A novel cobalt（Ⅱ） coordination polymer, [Co（tdc）（bpmp）（H2O）]n（1）, was hydrothermally synthesized using 2,5-thiophenedicarboxylate（tdc） and bis（4-pyridylmethyl）piperazine（bpmp） ligand as the organic linkers. X-ray single-crystal diffraction determination reveals that 1 crystallizes in the monoclinic Cc space group, with a = 18.836（2）, b = 5.9540（7）, c = 20.414（2） A, β = 97.4300（10）°, V = 2270.1（5） A3, Z = 4, Mr = 515.44, Dc = 1.508 Mg/m^3, μ = 0.890 mm-1, F（000） = 1068, the final R = 0.0263 and w R = 0.0665 for 3714 observed reflections with I 2σ（I）. In compound 1, the Co（Ⅱ） ions are connected by tdc2- anions to form a 1D double chain, and such chains are further linked by bpmp ligands to form a three-dimensional（3D） structure. Topologically, the structure of 1 represents a uninodal 3D dia（6^6） topology. What＇s more, powder X-ray diffraction patterns and photocatalytic property for 1 have also been investigated.
