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A versatile chemosensor 1 (E)-2-(((8-hydroxy-2,3,6,7-tetrahydro-1H,5H-pyrido[3,2,1-ij]quinolin-9-yl)methylene)amino)-1H-benzo[de]isoquinoline-1,3(2H)-dione, based on naphthalimide and julolidine moieties, was developed for highly distinguishable and selective recognition of Group IIIA metal ions (Al3+, Ga3+ and In3+). Sensor 1 exhibited significant ‘off–on’ fluorescence responses at 488 nm in the presence of Al3+ and at 570 nm in the presence of Ga3+ and In3+. The same emission of Ga3+ and In3+ could be distinguished through different color changes (from colorless to yellow for Ga3+ and no color change for In3+). Binding constants of 1 for Ga3+ and In3+ are the highest reported to date for an organic chemosensor. A 2 : 1 binding mode between 1 with Al3+, Ga3+ and In3+ is proposed based on electrospray ionization mass spectrometry, Job plot analysis, and theoretical calculations. [ABSTRACT FROM AUTHOR]

A versatile chemosensor 1 (E)-2-(((8-hydroxy-2,3,6,7-tetrahydro-1H,5H-pyrido[3,2,1-ij]quinolin-9-yl)methylene)amino)-1H-benzo[de]isoquinoline-1,3(2H)-dione, based on naphthalimide and julolidine moieties, was developed for highly distinguishable and selective recognition of Group IIIA metal ions (Al3+, Ga3+ and In3+). Sensor 1 exhibited significant ‘off–on’ fluorescence responses at 488 nm in the presence of Al3+ and at 570 nm in the presence of Ga3+ and In3+. The same emission of Ga3+ and In3+ could be distinguished through different color changes (from colorless to yellow for Ga3+ and no color change for In3+). Binding constants of 1 for Ga3+ and In3+ are the highest reported to date for an organic chemosensor. A 2 : 1 binding mode between 1 with Al3+, Ga3+ and In3+ is proposed based on electrospray ionization mass spectrometry, Job plot analysis, and theoretical calculations. [ABSTRACT FROM AUTHOR]

We reported a new quinoline-based fluorescent probe 1 for Zn 2+ and S 2− . 1 showed a highly selective fluorescence enhancement toward Zn 2+ over other metal ions including Cd 2+ , and the resulting 1 -Zn 2+ complex could detect only S 2− among the various anions. The detection limits (0.09 μM and 0.88 μM) for Zn 2+ and S 2− were much lower than recommended values (76 μM for Zn 2+ and 14.8 μM for S 2− ) by WHO. Their recognition mechanisms were explained by Job plots, UV–vis titrations, 1 H NMR titrations, ESI-mass, and theoretical calculations. Moreover, compound 1 with the great photostability and low biotoxicity showed sequentially off-on-off fluorescent bio-imaging of Zn 2+ and S 2− in both HeLa cells and live zebrafish larvae. [ABSTRACT FROM AUTHOR]

A new multifunctional colorimetric and fluorescent chemosensor 1 for Fe3+/2+ and Al3+ has been synthesized in the one-step procedure. The sensor 1 detected both Fe2+ and Fe3+ through the color change from yellow to brown and Al3+ via turn-on fluorescence. The binding stoichiometries of sensor 1 with Fe3+/2+ and Al3+ were proposed to be 1:1 with the analyses of ESI-mass and Job plot. Importantly, the detection limits of 1 for Fe3+/2+ (2.11 and 2.70 μM) and Al3+ (3.44 μM) were lower than the EPA guideline (5.37 μM) for Fe3+/2+ and WHO guideline (7.41 μM) for Al3+. Compound 1 was used to quantify ferric species (Fe3+) in real samples. Moreover, the sensing processes for Fe3+/2+ and Al3+ were proposed with the spectroscopic studies and theoretical calculations. [ABSTRACT FROM AUTHOR]

A new simple aminohydantoin-based fluorescent chemosensor 1 was designed for sequential detection of Zn 2+ and pyrophosphate in a near-perfect aqueous solution. 1 exhibited significant fluorescence intensity in the presence of Zn 2+ , and the resulting 1 -Zn 2+ complex showed subsequently the fluorescent quenching with pyrophosphate. The detection limit (0.32 μM) of 1 for Zn 2+ was far lower than the guideline of World Health Organization in drinking water. 1 was used to determine Zn 2+ concentration in various water samples. In addition, chemosensor 1 could be applied to sequentially detect Zn 2+ and pyrophosphate in living cells and zebrafish. The sensing mechanism of Zn 2+ by 1 was proposed to be an intramolecular charge transfer with theoretical calculations. [ABSTRACT FROM AUTHOR]

A new multifunctional chemosensor 1, (E)-2-(((2-hydroxynaphthalen-1-yl)methylene)amino)-1H-benzo[de]isoquinoline-1,3(2H)-dione, based on naphtalimide and naphthaldehyde was developed, which showed the fluorescence responses to trivalent metal ions (Ga3+, Al3+ and Cr3+). Sensor 1 detected and differentiated selectively trivalent metal ions Ga3+, Al3+ and Cr3+ by fluorescence enhancement at different emissions. The association constant of Ga3+-2∙1 complex is the highest one among those of the organic chemosensors reported, to date. The sensing mechanisms for Ga3+, Al3+ and Cr3+ were explained by UV-vis titrations, Job plots, ESI-mass analyses and theoretical calculations. [ABSTRACT FROM AUTHOR]

A new multifunctional chemosensor 1, (E)-2-(((2-hydroxynaphthalen-1-yl)methylene)amino)-1H-benzo[de]isoquinoline-1,3(2H)-dione, based on naphtalimide and naphthaldehyde was developed, which showed the fluorescence responses to trivalent metal ions (Ga3+, Al3+ and Cr3+). Sensor 1 detected and differentiated selectively trivalent metal ions Ga3+, Al3+ and Cr3+ by fluorescence enhancement at different emissions. The association constant of Ga3+-2∙1 complex is the highest one among those of the organic chemosensors reported, to date. The sensing mechanisms for Ga3+, Al3+ and Cr3+ were explained by UV-vis titrations, Job plots, ESI-mass analyses and theoretical calculations. [ABSTRACT FROM AUTHOR]

Chemosensor 1 was synthesized by the reaction of octopamine with 2,3-dihydroxybenzaldehyde. Sensor 1 determined iron with an obvious color change from pale yellow to brown in nearly-pure water. The detection limits (0.55 and 0.25 μM) for Fe2+ and Fe3+, respectively, were far lower than the EPA (Environmental Protection Agency) guideline concentration for drinking water (5.37 μM). In addition, 1 could be employed to quantify iron in environmental water samples. Moreover, sensor 1 exhibited different fluorescence emissions in response to zinc (green) and cadmium (blue). The binding structures and sensing mechanisms of 1 for iron, zinc and cadmium were proposed from various spectroscopic studies and theoretical calculations. [ABSTRACT FROM AUTHOR]

A new colorimetric chemosensor 1 for the sequential detection of Ni 2+ and CN − was designed and synthesized. The presence of Ni 2+ led to a distinct naked-eye color change from colorless to yellow in a near-perfect aqueous solution. To examine the binding mechanism of 1 with Ni 2+ , UV3–vis spectroscopy, ESI-mass spectrometry analysis and DFT calculations were conducted. The detection limit of 1 for Ni 2+ was down to nanomolar concentration (57 nM). Also, the sensing ability of 1 for Ni 2+ was successfully carried out in real water samples (tap, drinking and sewage water). Moreover, the resulting 1 -Ni 2+ complex acted as an efficient colorimetric chemosensor for CN − via a color change from yellow to colorless. Therefore, chemosensor 1 can be employed as a practical colorimetric chemosensor for detecting of both Ni 2+ and CN − . [ABSTRACT FROM AUTHOR]

A simple colorimetric receptor 1 based on the combination of N -(5-nitro-2-pyridyl)-1,2-ethanediamine and 4-(diethylamino)-2-hydroxybenzaldehyde was synthesized for the sequential detection of Cu 2 + and CN − . The receptor 1 showed a distinct color change toward Cu 2 + from colorless to yellow. The detection limit of 1 for Cu 2 + (0.88 μM) was much lower than the World Health Organization guideline (31.5 μM) as the maximum allowable copper concentration in drinking water. In addition, 1 -Cu 2 + complex could be used to detect cyanide by showing a color change from yellow to colorless, indicating the recovery of 1 from 1 -Cu 2 + . Furthermore, the sensing mechanism of 1 for Cu 2 + was supported by theoretical calculations. [ABSTRACT FROM AUTHOR]

A novel quinolone-based fluorescent chemosensor 1 was designed and synthesized for hydrogen sulfide. Distinct “turn-on” fluorescence enhancement of 1 was observed upon the addition of S 2 − in aqueous solution. Sensor 1 showed high sensitivity toward S 2 − with the detection limit of 7.0 μM. The recognition properties of sensor 1 toward S 2 − were studied by using photophysical experiments and its reaction-based sensing mechanism was supported by ESI-mass spectroscopy analysis. Practically, the sensing ability of 1 for S 2 − was successfully applied in real water samples. [ABSTRACT FROM AUTHOR]

A new selective and sensitive colorimetric chemosensor 1 was developed for the sequential detection of Cu 2+ and glutathione (GSH) in aqueous solution. The sensor 1 detected Cu 2+ ion by an obvious color change from colorless to pale yellow. Importantly, 1 could be used to detect and quantify Cu 2+ ion in water samples, and the detection limit (0.14 μM) of 1 for Cu 2+ was much lower than the guideline (31.5 μM) of WHO in drinking water. Also, Cu 2+ -2· 1 complex can be used as a colorimetric sensor for GSH via naked-eye. The detection limit for GSH was founded to be 2.98 μM. Moreover, the sensing ability of 1 for Cu 2+ was supported by theoretical calculations. [ABSTRACT FROM AUTHOR]