A Facile Preparation of a New Water-Soluble Acridine Derivative and Application as a Turn-off Fluorescence Chemosensor for Selective Detection of Hg2.
J Fluoresc
; 30(2): 235-247, 2020 Mar.
Article
em En
| MEDLINE
| ID: mdl-31974874
ABSTRACT
A new acridine-based chemosensor was prepared, characterized and investigated for quantitative detection of Hg2+ ions in aqueous solutions. DFT and TD-DFT calculations showed that formation of a coordination bond between Hg2+ and the thiolate-sensor accounts for the fluorescence quenching, forming [HgLSCl2]2- as the most stable species. Limit of detection and limit of quantification were as low as 4.40 and 14.7 µmol L-1, respectively (R2 = 0.9892, least squares method), and a linear concentration range of 14.7-100 µmol L-1. Benesi-Hildebrand and Job formalisms are in accordance with the formation of a stable complex with a 11 (metal ion/sensor) ratio, and a determined binding constant of 5.14 × 103 L mol-1. Robustness was verified based on the variation of several analytical conditions. In addition, the method presented maximum relative standard deviation of 4.6%, and recovery results was (90.3 ± 4,6)% from distilled water, with no effect of interfering ions. Analytical figures of merit showed that the sensor can be an attractive low cost alternative for detection of Hg2+.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Acridinas
/
Corantes Fluorescentes
/
Mercúrio
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article