A novel blue luminescent mercury （ Ⅱ ） complex of 2,6-bis （benzimidazolyl） pyridine （L） was synthesized. In solid state, this complex has the formula [Hg（L）Cl2] · 2DMF（1）. The molecular structures of b...A novel blue luminescent mercury （ Ⅱ ） complex of 2,6-bis （benzimidazolyl） pyridine （L） was synthesized. In solid state, this complex has the formula [Hg（L）Cl2] · 2DMF（1）. The molecular structures of both the ligand and the complex were determined by using tingle-crystal X-ray diffraction. Crystallographic studies of the mercury （ Ⅱ） complex reveal that the complex possesses a five-coordinated geometry that can be best described as a distorted trigonal-bipyramidal. The luminescent properties of ligand L and complex 1 both in solution and in solid state were also studied.展开更多
The study on the interaction between 2, 6- bis（benzimidazole- 2- yl） pyridine amino acidlanthanum （Ⅲ） complex and deoxyribonucleic acid （DNA） was performed by the analysis methods ofultraviolet visible spectros...The study on the interaction between 2, 6- bis（benzimidazole- 2- yl） pyridine amino acidlanthanum （Ⅲ） complex and deoxyribonucleic acid （DNA） was performed by the analysis methods ofultraviolet visible spectroscopy （UV）, fluorescence spectroscopy, viscosimetry and cyclic voltammetry.The results indicated after interaction between the complex and DNA, all of the UV absorption intensity,fluorescence intensity and viscosity decreased with the binding constant of 1.1×10^5 L/mol. And the peakpotential of oxidation and reduction peaks did not change but the redox peak currents reduced from thecyclic voltammetry. All above indicated that the complex and DNA were combined through the partialintercalation and electrostatic binding.展开更多
Solvothermal reactions of 3,5-dimethyl-2,6-bis（3-（pyrid-2-yl）-1,2,4-triazolyl） pyridine （L）, 1,4-benzendicarboxylic acid （H2bdc）, and transitional metal cations of M11 （M = Mn, Co, Cd） in the presence of oxa...Solvothermal reactions of 3,5-dimethyl-2,6-bis（3-（pyrid-2-yl）-1,2,4-triazolyl） pyridine （L）, 1,4-benzendicarboxylic acid （H2bdc）, and transitional metal cations of M11 （M = Mn, Co, Cd） in the presence of oxalic acid （H2ox） afford three novel supramolecular polymers （CPs）, namely, {[M2（ox）（L）2][bdc][M2（Hox）2（OH）（H2O）4]·3H2O}n （M = Mn for 1, Co for 2, Cd for 3）. Single-crystal X-ray diffraction analysis reveals that complexes 1-3 are isostructural and the 3D supramolecular structure was connected through non-covalent interactions. With the help of H2ox, the L ligands cheated with center atoms forming a butterfly [M2（ox）（L）2]2＋ building block. The bdc2- ligand linked with the unprecedented [M2（Hox）2（OH）2（H2O）4] units through strong O-H...O hydrogen bonds forming a zigzag chain, which are further connected through π-π interactions between L and bdc2- ligands to form a 3D supramolecular structure. Moreover, elemental analyses, IR, thermogravimetric, PXRD and luminescence have been investigated.展开更多
An unsymmetric 2,6-bis(imino)pyridine iron(II) complex 1' was synthesized. The relationship between catalyststructure and its activity in ethylene polymerization is discussed. The kinetic behavior of ethylene poly...An unsymmetric 2,6-bis(imino)pyridine iron(II) complex 1' was synthesized. The relationship between catalyststructure and its activity in ethylene polymerization is discussed. The kinetic behavior of ethylene polymerization and theeffects of polymerization conditions such as temperature, aluminum/iron molar ratio on the activity of catalyst and thecharacteristics of polyethylene were reported. The unsymmetric catalyst 1' has a good catalytic performance of 3.47×10~6 gPE·mol^(-1)·Fe·h^(-1) at 40℃ with aluminum/iron molar ratio = 2500. A dependence of catalyst activity on themethylaluminoxane (MAO) concentration and reaction temperature was found. The molecular weight (MW) of polyethylenewith broad dispersity is about 10~4-10~5 g/mol. The melting temperature and branching of polyethylenes vary with changingreaction temperature and aluminum/iron molar ratio.展开更多
One new polyoxometalate-based coordination polymer with 2,6-bis(1-imidazoly)pyridine(L)as the ligand,[Ni(L)(HL)(H2O)(H2 W12O40)0.5·H2O]n,has been synthesized under hydrothermal method and characterized by IR spec...One new polyoxometalate-based coordination polymer with 2,6-bis(1-imidazoly)pyridine(L)as the ligand,[Ni(L)(HL)(H2O)(H2 W12O40)0.5·H2O]n,has been synthesized under hydrothermal method and characterized by IR spectra,single-crystal X-ray diffraction,powder X-ray diffraction(PXRD),elemental analyses and thermogravimetric analyses(TGA).It crystallizes in orthorhombic,space group Pnma with a=20.169(7),b=23.924(8),c=15.333(5)?,V=7398(4)?3,Z=8,F(000)=6992,Dc=3.488 Mg/m3,Mr=1942.32,μ=19.177 mm-1 and the final R=0.0299,wR=0.0551.In the title compound,each Ni(Ⅱ)atom is bridged by two ligands L to form Ni2L2,which are further connected into a one-dimensional chain structure by coordination with[H2W12O40]6–polyoxoanions,and thus the ultimate 3D framework is constructed via different hydrogen bonding interactions.In addition,the cyclic voltammograms,magnetism,luminescence and photocatalytic activity towards RhB are investigated.The title compound exhibits antiferromagnetic behaviors,luminescent behaviors at solid state and photocatalytic activity to RhB.展开更多
The coordination polymer, [Mn3（bpta）2（bip）2], （H3bpta = biphenyl-3,3＇,5-tricar- boxylic acid, bip = 2,6-bis（imidazole-1-yl）pyridine）, has been synthesized under hydrothermal con- ditions and characterized by ...The coordination polymer, [Mn3（bpta）2（bip）2], （H3bpta = biphenyl-3,3＇,5-tricar- boxylic acid, bip = 2,6-bis（imidazole-1-yl）pyridine）, has been synthesized under hydrothermal con- ditions and characterized by elemental analysis, FT-IR, XRD, TGA and single-crystal X-ray diffraction. It crystallizes in monoclinic, space group P21/c with a = 14.919（3）, b = 9.780（2）, c = 20.352（7） A, V = 2344.4（10） A3, Z= 2, C52H32Mn3N10012, Mr = 1153.70, Dc = 1.634 g/cm3, p（MoKa） = 0.876 mm-1, F（000） = 1170, the finalR = 0.0605 and wR = 0.1177. The complex forms a 2D layer with trinuclear Mn（II） units and further assembles into a 3D supramolecular network structure through C-H..＇O hydrogen bonding and C-H...π interactions. Moreover, the negative J value indicates the presence of antiferromagnetic coupling between the Mn（II） ions within a trinuclear unit.展开更多
基金the National Natural Science Foundation of China(No20374023)Ministry of Science and Technology of China(No2002CB6134003)
文摘A novel blue luminescent mercury （ Ⅱ ） complex of 2,6-bis （benzimidazolyl） pyridine （L） was synthesized. In solid state, this complex has the formula [Hg（L）Cl2] · 2DMF（1）. The molecular structures of both the ligand and the complex were determined by using tingle-crystal X-ray diffraction. Crystallographic studies of the mercury （ Ⅱ） complex reveal that the complex possesses a five-coordinated geometry that can be best described as a distorted trigonal-bipyramidal. The luminescent properties of ligand L and complex 1 both in solution and in solid state were also studied.
文摘The study on the interaction between 2, 6- bis（benzimidazole- 2- yl） pyridine amino acidlanthanum （Ⅲ） complex and deoxyribonucleic acid （DNA） was performed by the analysis methods ofultraviolet visible spectroscopy （UV）, fluorescence spectroscopy, viscosimetry and cyclic voltammetry.The results indicated after interaction between the complex and DNA, all of the UV absorption intensity,fluorescence intensity and viscosity decreased with the binding constant of 1.1×10^5 L/mol. And the peakpotential of oxidation and reduction peaks did not change but the redox peak currents reduced from thecyclic voltammetry. All above indicated that the complex and DNA were combined through the partialintercalation and electrostatic binding.
基金supported by the National Natural Science Foundation of China (No. 21101097)Natural Science Foundation of Shandong Province (ZR2010BQ023)the State Key Laboratory of Solid Lubrication (No. 0701)
文摘Solvothermal reactions of 3,5-dimethyl-2,6-bis（3-（pyrid-2-yl）-1,2,4-triazolyl） pyridine （L）, 1,4-benzendicarboxylic acid （H2bdc）, and transitional metal cations of M11 （M = Mn, Co, Cd） in the presence of oxalic acid （H2ox） afford three novel supramolecular polymers （CPs）, namely, {[M2（ox）（L）2][bdc][M2（Hox）2（OH）（H2O）4]·3H2O}n （M = Mn for 1, Co for 2, Cd for 3）. Single-crystal X-ray diffraction analysis reveals that complexes 1-3 are isostructural and the 3D supramolecular structure was connected through non-covalent interactions. With the help of H2ox, the L ligands cheated with center atoms forming a butterfly [M2（ox）（L）2]2＋ building block. The bdc2- ligand linked with the unprecedented [M2（Hox）2（OH）2（H2O）4] units through strong O-H...O hydrogen bonds forming a zigzag chain, which are further connected through π-π interactions between L and bdc2- ligands to form a 3D supramolecular structure. Moreover, elemental analyses, IR, thermogravimetric, PXRD and luminescence have been investigated.
基金This work was financially supported by the National Natural Science Foundation of China (No. 29734141, 50103012) Core Research for Engineering Innovation KGCX2-203, the Foundation of "One Hundred Talents" program for W-H Sun, Chinese Academy of Sciences
文摘An unsymmetric 2,6-bis(imino)pyridine iron(II) complex 1' was synthesized. The relationship between catalyststructure and its activity in ethylene polymerization is discussed. The kinetic behavior of ethylene polymerization and theeffects of polymerization conditions such as temperature, aluminum/iron molar ratio on the activity of catalyst and thecharacteristics of polyethylene were reported. The unsymmetric catalyst 1' has a good catalytic performance of 3.47×10~6 gPE·mol^(-1)·Fe·h^(-1) at 40℃ with aluminum/iron molar ratio = 2500. A dependence of catalyst activity on themethylaluminoxane (MAO) concentration and reaction temperature was found. The molecular weight (MW) of polyethylenewith broad dispersity is about 10~4-10~5 g/mol. The melting temperature and branching of polyethylenes vary with changingreaction temperature and aluminum/iron molar ratio.
基金Supported by the National Natural Science Foundation of China(U1504209,21403053)Young Backbone Teacher Project of Henan Colleges and Universities(2016GGJS-023)Foundation of Henan University(0000A40478)。
文摘One new polyoxometalate-based coordination polymer with 2,6-bis(1-imidazoly)pyridine(L)as the ligand,[Ni(L)(HL)(H2O)(H2 W12O40)0.5·H2O]n,has been synthesized under hydrothermal method and characterized by IR spectra,single-crystal X-ray diffraction,powder X-ray diffraction(PXRD),elemental analyses and thermogravimetric analyses(TGA).It crystallizes in orthorhombic,space group Pnma with a=20.169(7),b=23.924(8),c=15.333(5)?,V=7398(4)?3,Z=8,F(000)=6992,Dc=3.488 Mg/m3,Mr=1942.32,μ=19.177 mm-1 and the final R=0.0299,wR=0.0551.In the title compound,each Ni(Ⅱ)atom is bridged by two ligands L to form Ni2L2,which are further connected into a one-dimensional chain structure by coordination with[H2W12O40]6–polyoxoanions,and thus the ultimate 3D framework is constructed via different hydrogen bonding interactions.In addition,the cyclic voltammograms,magnetism,luminescence and photocatalytic activity towards RhB are investigated.The title compound exhibits antiferromagnetic behaviors,luminescent behaviors at solid state and photocatalytic activity to RhB.
基金conducted in the framework of a project sponsored by the National Natural Science Foundation of China(No.21071100)Liaoning Baiqianwan Talents Program and the LNET(LJQ2011038)
文摘The coordination polymer, [Mn3（bpta）2（bip）2], （H3bpta = biphenyl-3,3＇,5-tricar- boxylic acid, bip = 2,6-bis（imidazole-1-yl）pyridine）, has been synthesized under hydrothermal con- ditions and characterized by elemental analysis, FT-IR, XRD, TGA and single-crystal X-ray diffraction. It crystallizes in monoclinic, space group P21/c with a = 14.919（3）, b = 9.780（2）, c = 20.352（7） A, V = 2344.4（10） A3, Z= 2, C52H32Mn3N10012, Mr = 1153.70, Dc = 1.634 g/cm3, p（MoKa） = 0.876 mm-1, F（000） = 1170, the finalR = 0.0605 and wR = 0.1177. The complex forms a 2D layer with trinuclear Mn（II） units and further assembles into a 3D supramolecular network structure through C-H..＇O hydrogen bonding and C-H...π interactions. Moreover, the negative J value indicates the presence of antiferromagnetic coupling between the Mn（II） ions within a trinuclear unit.
