Issue 81, 2015

Chromogenic ‘naked eye’ and fluorogenic ‘turn on’ sensor for mercury metal ion using thiophene-based Schiff base

Abstract

2-((3-Methylthiophen-2-yl)methyleneamino)benzenethiol (Probe 1) has been synthesized and successfully applied for the selective recognition of mercury metal ions and utilized as a fluorescence turn-on sensor for Hg2+ ion via chelation enhanced fluorescence (CHEF). The mechanism of the interaction of Probe 1 with metal ions has been deduced by the absorption, emission, 1H-NMR, and MALDI-TOF Mass analysis that intimate the favourable coordination of Hg2+ metal ion by the mercapto unit. The 2 : 1 stoichiometry of the sensor complex 1 + Hg2+ was calculated from the Job’s plot based on UV-Vis absorption spectra. The binding constant (log β2) of the 1 + Hg2+ complex was found to be 13.36 by Hill plot. The limit of detection (LOD) was also calculated from the fluorescence emission titration and found to be 20 μM. Moreover the density functional theory (DFT) studies were investigated for the 1 + Hg2+ binding mechanism. Cyclic voltammograms also confirmed the recognition of Hg2+ metal ion to the Probe 1.

Graphical abstract: Chromogenic ‘naked eye’ and fluorogenic ‘turn on’ sensor for mercury metal ion using thiophene-based Schiff base

Supplementary files

Article information

Article type
Paper
Submitted
10 Jun 2015
Accepted
22 Jul 2015
First published
23 Jul 2015

RSC Adv., 2015,5, 65731-65738

Author version available

Chromogenic ‘naked eye’ and fluorogenic ‘turn on’ sensor for mercury metal ion using thiophene-based Schiff base

D. Singhal, N. Gupta and A. K. Singh, RSC Adv., 2015, 5, 65731 DOI: 10.1039/C5RA11043B

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