A selective fluorescent chemosensor based on chromone hydrazone ligand for Zinc ions
Keywords:
Chromone hydrazone, Zn2, fluorescent probe, ONS donorAbstract
Chromone hydrazone ligand namely AFCTSC was synthesised and fully characterised using spectroscopy method of FT-IR, UV-Vis, 13C & 1H NMR. The fluorescence emission of free AFCTSC ligand was observed to be weak at 460 nm. The ligand showed high selectivity to Zn2+ by giving remarkable red shift of the emission to 505 nm, while other metal ions such as Ca2+, Co2+, Cu2+, Fe2+, Mn2+ and Ni2+ quenched the fluorescence intensity of the ligand. Furthermore, Zn2+ addition into AFCTSC solution caused fluorescent colour change from blue to green when the solution is illuminated with a UV lamp (λ=365nm). The limit of detection obtained was 4.5×10-7 M making AFCTSC a promising fluorescent probe that could be an alternative to existing analytical methods for determination of Zn2+. The binding study revealed each molecule of AFCTSC was coordinated to Zn2+ in mononegative tridentate manner via ONS donor atoms.
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