含手性基团苯并菲衍生物的电荷传输性质

使用密度泛函理论在B3LYP/6-31G**理论水平研究含2-甲基丁氧基手性(C2H5CH(CH3)CH2O)基团苯并菲分子的电荷传输性能.结果表明,通过引入手性基团调节电荷传输矩阵元来影响电荷传输性能.3种堆积方式中,甲基同向堆积方式的能量最低,空穴或电子传输速率最大,分别为4.47×10-2和1.58×10-2cm2·V-1·s-1.     

铼、钌太阳能电池染料稳定性电喷雾质谱研究

利用电喷雾质谱(ESI-MS)对敏化纳米二氧化钛太阳能电池用染料2,2′-联吡啶-4,4′-二羧酸乙酯的铼络合物(络合物1)和钌络合物(络合物2)进行了分析,通过变换不同的源内CID电压,研究了络合物及其配体的稳定性.结果表明,由于络合物1的空间结构相对拥挤,随着CID电压升高,其中的吡啶配体容易发生离解并形成稳定的联吡啶三羰基配位离子[(4,4-(′COOEt)2-bpy)Re(CO)3] .而络合物2在较高的CID电压下(110V)会发生联吡啶环上取代基的中性C2H4小分子丢失,其单电荷离子比二价电荷离子稳定.这些是影响太阳能电池用敏化染料稳定性的主要因素.     

多吡啶配合物[Zn（4，4′-bpy）（CH3COO）（NO3）]n和[Y（bpy）2]（NO3）3的合成、表征和晶体结构

通过自组装制得 [Zn(4,4′- bpy) (CH3COO) (NO3) ]n(配合物 1)和 [Y(bpy) 2 ](NO3) 3(配合物 2 ) .其中 ,4 ,4′-bpy为 4 ,4′-联吡啶 ,bpy为 2 ,2′-联吡啶 .对配合物进行了 X-射线衍射结构表征 .配合物 1是聚合物 ,锌离子为 6配位 ,4 ,4′-联吡啶作为双齿桥联配体使配合物呈线性一维链 ,而醋酸根作为双齿桥联配体和链间的 π- π堆积作用 ,又使配合物形成一维网状的结构 .配合物 2中 Y( )是 10配位 ,2个 2 ,2′-联吡啶各提供 2个氮原子 ,3个硝酸根各提供 2个氧原子参与配位 .     

4,4′-联吡啶桥联Ni、Co三维配合物的合成与结构

由 Ni( Cl O4) 2 · 6H2 O和 Co( Cl O4) 2 · 6H2 O分别与 4 ,4′-联吡啶、1 ,4 ,7-三氮杂环壬烷 ( tacn)反应 ,得到两种配合物 [Ni( 4,4′-bpy) 3( H2 O) 2 ]( 4,4′-bpy) ( OH) ( CH3OH) ( Cl O4) ( 1 )与 [Co( 4,4′-bpy) 3( H2 O) 2 ]( 4,4′-bpy) ( OH)( CH3OH) 2 ( Cl O4) ( 2 ) ( 4,4′-bpy:4 ,4′-联吡啶 ) ,并进行了元素分析、红外光谱、X射线单晶衍射等表征 .单晶结构数据表明 ,晶体 ( 1 )属于单斜晶系 ,空间群为 C2 /c,a=1 .7990 ( 9) nm,b=1 .1 4 2 ( 6) nm,c=2 .4 433( 1 2 ) nm,β=91 .936( 1 0 )°,V=5 .0 1 7nm3,Z=4 ,该配合物由 4 ,4′-联吡啶桥联过渡金属形成一维链状结构 .单齿配位的吡啶环上的未配位氮原子与配位水形成了氢键 ,将链连接成二维铁轨型结构 .此结构再通过未配位 4 ,4′-联吡啶、配位水、氢氧根之间形成的氢键而连接成三维网状结构 .未配位的 4 ,4′-联吡啶、甲醇、氢氧根离子、高氯酸根离子被包合在这种网络中 ,展示出一定的包合现象 .此外 ,未配位的 4 ,4′-联吡啶的吡啶环与配位的 4 ,4′-联吡啶的吡啶环之间存在 π-π相互作用 .晶体 ( 2 )与晶体 ( 1 )有相同的结构特性 ,晶体也属于单斜晶系 ,空间群为 C2 /c,a=1 .790 1( 1 7) nm,b=1 .1 5 0 7( 1 1 ) nm,c=2 .4     

铀酰羧酸配合物的合成、晶体结构及光催化活性

以醋酸双氧铀为金属源,选择2,6-吡啶二羧酸(2,6-H2pdc)作为配体合成了铀酰羧酸配合物[UO2(2,6-pdc)H2O].NH(CH3)2.1.5H2O,并通过单晶X-射线衍射确定了该配合物的结构.X-射线单晶衍射结果表明:在该配合物结构中具有光催化活性的铀酰几乎垂直于金属铀和2,6-pdc配体形成的配位平面,这种结构使得铀酰在进行光催化反应时不存在任何空间位阻,因此,该配合物作为固体光催化剂在降解罗丹明B(RhB)染料中表现出比商品化TiO2(P-25)更高的光催化活性.     

新型钌(Ⅱ)三联吡啶配合物的合成及光电性质

合成了含有配体4,4″二（P-甲基苯基吡啶）-2,2′：6′,2″-三联吡啶,4,4′-二羧基-2,2′-二联吡啶以及异硫氰根配体的钌（Ⅱ）三联吡啶配合物（Ru-1）．通过紫外可见吸收光谱、发射光谱、循环伏安、基质辅助激光解吸电离-时间飞行质谱（MALDI-TOF-MASS）以及元素分析对其结构进行了表征．研究了该配合物作为光敏化剂制备的纳米晶太阳能电池的光电转化性质．结果表明：钌（Ⅱ）三联吡啶配合物在570nm以后仍有较强的金属-配体电荷转移（MLCT）态吸收,有利于改善染料敏化纳米晶太阳能电池对太阳光长波方向的吸收．以其作为敏化剂制备电池,其光电转化效率为0．68％．     

多齿配体三联吡啶衍生物的过渡金属配合物研究

以2-乙酰基吡啶和p-甲基苯甲醛为起始原料,经过三步反应,合成了一个含有N/O的配位原子的多齿配体2,2′:6′,2″-三联吡啶-4′-苯甲酸(HL).合成该配体的中间体4′-(4-溴-苯基)-[2,2′:6′,2″]三联吡啶(L′)直接和过渡金属反应(原位合成法),通过水热法,得到了两个配合物[Co(L)2]·5H2O(1)和[Ru(L)2]·5H2O(2).晶体结构研究表明,配合物1属于三斜晶系,P-1的空间群,配合物2属于四方晶系,I41/a空间群.在两个配合物中,配体L均采用端基配位模式以三个吡啶N与金属离子螯合成环,而金属离子采用的是六配位模式,与两个配体上六个吡啶N原子配位,形成了一个扭曲的八面体结构,此外还对配体HL的红外光谱、核磁、元素分析以及两个配合物的红外光谱、紫外光谱等进行了分析讨论.     

一种新型阳离子铱配合物的合成、晶体结构及光物理性能测试

以2-(对甲苯基)吡啶为环金属主配体,4,4′-二叔丁基-2,2′-联吡啶为辅助配体,合成出了一种新型阳离子型铱配合物[Ir(mppy)2(dtbbpy)]PF6(mppy=2-(对甲苯基)吡啶,dtbbpy=4,4′-二叔丁基-2,2′-联吡啶).其结构通过元素分析、核磁共振谱、质谱、红外光谱进行了表征,并测试了单晶结构.研究了其光物理性能,同时考察了它的热稳定性.结果表明,配合物为单斜晶系、P121/c1空间群;它在二氯甲烷溶液中为黄绿光发射,最大发射波长为566 nm.     

N,N-二(4-(6-2,2′-联吡啶)-苯甲基)-2-(氨甲基)吡啶的合成、结构和光谱性质

合成了一种多齿配体N,N-二(4-(6-2,2′-联吡啶)-苯甲基)-2-(氨甲基)吡啶(C40H32N6),并用MS,EA,1HNMR进行结构表征,测试了吸收光谱(UV)和荧光光谱(FL).随HBF4,乙酸锌的加入,荧光光谱明显红移;随Cu2+浓度增加吸收峰强度逐渐增加,但发射峰逐渐消失,成为激发态荧光体的猝灭剂.测量并计算了摩尔消光系数和量子产率,并用密度泛函理论计算预测了其稳定的空间构型.     

CF3和CH3取代吡啶吡唑硼配合物的结构和吸收光谱的理论研究

采用密度泛函理论DFT/B3LYP在6-31G水平上研究了CH3和CF3取代吡啶吡唑硼配合物的几何和电子结构,在基态平衡构型的基础上通过含时密度泛函理论TD-DFT计算了其光谱性质.结果表明:氟代甲基吡啶甲基吡唑硼配合物(2b′)的配位键略强于甲基吡啶氟代甲基吡唑硼配合物(2b);二者的中心B原子对分子的结构不但起支撑稳定作用,还可以作为电子桥传输电子;当取代基交换位置时,苯环和吡唑环都可以作为空穴传输基团,电子传输基团仍为吡啶环,配合物的主要跃迁都属于配体内部的π→π*跃迁类型.     

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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