| Autor: |
Dey S; Department of Chemistry, School of Sciences, Gujarat University, Ahmedabad-380009, India. drvkjain@hotmail.com., Kumar A, Mondal PK, Modi KM, Chopra D, Jain VK |
| Jazyk: |
angličtina |
| Zdroj: |
Dalton transactions (Cambridge, England : 2003) [Dalton Trans] 2020 Jun 14; Vol. 49 (22), pp. 7459-7466. Date of Electronic Publication: 2020 May 20. |
| DOI: |
10.1039/d0dt00452a |
| Abstrakt: |
An oxacalix[4]arene-Ce(iii) complex viz. L-Ce(III) has been introduced for the selective detection of As(v) and Cr(vi) oxyanions in aqueous medium. The binding mode of L-Ce(III) + AsO 4 3- /CrO 4 2- was completely investigated with fluorometric titration, time resolve fluorescent decay and FTIR analyses. Photoinduced electron transfer (PET) and chelation-enhanced fluorescence (CHEF) play an important role in the sensing of these oxyanions. The characteristic fluorescence of the L-Ce(III) complex has been quenched by AsO 4 3- and CrO 4 2- through cascading the ligating sites. Cyclic voltammetry (CV) experiments with various scan rates suggest that the electrochemical processes on the electrodes were controlled by diffusion. Both the analytes exhibit a lower limit of detection (LOD) below their standard EPA permissible limits. Moreover, the probe successfully detects the oxyanions in environmental real samples with excellent recovery ranging from 97 to 101%. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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