Novel Hg2+‐Specific “turn-on” fluorescence sensor: Applications in water samples and test strips via real‐time colorimetric assay

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2024-11-27 DOI:10.1016/j.jlumin.2024.121003

Nirawit Kaewnok, Pimpisa Tabphan, Jitnapa Sirirak, Krit Setthakarn, Nantanit Wanichacheva

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Abstract

Mercury pollution remains a global concern that causes harm to the environment and human health. Therefore, a rapid, sensitive, and effective method for detecting Hg²⁺ in the environment must be developed. This study successfully synthesized a new Hg²⁺-specific fluorescence sensor based on thiocarbonyl-functionalized rhodamine (TRS). The sensor exhibits drastic fluorescence enhancement and a chromogenic change toward Hg²⁺ in an aqueous methanol solution. Meanwhile, TRS can distinguish Hg²⁺ from other competing ions with a detection limit of 8.7 nM (1.7 ppb). The sensor recognizes Hg²⁺ with a 1:1 stoichiometric ratio, confirmed by Job's plot. Its sensing mechanism involves forming the Hg²⁺ complex and later desulfurization mechanism, as intensively proved by FTIR, ¹H NMR, and ¹³C NMR spectral analysis. The efficacy of TRS in colorimetric and fluorometric assays for monitoring Hg²⁺ contents was validated using different real samples. A paper test strip developed from this sensor also demonstrated high selectivity for colorimetric Hg²⁺ detection.

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.