水溶性荧光高分子乙烯基咔唑—丙烯酸共聚物的合成及荧光测试

用偶氮二异丁腈作引发剂，使Ｎ－乙烯基咔唑和丙烯酸甲酯在苯中共聚合，该共聚物在四氢呋喃中用氢氧化钠水溶液水解，得到水溶性乙烯基咔唑－丙烯酸共聚物，该共聚物的水溶液在３７３ｎｍ处产生较强的荧光，其荧光强度随液ｐＨ值增大而增强，在该高分子水溶液中，加入不少量阳离子表面活性剂，其量子产率可提高７倍。微量重金属离子（Ｈｇ＾２＾＋）对荧光有一定的熄灭作用。荧光强度（ｌｏｇＩｏ／Ｉ）与Ｈｇ＾２＾＋的浓度呈线性关     

亲水性咔唑共聚物和钼簇合物之间的作用及其溶液荧光

研究了Ｎ－乙烯基咔唑－丙烯酸共聚物（ＮＶＣ－ＡＡ）和微量的钼簇合物「Ｍｏ３Ｏ２（Ｏ２ＣＣＨ３）６（Ｈ２Ｏ）３」Ｂｒ２．２Ｈ２Ｏ在水溶液相互作用及其溶液荧光。实验发现,体系中存在单体荧光（３７５ｎｍ）和二聚体激态缔合物荧光（５００ｎｍ）。荧光强度分别随钼簇合物的浓度啬和ｐＨ值的提高而增强。     

含咔唑高分子水溶液的室温磷光

含咔唑高分子水溶液的室温磷光博日吉汗·格日勒图，印杰（内蒙古师范大学化学系，呼和浩持，０１００２２）（上海交通大学应用化学系）关键词磷光，铊离子，Ｎ－乙烯基咔唑－丙烯酸共聚物芳香族化合物吸收辐射后可在室温发射荧光，但芳香族化合物小分子只有在低温（７７...     

汞代N—乙烯基咔唑—丙烯酸共聚物的合成与研究

制备线型和网状Ｎ－乙烯基咔唑－丙烯酸甲酯共聚物后，用三氟乙酸汞分别在四氢呋喃和二氯甲烷中进行汞化反应，得到相应的线型和网状汞代咔唑共聚物。这些共聚物经ＴＨＦ溶解或溶胀后，用氢氧化钠水溶液水解，得到相应的水溶性线型高分子和吸水性网状高分子，憎水性汞汞代咔唑共聚物在ＴＨＦ中由Ｉ２抽代汞；亲水性汞代咔唑共聚物在水溶液中由ＫＩ３取代汞、汞代咔唑高分子链在不同溶剂中可以产生不同的形态变化。     

几种过渡金属离子与氟哌酸形成配合物的荧光研究

本文报道了抗菌药氟呱酸与过渡金属离子Ｚｎ~（２＋）、Ｃｄ~（２＋）、Ｈｇ~（２＋）形成配合物所产生的荧光光谱，并通过荧光发射光谱的变化研究这些配合物的结构及配位点，同时对其配合物的荧光偏振进行了测试和探讨。     

新荧光试剂3－对甲苯基－5－（2’－羧基苯偶氮）绕丹宁的合成及荧光光度法测定蚕丝制品中痕量铜的研究

本文报道了新荧光试剂３－对甲苯基－５－（２’－羧基苯偶氨）绕丹宁（ＰＭ－ＰＲＡＣＰ）的合成。用元素分析、红外光谱、核磁共振氢谱和质谱确证了其结构，研究了其荧光性质。在ｐＨ５．６时，该试剂与Ｃｕ￣（２＋）形成稳定的荧光螯合物，且在λ＿（ｅｘ）／λ＿（ｅｍ）＝３０５ｎｍ／４０５ｎｍ产生强烈荧光。其荧光强度与Ｃｕ￣（２＋）的浓度在０～１．６μｇ／２５ｍＬ范围内呈线性关系，检测限为５×１０￣（－４）μｇ／ｇ。已用于痕量铜（Ⅱ）的荧光分光光度法测定。测定了蚕茧、蚕丝和丝绸中的痕量铜，结果满意。     

稀土元素荧光增强效应的研究──RE对Eu－2－（2－二苯乙酰基）－1，3－茚二酮－十六烷基三甲基溴化铵体系的荧光增强

研究了稀土元素Ｌａ~（３＋）、Ｇｄ~（３＋）、Ｙｂ~（３＋）、Ｌｕ~（３＋）、Ｙ~（３＋）及Ｓｃ~（３＋）对Ｅｕ－２－（２－二苯乙酰基）－１，３－茚二酮－阳离子表面活性剂体系的荧光增强效应，结果表明，在上述增强离子存在下，体系的荧光强度分别增加１０、１３０、３０、５０、５２和２０倍，利用标准加入法测定了混合稀土氧化物中的铕，铕浓度在１．０×１０~（－１０）～６．０×１０~（－７）ｍｏｌ／Ｌ范围内与荧光强度呈线性关系，最低检出限为６．０×１０~（－１２）ｍｏｌ／Ｌ。     

2,4—二甲氧基苯基荧光酮荧光熄灭法测定痕量钨

１引言荧光光度法测定钨所用的荧光酮类试剂有：二溴羟基苯基荧光酮、５’－硝基水杨基荧光酮、水杨基荧光酮等．２，４－二甲氧基苯基荧光酮（ＤＭＰＦ）自合成以来，已应用于荧光熄灭法测定钛、铁等．作者详细地研究了在混合表面活性剂（ＣＴＭＡＢ＋ＯＰ－１０）协同增敏作用下，钨与２，４－二甲氧基苯基荧光酮的荧光熄灭体系．该法显色迅速，荧光强度稳定，线性范围宽．在混合掩蔽剂ＥＤＴＡ和盐酸羟胺存在下，测定合金钢中的钨，结果满意。２实验部分２．对主要仪器与试剂９３０型荧光光度计；钨标准溶液（ｌ．００ｍｇ／Ｌ）；２，４…     

含苯环亲水共聚物形态及溶液荧光

研究含芳环（生色团）的亲水性高分子对于了解高分子结构和性质之间的关系，开发新型发光材料很有意义[1.2]．前文[3.4]借报道了N-乙烯基咋冷丙烯酸共聚物（NVC－AA）的合成及发光性能研究，本文报道含苯环亲水高分子苯乙烯一丙烯酸共聚物（ST－AA）的微观结构与荧光特性?..     

N-乙烯基咔唑标记甲基丙烯酸-苊烯共聚物的荧光特性

合成了苊烯(ACE)含量依次为4.3、7.5、15.1及20.8 mol％的N 乙烯基咔唑(NVCz)标记甲基丙烯酸(MAA) 苊烯共聚物(PMAA ACE/NVCz）和ACE含量仅为0.5 mol％的ACE MAA共聚物（PMAA ACE）,研究了各共聚物在稀水溶液中的荧光行为和pH、表面活性剂等对共聚物荧光特性的影响.实验发现:在酸性介质中共聚物的压缩线团构象使激发态缔合物荧光相对增强,ACE到NVCz能量转移效率增加;碱性介质中共聚物构象相对松散,ACE到NVCz能量转移效率降低,因此荧光光谱中NVCz特征几乎消失.阴离子表面活性剂十二烷基磺酸钠(SDS),阳离子表面活性剂十六烷基三甲基溴化铵(AHTB)以及中性表面活性剂吐温80的引入使共聚物在酸性介质中的单体荧光特征增强,ACE到NVCz的能量转移效率下降;在碱性介质中引入AHTB部分中和了共聚物链上的负电荷,使共聚物构象重新卷曲,ACE到NVCz的能量转移效率提高,荧光光谱中NVCz特征重新出现,ACE单体荧光特征相应减少;在碱性介质中引入SDS以及吐温80对共聚物荧光光谱影响不大.     

汞离子的高灵敏度裸眼识别和荧光传感探针

设计合成了一种以耐尔蓝为母体的Hg2+光学探针分子1-苯甲酰-3-{2-[9-(乙氨基)-10-甲基-9H-苯并[α]苯酚-5-胺基]乙基}硫脲盐酸盐(NBET). 在pH=7.4的Tris-HCl缓冲液中, 探针分子最大吸收波长为640 nm, 此时溶液为淡蓝色; 加入汞离子可以诱导探针分子在640 nm处的吸收降低, 并在556 nm处产生新的吸收峰, 溶液变为浅紫色, 而其它金属离子的加入未引起显著变化, 基于此可对水溶液中的痕量Hg2+进行裸眼识别. 荧光光谱显示, 汞离子可以特异性地猝灭探针分子在660 nm处的荧光发射. 该探针分子的灵敏度、选择性及荧光量子产率高, 激发/发射波长长, 可以实现水溶液中0.005 μmol/L Hg2+的荧光检测.     

含铕荧光两亲接枝共聚物的制备及胶束化行为

以丙烯酸(AA)、 苯甲酸(BA)和邻菲啰啉(Phen)为配体, Eu³⁺为中心离子, 制备了可聚合荧光配合物单体, 并以此单体为功能单体, 聚乙二醇单甲醚甲基丙烯酸酯(MPEGMA)和甲基丙烯酸六氟丁酯(HFMA)为共聚单体, 通过溶液聚合制备出含铕两亲荧光接枝共聚物P-[HFMA-co-Eu(AA)(BA)₂Phen]g-PEG. 利用红外光谱(FTIR)和核磁共振波谱(¹H NMR和¹⁹F NMR)对共聚物的结构进行表征; 采用表面张力法测定共聚物的临界胶束浓度(cmc)为0.20 g/L; 通过透射电子显微镜(TEM)和动态光散射仪(DLS)观察胶束的形貌及其胶束化行为, 发现该共聚物可以形成大小均一的球形胶束, 且随着共聚物浓度的提高, 胶束粒径相应增大; 在溶液浓度达到临界胶束浓度时, 溶液荧光出现强度突变.     

Functionalized CdS quantum dots-based luminescence probe for detection of heavy and transition metal ions in aqueous solution

Strong luminescence CdS quantum dots (QDs) have been prepared and modified with l-cysteine by a facile seeds-assistant technique in water. They are water-soluble and highly stable in aqueous solution. CdS QDs evaluated as a luminescence probe for heavy and transition metal (HTM) ions in aqueous solution was systematically studied. Five HTM ions such as silver(I) ion, copper(II) ion, mercury(II) ion, cobalt(II) ion, and nickel(II) ion significantly influence the photophysics of the emission from the functionalized CdS QDs. Experiment results showed that the fluorescence emission from CdS QDs was enhanced significantly by silver ion without any spectral shift, while several other bivalent HTM ions, such as Hg(2+), Cu(2+), Co(2+), and Ni(2+), exhibited effective optical quenching effect on QDs. Moreover, an obvious red-shift of emission band was observed in the quenching of CdS QDs for Hg(2+) and Cu(2+) ions. Under the optimal conditions, the response was linearly proportional to the concentration of Ag(+) ion ranging from 1.25 x 10(-7) to 5.0 x 10(-6)molL(-1) with a detection limit of 2.0 x 10(-8)molL(-1). The concentration dependence of the quenching effect on functionalized QDs for the other four HTM ions could be well described by typical Stern-Volmer equation, with the linear response of CdS QDs emission proportional to the concentration ranging from 1.50 x 10(-8) to 7.50 x 10(-7)molL(-1) for Hg(2+) ion, 3.0 x 10(-7) to 1.0 x 10(-5)molL(-1) for Ni(2+) ion, 4.59 x 10(-8) to 2.295 x 10(-6)molL(-1) for Cu(2+) ion, and 1.20 x 10(-7) to 6.0 x 10(-6)molL(-1) Co(2+) ion, respectively. Based on the distinct optical properties of CdS QDs system with the five HTM ions, and the relatively wide linear range and rapid response to HTM ions, CdS QDs can be developed as a potential identified luminescence probe for familiar HTM ions detection in aqueous solution.     

Photophysical and viscometric properties of naphthalene-labeled acrylamide/N,N-dimethyl maleimido propyl ammonium propane sulfonate copolymer

 The synthesis, viscometric, and fluorescence properties of a water-soluble zwitterionic sulfobetaine copolymer, poly(ADMMAPS)/NA, are reported. When fluorescent hydrophobes (naphthyl group) are incorporated into the zwitterionic copolymer, the photophysical response may effectively probe solution behavior on the microscopic level. Experimental results indicate that I _E/I _M steadily increases with increases in polymer concentration. I _E/I _M in aqueous solution is greater than that in aqueous potassium chloride solution. Dynamic light scattering (QELS) measurements show that hydrodynamic diameters of the naphthalene-labeled zwitterionic sulfobetaine copolymer increase with an increasing salt concentration. Viscosity studies reveal that the polymer coil expanded as more salt is added. In fluorescence quenching study, the reduction in the quenching efficiency of Tl⁺ with salt addition can arise from enhanced compartmentalization of naphthalene labels as added electrolyte enhances intrapolymer micellization. The intrapolymer micelle is easily formed, indicating that the thallium ion has difficulty reacting with bound naphthalenes located in the polymer coil. The naphthalene-labeled zwitterionic sulfobetaine copolymer is depicted as a compacted polymer coil conformation in deionized water because of intra-and inter-associations. Consequently, salt addition breaks up the associations and enhances the intrapolymer micellization. The microscopic and macroscopic behaviors of zwitterionic sulfobetaine copolymer differ a lot from those of the corresponding cationic copolymer. Received: 4 February 1997 Accepted: 1 May 1997     

Highly selective, sensitive and quantitative detection of Hg2+ in aqueous medium under broad pH range

Amidothiourea linked acridinedione derivatives selectively detect Hg(2+) in unbuffered aqueous solution under broad pH range with both single- and two-photon excitation. The observed linear fluorescence intensity change allows the quantitative detection of Hg(2+) in the concentration range of 22 nM-0.33 μM with the lower detection limit of 2 nM.     

Studies on the conformational behavior of acenaphthylene-labeled poly(acrylamide-<Emphasis Type="BoldItalic">co</Emphasis>-acryloyl-6-deoxy-6-amino-β-cyclodextrin)

An acenaphthylene (ACE)-labeled, β-cyclodextrin (β-CD)-modified poly(acrylamide) (PAM), (P(AM-co-β-CD)/ACE), was prepared in the present study. The conformational behavior of the ACE-labeled polymer in aqueous solution was studied by employing various fluorescence techniques, including fluorescence anisotropy and fluorescence quenching with different quenchers. It was demonstrated that the copolymer is partially hydrolyzed even though the charge density of the copolymer might be low, and the intra- and intermolecular complexation occurs in the copolymer solution due to the host–guest interaction between β-CD and ACE appended on the polymer backbone. The supramolecular interaction also exists in solid state as confirmed by the studies of the solid samples, which were obtained by freeze–drying the solution samples, by using powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. It is expected that this kind of copolymers may be used as building blocks for the construction of novel supramolecular structures and for the preparation of smart soft solid like stimuli-responsive hydrogels.     

Study on the fluorescence resonance energy transfer between CdTe QDs and butyl-rhodamine B in the presence of CTMAB and its application on the detection of Hg(II)

The thioglycolic acid-functionalized CdTe quantum dots (QDs) were synthesized in aqueous solution using safe and low-cost inorganic salts as precursors. Fluorescence resonance energy transfer (FRET) system was constructed between CdTe QDs (donor) and butyl-rhodamine B (BRB) (acceptor) in the presence of cetyltrimethylammonium bromide (CTMAB). CTMAB micelles formed in water reduced the distance between the donor and the acceptor significantly and thus improved the FRET efficiency, which resulted in an obvious fluorescence enhancement of the acceptor. Several factors which impacted the fluorescence spectra of the FRET system were studied. The energy transfer efficiency (E) and the distance (r) between CdTe and BRB were obtained. The feasibility of the prepared FRET system as fluorescence probe for detecting Hg(II) in aqueous solution was demonstrated. At pH 6.60, a linear relationship could be established between the quenched fluorescence intensity of BRB and the concentration of Hg(II) in the range of 0.0625-2.5mumolL(-1). The limit of detection was 20.3nmolL(-1). The developed method was proved to be sensitive and repeatable to detect Hg(II) in a wide range in aqueous solutions.     

Selective Hg(II) detection in aqueous solution with thiol derivatized fluoresceins

The syntheses and photophysical properties of mercury sensors 2 and 3 (MS2 and MS3), two asymmetrically derivatized fluorescein-based dyes designed for Hg(II) detection, are described. These sensors each contain a single pyridyl-amine-thiol metal-binding moiety, form 1:1 complexes with Hg(II), and exhibit selectivity for Hg(II) over other Group 12 metals, alkali and alkaline earth metals, and most divalent first-row transition metals. Both dyes display superior brightness (Phi x epsilon) and fluorescence enhancement following Hg(II) coordination in aqueous solution. At neutral pH, the fluorescence turn-on derives from greater brightness due to increased molar absorptivity. At higher pH, photoinduced electron transfer quenching of the free dye is enhanced, and the Hg(II)-induced turn-on also benefits from alleviation of this pathway. MS2 can detect ppb levels of Hg(II) in aqueous solution, demonstrating its ability to identify environmentally relevant concentrations of Hg(II).     

Ratiometric determination of Hg2+ ions based on simple molecular motifs of pyrene and dioxaoctanediamide

A new podand-type dioxaoctanediamide-based chemosensor having two pyrene moieties was prepared, and its fluoroionophoric behaviors toward transition-metal ions were investigated. Pyrene-appended dioxaoctanediamide 1 showed a selective fluorescence quenching toward Hg2+ ions over other transition-metal ions in an aqueous methanol solution. Unique responses in pyrene monomer and excimer emissions allowed selective ratiometric determination of Hg2+ ions in aqueous environments, and the detection limit was found to be 1.6 x 10(-6) M. [structure: see text]     

Can Hg(II) be Determined via Quenching of the Emission of Green Fluorescent Protein from <Emphasis Type="Italic">Anemonia sulcata</Emphasis> var. <Emphasis Type="Italic">smaragdina</Emphasis>?

Anemonia sulcata var. smaragdina is a widely distributed Cnidarian species along Turkish coastlines. It is also a well-known example of a facultative symbiotic life form in sea ecosystems. Green fluorescent proteins (GFPs) in Anemonia sulcata var. smaragdina have vital roles in this symbiotic form. The fluorescence quenching by Hg(II) in the supernatants obtained from A. sulcata var. smaragdina was shown in this study. According to results, there was a statistical significant relationship (R ² = 0.9913) between increased Hg(II) concentration and decreased fluorescence intensity of GFP supernatants obtained from A. sulcata var. smaragdina. Mn(II), Fe(II), and Al(II) showed no interference effect and did not change the fluorescence intensity of GFP supernatants obtained from A. sulcata var. smaragdina. In conclusion, the fluorescence quenching of GFPs by Hg(II) can be a novel method to determine the Hg(II) levels in aqueous solution. Therefore, further researches are strongly warranted because of the possible potential applications of the fluorescence quenching of GFPs by Hg(II).