Neeraj SainiChidchanok WannasiriSupphachok ChanmungkalakulNicha PrigyaiVuthichai ErvithayasupornSuda KiatkamjornwongChulalongkorn UniversityMahidol UniversityFRS(T)2020-01-272020-01-272019-12-01Journal of Photochemistry and Photobiology A: Chemistry. Vol.385, (2019)101060302-s2.0-85072407045https://repository.li.mahidol.ac.th/handle/20.500.14594/50496© 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.Mahidol UniversityChemical EngineeringChemistryArticleSCOPUS10.1016/j.jphotochem.2019.112038