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Research Article

A colorimetric and fluorescence sensor based on biphenolic-dansyl derivative for specific fluoride ion detection

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Pages 151-159 | Received 04 Feb 2021, Accepted 27 Jun 2021, Published online: 19 Jul 2021
 

ABSTRACT

2ʹ-(2-((4-(methylthio)phenyl)amino)-2-oxoethoxy)-[1,1ʹ-biphenyl]-2-yl 5(dimethyl amino)naphthalene-1-sulphonate (1) was synthesised and used as a F ion sensor. The selectivity of sensor 1 with various anions (F, Cl, Br, CH3COO, C6H5COO and H2PO4) in DMSO was evaluated by 1H NMR, UV-visible and fluorescence study. For 1H NMR, an amide proton of sensor 1 disappeared due to the deprotonation reaction upon addition of F ion. On the contrary, the proton signal of HF2 emerged at 16.11 ppm. Upon addition of F ion, sensor 1 showed a new absorption band at 300 nm and the solution turned colourless. For fluorescence response, sensor 1 exhibited the enhancement of emission intensity at 434 nm with slight blue shift when titrated with F ion. These results suggest that sensor 1 possessed high sensitivity and selectivity towards F ion detection. In addition, the sensor 1 test strip coated on TLC plates and filter papers were demonstrated for specific detection F ion.

Graphical abstract

Disclosure statement

No potential conflict of interest was reported by the authors.

Conflicts of interest

The authors declare no conflict of interest.

Supplementary material

Supplemental data for this article can be accessed here.

Additional information

Funding

This research is supported by Kasetsart University Research and Development Institute, and Department of Chemistry, Kasetsart University, and the Center of Excellent for Innovation in Chemistry (PERCH-CIC), Commission on Higher Education, Ministry of Education.

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