Development of Colorimetric and Turn‐On Fluorescence Sensor for the Detection of Al³⁺ and F⁻ Ions: DNA Tracking and Practical Performance as Applications

Abstract

In this study, a new probe is designed (E)-1-(((5-mercapto-1,3,4thiadiazol-2-yl)imino)methyl)naphthalen-2-ol (NAATD) for dual colorimetric and turn-on fluorescence chemosensor. Higher selectivity and sensitivity towards Al 3 + /F À ions over other competitive ions in DMSO solution were achieved. The detection limits were found to be 3.14 nM and 9.9 nM for Al 3 + and F À ions respectively. The sensing mechanism and stoichio-metric ratio is investigated and affirmed by DFT calculations and Job's plot analysis respectively. The DNA tracking ability of the NAATD-Al 3 + is investigated by fluorescence technique which indicates that DNA efficiently bind with the probe and displace Al 3 + ions. Finally, the practical utility of the probe was successfully demonstrated by using environmental water and tooth paste samples.[a] W.