Journal Article10.1016/J.SNB.2016.10.121
Reversible ‘turn off’ fluorescence response of Cu2+ ions towards 2-pyridyl quinoline based chemosensor with visible colour change
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TL;DR: In this article, a novel chemosensor, 4(1 H -benzo[d ]imidazol-2-yl)-2-(pyridin-2yl)quinoline is described which could selectively detect Cu 2+ ions.
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Abstract: A novel chemosensor, 4(1 H -benzo[ d ]imidazol-2-yl)-2-(pyridin-2-yl)quinoline is described which could selectively detect Cu 2+ ions Addition of Cu 2+ ions changes solution of chemosensor from colourless to yellow which is clearly visible to the naked eyes Fluorescence of chemosensor was quenched by 18 folds in presence of Cu 2+ ions Cu 2+ ions sensing property of chemosensor was remained unaffected in presence of other metal ions (Na + , Mg 2+ , K + , Mn 2+ , Ca 2+ , Fe 2+ , Co 2+ , Zn 2+ , Cd 2+ , Ba 2+ , Hg 2+ and Pb 2+ ) Moreover, the sensing of Cu 2+ was found to be reversible, since the Cu 2+ induced quenching of emission spectra was reversed upon addition of EDTA The stoichiometry of binding of chemosensor and Cu 2+ was determined by Job‘s plot which was found to be 1:1 and further it was confirmed by ESI-MS analysis Binding of Cu 2+ ions to chemosensor was studied over the wide pH range and the result demonstrated maximum fluorescence quenching in the pH range of 30–10 The binding association constant (Ka) value determined from Benesi–Hildebrand equation was 338 × 10 5 M −1
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Citations
A novel quinoline-derived fluorescent “turn-on” probe for Cu2+ with highly selectivity and sensitivity and its application in cell imaging
TL;DR: In this paper, a quinoline-derived Schiff base fluorescent probe 2-(2-hydroxybenzylidene)hydrazono)methyl quinolin-8-ol (QH) showed a highly selective and sensitive detection of Cu2+ with significant fluorescence “turn-on” response and the solution color changed from colorless to yellowish green.
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A novel pyrazoline-based fluorometric “Turn-off” sensing for Hg2+
Ebru Bozkurt,Halise Inci Gul +1 more
TL;DR: In this paper, a pyrazoline derivative (4]-3-(4-hydroxyphenyl)-5-(2-thienly)-4,5-dihydro-pyrazol-1-yl]benzenesulfonamide, compound 1 ) was used for metal ion selectivity based on fluorometric detection.
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A colorimetric quinoline-based chemosensor for sequential detection of copper ion and cyanide anions
TL;DR: In this paper, a quinoline-based chemosensor for sequential detection of Cu2+ and CN− has been synthesized, where diaminomaleonitrile is introduced as recognition group.
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A new oxadiazole-based dual-mode chemosensor: Colorimetric detection of Co2+ and fluorometric detection of Cu2+ with high selectivity and sensitivity
TL;DR: In this article, an asymmetrical oxadiazole derivative (Sensor 1) containing one pyridine and one formyl connecting to two benzene rings on both sides of the unit was designed and synthesized, which exhibited an instantaneous naked-eye color change and could be used as a convenient test kit for recognition and detection of Co2+ ions.
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Fluorescent sensor for copper(II) ions based on coumarin derivative and its application in cell imaging
TL;DR: In this paper, a novel fluorescent sensor CHT based on the excellent optical properties of coumarin derivatives was designed, and the sensor exhibited good sensitivity, fast response time, high selectivity for Cu2 + ions in the presence of other important relevant metal ions.
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