共价有机多孔稀土杂化材料的制备与性能

以结构规整、密度低、热稳定性良好的共价有机多孔骨架（COF-SDU1）为基质,根据配位化学原理,将稀土β-二酮类铕配合物Eu（TTA）₃-Phen引入到该多孔基质中,得到稀土杂化材料（Eu（TTA）₃Phen-@COF-SDU1）。对合成材料的结构进行傅里叶变换红外光谱（FT-IR）,紫外-可见光谱（UV-Vis）和N₂吸附-脱附（BET）分析,结果表明,稀土杂化材料具有与COF-SDU1基质类似的IV型吸附-脱附特征曲线。热重分析表明,COF-SDU1作为良好的基质,能够显著改善稀土配合物的热稳定性。荧光性能分析表明,COF-SDU1基质不影响稀土与配体之间的能量传递。稀土杂化材料的荧光寿命相比于稀土配合物有明显提高。     

N,N,N-三(2-甲基苯并咪唑)胺及其稀土配合物的合成与荧火性质研究

为了考察三脚架配体及其稀土配合物的配位形式和性质,从而为进一步研究其荧光性质、生物活性提供依据,以氨三乙酸为母体合成了N,N,N-三(2-甲基苯并咪唑)胺及其稀土配合物(La3 ,Sm3 ,Y3 ,Tb3 ,Ce3 ,Eu3-).通过红外、核磁共振、差热-热重、紫外及荧光等分析手段研究了配体及其配合物的结构关系和荧光性质.研究表明,该类配体是较好的主体分子,能够与稀土离子发生配位,形成配合物,配合物内界的NO3-以双齿形式与中心离子配位;配合物热稳定性好,具有较好的荧光性质,特别是Tb3 配合物是高效的稀土有机发光配合物,可用于荧光材料的研究.     

一个新颖的双席夫碱配体衍生的双核镝(Ⅲ)配合物:合成、结构和磁性能研究

通过溶剂热方法合成了一个以2-[（2-羟基苯基）亚甲基联二腙]-N''-[（2-羟基苯基）亚甲基]-丙酰腙（H₃L）为配体的稀土镝（III）配合物[Dy₂（CH₃CN）₂（H₂O）₂（HL）₂（Cl）₂]·2CH₃CN,并通过单晶和粉末X-射线衍射、元素分析、红外光谱、热重分析、直流和交流磁化率对其结构和磁学性能进行了全面地表征。结构研究表明,该配合物结晶于单斜P2₁/c空间群,晶胞参数为a=0.78136（2）nm,b=1.81946（6）nm,c=1.63321（5）nm,β=97.365（3）°,V=2.32182（12）nm³,Z=2。在该配合物中,双去质子的HL^2-配体连接两个畸变的双帽三棱柱构型的Dy^III离子形成中心对称的双核结构。该配合物在零场下呈现出单分子磁体行为,其自旋磁矩翻转的有效能垒和指前因子分别为91.7 K和5.04×10^-6 s。     

N，N，N’-三苄基-1，1’-联萘-2，2’-二（杂氧乙酰胺）及稀土配合物的合成、表征和荧光性质

合成了一种不对称舍联萘骨架酰胺类开链冠醚配体N,N,N’-三苄基-1,1’-联萘-2,2’-二（氧杂乙酰胺）（L）及其4种稀土配合物．通过核磁共振氢谱、元素分析、摩尔电导率、红外吸收光谱、差热-热重等分析方法,对配体及配合物组成和结构进行了表征．结果表明,4种稀土配合物组成为RE（pic）3L·2H2O[RE—La（Ⅲ）,Eu（Ⅲ）,Tb（Ⅲ）,Y（Ⅲ）]．推测了该系列配合物的结构,稀土离子配位数为10．在不同溶剂中,对Eu（III）和Tb（Ⅲ）配合物荧光性质进行了研究,发现Eu（Ⅲ）配合物的荧光强度受溶剂效应的影响,荧光强度随溶剂配位能力的增强而减弱．在相同条件下,Eu（Ⅲ）配合物的荧光强度远大于Tb（Ⅲ）配合物,说明配体L的三重态能级与Eu^3＋的激发态能级匹配较好．     

N，N，N-三（2-甲基苯并咪唑）胺及其稀土配合物的合成与荧光性质研究

为了考察三脚架配体及其稀土配合物的配住形式和性质，从而为进一步研究其荧光性质、生物活性提供依据，以氨三乙酸为母体合成了N，N，N-三（2-甲基苯并咪唑）胺及其稀土配合物（La^3＋，Sm^3＋，Y^3＋,Tb^3＋,Ce^3＋，Eu^3＋）．通过红外、核磁共振、差热-热重、紫外及荧光等分析手段研究了配体及其配合物的结构关系和荧光性质．研究表明。谊类配体是较好的主体分子。能够与稀土离子发生配位，形成配合物，配合物内界的NO3^-以双齿形式与中心离子配位；配合物热稳定性好，具有较好的荧光性质，特别是Tb^3＋配合物是高效的稀土有机发光配合物，可用于荧光材料的研究．     

N，N，N’，N’-四苯基-1，1’-联条2，2’-二（氧杂乙酰胺）及稀土配合物的合成、表征和荧光性质

为了研究以1,1’-联萘为骨架的酰胺类开链冠醚配体稀土配合物的组成和荧光性质,合成了N,N,N’,N＇-四苯基-1,1’-联萘-2,2’-二（氧杂乙酰胺）（L）及其5种稀土配合物．通过元素分析、摩尔电导率、红外吸收光谱、紫外吸收光谱、差热-热重分析,对其组成进行了表征．结果表明,5种稀土配合物组成为RE（pic）3L·H2O（RE=La3-,Cd3-,Eu3＋,Tb3＋,Yb3-）．室温下,对该系列配合物的荧光光谱进行了研究,发现只有Eu（Ⅲ）配合物表现出较强的Eu3＋特征发射,说明配体L的三重态能级与Eu3＋的激发态能级匹配较好．同时,测定了Eu（Ⅲ）配合物在不同溶剂中的荧光强度,发现随溶剂配位能力的增强而减弱．     

4,4′-二(1-咪唑基)苯硫醚构筑的镉配合物:合成、晶体结构和性质研究

在水热反应条件下,合成了一个新的镉配合物Cd(BIDPT)₂(NO₃)₂·(H₂O)₂(BIDPT =4,4′-二(1-咪唑基)苯硫醚),经元素分析、红外、热重、单晶衍射表征了化合物.配合物为三斜晶系,P-1空间群,分子量Mr=909.24,a=0.816 4(9) nm,b=1.156 8(1) nm,c=1.179 3(1) nm,α=112.737(1)°,β=107.481(1)°,γ=92.233(2)°,V=0.964 4(2) nm³,Z=1,D_c=1.559 g/cm³,F(000) =458,S =1.074,R₁=0.059 8,ωR₂=0.191 2.配合物中镉离子通过4,4′-二(1-咪唑基)苯硫醚配体桥联成8字型一维链结构.对配合物的热稳定性以及荧光进行了测试,硝基苯化合物对配合物的荧光性质有不同程度的淬灭作用.镉配合物对2,4,6-三硝基苯酚的检测具有很好的灵敏性.     

稀土铕苯甲酸丙烯酸邻菲罗啉四元配合物与苯乙烯共聚物的研究

将具有聚合活性的稀土铕有机配合物Eu3 (BA)2(AA)(phen)与苯乙烯共聚得到一种半透明且发光强度高的稀土高分子光致发光材料,通过凝胶色谱、红外光谱、紫外光谱对其结构进行表征,证实是共聚物,而不是共混掺杂。通过荧光光谱分析说明只要引入少量的稀土配合物单体,共聚物就表现出配合物单体的强紫外吸收特性,并发射出Eu3 的特征荧光。热分析则表明共聚物引入稀土配合物基团后,其热稳定性得到了提高,而稀土配合物键合到大分子链后其结构单元热稳定性也得到相应的提高。     

稀土配合物RE(pic)_3L的合成、荧光性质及与ct-DNA的作用方式

合成了4种N,N-乙基,苯基-N’-苯基-1,1’-联萘-2,2’-二(氧杂乙酰胺)(L)稀土配合物.通过元素分析、红外光谱、紫外光谱、差热-热重和摩尔电导率的分析,确定配合物的组成为RE(pic)3L[RE=La(Ⅲ),Eu(Ⅲ),Tb(Ⅲ),Ce(Ⅲ)],稀土离子的配位数为10,其在CH3OH溶液中属于非电解质.该系列配合物的荧光光谱表明,Eu(Ⅲ)配合物的荧光强度远大于Tb(Ⅲ)配合物,说明配体L的三重态能级与Eu3+的激发态能级匹配较好.通过紫外光谱、荧光光谱和黏度法对配合物与ct-DNA之间的作用方式进行了初步研究,结果表明,配合物与ct-DNA之间存在着插入作用.     

Tb(N-PA)3(TPPO)2配合物的合成及荧光性能

合成了铽、N-苯基邻氨基苯甲酸（N-HPA）和三苯基氧化膦（TPPO）的稀土配合物,采用元素分析、紫外光谱、红外光谱初步进行了结构表征,研究了配合物Tb(N-PA)₃(TPPO)₂的荧光性能.结果表明,铽、N-苯基邻氨基苯甲酸引入第二配体三苯基氧化膦后,敏化了铽离子的发光,配合物的发光强度显著增加,Tb(N-PA)₃(TPPO)₂三元配合物有较好的荧光性.     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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     

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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