Solvent modulated optical tuning for discrimination of Hg2+, Zn2+ and Cu2+ ions by a coumarin-functionalized azine receptor
By: Padhan, Subrata Kumar
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Contributor(s): Rana, Punam.
Publisher: New Delhi CSIR 2021Edition: Vol.58(B), Feb.Description: 167-182p.Subject(s): GENERAL CHEMISTRYOnline resources: Click here
In:
Indian journal of chemistry (Section B)Summary: In this work, a coumarin functionalized azine receptor R has been synthesized and evaluated for its metal ion recognition capability via dual mode optical responses. The receptor exhibits a prominent colorimetric response in presence of Hg2+, Zn2+ and Cu2+ ions in acetonitrile solvent medium. While on modulating the working solvent system from acetonitrile to acetonitrile-water (9:1, v/v) medium, the receptor shows a highly selective colorimetric response only with Hg2+ ions. On the other hand, the receptor demonstrates a significant fluorogenic response through diagnostic fluorescence “turn-on” behaviour selectively with Cu2+ ions in both media. A comprehensive analysis of the binding characteristics and interference studies of receptor R with various metal ions have been carried out by colorimetric, UV-visible and fluorescence experiments. Further, 1H NMR titration studies of R with these metal ions indicate a good correlation with those of the spectroscopic experiments. The detection limit of R is found to be in the nanomolar range for Cu2+ ion while it detects Hg2+ and Zn2+ ions in micromolar range indicating a high level of sensitivity. Moreover, the analytical applications of the synthesized receptor R have been found to be excellent for optical discrimination of Hg2+, Zn2+ and Cu2+ ions via solvent modulation in real samples.
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School of Pharmacy Archieval Section | Not for loan | 2022-0296 |
In this work, a coumarin functionalized azine receptor R has been synthesized and evaluated for its metal ion recognition capability via dual mode optical responses. The receptor exhibits a prominent colorimetric response in presence of Hg2+, Zn2+ and Cu2+ ions in acetonitrile solvent medium. While on modulating the working solvent system from acetonitrile to acetonitrile-water (9:1, v/v) medium, the receptor shows a highly selective colorimetric response only with Hg2+ ions. On the other hand, the receptor demonstrates a significant fluorogenic response through diagnostic fluorescence “turn-on” behaviour selectively with Cu2+ ions in both media. A comprehensive analysis of the binding characteristics and interference studies of receptor R with various metal ions have been carried out by colorimetric, UV-visible and fluorescence experiments. Further, 1H NMR titration studies of R with these metal ions indicate a good correlation with those of the spectroscopic experiments. The detection limit of R is found to be in the nanomolar range for Cu2+ ion while it detects Hg2+ and Zn2+ ions in micromolar range indicating a high level of sensitivity. Moreover, the analytical applications of the synthesized receptor R have been found to be excellent for optical discrimination of Hg2+, Zn2+ and Cu2+ ions via solvent modulation in real samples.
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