Back to Search
Start Over
Turn-off and -on fluorescence switching of a self-assembled sensor for mercury(II) induced by anionic micelles
- Publication Year :
- 2020
-
Abstract
- The self-assembling of the 10-methylacridinium perchlorate fluorophore and azathiocrown ether derivative receptor through sodium dodecyl sulfate (SDS) or sodium 4-octylbenzenesulfonate (SOBS) aggregates in water has allowed the realization of a new effective sensing system for Hg2+ ions. In the absence of metal ions, occurrence of the fluorophore-receptor interaction was signaled through the fluorescence quenching of acridinium. Upon addition of increasing quantities of Hg2+, fluorescence experiments pointed out an unusual further quenching of the acridinium fluorescence, followed by an emission enhancement with a switching point around 1 × 10−7 and 1 × 10−8 M in SDS and SOBS, respectively. Such a behavior was attributed to the formation of mercury-receptor complexes with different coordination number and accordingly with distinct redox activity. The stoichiometry of the mercury complexes was assessed by spectrophotometric titration, while insights into their structures were obtained with density functional theory (DFT) calculation. Hg2+ ions can be selectively detected in SDS solutions, and its concentration in the nanomolar range can be linearly determined. Altogether, this modular approach allows quick variation of the components, which makes the optimal tuning of the process up to its maximum efficiency level very easy.
- Subjects :
- Fluorophore
General Chemical Engineering
Metal ions in aqueous solution
02 engineering and technology
010402 general chemistry
Photochemistry
01 natural sciences
Micelle
Electron transfer
chemistry.chemical_compound
Perchlorate
Mercuric ion
Sodium dodecyl sulfate
Anionic micelle
Fluorescence switching
Quenching (fluorescence)
Process Chemistry and Technology
Self-assembled sensor
021001 nanoscience & nanotechnology
Fluorescence
0104 chemical sciences
chemistry
Complex stoichiometry
0210 nano-technology
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....d2b26fd131c4b22e996f589d88b8dcf6