Publication: Green synthesis of fluorescent N,O-chelating hydrazone Schiff base for multi-analyte sensing in Cu<sup>2+</sup>, F<sup>−</sup> and CN<sup>−</sup> ions
2
Issued Date
2018-05-01
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10106030
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2-s2.0-85044441864
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Photochemistry and Photobiology A: Chemistry. Vol.358, (2018), 215-225
Suggested Citation
Neeraj Saini, Nicha Prigyai, Chidchanok Wannasiri, Vuthichai Ervithayasuporn, Suda Kiatkamjornwong Green synthesis of fluorescent N,O-chelating hydrazone Schiff base for multi-analyte sensing in Cu<sup>2+</sup>, F<sup>−</sup> and CN<sup>−</sup> ions. Journal of Photochemistry and Photobiology A: Chemistry. Vol.358, (2018), 215-225. doi:10.1016/j.jphotochem.2018.03.018 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/45428
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Title
Green synthesis of fluorescent N,O-chelating hydrazone Schiff base for multi-analyte sensing in Cu<sup>2+</sup>, F<sup>−</sup> and CN<sup>−</sup> ions
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Abstract
© 2018 Elsevier B.V. A colorimetric and fluorometric hydrazone Schiff's base derived from dehydroacetic acid by three-steps and high-yield syntheses under green approach employing ethanol as a solvent has been prepared. Multi-analyte sensing for both metal cation (Cu2+) and anions (F− and CN−), with high sensitivity and competitive selectivity, was encountered. The sensing mechanism of anion detection found to be deprotonation of N–H and O–H moieties in the presence of ions. However, metal cation like copper(II) ions chelation with sensor, leads to diminish intra-molecular charge transfer (ICT) with chelation induced quenching of fluorescence (CHQF). Contrary, anionic interaction ensued in heightened ICT as well as photo-induced electron transfer (PET) processes. The Job's plots interpretation rendered stoichiometry of 2:1 with Cu2+/F− and 1:1 with CN−. Moreover, the detection limits of 0.962 ppm (Cu2+), 0.023 ppm (F−) and 0.073 ppm (CN−) were much lower than WHO guidelines. Further, either water or methanol was employed to differentiate F−/CN− ions with sensor in THF, with prominent visible naked eye and fluorometric responses.