A novel dicoumarin‐derived hydrogen sulfide (H2S) selective fluorescent “turn‐on” probe 3‐(2,4‐dinitrobenzenesulfonate)‐dicoumarin (DC‐HS) created by covalent bonding between the 2,4‐dinitrobenzenesulfonyl (DNBS) and the 3‐hydroxy‐dicoumarin (DC‐OH) units. Upon the addition of H2S, the probe DC‐HS solution's fluorescence significantly increased, and its appearance is changed from practically colorless to brilliant yellow. Probe DC‐HS also showed significant fluorescence amplification that was quantitatively detectable in the concentration range of 0–1.5 μM and had a low detection limit or limit of detection of 0.2 nM. Moreover, with a high recovery rate and excellent accuracy, the developed fluorescent molecule was used successfully for the analysis of H2S in red wine samples.
Copper is the third most abundant essential transition metal ion in the human body. It's responsible for important activities in many living things, but excessive intake of Cu2+ can lead to a range of diseases. A colorimetric and turn‐off fluorescent probe (E)‐2‐(5‐(benzothiazol‐2‐yl)‐2‐(diethylamino)‐4‐hydroxybenzylidene)‐N‐phenylhydrazine‐1‐carbothioamide (ZTR) was designed and synthesized by thiosemicarbazone Schiff base as a specific complexes site strategy to achieve highly specific Cu2+ detection. The fluorescence of the probe ZTR solution fell dramatically when Cu2+ was added, and its appearance changed from dazzling blue to nearly colorless. The simple structure and readily available fluorescent probe provide a novel approach for the quantitative detection of Cu2+ in the linear range from 0 to 0.12 μM, with a detection limit down to 16 nM, and with high selectivity for Cu2+ over 15 other metal ions. Job’s plot analysis showed that probe ZTR and Cu2+ formed a 1:1 coordination complex. In addition, because of its low detection limits and fast response time, the created fluorescent molecule was effectively used to study the target ions on test paper strips and in water samples.))
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