Architecture of multi-channel and easy-to-make sensors for selective and sensitive Hg2+ ion recognition through Hg‒C and Hg‒N bonds of naphthoquinone-aniline/pyrene union

• Published in: Journal of hazardous materials Vol. 410; p. 124597
• Main Authors: Mermer, Zeliha, Yavuz, Ozgur, Atasen, Secil Kirlangic, Alcay, Yusuf, Yilmaz, Ismail
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-05-2021
• Subjects: Colorimetric; Fluorometric; Mercury; Naphthoquinone; Sensor; Voltammetric; Voltammetric; Mercury; Fluorometric; Naphthoquinone; Sensor; Colorimetric
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2020.124597

The aim of this work is, for the first time, to develop new inexpensive, easy-to-make and multi–channel receptors, naphthoquinone-aniline/pyrene union ((Nq—An) and (Nq—Pyr)) and their Hg2+ complexes [Hg—(Nq—An)2] and [Hg—(Nq—Pyr)2] to supply an efficient solution to critical deficiencies to be encountered for Hg2+ recognition. This study is based on colorimetric, fluorometric, and voltammetric methods for determination of Hg2+ ions through Hg-C and Hg-N binding mode of the naphthoquinone-aniline/pyrene union in aqueous media. The binding mode of the receptors with Hg2+ cation was confirmed by usual characterization techniques for the synthesized Hg2+-complexes [Hg—(Nq—An)2] / [Hg—(Nq—Pyr)2] and voltammetric, 1H NMR titration experiments as well as Job’s method, indicating a 2:1 complex between the receptors and Hg2+ cation. The receptors showed a considerable color switching from orange to pink along with a red-shift of absorption wavelength, and fluorescence enhancement via the Chelation Enhanced Fluorescence effect (CHEF), and distinctive changes on the voltammogram of the electroactive naphthoquinone unit with Hg2+ cation. The experiments indicate that the sensors are highly selective and sensitive toward Hg2+ among the studied metal ions in aqueous media compared with other reported Hg2+ sensors.
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•Inexpensive and easy-to-make new sensors have been designed and prepared.•The sensors were used for sensitive/selective recognizing Hg2+ in aqueous media.•The sensors exhibit multi-channel property for determination of Hg2+.•The sensors have Hg‒C and Hg‒N binding mode of the naphthoquinone-aniline/pyrene.•The sensors have been overcome critical limitation factors to monitor Hg2+.