金属卟啉在不同溶剂中紫外可见吸收光谱的研究

以环己烷作为中性参比溶剂，采用Cary50紫外可见分光光度计研究了氧钒—2，3，7，8，12，13，17，18-八乙基卟啉(VPPEP)和镍-2，3，7，8，12，13，17，18—八乙基卟啉(NiOEP)在不同溶剂中的紫外可见吸收光谱。结果发现，两种金属卟啉可以与一些Lewis碱性溶剂发生轴向配位作用，形成轴向加合物，加合物的紫外可见吸收光谱红移，α和β吸收带的相对吸收强度比减小；金属卟啉和Lewis碱性溶剂之间的轴向配位作用受溶剂碱性和立体构造的影响，碱性强、立体阻碍小的Lewis碱性溶剂(如正丁胺)易于与金属卟啉发生轴向配位反应，VOOEP/正丁胺体系的等吸收点在412，539，578mn处，NiOEP／正丁胺体系的等吸收点在408，527，568mn处。     

两亲卟啉在Triton X-100胶束中的紫外可见光谱研究

利用紫外可见光谱研究了两亲的对一四羟基苯基卟啉(THPP)在非离子表面活性剂聚氧乙烯基醚(Triton X-100)胶束中的光谱行为，随着体系pH的增加，THPP的Soret带从424nm红移至439nm，四个Q带(520nm，561nm，595nm，653nm)消失而在580nm和667nnm处产生两个与金属卟啉的吸收光谱极为相似的新峰，这一现象说明卟啉发生了去质子化，在pH7．54时，其光谱类似于在THF溶剂中，而在pH12．46时，其光谱又类似于强碱水溶液，由此可知，可以通过改变体系pH来控制卟啉环在胶束中的增溶位置从而实现卟啉的跨膜转移。     

卟啉和金属卟啉光学非线性吸收的溶剂影响

利用波长为532 nm纳秒脉冲激光的z扫描测量装置对四苯基卟啉(TPP)、四苯基卟啉铜(CuTPP)、四苯基卟啉锌(ZnTPP)和四苯基卟啉镍(NiTPP)在氯仿和吡啶溶剂中的非线性吸收进行了测量,采用五能级模型对实验结果进行了分析,获得了在不同溶剂中的基态吸收截面、激发态吸收截面和系间窜跃时间.结果显示,溶剂的变化导致材料基态吸收光谱改变的同时,也影响材料的非线性吸收参数.通过对三种金属四苯基卟啉比较发现,不同的金属卟啉在氯仿和吡啶溶剂中非线性吸收的表现也不相同.溶剂对卟啉和金属卟啉的光学非线性有着较大的影响.     

对位取代金属卟啉的合成及其催化氧化对甲基异丙苯的初步研究

用混合溶剂方法,合成了5种对位取代的四苯基卟啉配体,收率范围为23%~52%,对卟啉配体进行轴向金属化反应得到含有中心金属离子(铁、钴、锰)及轴向氯配位的一系列金属卟啉化合物(金属化收率为90%~98%),并用红外光谱、紫外-可见光谱及核磁氢谱对所合成的卟啉化合物进行了结构表征.首次研究了金属卟啉催化分子氧在无溶剂绿色条件下氧化对甲基异丙苯.结果表明:对甲氧基四苯基卟啉和对氯四苯基卟啉的两价钴配合物的催化氧化活性较强.     

卟啉-脂质体化合物P-GlyL的紫外可见及荧光光谱性质研究

以溴代肽脂质BrC5Gly2C16与5,10,15-三苯基-20-对羟基苯基卟啉（HPTPP）为原料,合成一种可用作新型分子器件的卟啉-脂质体化合物P-GlyL。 采用元素分析、紫外可见光谱、红外光谱以及核磁共振等进行表征。 并对该化合物在不同浓度的金属离子Zn2+溶液中的紫外可见光谱和荧光光谱进行了研究。 结果表明,当加入Zn2+之后,形成的金属卟啉化合物荧光强度在650.0nm处下降,而在437.0nm和595.8nm处产生新的荧光发射峰,且荧光强度随着Zn2+浓度增加而增强,而同时349.0nm和698.5nm处的发射峰发生了0.5nm的红移且荧光强度增强。     

氨基酸系列水杨醛希夫碱与四苯基卟啉结合金属离子能力之比较

合成了甘氨酸(Gly-Schiff base)、L-苯丙氨酸(L-Phe-Schiff base)及L-天冬氨酸(L-Asp-Schiff base)3种氨基酸水杨醛希夫碱(AAS)及其4种金属离子Cu2 、Fe2 、Ni2 、Zn2 配合物(MAAS),将四苯基卟啉(TPP)直接加入MAAS的氯仿溶液中,研究其紫外-可见电子吸收光谱.分析了卟啉作为信号转导体系中信号传递中间介质,实现人工细胞信号转导体系中信号传递的可能性.表明Cu2 、Ni2 能够在常温常压下被卟啉从希夫碱上夺取下来,形成金属卟啉配合物.这说明在文中所构建的人工细胞信号转导体系中,加入卟啉分子可以将信号分子Cu2 进行下一步的传递.     

鸡蛋白四苯基钴卟啉催化氧气氧化乙醇

鸡蛋白中的转铁蛋白具有清除过氧自由离子的功能.为了考察这些蛋白质在金属卟啉催化剂催化氧化反应中是否有增效作用,用鸡蛋白固载金属卟啉制备了鸡蛋白四苯基钴卟啉固体催化剂,研究其催化氧化乙醇选择性生成乙醛和乙酸的能力,考察反应时间、温度和压力对其催化性能的影响,并用紫外可见光谱( UV-Vis)及傅立叶红外吸收光谱(FT-I...     

紫外可见光谱协助快速纯化卟啉及金属卟啉的光催化取代基效应

以丙酸为溶剂,吡咯与4-取代苯甲醛反应合成5,10,15,20-四(4-取代苯基)卟啉.根据卟啉Soret带和Q带的特点,用紫外可见光谱协助监测柱层析中满足特征谱带的流出组份,快速分离纯化卟啉.以5,10,15,20-四(4-甲氧羰基苯基)卟啉为配体,与不同金属离子反应得到金属卟啉,对其进行可见光降解有机污染物罗丹明B...     

脂肪取代基卟啉的合成及其L-B膜

合成了两种脂肪基卟啉及以Co2+,Zn2+为中心离子的金属卟啉。用红外光谱、紫外可见光谱和元素分析进行了表征。将上述六种卟啉制成L-B膜,并测定了膜的性质。     

基于阴离子诱导吲哚醌基比色传感器光学输出信号的分子逻辑门构建

为了拓展分子逻辑器件中的阴离子识别体系,以较少用于阴离子受体设计的吲哚醌为信号报告单元,设计合成了基于质子转移的新型阴离子受体Host,分别测试在F~-、Cl~-、Br~-、I~-、HSO_4~-、H_2PO_4~-、NO_3~-和AcO-等阴离子的作用下,主体化合物Host紫外-可见吸收光谱的变化.结果表明,主体化合物Host在412 nm处有最大吸收,加入F~-、AcO~-和H_2PO_4~-后,最大吸收发生明显红移,在448 nm处产生新的吸收峰,其他阴离子未引起Host的此种变化,即它能够特异性地识别F~-、AcO~-和H_2PO_4~-.在此基础上,以F~-、AcO~-、H_2PO_4~-和HSO_4~-为输入信号,以Host在412 nm和448 nm处的吸收为输出信号,基于阴离子‘输入’诱导Host紫外-可见吸收光谱的变化,结合布尔逻辑规则,分别构建了OR、NOR及互补的INH/IMP分子逻辑门.     

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     

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