Padhan, Subrata Kumar
Solvent modulated optical tuning for discrimination of Hg2+, Zn2+ and Cu2+ ions by a coumarin-functionalized azine receptor - Vol.58(B), Feb. - New Delhi CSIR 2021 - 167-182p.
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.
GENERAL CHEMISTRY
Solvent modulated optical tuning for discrimination of Hg2+, Zn2+ and Cu2+ ions by a coumarin-functionalized azine receptor - Vol.58(B), Feb. - New Delhi CSIR 2021 - 167-182p.
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.
GENERAL CHEMISTRY