Publication: Furan/thiophene-based fluorescent hydrazones as fluoride and cyanide sensors
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Issued Date
2019-12-01
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ISSN
10106030
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2-s2.0-85072407045
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Photochemistry and Photobiology A: Chemistry. Vol.385, (2019)
Suggested Citation
Neeraj Saini, Chidchanok Wannasiri, Supphachok Chanmungkalakul, Nicha Prigyai, Vuthichai Ervithayasuporn, Suda Kiatkamjornwong Furan/thiophene-based fluorescent hydrazones as fluoride and cyanide sensors. Journal of Photochemistry and Photobiology A: Chemistry. Vol.385, (2019). doi:10.1016/j.jphotochem.2019.112038 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/50496
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Title
Furan/thiophene-based fluorescent hydrazones as fluoride and cyanide sensors
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Abstract
© 2019 Elsevier B.V. Four dual optical signalings of fluorescent hydrazone Schiff bases were synthesized from 1,8-naphthalimide hydrazide and substituted furan and thiophene rings, employing ethanol as green solvent. All synthesized molecules can detect F− and CN− with fast response with naked eye color change and quenching of fluorescence. Most common competitive anions have paltry interferences during the optical sensing of F−, while only nitro and methyl furan substituted provided good selectivity to CN− in THF. Substituents on heterocyclic directly affect fluoride capturing sensitivity, namely, electron donating group provides more sensitivity than with electron withdrawing groups. 1H NMR confirms the H-bonding between sensor molecule and F−/CN−. The detection limits of the four-sensor molecules were found below 0.3 ppm for F− and CN− detection. The magnitude of fluorescence quenching was estimated through Stern-Volmer plots. Test strips experimentation revealed the on-site solid-state detection efficacy of the sensors. Addition of Cu(II) ions to nitro and methyl furan substituted, resulted in selective discrimination between F− and CN− in THF. Computational studies prove the agreement of reactivity for four optical molecules interaction with F− and show that substituent at furan/thiophene does not affect the sensitivity, this is contrary to traditional school of thoughts.