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• W2914183072 abstract "A bisimidazole ensemble (R) possessing naphthoquinone as signaling unit is synthesized and characterized using 1H and 13C NMR and LC-MS spectral techniques. Anion sensing behaviour of the receptor has been investigated using electronic and fluorescence spectral techniques. The receptor exhibits a striking colour change from yellow to brown selectively with cyanide in aqueous HEPES buffer-DMSO (1:1 v/v) medium with a detection limit of 1 μM. Job's continuous variation method suggests that the stoichiometry of the interaction is 1:2 (R:CN-). The binding constant for receptor-cyanide complex was found to be 8.7 × 102 M-1. The mechanism of detection of cyanide occurs via deprotonation of imidazole N-H protons, which is well supported by electrochemical study. DFT based theoretical calculations shows that the energy gap between HOMO and LUMO decreases from 3.3086 (in R) to 1.7799 eV (in R + CN-), which is responsible for the red-shift observed in the UV-Vis spectrum of R upon addition of cyanide ions. The present quinone-bisimidazole based receptor shows few advantages over similar bisimidazoles reported elsewhere." @default.
• W2914183072 created "2019-02-21" @default.
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• W2914183072 date "2019-04-01" @default.
• W2914183072 modified "2023-09-25" @default.
• W2914183072 title "Selective chromogenic detection of cyanide in aqueous solution – Spectral, electrochemical and theoretical studies" @default.
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• W2914183072 doi "https://doi.org/10.1016/j.saa.2019.01.074" @default.
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