Highly selective and sensitive turn-on fluorescent probes for sensing Hg2+ ions in mixed aqueous solution
| Autor: | Wen-Ying He, Bin Liu, Li Huang, Jiang-Shan Shen, Di Shi, Xiangying Sun, Zhen-Long Wu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Aqueous solution
Chemistry Metal ions in aqueous solution Metals and Alloys 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Condensation reaction Photochemistry 01 natural sciences Fluorescence 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion chemistry.chemical_compound Salicylaldehyde Excited state Materials Chemistry Moiety Electrical and Electronic Engineering 0210 nano-technology Instrumentation |
| Zdroj: | Sensors and Actuators B: Chemical. 281:311-319 |
| ISSN: | 0925-4005 |
| Popis: | A highly selective and sensitive probe 1b was successfully developed for detecting Hg2+ ions in mixed aqueous medium with a “turn on” fluorescence mode, via a series of structural optimization of probes. These probes could be easily synthesized by one-step condensation reactions between o-phenylenediamine or 2, 3-diaminonaphthalene and o (salicylaldehyde), m, or p-hydroxybenzaldehyde. Introducing a certain amount of Hg2+ ions the fluorescence of probes bearing one or two salicylaldehyde moieties including probes 1a, 1b, and 4 could be turned on. The fluorescent response is likely due to the well matching between Hg2+ ions size and the geometric structure of probes, resulting in that probes bearing salicylaldehyde moiety are mostly favorable for binding with Hg2+ ions by way of 1:1 molar ratio. These bindings likely facilitate excited state internal proton transfer (ESIPT) or ESIPT coupled aggregation-induced enhancement of emission (AIEE) process. Considering the sensitivity and the potential of practical application, probe 1b was chosen to establish a fluorescent enhancement sensing system towards Hg2+ ions over other competing metal ions, with excellent limit of detection of 12.5 ppb. |
| Databáze: | OpenAIRE |
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