Journal
JOURNAL OF FLUORESCENCE
Volume 30, Issue 4, Pages 759-772Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10895-020-02540-z
Keywords
Hydroxyflavone; Chemosensor; Metal ions; Colorimetric; Dual response
Funding
- Science and Engineering Research Board (SERB) Govt. of India [EMR/2016/001110]
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Responsiveness of sensing materials 3-hydroxyflavone (3HF) towards metal ions in aqueous medium has been explored following photoexcitation. 3HF exhibited both colorimetric and fluorescence (FL) turn-off response towards Cu2+ and Fe2+ with high sensitivity and selectivity. Meanwhile, the distinct colour change and the rapid quenching of FL intensity provide naked-eye detection. On successive addition of Cu(2+)and Fe2+ ions, FL of 3HF was turned off, whereas there is no change in wavelength of FL bands. Quenching efficiencies for Cu(2+)and Fe2+ ions are 88% and 49%, respectively. The detection limit of the sensor towards Cu2+ and Fe2+ was 1.54 mu M and 1.98 mu M, respectively. The binding strategy between 3HF and metal ions (Cu2+, Fe2+) and the nature of quenching have been explored with the Benesi-Hildebrand and Stern-Volmer plots, respectively. The FL of 3HF significantly quenched in the presence of Cu2+ ions, and then recovered upon addition of HCl, providing the possibility of constructing a sensitive Cu2+-HCl off-on fluorescent probe. Moreover, the proposed simple, quick response and visual test strip-based chemosensor could be used for the detection of Fe2+ and Cu2+ ions.
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