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 new 3d-4f polymer formulated as {[Sm Co2（μ2-Hmimda）3（μ2-H2mimda）·4H2O]· 3H2O}n（H3mimda = 1-H-2-methyl-4,5-imidazole-dicarboxylic acid） has been hydrothermally synthesized and structurally character...A new 3d-4f polymer formulated as {[Sm Co2（μ2-Hmimda）3（μ2-H2mimda）·4H2O]· 3H2O}n（H3mimda = 1-H-2-methyl-4,5-imidazole-dicarboxylic acid） has been hydrothermally synthesized and structurally characterized by elemental analysis,X-ray single-crystal diffraction and magnetic susceptibility measurement.It crystallizes in monoclinic system,space group C2/c,with a = 17.251（6）,b = 16.965（6）,c = 14.668（5） A,β = 118.565（5）A,Z = 4,V = 3770（2） A^3,F（000） = 1984,the final R = 0.0597 and w R = 0.1820.In the crystal,the dicarboxylate ligand links the Sm（ⅡI） and Co（Ⅱ） ions to give rise to a heterometallic [Sm Co2（μ2-Hmimda）3（μ2-H2mimda）] aggregate which acts as the second building unit.Then,the SBUs further extended a 2D corrugated layer with a（4,4） topology.The title complex displays strong photoluminescence in the solid state.展开更多
A new terbium complex based on biphenyl-2,3,3’,5’-tetracarboxylic acid（H4bptc） has been synthesized, {[Tb（Hbptc）（H2O）4]×H2O}n（1）. Its structure was determined by single-crystal X-ray diffraction analysi...A new terbium complex based on biphenyl-2,3,3’,5’-tetracarboxylic acid（H4bptc） has been synthesized, {[Tb（Hbptc）（H2O）4]×H2O}n（1）. Its structure was determined by single-crystal X-ray diffraction analysis and further characterized by elemental analysis, IR spectra and TG analyses. Title complex crystallizes in monoclinic, space group P21/n with a = 14.090（2）, b = 8.0824（13）, c = 15.5591（17） ?, V = 1775.4（5） ?3, Mr = 576.22, Dc = 2.156 g/cm3, μ（Mo Kα） = 4.059 mm-1, F（000） = 1128, Z = 4, the final R = 0.027 and w R = 0.0726 for 3296 observed reflections（I > 2σ（I））. Complex 1 exhibits a 2 D layer structure, and such layers are further united together into a three-dimensional supramolecular structure through π···π interaction and intricate hydrogen bonding. The fluorescence excitation and emission spectroscopy of 1 showed that H4 bptc is a kind of highly efficient sensitizer for terbium（Ⅲ） ion. The title complex also displays efficient ligand sensitized luminescence in the visible region with long lifetime of 2.02 ms in the solid state.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 National Natural Science Foundation of China(No.21273101)Program for Science&Technology Innovation Talents in Universities of Henan(2014HASTIT014)+2 种基金Tackle Key Problem of Science and Technology Project of Henan Province(No.142102310483)Key program of Foundation of Education Committee of Henan Province(No.14B150033)Graduate Innovation Foundation Project of Nanyang Normal University(No.20141110)
文摘A new 3d-4f polymer formulated as {[Sm Co2（μ2-Hmimda）3（μ2-H2mimda）·4H2O]· 3H2O}n（H3mimda = 1-H-2-methyl-4,5-imidazole-dicarboxylic acid） has been hydrothermally synthesized and structurally characterized by elemental analysis,X-ray single-crystal diffraction and magnetic susceptibility measurement.It crystallizes in monoclinic system,space group C2/c,with a = 17.251（6）,b = 16.965（6）,c = 14.668（5） A,β = 118.565（5）A,Z = 4,V = 3770（2） A^3,F（000） = 1984,the final R = 0.0597 and w R = 0.1820.In the crystal,the dicarboxylate ligand links the Sm（ⅡI） and Co（Ⅱ） ions to give rise to a heterometallic [Sm Co2（μ2-Hmimda）3（μ2-H2mimda）] aggregate which acts as the second building unit.Then,the SBUs further extended a 2D corrugated layer with a（4,4） topology.The title complex displays strong photoluminescence in the solid state.
基金supported by the National Natural Science Foundation of China(No.21671114 and U1804131)Natural Science Foundation of Henan Province(No.182300410166,182102310909 and 182102310897)
文摘A new terbium complex based on biphenyl-2,3,3’,5’-tetracarboxylic acid（H4bptc） has been synthesized, {[Tb（Hbptc）（H2O）4]×H2O}n（1）. Its structure was determined by single-crystal X-ray diffraction analysis and further characterized by elemental analysis, IR spectra and TG analyses. Title complex crystallizes in monoclinic, space group P21/n with a = 14.090（2）, b = 8.0824（13）, c = 15.5591（17） ?, V = 1775.4（5） ?3, Mr = 576.22, Dc = 2.156 g/cm3, μ（Mo Kα） = 4.059 mm-1, F（000） = 1128, Z = 4, the final R = 0.027 and w R = 0.0726 for 3296 observed reflections（I > 2σ（I））. Complex 1 exhibits a 2 D layer structure, and such layers are further united together into a three-dimensional supramolecular structure through π···π interaction and intricate hydrogen bonding. The fluorescence excitation and emission spectroscopy of 1 showed that H4 bptc is a kind of highly efficient sensitizer for terbium（Ⅲ） ion. The title complex also displays efficient ligand sensitized luminescence in the visible region with long lifetime of 2.02 ms in the solid state.
