A 2D Wavy Parquet Architecture Based on the Biphenyl-3,3’,4,4’-tetracarboxylic Acid and Bis(2-benzimidazole)alkanes Ligands

A double-T-shaped ligand (H4BPTC) and bis(2-benzimidazole)alkanes as the spacers have been firstly used to direct the assembly of a 2D coordination polymer with wavy parquet network topology, [Zn(BPTC)0.5(H2C2EIm)(H2O)]n (1, C24H18ZnN4O5, Mr = 507.79, H4BPTC = biphenyl-3,3',4,4'-tetracarboxylic acid, H2C2EIm = 2,2'-(1,2-ethanediyl)-bis(1H-benzi- midazole), which was determined by single-crystal X-ray diffraction analysis. The crystal belongs to the monoclinic system, space group P21/n with a = 1.1844(5), b = 1.4019(5), c = 1.4026(5) nm, β = 108.359(5)°, V = 2.2104(15) nm3, Z = 4, Dc = 1.526 g/cm3, μ(MoKα) = 1.156 mm-1, F(000) = 1040, S = 1.038, the final R = 0.0427 and wR = 0.0793 for 3834 reflections with I > 2σ(I). The compound units are linked through BPTC ligands into a wavilness parquet 2D layer and further connected into a 3D framework via π-π packing interactions between the adjacent H2C2EIm ligands and weak N-H…O hydrogen bonding between uncoordinated carboxylate and the nitrogen atoms of H2C2EIm as well as the free water molecules.     

1,5-Dimethy-4-[(3-nitro-benzylidene)-amino]-2-pheyl-1,2-dihydro-pyrazol-3-one

1INTRODUCTION Antipyrine(2,3-dimethyl-1-phenyl-5-pyrazolone)and its derivatives exhibit a wide range of biological activities and applications[1~3].Antipyrine shows mi-nimal protein binding and is rapidly and completely absorbed from the gastrointestinal tract and exten-sively metabolized by the cytochrome P450liver en-zymes[4].Estimates of half-life and systemic cleara-nce of antipyrine have been used for the in vivo asse-ssment of hepatic drug oxidation in different spe-cies[5].Owing to…     

氨基酸-BrO-3-Mn2+-H2SO4-丙酮体系的振荡反应

This paper, Using potentiometric method, first reports the oscillating behavior of five amino acids (L-methionine, L-cystine, L-tryptophan, L-serine, L-tyrosine) in a new oscillating system of amino acid-BrO_3~--Mn~(2+)-H_2SO_4-acetone. The effect of many factors on oscillation have been investigated. According to Arrhenius equation, the apparent activation energy of the oscillatary induction period and oscillation period of five oscillating systems are obtained within temperature range of 20～37 ℃.     

七种草药振荡反应研究

采用电势法和振荡技术研究了党参、白术、当归、黄芪、升麻、柴胡、甘草的振荡行为，揭示了传统草药经验用量的科学依据，提出了草药用量的最佳范围为党参８～１８ｇ，白术１０～２０ｇ，当归８～１８ｇ，黄芪８～６０ｇ，升麻１０～６０ｇ柴胡１０～２０ｇ，甘草８～１８ｇ。     

研究氨基酸振荡反应的经验公式

依据实验数据，归纳出氨基酸振荡反应的经验公式，发现振荡体系的获得仅与氨基酸活性基团的数目有关。依据经验公式，可计算出该振荡体系的酸度和底物浓度，并以此获得振荡体系的各种信息。     

化学振荡速率常数的研究

根据振荡反应中存在着活性中心的观点．在大量实验数据的基础上，推导出振荡反应速率常数的计算公式。     

草药对振荡反应的影响及抑菌作用

我国秦岭以它独特的气候特点培育了大量的天然草药,在防病治病,造福人类中发挥了显著作用．对此,我们对祖国传统医学中的几十种草药进行筛选研究,发现有两种草药含有很高能量,在生物体中起到了重要作用,本文根据产地定名为秦药１号及新药２号,首次采用电势法研究了各自的能量及抑菌行为．１材料及方法（１）材料：秦岭草药１号,新疆草药２号（２）试剂：生化试剂氨基酸,分析纯Ｈ２ＳＯ４、ＭｎＳＯ４、ＫＢｒＯ３及去离子水（３）方法：反应于超级恒温槽控温的玻璃反应器中进行,温度控制在３７±０．２℃,总体积５０ｃｍ３,依次…     

基于芳香羧酸和双苯丙咪唑一维双Z型链钴配合物的水热合成、晶体结构和荧光性质研究

通过双苯丙咪唑作为含氮配体,辅以对苯二甲酸配体水热合成出了一种新型的双Z链钴配合物:[Co2(BDC)2(H2C3PIm)2(H2O)2]n(1)(H2BDC=对二苯甲酸;H2C3PIm=2,2丙基双苯丙咪唑),通过元素分析、热重以及X射线单晶洐射对其进行了表征。该晶体属正交晶系,Pca21空间群。每个Co髤原子都具有四面体配位结构,通过BDC和H2C3Pim配体连接形成Z型链结构,但由于配体BDC扭转角的不同,导致了配合物形成了由C-H…π作用与分子间氢键N-H…O,O-H…O连接的一种新颖的组成相同,结构不同的双Z型链状结构(A,B),A型Z链之间与B型Z链之间通过不同的分子间氢键相连组成三维超分子结构。室温下配合物具有较强的荧光发射光谱。     

分子模型与反应截面

本文介绍了分子构型与反应截面问的关系。通过对反应截面、势能和反应速度的计算，得到了几个具有普遍意义的公式。