A newly synthesized thiazole derivative as a fluoride ion chemosensor: Naked-eye, spectroscopic, electrochemical and NMR studies

• New thiazole derivative have been synthesized and characterized.
• Complexation behaviors for various anionic species investigated.
• It is a very good naked eye detection sensor for the fluoride anion.

2,3-Indoledione 3-thiosemicarbazone (TSCI) and a novel compound 3-(2-(4-(4-phenoxyphenyl)thiazol-2-yl)hydrazono)indolin-2-one (FTHI) were synthesized with high yield and characterized by spectroscopic techniques. The complexation behaviors of TSCI and FTHI for various anionic species (F−, Cl−, Br−, I−, NO2-, NO3-, BzO−, HSO4-, ClO4-) in CH3CN were investigated and compared by UV–vis spectroscopy, cyclic voltammetry and 1H NMR titration techniques. FTHI showed high degree of selectivity for fluoride over other anions. This selectivity could be easily observed by the naked eye, indicating that FTHI is potential colorimetric sensor for fluoride anion.

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