Study on the Interaction Between 2, 6-bis（Benzimidazole-2-yl）PyridineAmino Aacid Lanthanum （Ⅲ） Complex and DNA

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.

Synthesis, Crystal Structure and Property of a Series of Supramolecular Polymers Based on Novel 3,5-Dimethyl- 2,6-bis(3-(pyrid-2-yl)-1,2,4-triazolyl)pyridine Ligand

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.

Syntheses, Structures, and Blue Luminescent Properties of 2,6-Bis-(benzimidazolyl) Pyridine and Its Mercury Complex

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.

POLYMERIZATION OF ETHYLENE WITH UNSYMMETRIC 2,6-BIS(IMINO)PYRIDINE IRON(Ⅱ)COMPLEX

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.

2,6-二苦胺基吡啶合成工艺优化研究

本研究以NaHCO_3为缚酸剂,工业乙醇为溶剂,三硝基氯苯和二氨基吡啶为原料合成2,6-二苦胺基吡啶、分别测试了三硝基氯苯与二氨基吡啶的物质的量之比,NaHCO_3的用量,反应时间,反应温度等因素对产物收率的影响。实验结果表明:在固定二氮基吡啶用量为0.41g的情况下,n(三硝基氯苯):n(二氨基吡啶)=2.2:1,NaHCO_3的用量为0.74g,反应温度为76℃,反应时间3小时的条件下,产品收率可大于93%。

绿色溶剂法制备2,6-二苦氨基吡啶的研究

采用水作为溶剂,以2,6-二氨基吡啶(DAP)和2,4,6-三硝基氯苯为原料,经N-烷基化反应,制得2,6-二苦氨基吡啶(PAP)。考察了相转移催化剂、反应物配比、缚酸剂用量、反应温度、反应时间等对PAP收率的影响。结果表明,优化工艺条件为:采用AEO9作相转移催化剂,n(三硝基氯苯)∶n(二氨基吡啶)=2.2∶1,n(碳酸氢钠)∶n(二氨基吡啶)=1.83∶1,反应温度95℃,反应时间为5 h。此时2,6-二苦氨基吡啶的得率可达84.6%,熔点315℃,液相色谱分析纯度为97.6%。

One POM-based Coordination Polymer with 2,6-Bis(1-imidazoly) Pyridine as the Ligand: Synthesis, Structure and Characterizations

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.

Synthesis,Crystal Structure and Properties of a Novel Coordination Polymer Based on a Trinuclear Mn(Ⅱ) Cluster:[Mn_3(bpta)_2(bip)_2]_n

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.