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A novel carbazate-based fluorescent sensor BC-MS was developed for the detection of Zn2+. In the presence of Zn2+, BC-MS showed a strong fluorescence enhancement with a 1:1 stoichiometry. Significantly, BC-MS could determine the presence of Zn2+ without the inhibition of Cd2+. The detection mechanism of BC-MS toward Zn2+ was proposed through analytical tools like UV-vis spectroscopy, Job plot, ESI-MS, 1H NMR titration and theoretical calculations. A novel carbazate-based fluorescent sensor BC-MS was developed for detection of Zn2+BC-MS showed a strong fluorescence enhancement in the presence of Zn2+ without the inhibition of Cd2+. The detection mechanism of BC-MS to Zn2+ was supported by theoretical calculations. [ABSTRACT FROM AUTHOR]

[Display omitted] • A novel colorimetric sensor CTQ for consecutive detection of Cu2+ and S2− was developed. • CTQ and CTQ-Cu2+ detected Cu2+ and S2− down to 0.55 μM and 0.45 μM, respectively. • CTQ could be applied to test strips and real water samples for detecting Cu2+ and S2−. • CTQ was the first benzothiadiazole-based chemosensor which could sequentially detect Cu2+ and S2−. • Detecting mechanisms of CTQ to Cu2+ and S2− were demonstrated by spectroscopic studies and DFT calculations. A novel colorimetric probe CTQ for consecutive detection of Cu2+ and H 2 S was synthesized, based on benzothiadiazole moiety. CTQ displayed colorimetric change from orange to violet with Cu2+ and the resulting CTQ -Cu2+ complex could detect H 2 S through the cation displacement process. The stoichiometries of CTQ to Cu2+ and CTQ -Cu2+ to H 2 S were found to be 1:1, and their detection limits were valued at 0.55 and 0.45 μM. The practical applications of CTQ to Cu2+ and H 2 S in real water samples and test strips were successfully achieved. The successive detection of Cu2+ and H 2 S by CTQ could be repeated several times. Job plot, ESI-MS, FT-IR experiments and DFT calculations were performed to investigate the sensing mechanisms of CTQ to Cu2+ and H 2 S. [ABSTRACT FROM AUTHOR]

A diacylhydrazone-based fluorescent probe HMPD was developed for the detection of Al3+ with a binding ratio of 1:2. HMPD could selectively detect Al3+ with a low detection limit (0.76 μM) without the inhibition of Ga3+ and In3+ in the same periodic group. The practicality of HMPD was shown by the application in real water samples and test strips and HMPD -Al3+ complex could be recycled several times through sequential EDTA application. The sensing mechanism of HMPD to Al3+ was demonstrated with the spectroscopic studies and theoretical calculations. [Display omitted] A novel diacylhydrazone-based fluorescent sensor HMPD was developed for the sensing of Al3+. In the presence of Al3+, HMPD showed a marked fluorescence increment with a 1:2 stoichiometry of HMPD to Al3+. Detection limit of HMPD to Al3+ was found as 0.76 μM. HMPD could determine Al3+ irrespective of the presence of Ga3+ and In3+. HMPD was satisfactorily applied to the qualification of Al3+ in real water samples and test strips. The sensing process of HMPD to Al3+ was reversible by EDTA application. Binding process of HMPD to Al3+ was proposed through fluorescence and UV–vis spectroscopy, Job plot, FT-IR spectroscopy, ESI-MS, 1H NMR titration and theoretical calculations. [ABSTRACT FROM AUTHOR]

Fluorescence enhancement of sensor caused by ClO− in aqueous solution and zebrafish. [Display omitted] • Fluorescence sensor for ClO−. • Hypochlorite in zebrafish. • Detection of ClO− in water. Hypochlorite is used as a water disinfectant and it is also produced by biological organisms. Its detection and quantification is important and could lead to its mechanism of reactivity in cells. We have synthesized a new fluorescence sensor for hypochlorite based on bithiophene and furan-carbohydrazide. The sensor shows increased fluorescence as a function of hypochlorite and is selective for hypochlorite. Fluorescence enhancement due to hypochlorite is observed when the sensor is used in aqueous solutions at neutral pH values. Using the sensor, the detection limit for hypochlorite is 4.2 µM, making the sensor practical to determine hypochlorite in water. Applying the sensor to aide in the detection of hypochlorite in zebrafish, showed localization of ClO−/HClO in the air bladders and eyes of zebrafish. [ABSTRACT FROM AUTHOR]

A novel acylhydrazone-based fluorescent sensor NATB was designed and synthesized for consecutive sensing of Al3+ and H2PO4−. NATB displayed fluorometric sensing to Al3+ and could sequentially detect H2PO4− by fluorescence quenching. The limits of detection for Al3+ and H2PO4− were determined to be 0.83 and 1.7 μM, respectively. The binding ratios of NATB to Al3+ and NATB-Al3+ to H2PO4− were found to be 1:1. The sequential recognition of Al3+ and H2PO4− by NATB could be repeated consecutively. In addition, the practicality of NATB was confirmed with the application of test strips. The sensing mechanisms of Al3+ and H2PO4− by NATB were investigated through fluorescence and UV–Visible spectroscopy, Job plot, ESI-MS, 1H NMR titration, and DFT calculations. [ABSTRACT FROM AUTHOR]

• A carbazate-based colorimetric sensor HB was developed for relay detection of Cu2+ and S2−. • HB could detect Cu2+ and S2- with low detection limits (0.20 and 0.60 μM). • HB and HB -Cu2+ could detect Cu2+ and S2− without any interference of other ions. • Sensing mechanisms of HB to Cu2+ and S2− were demonstrated by DFT calculations. A benzyl carbazate-based colorimetric chemosensor HB (benzyl (E)- 2-(2-hydroxy-3methoxy-5-nitrobenzylidene)hydrazine-1-carboxylate) was synthesized and used for relay detection of Cu2+ and S2−. HB can sense Cu2+ by the color variation from yellow to colorless and be used in real sample. HB -Cu2+ detected S2− though demetallation with color variation form colorless to yellow. Detection limits of HB for Cu2+ and S2− were calculated to be 0.20 and 0.60 μM which are greatly below WHO guidelines (31.4 and 14.8 μM). In addition, HB and HB -Cu2+ could detect Cu2+ and S2−, respectively, without any interference of other ions. The detection processes of HB to Cu2+ and S2− were illustrated by ESI-MS, UV-visible spectroscopy and DFT calculation. [ABSTRACT FROM AUTHOR]

An indole-based fluorescent chemosensor IH-Sal was synthesized to detect Zn2+. IH-Sal displayed a marked fluorescence increment with Zn2+. The detection limit (0.41 μM) of IH-Sal for Zn2+ was greatly below that suggested by the World Health Organization. IH-Sal can quantify Zn2+ in real water samples. More significantly, IH-Sal could determine and depict the presence of Zn2+ in zebrafish. The detecting mechanism of IH-Sal toward Zn2+ was illustrated by fluorescence and UV–visible spectroscopy, DFT calculations, 1H NMR titration and ESI mass. [ABSTRACT FROM AUTHOR]