共查询到20条相似文献,搜索用时 15 毫秒
1.
Simple structural compounds 1 to 3 were synthesized.The presence of Cu2+ resulted in the fluorescence and absorption spectra change of 1 and 2,which indicated that 1 and 2 showed a highly selective response to Cu2+ over other metal ions.However,3 showed no selectivity for metal ions,which means that the compound could bind with several metal ions,such as,Ni2+,Zn2+,Cd2+.Hg2+, Pb2+,Fe3+,Mg2+,Ca2+,and Co2+,except Cu2+ and Ag+.The different spectral responses were attributed to the difference in binding sites for 1 and 3. 相似文献
2.
A fluorescent chemosensor based on a quinoline derivative, L(2) (OFF state), selectively senses Zn(2+) by effective chelate-enhanced fluorescence (ON state), which further shows selectivity toward PPi over competing anions like Pi, AMP, and ATP via fluorescence quenching (OFF state) in a 100% aqueous HEPES buffer (pH 7.4). A plausible mode for the selective binding of PPi to 1 has been demonstrated by quantum mechanical density functional theory calculations and high-resolution mass spectrometry analysis. 相似文献
3.
Lin Lu Hu Sheng-Ting Yan Yao-Chao Wang Dun-Jia Fan Ling Hu Yan-Jun Yin Guo-Dong 《Research on Chemical Intermediates》2017,43(1):283-295
Research on Chemical Intermediates - A novel bispyrazole, 2,6-bis(5-phenyl-1H-pyrazol-3-yl)-pyridine, was designed and synthesized. The bispyrazole showed extreme selectivity for Ni2+ over other... 相似文献
4.
Thangaraj Anand Gandhi Sivaraman Murugan Iniya Ayyanar Siva Duraisamy Chellappa 《Analytica chimica acta》2015
Chemosensors based on aminobenzohydrazide Schiff bases bearing pyrene/anthracene as fluorophores have been designed and synthesized for F− ion recognition. The addition of fluoride ions to the receptors causes a dramatically observable colour change from pale yellow to brown/red. 1H NMR studies confirm that the F− ion facilitates its recognition by forming hydrogen bond with hydrogens of amide and amine groups. Moreover these sensors have also been successfully applied to detection of fluoride ion in commercial tooth paste solution. 相似文献
5.
Huang W Li Y Yang Z Lin H Lin H 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2011,79(3):471-475
A novel colorimetric anion-chemosensor based on 1,10-phenanthroline-2,9-dicarbonyl-p-nitro-phenylhydrazine has been synthesized. Among the different anions tested, it shows the best selectivity towards AcO(-). The addition of acetate causes the color to change from yellow to red, which could be detected with naked eyes. The binding ability of chemosensor 1 with anions has been investigated through UV-vis spectral titrations. In addition, (1)H NMR experiment was carried out to explore the nature of interaction between chemosensor 1 and acetate. 相似文献
6.
A new rhodamine-based chemosensor exhibiting selective Fe(III)-amplified fluorescence 总被引:3,自引:0,他引:3
[structure: see text] A new fluorescent probe 3 was synthesized, and it exhibited high selectivity for Fe(III) over other commonly coexistent metal ions in both ethanol and water. Upon the addition of Fe(III), the spirocyclic ring of 3 was opened and a significant enhancement of visible color and fluorescence in the range of 500-600 nm was observed. 相似文献
7.
Marta Beltramello Maddalena Gatos Fabrizio Mancin Paolo Tecilla Umberto Tonellato 《Tetrahedron letters》2001,42(52):9143-9146
A new chemosensor for the Cu(II) ion has been realized by connecting via an amido bond an anthracenyl residue to the all cis 2,4,6-triamino-1,3,5-trihydroxycyclohexane ligand (TACI). This sensor is able to detect micromolar concentrations of Cu(II) ions in water at pH 7 without interference with many other divalent transition metal ions. 相似文献
8.
Lin LR Fang W Yu Y Huang RB Zheng LS 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2007,67(5):1403-1406
A novel and simple fluorescence enhancement method for selectively sensing iodide was proposed based on metal complex formation between mercuric(II) ion with fluorophore (p-((dimethylamino)benzylidene)thiosemicarbazide, 1) and with anion in aqueous solution. The 1-Hg complex was found to show selectively and sensitively fluorescence enhancement response toward iodide over than S(2-), EDTA, SCN-, CH(3)CO(2-), Br-, Cl-, F-, H2PO4- and SO4(2-), which was attributed to the higher stability of inorganic complex between iodide and mercuric(II). 相似文献
9.
A novel 8-hydroxyquinoline derivative 3 was synthesized. Significant fluorescent quenching was found in the presence of Cu2+ and Hg2+ with notably higher selectivity for Cu2+ than Hg2+. 相似文献
10.
A new internal charge transfer probe, NAPH-1, synthesized by incorporating photoemitive naphthalimide core with an acidic imidazolium ring, offers highly selective colorimetric and ratiometric ‘off-on’ signaling for targeting F−, while Cl−, Br−, I−, , SCN−, AcO−, and do not appreciably perturb the photophysical properties of the probe even at relatively higher concentrations than the F−. Deprotonation of the imidazolium ring, supported by the 1H NMR and theoritical studies, seems to cause the spectral modulations. 相似文献
11.
Compound 1 as an electron donor-acceptor compound with N,N-dimethylaniline and quinone units was designed for a highly selective colorimetric determination of thiol-containing amino acids and peptides, by making use of the unique reactivity of thiol towards quinone. Compound 1 shows a strong intramolecular charge transfer (ICT) band around 582 nm; but, it decreased after addition of either cysteine (Cys) or glutathione (GSH). Moreover, the ICT band intensity at 582 nm decreased linearly with the increasing concentrations of Cys or GSH. The interference from other amino acids can be neglected. Therefore, compound 1 can be employed as a selective colorimetric visual chemosensor for thiol-containing amino acids and peptides. 相似文献
12.
《印度化学会志》2023,100(4):100985
A Schiff base ligand L has been designed and synthesized by the condensation of 1′-Hydroxy-2′-acetonaphthonehydrazide with pyrene aldehyde for the detection of Cu2+ ions. The ligand was spectroscopically characterized by all possible techniques. Among different metal ions, Cu2+ ions give a tremendous enhancement of fluorescence intensity in 20% water with THF. The “Turn-On” fluorescence for Cu2+ ions utilizes the Photo-induced Electron Transfer (PET) mechanism. It has been observed that the presence of relevant cations and anions did not affect the probe's fluorescence intensity. The stoichiometric binding mode of the complex is confirmed using Job's method. The low detection limit and reversibility make it cost-effective. 相似文献
13.
Absorption spectra of a number of shellfish extracts have been obtained and reveal prominent absorptions in all samples at 210 and 260 nm and at 325 nm in some of them. These absorptions preclude the use of chromophores with similar absorptions in testing of shellfish samples for paralytic shellfish toxins. Two crown ether chemosensors featuring a boron azadipyrrin chromophore have been synthesized; both have absorption maxima at 650 nm, where all the shellfish extracts are transparent. The synthetic sensors feature either 18- or 27-membered crown ether rings and have been evaluated as visible sensors for the paralytic shellfish toxin saxitoxin. The binding constant for one of them is in the range of 3-9x10(5) M-1 and exhibits a fluorescence enhancement of over 100% at 680 nm in the presence of 40 microM saxitoxin. 相似文献
14.
Moloy Sarkar 《Tetrahedron letters》2006,47(43):7575-7578
An ‘off-on’ fluorescence chemosensor for the selective signalling of Cr(III) has been designed exploiting the guest-induced inhibition of the photoinduced electron transfer signalling mechanism. The system shows an approximately 17-fold Cr(III)-selective chelation-enhanced fluorescence response in tetrahydrofuran and the system is highly selective against the background of environmentally and biologically relevant metal ions. 相似文献
15.
《化学研究》2015,(6)
设计了基于联萘酚衍生物(LZ)的高选择性的荧光化学传感器,分别采用荧光光谱和紫外-可见光谱法研究了其对Ca~(2+)的识别.结果显示,与其他金属离子,如Ag~+、Al ~(3+)、Bi ~(3+)、Cd~(2+)、Co~(3+)、Cr~(3+)、Cu~(2+)、Fe~(3+)、Hg~(2+)、K~+、Mg~(2+)、Mn~(2+)、Ni ~(2+)、Pb~(2+)、Zn~(2+)相比,探针LZ对Ca~(2+)呈现良好的选择性.并且该探针在486nm处的荧光强度与Ca~(2+)浓度在2~7μmol/L范围内呈现良好的线性关系,其回归系数为0.994,检测限为0.8μmol/L,多次测定的相对标准偏差为2%. 相似文献
16.
Yan-Li Leng Jian-Hui Zhang Qiao Li You-Ming Zhang Qi Lin Hong Yao 《Phosphorus, sulfur, and silicon and the related elements》2016,191(10):1318-1323
A colorimetric and fluorescent cyanide probe bearing naphthol and sulfahydrazone groups has been designed and synthesized. This structurally simple probe displays a rapid response and high selectivity for cyanide in DMSO/EtOH (v/v = 2:8) solution. The addition of CN? to the sensor p-toluenesulfonyl-2-hydroxy-1-naphthylhydrazone (L3) induced a remarkable color change from pale-yellow to yellow, and green fluorescence changed to yellow. The 1H NMR titration and DFT calculations suggested that the selective sensing process is based on a nucleophilic addition reaction of cyanide to imine. Test strips based on sensor L3 were fabricated, which could act as a convenient and efficient test kit to detect CN? for “in-the-field” measurements. 相似文献
17.
Otón F Tárraga A Velasco MD Espinosa A Molina P 《Chemical communications (Cambridge, England)》2004,(14):1658-1659
A new difunctionalized receptor based on an aza-ferrocenophane structure shows electrochemical and fluorescent responses to fluoride anion. 相似文献
18.
The article depicts a detailed study regarding copper selective chemosensing and complexation nature of 5,11,17,23-tetrakis[(N,N-diphenylamino)methyl]-25,26,27,28-tetrahydroxycalix[4]arene (PAC4). Its photophysical characteristics in various solvents of different polarities along with the influence of acid and base on its spectral properties in these solvents are also discussed. The complexation affinity of PAC4 with regard to its latent applications as Cu(II) selective colorimetric and fluorescent sensor among the selected series of various cations such as Li(I), Na(I), K(I), Rb(I), Ba(II), Sr(II), Al(III), Fe(III), Cd(II), Co(II), Hg(II), Mn(II), Ni(II), Pb(II) and Zn(II) was examined by UV–visible and fluorescence emission spectroscopy in dichloromethane:acetonitrile (DCM:MeCN) solvent system. In addition, the process of complexation has been investigated through Job's plot and it has been observed that the complex between PAC4 and Cu(II) is formed in 1:1 stoichiometric ratio. The complex formation between PAC4 and Cu(II) has also been confirmed by FT-IR spectroscopy and thermal gravimetric analysis (TGA). 相似文献
19.
A novel photochromic Schiff base derivative, 5,17-N,N′-(5,5′-di-methoxyl-benzlaldehyde)diimine-25,27-dipropoxy-calix[4]arene has been synthesized through incorporation of two imine groups into the upper rims of calix[4]arene. The experiments showed that the addition of Dy3+ or Er3+ ions to compound 4 results in the solution color change, but other metal ions caused less change. It indicated that the synthetic receptor can selectively recognize Dy3+ and Er3+ ion by naked eye over other lanthanide cations. Thus, these systems can be applied as chemosensor for Dy3+ and Er3+ ion in analytical chemistry. 相似文献
20.
Jing Cao Hai Yan Deng Chen Hui Wang Yao Xiao Ming Ren You Wei Zhang 《Supramolecular chemistry》2013,25(11):777-781
A 3,4-dimethylthieno[2,3-b]thiophene-based fluorogenic probe bearing benzo[d]-thiazole-2-thio unit (sodium 3,4-bis ((benzo[d]thiazol-2-ylthio)methyl) thieno [2, 3-b]thio-phene-2, 5-dicarboxylate) was developed as a novel fluorescent chemosensor with high selectivity towards Pb(II) over other cations tested. The new probe exhibited good water solubility and only sensed Pb(II) among metal ions examined in neutral 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid buffer solution. The selectivity and sensitivity of fluorogenic probe to Pb(II) were discussed on the basis of experimental results. 相似文献