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A Highly Selective Naphthalimide-Based Chemosensor: "Naked-Eye" Colorimetric and Fluorescent Turn-On Recognition of Al 3+ and Its Application in Practical Samples, Test Paper and Logic Gate.
Journal of Fluorescence 2018 January
A novel naphthalimide-based colorimetric and fluorescent turn-on chemosensor for Al3+ was synthesized and characterized with spectroscopic techniques. In MeOH solution, BPAM showed high selectivity and sensitivity to Al3+ by a 60-fold fluorescence enhancement and blue-shift absorption with visible color changes attributed to the contribution of chelation enhanced fluorescence (CHEF) and inhibition of intramolecular charge transfer (ICT). A 1:1 BPAM-Al3+ complex confirmed by job's plot and HRMS with a binding constant of 6.37 × 104 M- 1 , and the detection limit for Al3+ was as low as 1.59 × 10- 7 M. BPAM was successfully applied in real sample detection and assessing the existence of Al3+ by a colorimetric method on filter paper. Furthermore, the fluorescent signals of BPAM were designed to construct an INHIBIT molecular logic gate.
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