含ESIPT染料的光开关多色 荧光聚合物纳米粒子

采用一步细乳液聚合法,将激发态分子内质子转移(ESIPT)荧光染料给体4-甲基苯胺基苯并噻唑(ABT)和4-甲基苯酚基苯并噻唑(HBT)与光致变色受体2-(3′,3′-二甲基-6-硝基螺\[苯并吡喃-2,2′-吲哚啉\]-1′-基)辛基-甲基丙烯酸酯(SP8MA)引入单个聚合物纳米粒子中,合成一系列基于荧光共振能量转移(FRET)的新型光开关多色荧光聚合物纳米粒子.在365 nm紫外光和525 nm可见光的交替照射下,通过选择性发生给受体间的FRET,聚合物纳米粒子表现出多色及可开关调控和可区分的荧光发射信号.该纳米粒子在信息加密、动态防伪等方面有着潜在的利用价值.     

萘酚吡喃-姜黄素光致变色荧光开关分子的合成与性能研究

设计合成了含有萘酚吡喃和姜黄素的光致变色荧光开关分子.在聚甲基丙烯酸甲酯(PMMA)薄膜中基于能量转移机理通过萘酚吡喃的光致变色行为实现了对姜黄素荧光强度的调节,即荧光的"开/关".荧光图像变化进一步证实了萘酚吡喃的光致变色开关环反应能够可逆地调节姜黄素的荧光强度.     

氟罗沙星在胶束体系中的荧光特性研究及应用

目的:研究氟罗沙星在胶束体系中的荧光特性及应用.方法:用日立F-3010型荧光分光光度计测定,测定波长eλx=290 nm,eλm=450 nm,测定时最佳pH值范围为4.5~5.5.在表面活性剂十二烷基硫酸钠(SDS)存在下,由于胶束的生成,使氟罗沙星(FLRX)自身荧光大大增强,据此建立了在SDS胶束体系中测定氟罗沙星的新方法.结果:氟罗沙星浓度在0~0.9μg/mL范围内与荧光强度呈线性关系,相关系数0.9991,检测限为0.01μg.mL-1.加标回收率为97.1%~102.5%,相对标准偏差为1.5%~3.6%.结论:该方法简便,快速,可直接用于药物制剂中氟罗沙星含量的测定.     

荧光可调控的二噻吩乙烯-萘酰亚胺光致变色化合物的合成及性能研究

用Suzuki反应设计并合成了含二噻吩乙烯光致变色单元的萘酰亚胺荧光化合物。所有中间体及目标化合物经核磁(~1H NMR)、质谱(Ms)确证了化学结构,利用紫外-可见光吸收光谱(UV-Vis)、荧光发射光谱,荧光寿命研究了含二噻吩乙烯光致变色单元的萘酰亚胺荧光化合物在溶液中和薄膜中的光致变色性能,结果表明该化合物光致变色前后具有较高的可调控荧光对比度,高的光热稳定性和高的开关环量子产率,在超高密度光存储具有潜在的应用价值。     

距离调控纳米多孔金表面增强荧光特性

通过调控纳米多孔金(NPG)基底与荧光分子之间的距离,系统研究了其表面增强荧光特性.利用物理气相沉积方法在NPG表面沉积二氧化硅薄膜,通过调整二氧化硅的厚度来控制NPG与荧光分子之间的距离,系统研究了NPG孔径尺寸以及与荧光分子之间距离对其表面增强荧光(SEF)特性的影响.由于多孔金具有纳米级多孔结构,其表面等离子体能够通过分子附近局域电场的增强使分子的激发光场得到增强,从而提高分子的激发强度和效率;当荧光分子与多孔金表面存在一定距离时,通过与光子之间的共振耦合作用,表面等离子体能够增强多孔金周围电磁场,实现荧光增强.通过研究发现,NPG孔径为36nm、表面二氧化硅厚度为20nm时,表面组装的罗丹明6G荧光分子的荧光强度得到最大增强.     

间位羟基激发态取代基效应常数的提取

合成了12个模型化合物,3-OH-4’/3’-Y-N-(苯亚甲基)苯胺,经1H NMR和13C NMR进行分子结构表征.测得这些模型化合物在无水乙醇中紫外吸收最大波长λmax(nm).以λmax的能量νmax (cm-1,νmax=1/λmax)代入文献报导的定量相关方程,用计算机进行数据拟合,得到间位羟基(m-OH)的激发态取代基参数σexCC(m)(OH)为0.47.用该值对模型化合物λmax进行计算并与实验值对比,结果表明它是可信的,可用于有机化合物的紫外光谱性能相关和光学材料分子设计.     

1,7-氮杂环取代苝酰亚胺的合成及光学性质

以3,4,9,10-苝四甲酸二酐(PTCDA)为原料,制备了1,7-二溴-N,N'-二丁基-3,4,9,10-苝酰亚胺(PDI-Br_2),通过C-N偶联在1,7-位分别引入四氢吡咯(THP)、六氢吡啶(HHP)和环己亚胺(HMI)氮杂环取代基,合成了1,7-二(四氢吡咯)-N,N'-二丁基-3,4,9,10-苝酰亚胺(PDI-(THP)_2)、1,7-二(六氢吡啶)-N,N'-二丁基-3,4,9,10-苝酰亚胺(PDI-(HHP)_2)和1,7-二(环己亚胺)-N,N'-二丁基-3,4,9,10-苝酰亚胺(PDI-(HMI)_2)。利用~1H NMR,~(13)C NMR和MS进行了结构表征,通过紫外-可见光谱(UV-Vis)和荧光光谱(FL)进行了光学性质研究,采用参比法计算了荧光量子产率。结果表明,在二氯甲烷溶液中,PDI-(THP)_2,PDI-(HHP)_2和PDI-(HMI)_2的最大吸收波长(λ_(max))分别为699,683,708 nm,在λ_(ex)=430 nm激发,最大发射波长(λ_(em))分别为735,753,752 nm,较PDI-Br_2的λ_(max)(523 nm)和λ_(em)(549 nm)均出现了明显红移。PDI-(THP)_2,PDI-(HHP)_2和PDI-(HMI)_2的λ_(max),λ_(em)和Stokes位移(Δλ)受溶剂分子偶极矩的影响较为明显,其荧光量子产率均明显低于PDI-Br_2。     

取代-N-(2-羟基苯亚乙基)苯胺-银纳米超分子体系荧光光谱

为了探索在银纳米粒子(AgNPs)的作用下,取代-N-(2-羟基苯亚乙基)苯胺的荧光性能,本文合成了30个取代-N-(2-羟基苯亚乙基)苯胺模型化合物(MC),并制备了银纳米溶液.以无水乙醇为溶剂,分别测定了MC溶液的荧光光谱以及MC-AgNPs溶液的荧光光谱.结果表明:(1)取代-N-(2-羟基苯亚乙基)苯胺及其与银纳米形成超分子体系在乙醇溶剂中均可发射荧光.与取代-N-(2-羟基苯亚乙基)苯胺溶液的荧光波长相比,取代-N-(2-羟基苯亚乙基)苯胺-银纳米超分子体系的荧光波长均有明显变化,偏移值一般在10 nm以上,有的红移,有的蓝移.(2)大部分取代-N-(2-羟基苯亚乙基)苯胺在银纳米的作用下,其荧光发射强度增加,少部分荧光发射强度降低.(3)如果基团对X-Y相同,相对于取代-N-(2-羟基苯亚甲基)苯胺,一般而言,取代-N-(2-羟基苯亚乙基)苯胺在银纳米作用下的荧光发射波长要长一些.本文观察到的实验现象,对于利用银纳米进行生物检测或有机化合物的检测,具有重要参考价值.     

香草醛缩4-氨基安替比林希夫碱的合成、晶体结构及其荧光性质

合成了香草醛缩4-氨基安替比林希夫碱,通过红外光谱仪、核磁共振仪、元素分析仪和单晶X-衍射仪对产物的结构进行了表征,并对其与几种金属离子作用时的荧光性质进行了分析.结果表明,该希夫碱晶体属单斜晶系,空间群为C-2yc,晶胞参数a=1.179 3 nm,b=1.697 8 nm,c=0.878 0 nm,α=90.00°,β=99.69°,γ=90.00°,V=1.733 nm³,Z=4,D_c=1.262 g/cm3,Z=4,D_c=1.262 g/cm³,μ=0.088 mm3,μ=0.088 mm^(-1),F(000)=693,ρ_(max)=173 e·nm(-1),F(000)=693,ρ_(max)=173 e·nm^(-3),ρ_(min)=-213 e·nm(-3),ρ_(min)=-213 e·nm^(-3).该希夫碱与金属离子作用后,在684 nm(λ_(max))处具有较强的荧光吸收,其中Cd(-3).该希夫碱与金属离子作用后,在684 nm(λ_(max))处具有较强的荧光吸收,其中Cd⁽²⁺⁾、Cu(2+)、Cu⁽²⁺⁾所产生的荧光增强效应显著.     

二芳基硝酮-银纳米超分子体系的紫外光谱

为了探索二芳基硝酮(XPNY)在银纳米粒子(AgNPs)作用下的紫外吸收性能,本文合成了23个XPNY化合物,并制备了AgNPs溶液,在无水乙醇中,测定了XPNY和XPNY-AgNPs溶液的紫外吸收光谱,与文献报导的氮苄叉苯胺-银纳米(XBAY-AgNPs)和N-(苯亚乙基)苯胺-银纳米(XPEAY-AgNPs)体系紫外吸收光谱的变化规律进行比较.结果表明:(1) XPNY-AgNPs与XBAY-AgNPs和XPEAY-AgNPs体系相比,紫外吸收光谱的变化规律不同.(2) XPNY-AgNPs紫外吸收的Δν_(WSL)主要受取代基X和Y的激发态取代基常数,取代基X的场/诱导效应常数,Y的共轭效应常数以及基团X和Y之间的交叉作用项等的共同影响.(3)由于XBAY,XPEAY和XPNY这3类化合物分子中的桥键不同,当它们与银纳米粒子发生作用,紫外吸收光谱受到取代基效应的影响差别较大,XBAY-AgNPs和XPEAY-AgNPs的极限波长λ'_(max,lim)相对于XBAY和XPEAY的λ'_(max)既有红移也有蓝移;而XPNY-AgNPs的λ'_(max,lim)相对于XPNY的λ'_(max)只发生红移.该结果对理解XBAY,XPEAY和XPNY这3类化合物在银纳米作用下的紫外吸收光谱有理论意义,也可为相应化合物-银纳米的紫外吸收光谱的检测应用提供参考.     

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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