配合物{[Pr(pdc)(Hpdc)(OH2)2]·3H2O}n的合成和结构表征

利用硝酸镨和2,6-二羧酸吡啶反应,得到了一维链状配位化合物{[Pr(pdc)(Hpdc)(OH2)2]·3H2O}n.通过X-射线单晶衍射、红外光谱、元素分析和热失重分析对其结构进行了表征.中心错离子的配位数为9,配齿原子来自三个2,6-二羧酸吡啶配体和两个水分子,其中一个羧酸配体起到桥连作用,从而形成一维链状化合物.     

双吡啶酰胺-金属超分子配合物的合成机理探究

以2,6-二氨基吡啶和吡嗪羧酸为原料,设计合成了双吡啶酰胺多功能桥联配体2,6-双吡嗪酰胺吡啶(L),它是通过把氨基官能团连接到芳香羧酸骨架上的、大骨架酰胺类桥联配体,用配体与过渡金属离子在溶剂热下反应合成了[Ni4(LO)4],[Cu4(LO)4]?H2O,{[Cu4(LO)4][Cu4(LO)4]}?2DMF 3个双吡啶酰胺-金属超分子配合物.通过IR、EA、MS、XRD对合成的配合物进行了表征和性能研究.研究了配体由L转变成配体LO反应机理,提出了金属离子配位协助的氧化机理.     

Zig-Zag链状配位聚合物{[Cu(L)(4,4'-bpy)]·ClO4}n的合成、晶体结构及磁性

合成了一个新颖的一维Cu(Ⅱ)配位聚合物{[Cu(L)(4,4'-bpy)]·C1O4}n[L=N-(2-羟乙基)水杨醛亚胺,bpy=4,4'-联吡啶].X-射线单晶衍射结果表明,该配合物属正交晶系,Pbcn(60)空间群·晶胞参数a= 1.316 48(19)nm,6=1.219 52(17)nm,c=2.503 7(4)nm.配体N-(2-羟乙基)水杨醛亚胺以三齿方式配位,其 配位原子包括酚羟基氧原子,醇羟基氧原子和亚胺基氮原子.在[Cu(L)(bpy)]·ClO4单元中,4,4'一联吡啶作为桥联配体,联接相邻单元中的Cu(1)离子,形成一维Zig-Zag链状结构.变温磁化率测定结果表明,在配合物中,通过4,4'-联吡啶联接的Cu(Ⅱ)离子之间存在弱铁磁偶合作用.     

一维梯状结构Cu(Ⅱ)配合物的合成、结构与性质研究

选用2,6-H2ndc为主配体,344-pytpy为辅助配体,在水热条件下与Cu(NO3)2?2.5H2O反应,得到了1个新的配合物[Cu2(2,6-ndc)2(344-pytpy)(H2O)3DMF],其中2,6-H2ndc=2,6-萘二羧酸,344-pytpy=2,6-二(4'-吡啶基)-4-(3'-吡啶基)吡啶.X射线单晶衍射分析表明,Cu1与2个羧基氧原子,1个氮原子,2个水分子配位,而Cu2中1个DMF配位取代了Cu1中的1个水分子,两者均为五配位四面体构型.Cu1、Cu2通过含氮辅助配体桥连,形成一维梯状结构.该配合物具有良好的热稳定性.     

一维配位聚合物{ HgBr2[μ2-Cu (C26H22O2N4)]｝n的合成与晶体结构

金属有机配体[Cu(L)2](L-=2-(3-吡啶甲基亚胺甲基)苯酚基)作为构筑单元与HgBr2反应,合成了一维配位聚合物{HgBr2[μ2-Cu(C26H22O2N4)]}n.X-射线单晶结构分析表明该配合物为单斜晶系,空间群为C2/c,晶胞参数为:a=2.814 49(13) nm,b=0.624 53(3) nm...     

一维螺旋状配合物[Cu(C9H7O5)2(Py)2(H2O)]n的合成与晶体结构

合成了一种新型的配合物[Cu(C9H7O5)2(Py)2(H2O)]n(C9H7O5为4-羧基苯氧乙酸根阴离子,Py为吡啶),并对其进行了元素分析,IR和单晶X-射线的表征.该配合物属于单斜晶系,空间群为C 2/c,晶胞参数a=1.503(7)(nm),b=0.581(3)(nm),c=3.174(16)(nm);β=101.60(12)(°),V=2.720(2)(nm3),Mr=629.04,Z=4,R indices[I＞2sigma(I)]R1=0.0867,wR2=0.1987;R indices(all data)R1=0.1422,wR2=0.2291.Cu原子为五配位的四方锥构型,每个Cu都分别与两个4-羧基苯氧乙酸根配体中的一个羧基氧及两个吡啶氮配位形成四方形底,再与H2O以Cu-O键配位,则O原子在四方锥的顶点上,以此配位单元为构筑块由分子间氢键连接成一维螺旋链.     

3-吡啶甲酰基丙酮酸乙酯铜配合物的合成和结构

以3-乙酰基吡啶和草酸二乙酯为原料,合成得到3-吡啶甲酰基丙酮酸乙酯(简称HL),核磁共振氢谱表明该物质的β-二酮部分在溶液中采取烯醇式结构.通过界面扩散法合成了该配体的第一个配合物{CuL2}n,并用单晶X-射线衍射进行了详细的结构分析.该配位聚合物中Cu(II)与4个L-配体形成拉长的反式Cu N_2(OO)_2八面体配位构型.2种晶体学独立的L~-配体都是以β-二酮基的2个O原子螯合1个Cu(II),以吡啶N原子与另一个Cu(II)配位,形成二维网格结构.     

基于水杨醛的三维Cu(Ⅱ)配合物的合成和结构研究

以水杨醛(HL)与Cu(NO3)2.3H2O在少量三乙胺存在的CH3OH溶剂中,室温挥发的方法培养出无色配合物[Cu(L)2n].晶体结构分析表明,配合物属于单斜晶系P2(1)/c空间群.Cu(Ⅱ)中心采取四配位的平面四边形构型.水杨醛配体采用双齿螯合配位模式,通过氧原子与铜配位形成配位化合物.配位单元之间通过碳原子和碳原子以及氧原子间氢键作用形成最终的三维结构.     

一种管状钴配合物的结构、电化学及荧光性质

以N,N’-双(吡啶-3-基甲基)-4-(4-羧基苄基)氧基苯二甲酰胺(L)为中性构筑单元,以间苯二甲酸(1,4-H₂pht)为阴离子配位单元,以Co²⁺为阳离子节点,采用环境友好的水热合成法得到一种一维金属-有机配位聚合物[Co(L)(pht)](1),并利用元素分析、红外光谱、粉末X射线衍射等表征手段对其进行测试。单晶结构分析表明,两个L配体利用吡啶N原子与Co²⁺配位形成四元双金属-有机环(Co-L)₂。pht^2-阴离子利用处于对称位置的两个羧基以单齿配位模式连接Co²⁺形成pht与Co²⁺交替拓展的一维金属-有机链(Co-pht)_n。金属-有机链(Co-pht)_n和金属-有机环(Co-L)₂在Co²⁺的共同连接下形成一维管状配位聚合物。该配合物表现出较好的相纯度、稳定的电化学行为以及4-硝基苯酚的荧光传感性质,有望成为一种新型光电功能材料。     

开放骨架稀土羧酸配合物的合成与结构表征

采用H2O/DMF混合溶剂热技术,选择咪唑羧酸衍生物和草酸混合配体与稀土金属铽配位合成了具有开放骨架结构的稀土咪唑羧酸配合物:[Tb(HpyimdC)(C2O4)0.5(H2O)]·(H2O)3(配合物1).X-射线单晶衍射等测试结果表明配合物1结晶在单斜晶系,C2/c空间群(No.15);草酸与稀土铽螯合配位形成一维zigzag链,再通过异位吡啶基咪唑羧酸的配位作用连接形成配合物1的三维开放骨架结构,沿y,z轴具有穿插超大孔道,客体分子位于孔道中.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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