Abstract
A simple ratiometric, turn-on chromo-fluorogenic sensor, (E)-2-((2-hydroxybenzylidiene) amino)-5-nitrophenol (HBAN), has been developed, synthesized, and characterized by several conventional analytical methods. HBAN is found to be selective for the sequential detection of Al3+ ions and picric acid (PA), respectively, based on the fluorescence ‘off-on-off’ method. A remarkable fluorescence enhancement of HBAN is detected at 540 nm upon binding with Al3+ ions with a visual yellow color fluorescence under a portable 365 nm UV light irradiation. Among the various tested nitroaromatic compounds, PA selectively quenches the fluorescence of the Al3+ ions chelated HBAN complex. The formation of the complex between HBAN and Al3+ ions is found to be in a 1:1 stoichiometric ratio, and the LOD is found to be nanomolar range. The mechanistic aspects of detecting Al3+ ions have been elucidated by different spectroscopic and density functional theoretical analyses. Additionally, a test kit based on paper strips coated with HBAN is demonstrated to selectively detect Al3+ ions.
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