Abstract
A 2,6-diformyl-p-cresol (DFC)-4-amino antipyrine (AP) based dual signaling fluorescent Schiff base ligand (DFCAP) is found to exhibit colorimetric and fluorescence turn on selective sensing towards metal ions, Zn2+ and Al3+. It also exhibits a significant aggregation induced emission (AIE) phenomenon by controlling the water–THF solvent ratio which provides robust green emissive fluorogenic aggregates with well-defined morphologies. Turn-on fluorescence enhancements as high as 195 fold and 168 fold in methanol for Al3+ and Zn2+ at 480 nm and 508 nm, respectively, were noticed. The binding constants and stoichiometry determined from the fluorescence titration data are K = 7.63 × 104 M−1 and 3.42 × 104 M−1 and 1:1 complexation for both Al3+ and Zn2+ respectively, supported by Job’s method. DFCAP shows high sensitivity towards the detection of Zn2+ and Al3+ ions with very low detection limit values of ca. ~21 nM and 30 nM respectively. Besides by applying its attractive AIE feature, the green emissive hydrosol functions as a good chemosensor with high sensitivity for a selected explosive TNP through ground state complexation with a LOD value of ca. ~1.74 µM and especially a high Stern–Volmer quenching constant of ca. ~4.14 × 105 M−1. For instant ‘naked eye’ response for the trace detection of TNP in the solution state, we fabricated a simple paper strip that could detect TNP on-site in a fast, inexpensive and simple way.
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Electronic supplementary information (ESI) available: Additional details of a FT-IR study, 1H NMR study, quantitative determination results and also the detailed characterization data to establish the sensory and AIE behavior of DFCAP. See DOI: 10.1039/c9pp00226j
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Dey, S., Maity, A., Shyamal, M. et al. An antipyrine based fluorescence “turn-on” dual sensor for Zn2+ and Al3+ and its selective fluorescence “turn-off” sensing towards 2,4,6-trinitrophenol (TNP) in the aggregated state. Photochem Photobiol Sci 18, 2717–2729 (2019). https://doi.org/10.1039/c9pp00226j
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DOI: https://doi.org/10.1039/c9pp00226j