Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy p. 69 - 78 (2018)
Update date:2022-08-11
Topics:
Roy, Debashis
Chakraborty, Arijit
Ghosh, Rina
(E)-4-Chloro-3-[{2-(4-nitrophenyl)hydrazono}methyl]-2H-chromen-2-one (C), a coumarin derivative has been studied toward its ion sensing properties for F?, CN? and Cu2 +. A proton-transfer mechanism for F? sensing has been deduced with the help of 1H NMR titration alongwith from the changes in the absorption and emission spectra of C in the presence of F?. C formed 1:1 stoichiometric complex with each of these analytes. Sensing of C toward Cu2 + is poor, but interestingly in the presence of F? or CN? the sensing ability of Cu2 + gets enhanced many folds, and C can act as F? or CN? mediated off-on sensor for Cu2 +. Moreover, colorimetric strip (pre-coated with the coumarin derived compound) tests for F? and CN? from their DMSO solution at high temperature (~ 100 °C) opens up the door for easiest naked eye recognition and distinction of these ions, and also for naked-eye detection of F? and CN? from its aqueous solution at high temperature (~ 100 °C).
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