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Nanomolar Hg detection via phenothiazine fluorogenic chemosensor: Applications in water analysis and intracellular imaging. | LitMetric

Nanomolar Hg detection via phenothiazine fluorogenic chemosensor: Applications in water analysis and intracellular imaging.

Spectrochim Acta A Mol Biomol Spectrosc

Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India. Electronic address:

Published: February 2025

A Knoevenagel condensation reaction paved the way for the development of the PTZ-BCN probe namely (z)-2-(1H-benzo[d]imidazole-2-yl)-3-(10-ethyl-10H-phenothiazin-3-yl) acrylonitrile. PTZ-BCN's spectral characteristics were verified through the application of IR, H NMR, C NMR, and HRMS techniques. The PTZ-BCN probe showed a high selectivity and sensitivity toward Hg ions over other interfering competing metal ions in CHCN: HEPES buffer (9:1, v/v) system. The addition of Hg results in a notable redshift and fluorescence quenching of the PTZ-BCN probe. An examination of the interaction between the PTZ-BCN probe and Hg involved recoding H NMR titration spectra, HRMS, DFT analysis, and Job's plot respectively. Quantification of the lowest detectable Hg concentration at 2.3 nM, exhibiting a correlation coefficient of R = 0.9985. PTZ-BCN probe has proven effective in quantitatively determining the existence of Hg in real-time water samples, test strips, solid state, and Hela living cells.

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http://dx.doi.org/10.1016/j.saa.2024.125157DOI Listing

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