稀土元素共发光效应机理探讨

本文阐述了La~(3 )、Gd~(3 )、Tb~(3 ),Lu~(3 )、Y~(3 )对Eu~(3 )(Sm~(3 ))-β-双酮-Phen-表面活性剂(有机溶剂)体系新的荧光增强效应——稀土元素共发光效应的特点,并在实验的基础上探讨这种共发光效应的机理。结果表明,La~(3 )、Gd~(3 )、Tb~(3 )、Lu~(3 )、Y~(3 )与该体系并未生成新的多核化合物。体系中β-双酮分子的三重态能级与La~(3 )、Gd~(3 )、Tb~(3 )、Lu~(3 )、Y~(3 )和能量授体Eu~(3 )、Sm~(3 )激发态能级之间良好匹配,以及水相聚集态和胶束中固溶体的存在是发生稀土共发光效应所必须具备的条件。     

磁场效应下分子发光行为的研究：Ⅱ.磁场效应—偏振—共振同步荧光法

本文叙述了新建立的磁场效应－偏振－共振同步荧光法。利用偏振技术抑制掉溶剂散射光的９９％，利用ＭＦＥｓ抑制熔剂９８％的散射光波动。将偏振、ＭＦＥｓ技术与共振同步荧光法结合为一体时，其检测限分别为０．０６８ｎｇ／ｍｌ，０．０５ｎｇ／ｍｌ。优于一般的△λ值较小（０－５ｎｍ）的同步荧光法和偏振－同步荧光法。     

铽—钆—均苯四甲酸体系的共发光效应及其分析应用

本提出了以均苯四甲酸为配体的铽的荧光测定法，试验表明：在ｐＨ＝６．０－９．０的缓冲溶液中，钆离子能明显增强Ｔｂ＾３＋－均苯四甲酸二元体系的荧光强度。该体系已用于痕量铽的测定，其检出限为４×１０＾－９ｍｏｌ／Ｌ。     

同步辐射在稀土发光材料研究中的应用

介绍了同步辐射用于稀土发材料研究的基本概况，主要包括以下方面：（1）利用同步辐射极宽的光谱分布研究稀土发光的激发谱（35－300nm)和选择激发下的发射谱。（2）利用同步辐射快脉冲光（ps级）研究选择激发下的发光衰减规律，荧光寿命；（3）利用高强度同步辐射X射线研究材料的晶体结构与成分，特别是微结构。以CeF3闪烁体为例说明发射光谱及其衰减规律对激发光波长的强烈依赖：以BaF2:Gd,Eu对例说明获得高效率稀土发光的新途径一“量子剪裁”，以纳米Y2O3：Eu为例，说明发光的尺寸效应与发光中心微结构的关系。     

TritonX—100作用下稀土协同发光测定血清中的茶碱

报道了在表面活性剂ＴｒｉｔｏｎＸ－１００存在下，利用Ｇｄ（Ⅲ）离子增敏Ｃｅ（Ⅳ）和茶碱氧化产物的固有发光的协同效应，建立了高灵敏度的测定茶碱的荧光分析方法，其荧光光谱的激发波长λｅｘ＝３２５ｎｍ发射波长λｃｍ＝４０４ｎｍ。     

一种用于分子发光分析的外加磁场装置

本文介绍了一种自行设计的能将外加磁场效应引入现有分子发光分析仪器的外加磁场装置，讨论了装置的组成、特点和分子发光分析法中的实际应用以及该装置在研究生命科学、生物体系磁效应等方面的潜在意义。     

电化学发光及其应用

对电化学发光作了简要介绍,同时对它的各种应用如定量分析,表面分析,动力学研究,电子转移研究和发光器件应用等作了较为全面的评述。     

修饰石墨电极表面电化学发光反应微环境的研究及其分析应用

用电化学方法对石墨电极表面进行预阳极化修饰后,该修饰电极不但能选择性地使卡托普利富集于修饰电极表面,而且还创造了一个适合于卡托普利显著增敏钌(Ⅱ)联吡啶体系的电化学发光信号的微环境。在优化的实验条件下,该方法的线性范围为2.0×10-8-8.0×10-6g/L,检出限达5.0×10-9g/L。该方法成功应用于尿样的检测。     

发光分析

评述在 2 0 0 1年 1月～ 2 0 0 2年 12月间我国发光分析的发展概况 ,内容包括荧光、磷光、化学发光和电化学发光分析等。引用文献 32 9篇。     

动力学体系中双组份的协同效应研究及其分析应用

用停流ＦＩＡ－分光光度法研究了铬（Ⅵ）－碘化钾动力学反应体系中铁(Ⅱ)和钒(Ⅳ)的协同诱导效应，以协同系数（Ｄ）表示二者相互作用程度的大小，在此基础上提出了一种新的动力学双组份同时测定的方法，本法可扩大前述方法的线性范围，并降低检测限，测定了模拟水样品中铁和钒的含量，结果满意。     

A Study on the Fluorescence System of Sc-BPMPHD-CTMAB and Its Analytical Application

IntroductionThe fluorescence of Sc(3+) itself in solution is not observed. After complexed with an organic ligand with a chromophore, Sc(3+) makes the ligand, which has no or has weak fluorescence, emit strong fluorescence. The fluorescence reagents of Sc~(3+) have been summarized inreferences[1,2], but the derivative of diacylated pyrazolone as a fluorescence reagent of Sc~(3+) hasnot been reported. The experiments indicated that the synthetic derivative of diacylated pyrazolone, 1, 6-bi (1…     

Sensitized Luminescence of Rare Earths

IntroductionAsearlyas1967,inthestudyofthefluorescentcharacteristicsoftheion..associationcomplexEu' -TTA-pyridine,Melentavaetal.[1Jpointedoutthatthef1uorescenceintensityofthesystemwasgreatlyincreasedbytheadditionofGds orTbf' ,andmoreoveronlyinthesuspensiontheenhancementofthefIuo-rescencewasobserved.However,thisphenomenonwasregardedasinterferenceinthepresenceofotherrareearthionsandwaseliminatedbyanextractionpro-cedure.Thisphenomenonwassystemacticallyinvestigatedandcalledcolumines-cence[2j,co…     

毛细管电泳手性分离中的协同效应

综述了毛细管电泳手性分离中的协同效应。介绍了毛细管电泳手性分离中双手性选择剂的应用情况。表明用CDs/CDs.CDs/crown组成的双选择剂及聚合环糊精衍生物,聚合手性胶束体系有可能改善难拆分的对映体物质的分离效果,展示了协同效应的毛细管电泳拆分复杂物质对映体中的应用前景。     

Synergistic Effect of Graphdiyne-based Electrocatalysts

The synergistic effect can help improve the electrocatalyst performances by combining the advantages of individual components. In particular, such an effect has been more important in the atomic catalysts. In this review, we have summarized the synergistic effect of N, X co-doping graphdiyne[X=B, S, F or transition metal(TM)] electrocatalysts and graphdiyne-based dual-atom catalyst(GDY-DAC). In general, the synergistic cooperation between two different dopants in co-doped GDY and adjacent active sites in GDY-DAC not only promotes their catalytic activity but also greatly enhances the thermodynamic stability of the catalysts. For the N, X co-doping GDY electrocatalysts, doping the heteroatoms like boron, sulphur, phosphorus, and fluorine with nitrogen can further tune the charge density distribution and electronic structure. Meanwhile, the electron exchange between two doping atoms and GDY substrate has been discussed, where the TM-based GDY-DAC is a very promising catalyst for electrocatalysis. More importantly, electronic interactions between different elements on GDY have been carefully discussed. In the end, we have also supplied perspectives to the future developments of the GDY-based electrocatalysts.     

聚乙烯亚胺介导siRNA和顺铂协同抗肿瘤治疗

用聚乙烯亚胺(PEI)为载体,介导siRNA(siSurvivin)沉默肿瘤细胞抗凋亡基因survivin,并与抗癌药物(顺铂)进行协同抗肿瘤治疗.凝胶阻滞电泳实验显示,PEI能够对siRNA进行有效复合,在PEI/siRNA质量比为0.4时实现完全阻滞.细胞耐药性实验证明了耐顺铂细胞(A549DDP细胞)的survivin基因过度表达且耐顺铂能力是顺铂敏感细胞(A549细胞)的8倍.RT-PCR实验验证了PEI担载siSurvivin后对survivin基因实现了有效沉默,与顺铂药物共同作用后不影响基因沉默效果.细胞凋亡实验验证了基因与药物协同作用后细胞的凋亡率达到60.9％,而单独药物或PEI/siSurvivin复合物分别作用后的细胞凋亡率仅分别为30.2％和19.8％.细胞增殖实验进一步验证了PEI介导siSurvivin与顺铂联合治疗能够实现有效地协同抗肿瘤效果.     

咪唑啉衍生物与硫脲之间的缓蚀协同效应研究

应用失重法、动电位扫描法、X射线光电子能谱(XPS)研究了咪唑啉缓蚀剂和硫脲复配后对碳钢在CO2盐水溶液中的缓蚀协同作用.实验表明,咪唑啉和硫脲之间存在着良好的协同效应,二者复合后对CO2腐蚀有较好的抑制作用.经XPS检测,试样表面吸附膜有N、S元素存在,而且,于接近基体处,S元素含量相对较高;而在溶液界面处,则N元素含量较高.据此推断缓蚀剂和硫脲在钢样表面可能形成"包含络合物",从而使缓蚀剂膜更加致密,缓蚀效果也更好.     

Crosslink-Enhanced Emission Effect on Luminescence in Polymers: Advances and Perspectives

The crosslink-enhanced emission effect was first proposed to explore the strong luminescence of nonconjugated polymer dots possessing only either non-emissive or weakly emissive sub-luminophores. Interesting phenomena in recent research indicate such enhancement caused by extensive crosslinking appears in diverse luminescent polymers with sub-luminophores (electron-rich heteroatomic moieties) or luminophores (conjugated π domains). This enhancement can promote the emission from nonluminous to luminous, from weakly luminous to strongly luminous, and even convert the pathway of radiative transitions. The concept of the crosslink-enhanced emission effect should be updated and extended to an in-depth spatial effect, such as electron overlap and energy splitting in confined domains by effective crosslinking, more than initial immobilization. This Minireview outlines the development of the crosslink-enhanced emission effect from the perspective of the detailed classification, inherent mechanism and applicable systems. An outlook on the further exploration and application of this theory are also proposed.     

季铵阳离子与无机阴离子对铁的缓蚀协同效应

在酸性介质中,季铵阳离子与无机阴离子对铁具有明显的缓蚀协同效应,阴离子的表面活性越强,对协同效应的贡献越大,阳离子的结构对协同效应同样有着明显的影响。本文采用电化学方法仔细地研究了硫酸溶液中四丁基铵阳离子(TBA~+)和十六烷基吡啶阳离子(HDP~+)与SCN~-及I~-对铁的缓蚀协同效应。