| Autor: |
Kraithong, Sasiwimon, Sangsuwan, Rapeepat, Worawannotai, Nattawan, Sirirak, Jitnapa, Charoenpanich, Adisri, Thamyongkit, Patchanita, Wanichachewa, Nantanit |
| Předmět: |
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| Zdroj: |
New Journal of Chemistry; 8/7/2018, Vol. 42 Issue 15, p12412-12420, 9p |
| Abstrakt: |
A new fluorescent sensor (DiNBD) was successfully synthesized; the sensor consisted of two 7-nitrobenzo-2-oxa-1,3-diazolyl (NBD) units that were covalently attached to 2-(4-(2-aminoethylthio)butylthio)ethanamine by a conventional two-step synthesis. It could serve as a colorimetric and fluorescent sensor for Hg2+ in aqueous acetonitrile solutions with high selectivity over other competitive metal ions. Upon Hg2+ titration, the sensor exhibited “ON–OFF” fluorescence quenching at 526 nm (λex 458 nm) and “OFF–ON” fluorescence enhancement at 560 nm (λex 530 nm), which were accompanied by a colorimetric change from yellow to red. The Hg2+ detection limit of the sensor was 0.7 ppb, which is lower than the permitted level of Hg2+ in drinking water regulated by US EPA and WHO. Additionally, the fluorescence quenching and fluorescence enhancement of the sensor in the presence of Hg2+ could provide a precise determination of Hg2+ concentration due to their self-calibration. Moreover, the DiNBD fluorescent sensor could be used to determine Hg2+ in real samples and living cells, which could widen the applications of the developed sensor. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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