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基于芘的荧光熄灭的单质碘荧光敏感膜的研究 总被引:8,自引:0,他引:8
单质碘熄灭固定于增塑的PVC膜中的芘的荧光,且这种熄灭作用可逆。本据此研制了用于测定单质碘浓度的荧光敏感膜,最佳膜组成为2~4mg芘、50mgPVC粉、100mg邻苯二甲酸二异辛酯,测定碘的浓度范围为2.26×10^-5~1.04×10^-3mol/L。此膜测定单质碘的重现性好,响应时间小于40s。除Fe^3+、Bi^3+外,其它常见离子均无干扰。将此膜用于食盐中碘的测定,结果令人满意。 相似文献
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罗宗铭 《理化检验(化学分册)》1997,33(5):231-233
铍是常见的合金元素之一,它可使合金的抗氧化、抗腐蚀及耐磨作用增强.同时,铍在原子能工业,电子工业及航天器材等方面也都有应用,因而铍的各种分析检测方法受到工业与环保等部门的重视.荧光光度法具有灵敏度高,设备与操作简便等特点,更受分析工作者关注.近10年来,铍的荧光分析有了一些新进展,研究了一些新试剂、新体系及新技 相似文献
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荧光团杂化纳米SiO2微球作为生物标记探针的应用研究 总被引:4,自引:0,他引:4
近年来 ,无机发光量子点[1,2 ] 、荧光纳米乳液微球[3 ,4 ] 及发光团掺杂 Si O2 纳米粒子[5] 等纳米荧光探针的出现 ,为生物标记提供了新的发展领域 .将有机染料以共价方式包埋在 Si O2 中所得的复合材料具有独特的光学性质 ,然而其在生物标记方面的应用并未得到重视[6 ,7] .本实验通过控制荧光团修饰的硅烷前体在反相胶束体系中的水解缩合 ,合成了用于生物染色和诊断的高灵敏度、高稳定性的新型荧光团杂化纳米 Si O2 微球 ( NFHS微球 ) .在 NFHS微球中 ,荧光团以共价方式地均匀分散在 Si O2 网络结构中 ,避免了与外界体系中溶解氧的… 相似文献
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荧光酮类试剂的结构与荧光性能关系的研究 总被引:1,自引:0,他引:1
研究了苯基荧光酮,水杨基荧光酮,二甲氨基苯基荧光酮及其溴取代衍生物的荧光性能与结构的关系,试验表明,在分子中9-取代苯的间位(3’或5’位)上引入溴取代基后,激发及发射波长较相应未溴化的试剂均有红移,斯托克位移增大,分析性能有所致善,比较了六种试剂荧光猝灭法测定Zr(Ⅳ)和Al(Ⅲ)的条件,建立了相应的测定方法。 相似文献
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酪氨酸的分频荧光光谱研究 总被引:1,自引:0,他引:1
酪氨酸在300nm处产生一个荧光峰,在600nm处产生一个1/2分频荧光峰,在900nm处产生一个1/3分频荧光峰,此三峰具有相似的荧光特性。根据非线性光学分频荧光原理探讨了酪氨酸分频荧光峰产生的原因。 相似文献
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荧光各向异性法快速测定荧光标记物对蛋白质的标记比 总被引:1,自引:0,他引:1
免疫荧光技术是免疫学检测的重要手段之一,该技术在病原微生物的早期诊断、自身免疫研究、抗原或抗体的免疫组化定位等方面都得到了广泛应用[1].荧光色素对抗体(或抗原)标记比的测定是免疫荧光技术的重要部分. 相似文献
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设计合成了1-乙酰基-3-(2-羟基-4,6-二甲氧基苯基)-5-苯基-2-吡唑啉(4), 测试了其紫外光谱和荧光光谱, 研究了其对锌离子的选择性识别作用. 结果表明, 化合物4作为锌离子荧光探针, 受常见离子的干扰较小, 对于锌离子有着较高的选择性和较低的检出限. 相似文献
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[graph: see text] 8-Hydroxyquinoline benzoates were developed as a new set of 8-HQ derivatives for highly sensitive fluorescent chemosensors for transition metal ions. A prominent fluorescence enhancement was found in the presence of transition metal ions such as Hg2+ and Cu2+, and this was suggested to result from the suppression of radiationless transitions from the npi state in the chemosensors. 相似文献
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Oliveira E Nuñez C Rodríguez-González B Capelo JL Lodeiro C 《Inorganic chemistry》2011,50(18):8797-8807
Emissive molecular probes based on amino acid moieties are very appealing because of their application as new building blocks in peptide synthesis. Two new bioinspired coumarin probes (L1 and L2) were synthesized and fully characterized by elemental analysis, infrared, (1)H NMR, (13)C NMR, UV-vis absorption and emission spectroscopy, matrix-assisted laser desorption-ionization time-of-flight mass spectrometry (MALDI-TOF-MS), lifetime measurements, and X-ray crystal diffraction. Their sensing ability toward alkaline earth, transition, and post-transition metal ions (Ca(2+), Zn(2+), Cd(2+), Cu(2+), Ni(2+), Hg(2+), Ag(+), and Al(3+)) and their acid-base behavior (H(+), OH(-)) were explored in absolute ethanol by absorption and fluorescence spectroscopy. Compound L1 shows a strong complexation constant with the soft metal ions Zn(2+), Cd(2+), and Ag(+). Compound L2 shows a high fluorescence quantum yield, and it could be used as a non-pH-dependent fluorescent biological probe. Very small gold nanoparticles (AuNPs) using compounds L1 and L2 as stabilizers were obtained by using a reductive method and were characterized by UV-vis, light scattering, and transmission electron microscopy (TEM). Dynamic light scattering and TEM studies show that the formation of small nanoparticles is around 4.27 ± 0.64 nm for L1 and around 2.69 ± 0.96 nm for L2. The new stable Cou@AuNPs behaved as supramolecular chemosensors, which have been selective for the heavy element Hg(2+), with a concomitant change of color from pink to dark red/brown and an increase of size up to 100-fold. 相似文献
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R. Todd Bronson Luca Prodi Nelsi Zaccheroni N. Kent Dalley Jerald S. Bradshaw 《Tetrahedron》2004,60(49):11139-11144
Derivatives of 8-hydroxyquinoline were used as model compounds to probe the pathways of non-radiative relaxation of fluorophores in two fluorescent chemosensors. Results suggest that both photo-induced proton transfer and photo-induced electron transfer contribute to quenching the fluorescence of the chemosensors. Crystal structures of an 8-hydroxyquinoline-containing chemosensor complexed to various metal ions indicate that a proton shift occurs concomitant with complex formation. This proton shift precludes both photo-induced proton and electron transfer allowing fluorescence emission from chemosensor-metal ion complexes. 相似文献
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设计合成了6个1-乙酰基-3-(2-羟基-4,6二甲氧基苯基)-5-芳基-2-吡唑啉化合物4a~4f.测试了它们的紫外光谱和荧光光谱,研究了其对铜离子的选择性识别作用.结果表明,化合物4f作为铜离子荧光探针,受常见离子干扰较小,对于铜离子有着较高的选择性和较低的检出限. 相似文献
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合成了一系列具有C3v对称性、下缘分别利用Se、Te和S杂原子连接蒽环发光基团的杯[6]芳烃衍生物1-3.通过紫外-可见光谱和荧光光谱研究了它们对各种碱金属离子和过渡态金属离子的化学传感识别行为. 结果表明,含有Se杂原子的主体1在CH2Cl2溶液中对Hg2+表现出良好的选择性. 并且,通过肉眼可以直接观察到溶液颜色由无色变为黄色.通过荧光光谱的连续滴定实验,主体1-Hg2+体系的稳定常数可达(1.12 ? 0.08) ? 105 M-1. 因此,化合物1有望成为一种用于检测Hg2+的新型化学传感器. 相似文献
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Arduini M Marcuz S Montolli M Rampazzo E Mancin F Gross S Armelao L Tecilla P Tonellato U 《Langmuir : the ACS journal of surfaces and colloids》2005,21(20):9314-9321
There is great interest in the self-organization of the proper subunits as a new strategy for the realization of fluorescent chemosensors. In this article, it is shown that commercially available fluorescent dyes, functionalized with triethoxysilane moieties, can be converted into fluorescent chemosensors by simple inclusion into silica nanostructures. Dye-doped silica nanoparticles and thin films detect Cu(II) ions in the micromolar range by the quenching of fluorescence emission. The different response toward Zn(II), Ni(II), and Co(II) metal ions was also investigated and is reported. The self-organization of the silica structures leads, at the same time, to the formation of metal ion binding sites as well as to the linking of a fluorescent reporter in their proximity. Structural features of the materials, particularly particle size and network porosity, strongly affect their ability to act as fluorescent sensors. 相似文献
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Rhodamine-based chemosensors 1 and 2 were synthesized and self-assembled onto glass surfaces for the selective fluorescent sensing of Pb(2+). The immobilized chemosensors showed fluorescent responses that were turned-on with Pb(2+) in CH(3)CN, selectively over various metal ions. The Pb(2+)-selective fluorescent switch of the immobilized chemosensors was also reversible, allowing for repeated use for Pb(2+) detection. 相似文献
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Yi Chen Kan‐Yi Pu Qu‐Li Fan Xiao‐Ying Qi Yan‐Qin Huang Xiao‐Mei Lu Wei Huang 《Journal of polymer science. Part A, Polymer chemistry》2009,47(19):5057-5067
Three sulfonato‐containing fluorene‐based anionic water‐soluble conjugated polymers, which are specially designed to link fluorene with alternating moieties such as bipyridine ( P1 ), pyridine ( P2 ), and benzene ( P3 ) have been synthesized via the Pd‐catalyzed Sonogashira‐coupling reaction, respectively. These polymers had good solubility in water and showed different responses for transition metal ions with different valence in aqueous environments: the fluorescence of bipyridine‐containing P1 can be completely quenched by addition of all transition metal ions selected and showed a good selectivity for Ni2+; the pyridine‐containing P2 had a little response for monovalent and divalent metal ions while showed good quenching with the addition of trivalent metal ions (with a special selectivity for Fe3+); P3 had responses only for the trivalent metal ions within the ionic concentration we studied. After investigation of the UV‐vis absorption spectra, PL emission spectra, DLS, and fluorescence lifetime of P1 – P3 in aqueous solution when adding transition metal ions, we found that the different spectrum responses of these polymers are attributed to the different coordination ability of the units linked with fluorene in the main chain. The energy or electron‐transfer reactions were the main reason for fluorescence quenching of P1 and P2 . On the other hand, interchain aggregation caused by trivalent metal ions lead to fluorescence quenching for P3 and also caused partly fluorescence quenching of P1 and P2 . These results revealed the origin of ionochromic effects of these polymers and suggested the potential application for these polymers as novel chemosensors with higher sensing sensitivity in aqueous environments. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 5057–5067, 2009 相似文献
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Balasubramanian Mariammal Adaikalam Shylaja Sundaravel Vivek Kumar Stephen Raja Rubina Raju Ranjith Kumar 《Journal of heterocyclic chemistry》2020,57(11):3882-3889
3-Amino-5-(thiazol-2-yl)-[1,1′-biaryl]-2,4-dicarbonitriles have been synthesized employing a facile one-pot pseudo four-component domino strategy. All these thiazole-tethered biaryls exhibited blue fluorescence under UV lamp. Based on the high relative quantum yield, three compounds namely, 4a , 4d , and 4i , were chosen to explore the metal interference studies. Against several metal ions, these three thiazole-tethered biphenyl probes were found to be effective fluorescent chemosensors for the selective and sensitive detection of Fe3+ ions with a lower detection limit of 0.18, 0.12, and 0.16 μM, respectively. 相似文献