Dual Detection Highly Selective Colorimetric Chemosensors for Fluoride and Copper(II) Ions Based on Imine-Phenol Derivative

Phoomirut Nusuwan1, Piyada Jittangprasert1, Mayuso Kuno1, Kem Pumsa-ard2 and Pan Tongraung1,*

1Department of Chemistry, Faculty of Science, Srinakharinwirot University, Wattana, Bangkok 10110, Thailand

2Department of Physics, Faculty of Science, Srinakharinwirot University, Wattana, Bangkok 10110, Thailand

*Corresponding author: E-mail: pan15164649@gmail.com

Abstract

A simple dual detection using colorimetric chemosensor, imine-phenol derivative L (bearing a 2-iminephenol group as a binding unit and a-nitrophenylazo group as a signaling unit), were synthesized for a high yield in two simple steps. Complexations of chemosensor L with various anions in acetonitrile solvent and other metal ions in DMSO/H2O solvent were monitored by UV-visible spectroscopy. The results indicated that the chemosensor L showed high selectivity for F and Cu2+ ions. Furthermore, the complexes for L-F and L-Cu2+ were evaluated by computational chemistry using a B3LYP/6-31G (d,p) and a B3LYP/6-311G (d,p) level of calculation. The complexes between L with F and Cu2+ were magenta and yellow colored, respectively. Chemosensor L can be applied for the analysis of F and Cu2+ ions with naked-eye detection making colour comparisons between the standard and the real sample. Most importantly, semi-qualitative detection of Cu2+ in water solution were successfully carried out with the developed test kit using chemosensor L.

Keywords

Dual detection, Colorimetric chemosensor, Cu2+ and F, Computational chemistry.

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