Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2023 May 3;195(6):633.
doi: 10.1007/s10661-023-11260-3.

An ultrasensitive colorimetric and fluorescent "turn-on" chemosensor based on Schiff base for the detection of Cu2+ in the aqueous medium

Sikandar Khan  1 , Mian Muhammad  2 , Abdul Waheed Kamran  1 , Hamed M Al-Saidi  3 , Salman S Alharthi  4 , Jari S Algethami  5   6
Affiliations

An ultrasensitive colorimetric and fluorescent "turn-on" chemosensor based on Schiff base for the detection of Cu2+ in the aqueous medium

Sikandar Khan et al. Environ Monit Assess. .

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.

Keywords: 1H NMR titration; Chemosensor; Colorimetric; Schiff base; UV–Vis spectroscopy.

PubMed Disclaimer

References

    1. Alharbi, K. H. (2022). A review on organic colorimetric and fluorescent chemosensors for the detection of Zn (II) ions. Taylor & Francis. https://doi.org/10.1080/10408347.2022.2033611 . Accessed 11 February 2022.
    1. Al-Saidi, H. M., & Khan, S. (2022a). Recent advances in thiourea based colorimetric and fluorescent chemosensors for detection of anions and neutral analytes: a review. https://doi.org/10.1080/10408347.2022.2063017 , 1–17. https://doi.org/10.1080/10408347.2022.2063017
    1. Al-Saidi, H. M., & Khan, S. (2022b). A review on organic fluorimetric and colorimetric chemosensors for the detection of Ag(I) ions. https://doi.org/10.1080/10408347.2022.2133561 , 1–27. https://doi.org/10.1080/10408347.2022.2133561
    1. Allen, R. O., & Brookhart, W. (2002). Determination of copper in complex matrices by neutron activation analysis using X-ray detection. Analytical Chemistry, 46(9), 1297–1299. https://doi.org/10.1021/AC60345A055 - DOI
    1. Ansari, T. M., Marr, I. L., & Tariq, N. (2003). Heavy metals in marine pollution perspective–a mini review. Journal of Applied Sciences, 4(1), 1–20. https://doi.org/10.3923/jas.2004.1.20 - DOI

LinkOut - more resources