Abstract
We designed and synthesized a fluorescent “turn-on” and colorimetric chemosensor ((E)-1-((p-tolylimino)methyl)naphthalen-2-ol) SB. The structure of the synthesized chemosensor was investigated by 1H NMR, FT-IR, and fluorescence spectroscopy, and its sensing properties were studied toward Mn2+, Cu2+, Pb2+, Cd2+, Na+, Ni2+, Al3+, K+, Ag+, Zn2+, Co2+, Cr3+, Hg2+, Ca2+, and Mg2+. SB showed an excellent colorimetric (yellow to yellowish brown) in MeOH and fluorescence “turn-on” sensing response to Cu2+ in MeOH/Water (10/90, v/v) media. The sensing mechanism of SB toward Cu2+ was investigated by FT-IR, 1H NMR titration, DFT studies, and Job’s plot analysis. The detection limit was calculated to be very low 0.0025 µg mL−1 (0.0025 ppm). Furthermore, the test strip containing SB also showed excellent selectivity and sensitivity toward Cu2+ in a solution medium and when supported on a solid medium.
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The researchers would like to acknowledge Deanship of Scientific Research, Taif University for funding this work.
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Sikandar Khan: conceptualization, data curation and writing—original draft; Mian Muhammad: supervision and project administration; Waheed Kamran: formal analysis and conceptualization; Hamed M. Al-Saidi: investigation, resources, and data curation; Salman S. Alharthi: editing and visualization; Jari S. Algethami: validation and investigation.
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Khan, S., Muhammad, M., Kamran, A.W. et al. An ultrasensitive colorimetric and fluorescent “turn-on” chemosensor based on Schiff base for the detection of Cu2+ in the aqueous medium. Environ Monit Assess 195, 633 (2023). https://doi.org/10.1007/s10661-023-11260-3
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DOI: https://doi.org/10.1007/s10661-023-11260-3