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Pyrene-Antipyrine based highly selective and sensitive turn-on fluorescent sensor for Th(IV)

Abstract

Turn-on fluorescent sensor for Thorium(IV) based on pyrene-antipyrine unit is described in this paper. The chemosensor {1,5-dimethyl-2-phenyl-4-[(pyren-1-ylmethylene)amino]-1H-pyrazol-3-one} PYAN exhibited weak fluorescence due to quenching by photoinduced electron transfer (PET) from the lone pair of electrons on the nitrogen atom of imine group to pyrene. The probe PYAN shows an emission maximum at 446 nm. It exhibits fluorescence enhancement with blue emission exclusively in the presence of Th(IV) in CH3CN:H2O (50:50, v/v) solution. Besides, the gradual addition of Th(IV) to PYAN induces visual color change from yellow to colorless with concomitant blue shift from 446 nm to 418 nm in fluorescence spectra. It was proposed that the blockage of PET by Th(IV) ion complexation induced emission enhancement. Recognition mechanism based on PET was confirmed by life time studies, 1H NMR titration and theoretical calculations. It was observed that 1:1 stoichiometry complex is formed between Th(IV) and PYAN with the binding constant of 4.5 x 10e4 L/mol. The limit of detection was found to be down to 4.9 nM. The probe can also be conveniently applied for the detection of Th(IV) in real samples.

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Publication details

The article was received on 31 May 2017, accepted on 09 Sep 2017 and first published on 11 Sep 2017


Article type: Paper
DOI: 10.1039/C7NJ01907F
Citation: New J. Chem., 2017, Accepted Manuscript
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    Pyrene-Antipyrine based highly selective and sensitive turn-on fluorescent sensor for Th(IV)

    K. Rani B and S. A. John, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ01907F

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