共查询到20条相似文献,搜索用时 15 毫秒
1.
A new fluorescein-based chemodosimeter (II) for Hg2+ ion was designed and synthesized, and it displayed excellent selective and sensitive toward Hg2+ ion over other commonly metal ions in aqueous media. II was a colorless, non-fluorescent compound. Upon addition of Hg2+ to the solution of II, the thiosemicarbazide moiety of II would undergo an irreversible desulfurization reaction to form its corresponding oxadiazole (IV), a colorful and fluorescent product. During this process, the spirocyclic ring of II was opened, causing instantaneous development of visible color and strong fluorescence emission in the range of 500-600 nm. Based on the above mechanism, a fluorogenic Hg2+-selective chemodosimeter was developed. The fluorescence increase is linearly with Hg2+ concentration up to 1.0 μmol L−1 with a detection limit of 8.5 × 10−10 mol L−1 (3σ). Compared with the rhodamine-type chemodosimeter, II is more stable in aqueous media and exhibits higher sensitivity toward Hg2+. The findings suggest that II will serve as a practical chemodosimeter for rapid detection of Hg2+ concentrations in realistic media. 相似文献
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A rhodamine-based fluorescent and colorimetric chemodosimeter for the rapid detection of Hg2+ ions in aqueous media 总被引:2,自引:0,他引:2
A rhodamine-based fluorescent and colorimetric chemodosimeter for the rapid detection of Hg2+ ions in aqueous media was developed. The system, which utilizes an irreversible Hg2+-promoted oxadiazole forming reaction, responds instantaneously at room temperature in a 1:1 stoichiometric manner to the amount of Hg2+. The selectivity of this system for Hg2+ over other metal ions is remarkably high, and its sensitivity is below 2 ppb in aqueous solutions. 相似文献
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Chen C Dong H Chen Y Guo L Wang Z Sun JJ Fu N 《Organic & biomolecular chemistry》2011,9(23):8195-8201
A novel chemosensor based on unsymmetrical squaraine dye (USQ-1) for the selective detection of Hg(2+) in aqueous media is described. USQ-1 in combination with metal ions shows dual chromogenic and "turn-on" fluorogenic response selectivity toward Hg(2+) as compared to Li(+), Na(+), K(+), Mg(2+), Ca(2+), Ba(2+), Al(3+), Cu(2+), Cd(2+), Mn(2+), Fe(3+), Ag(+), Pb(2+), Zn(2+), Ni(2+) and Co(2+) due to the Hg(2+)-induced deaggregation of the dye molecule. A recognition mechanism based on the binding mode is proposed based on the absorption and fluorescence changes, (1)H NMR titration experiments, ESI-MS study, and theoretical calculations. 相似文献
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A highly sensitive fluorescent probe 1 for selective detection of Hg ion in mixed N,N-dimethylformamide aqueous media was designed and prepared by incorporating the well-known Rhodamine 6G fluorophore and a carbohydrazone binding unit into one molecule. The fluorescent probe 1 can detect the parts per billion level of HgII in a mixed aqueous environment and displays a highly selective response of fluorescence enhancement toward HgII. 相似文献
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Amita Bist Seung Joo Cho Nisar Ahmed 《Journal of inclusion phenomena and macrocyclic chemistry》2013,77(1-4):75-81
A highly sensitive fluorescent turn-on probe specific for mercury ion has been developed on the basis of mercury ion-promoted hydrolysis of a pyrene-1-carbaldehyde hydrazone (1). The chemical conversion of 1, catalyzed by Hg2+ ions, was studied by using UV, fluorescence and 1H NMR spectroscopy, which clearly showed the conversion of 1 to highly fluorescent compound 1-pyrenecarboxaldehyde (2). 相似文献
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A fluorescent chemodosimeter for cysteine detection was developed based on a tandem conjugate addition and intramolecular cyclization reaction. The method exhibited an excellent selectivity for cysteine over other biothiols such as homocysteine and glutathione. 相似文献
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《Arabian Journal of Chemistry》2020,13(12):8697-8707
A dipodal fluorescent probe 3, with imine and hydroxyl moieties as binding sites, has been synthesized and characterized with spectroscopic methods, single-crystal X-ray techniques, and DFT. The synthesized probe 3 (φ = 0.0028) showed highly sensitive and highly specific fluorescent ‘turn-on’ effect (λem = 453 nm) for the 1:1 binding with Fe3+ ions to form probe 3.Fe3+ complex (φ = 0.203) in semi-aqueous medium (acetonitrile:water (50:50; v/v)) and live cells. The 1:1 binding stoichiometry of probe 3 and Fe3+ ions was proposed by DFT calculations and confirmed by the NMR spectroscopy, crystal structures of probe 3 and 3.Fe3+ complex, and mass spectrum of probe 3.Fe3+ complex. The stability of probe 3.Fe3+ complex in a wide pH range (pH 2–12) and reversibility for binding with Fe3+ ions in the presence of EDTA indicates that it can be an effective chemosensor for the detection of Fe3+ ions in various samples, including living cells. Importantly, with the LOD of 21.5 nM for the detection of Fe3+ ions, probe 3 did not show any interference from potentially competing ions even at a 1:3 ratio, indicates its biocompatibility. The nanomolar limit of detection (21.5 nM), cell permeability, and low cytotoxicity allows the probe 3 to be an excellent tool for the live-cell imaging and detection of ferric ions in live cells. 相似文献
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A highly selective and sensitive fluorescent chemosensor for Hg2+ in neutral buffer aqueous solution 总被引:4,自引:0,他引:4
A selective and sensitive fluorescent chemosensor for Hg2+, which was composed of two aminonaphthalimide fluorophores and a receptor of 2,6-bis(aminomethyl)pyridine, was synthesized through the reaction of 2,6-bis(chloromethyl)pyridine and N-[2-(2-hydroxyethoxy)ethyl]-4-piperazino-1,8-naphthalimide. The chemosensor showed an about 17-fold increase in fluorescence quantum yield upon addition of 1 equiv of Hg2+ in neutral buffer aqueous solution, and the other common metal ions did not notably disturb the detection of Hg2+. 相似文献
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[reaction: see text] N-(Rhodamine-6G)lactam-N'-phenylthiourea-ethylenediamine (1) was developed as a fluorescent and colorimetric chemodosimeter in aqueous solution with a broad pH span (5 approximately 10) and high selectivity toward Hg2+ but no significant response toward other competitive cations, such as Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Pb2+, Cd2+, Ca2+, Mg2+, K+, Na+, etc. The Hg2+-promoted ring opening of spirolactam of the rhodamine moiety induced cyclic guanylation of the thiourea moiety, which resulted in the dual chromo- and fluorogenic observation (OFF-ON). 相似文献
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A highly sensitive chemodosimeter was identified from a panel of rhodamine derivatives for rapid and visual detection of phosgene with a detection limit of 50 nM triphosgene. Visual detection of gaseous phosgene with chemodosimeter absorbed paper strips was demonstrated. 相似文献
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Qiang-Li Wang 《Tetrahedron letters》2009,50(1):29-86
We report herein the first diaminocyclopent-2-enone-based catalytic chemodosimeter (3) for naked-eye and turn-on fluorescent detections of Cu2+ in pure aqueous solution. Compound 3 easily made available from furan-2-carbaldehyde and 2-aminobenzoic acid was found to show a highly selective and sensitive response toward Cu2+ by way of Cu2+-coordination promoted formation of Stenhouse salt and subsequent decomposition to highly fluorescent 2-aminobenzoate. 相似文献
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Xiaohu Ding Feifei Zhang Yinjuan Bai Junxia Zhao Xia Chen Man Ge Wei Sun 《Tetrahedron letters》2017,58(40):3868-3874
Quinoline-based fluorescent probe as a recognition unit was designed and synthesized in this study. The probe R1 displayed excellent selectivity and sensitivity for cadmium ions (Cd2+) over a wide range of metal ions in acetonitrile-water (MeCN-H2O) mixed solution. In order to better understand the recognition mechanism between probe and Cd2+, the density functional theory calculations were performed. Finally, the colorimetric experiment result was observed and conveniently monitored by the naked eye, and a visual detection limit of 4 × 10?6 mol L?1 was achieved. These experimental results indicated the promising potential of the probe to detect Cd2+ in biological system. Furthermore, the probe R1 was successfully used for the highly sensitive detection of Cd2+ in living cells. 相似文献
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Xiang Ming Meng Man Zhou Zhu Qing Xiang Guo 《中国化学快报》2007,18(10):1209-1212
A novel fluorescent Hg~(2 ) chemosensor based on dithia-dioxa-monoaza crown ether was synthesized in four steps from inexpensive starting materials.This new sensor exhibited very strong fluorescence response to Hg~(2 ) (F_(Hg~(2 ))/F_(free)>130) and it was highly selective to Hg~(2 ) over the other metal ions by more than 45-fold. 相似文献
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A series of monostyryl boron dipyrromethenes appended with an NO(4), NO(2)S(2), N(3)O(4), or N(3)O(2)S(2)-type ligand have been prepared and characterised. While the UV-Vis spectra of the former three compounds in CH(3)CN/H(2)O (2?:?3 v/v) do not respond towards a wide range of metal ions, the derivative with an N(3)O(2)S(2)-ligand exhibits a highly selective and sensitive spectral response towards Hg(2+) ions. The absorption band is blue-shifted by 40 nm due to inhibition of the intramolecular charge transfer process upon metal complexation. The fluorescence is also turned on giving a strong emission band at 572 nm. The colour changes can be easily detected by the naked eye. The results suggest that this compound serves as a promising colourimetric and fluorescent sensor for Hg(2+) ions in this mixed aqueous medium. 相似文献
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A novel fluorescent chemodosimeter based on 1,8-naphthyridine exhibits high selectivity to Zn(2+) and Cu(2+). When 1-(7-acetamino-1,8-naphthyridyl)-2-(6-diacetaminopyridyl)ethene was mixed with CuCl2, hydrolysis of the acetamino group catalyzed by Cu(2+) complex was first observed. Resulting from coordination and hydrolysis catalyzed by the corresponding complex of Zn(2+) or Cu(2+), the highly effective fluorescent detection of Zn(2+) and Cu(2+) is realized with Zn(2+)-selective dual-emission and Cu(2+)-selective ON-OFF behavior. 相似文献
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A simple indole-based chemosensor (1) with a very low molecular weight of 207 g mol−1 has been synthesized for the highly reactive and selective detection of CN− in aqueous media, even in the presence of other anions, such as F−, Cl−, Br−, AcO−, S2−, SCN−, NO2−, NO3−, CO3−, BzO−, H2PO4−, and HSO4−. The sensor achieves rapid detection of cyanide anion in 2 min, and the pseudo-first-order rate constant is estimated as 1.576 min−1. The colorimetric and ratiometric fluorescent response of the sensor to CN− is attributable to the addition of CN− to the electron-deficient dicyanovinyl group of 1, which prevents intramolecular charge transfer. The sensing mechanism is supported by density functional theory and time-dependent density functional theory calculations. Moreover, sensor 1 exhibits both high accuracy in determining the concentration of CN− in real samples and 1-based test strips can conveniently detect CN− without any additional equipment. The detection limit of the sensor 1 (1.1 μM) for cyanide is lower than the maximum permissible level of CN− (1.9 μM) in drinking water. 相似文献
19.
Zhao C Feng P Cao J Wang X Yang Y Zhang Y Zhang J Zhang Y 《Organic & biomolecular chemistry》2012,10(15):3104-3109
Here, we report a new Cu(2+)-selective fluorescent turn-on probe BODIPY-EP, in which the 2-pyridinecarboxylic acid is connected to a 6-hydroxyindole-based BODIPY platform through an ester linkage. The ester bond of BODIPY-EP is selectively hydrolyzed by the reaction with Cu(2+) under mild and neutral conditions to generate BODIPY-OH, showing strong characteristic fluorescence of BODIPY-OH. The favorable features of BODIPY-EP towards Cu(2+) include fast response, large fluorescence enhancement and high selectivity. We further demonstrated that the membrane-permeable probe reacts with intracellular Cu(2+) and exhibits bright fluorescence in living cells. 相似文献
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Afolabi T. Adeniyi Ejeromedoghene Onome Olorunlana Gbadebo E. Afolabi T. Adeleke Alli Yakubu A. 《Research on Chemical Intermediates》2022,48(4):1747-1761
Research on Chemical Intermediates - The development of selective, efficient, and economical sensors for the rapid determination of arsenic in an aqueous medium is of paramount importance, due to... 相似文献