A multi-target sensor, based on hydrazono-quinoline, was developed for fluorescence turn-on detection of In3+ and Zn2+ and colorimetric detection of ClO−.
A water‐applicable hexamethylbenzene (HMB) chemosensor, (E)‐2‐((2‐hydroxy‐3‐methoxybenzylidene)amino)benzamide, displayed a selective colour change from colourless to yellow in the existence of copper ions. The detection limit was computed as 1.57 μmol/L, which is substantially lower than the World Health Organisation guideline (31.5 μmol/L) for copper ions. Probe HMB could also sense and quantify copper ions in real water samples. The coordination mode of HMB to copper ions was demonstrated through Job plot, electrospray ionisation mass spectroscopy and proton nuclear magnetic resonance titration, and was also supported by theoretical studies.
A novel selective and sensitive chemosensor, (E)-1-((((1H-benzo[d]imidazol-2-yl)methyl)imino)methyl)naphthalen-2-ol (BIN), was developed for fluorescence detection of Zn2+. The compound BIN acts as a fluorescent “turn-on” detector for Zn2+. The limit of detection (2.26 µM) for zinc ion is well below the WHO standard (76.0 µM). Probe BIN can be chemically reversible with ethylenediaminetetraacetic acid (EDTA). The binding mechanism of BIN with zinc ion was demonstrated by fluorescence, UV-visible, electrospray ionization mass spectroscopy, 1H NMR titration and calculations. Importantly, probe BIN could be applied to determine zinc ion in water samples and living zebrafish.
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