Selective Detection of Picric Acid by Benzodiazepine Containing Enaminone Core as Receptor and Its Application to Real Water Sample Analysis.

Autor: Eswaran R; Department of Chemistry, The Gandhigram Rural Institute - Deemed to be University, Gandhigram, Dindigul, Tamilnadu, 624302, India., Selvaraj L; Department of Chemistry, The Gandhigram Rural Institute - Deemed to be University, Gandhigram, Dindigul, Tamilnadu, 624302, India., Ramasamy S; Department of Chemistry, The Gandhigram Rural Institute - Deemed to be University, Gandhigram, Dindigul, Tamilnadu, 624302, India., Gandhi S; Department of Chemistry, The Gandhigram Rural Institute - Deemed to be University, Gandhigram, Dindigul, Tamilnadu, 624302, India., Muthu SP; Department of Chemistry, The Gandhigram Rural Institute - Deemed to be University, Gandhigram, Dindigul, Tamilnadu, 624302, India. mspchem99@gmail.com.
Jazyk: angličtina
Zdroj: Journal of fluorescence [J Fluoresc] 2024 Oct 01. Date of Electronic Publication: 2024 Oct 01.
DOI: 10.1007/s10895-024-03925-0
Abstrakt: Nitroaromatic compounds are highly explosive and illegitimate substances. Over a decade, chemists have been affianced in extensive research on the selective and sensitive detection of these nitroaromatic explosives for homeland security and environmental protection. The benzodiazepine-based enaminone (BDE) receptor has been synthesized by aqueous extract of onion catalyzed three-component reaction between o-phenylenediamine, dimedone with an aldehyde. The BDE probe is well analyzed and applied to a sensor that selectively detects picric acid (PA). UV-Vis and fluorescence spectroscopy were used to investigate the photophysical responses of the receptor (BDE). From the observed results BDE found turn-off fluorescence with the addition of picric acid and the lowest limit of detection and limit of quantification was achieved about 24.6 nM and 73.8 nM. The fluorescence quantum yield was attained about 0.28. The BDE-PA adduct formation was confirmed by 1 H NMR titration analysis. The Job's plot analysis was performed through 1 H NMR titrations and established the binding stoichiometry ratio of the BDE-PA adduct as 1:1 ratio. Further, DFT calculations supported the observed photophysical responses of BDE-PA adduct to confirm the molecular level interactions. The receptor was effectively applied to approximate level of picric acid in real water sample analysis.
(© 2024. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)
Databáze: MEDLINE
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