Spectrofluorimetric determination of magnesium ions in water, ampoule, and suspension samples using a fluorescent azothiazol-benzenesulfonamide derivative.

In this study, a fluorescence azothiazol-benzenesulfonamide derivative (M-sensor) was prepared for the determination of Mg 2+ ions in different samples. The utilized M-sensor exhibited an emission fluorescence activity at 587 nm upon excitation at 537 nm. The developed method was based on the quenching effect of Mg 2+ ions on the fluorescence intensity of the M-sensor with the above-mentioned fluorescence features. Furthermore, the utilized M-sensor was complexed with Mg 2+ ions in the molar ratio of 1:1 (Mg 2+ to M-sensor) and the selectivity of M-sensor toward Mg 2+ against other metals ions, and the reversibility and reusability of the sensor were studied and verified. After optimization of the fluorometric detection, the quenching effect was directly proportional to the increase in the concentration of Mg 2+ in the linear range 100-600 ng ml -1 with a limit of detection value of 18 ng ml -1 . The fluorescence sensor was successfully applied with good recovery for the determination of Mg 2+ in water samples and different pharmaceutical samples (ampoules and suspension) without any interference from aluminium.