Issue 9, 2012

A highly selective and naked-eye sensor for Hg2+ based on quinazoline-4(3H)-thione

Abstract

A highly selective colorimetric and fluorescent sensor for Hg2+, TPS (TPS = 2-(4-(diphenyl-amino)phenyl)quinazoline-4(3H)-thione), based on a 2-substituted quinazoline-4(3H)-thione derivative, was designed and characterized in this paper. TPS displays relatively strong fluorescence centered at about 468 nm. When mixing with Hg2+, TPS interacts with Hg2+ in a 2 : 1(TPS-Hg2+) stoichiometry via a coordination bond interaction between the sulfur atom and Hg2+ with an association constant of 4.17 × 108 M−2 (R2 = 0.96). Upon addition of Hg2+, TPS showed a remarkable decrease in fluorescence spectra (468 nm) with a clear color change from yellow to red, so TPS could serve as a naked-eye sensor for Hg2+. The sensor allow determination of Hg2+ in the working range 2.0 μM–12.0 μM with a detection limit of 1.5 μM. Upon addition of KI to the solution of TPS-Hg2+ species, the spectra can be restored to the original spectrum in both absorption and fluorescence and indicates that this sensor could be reused. The sensor exhibited excellent reproducibility, reversibility and selectivity.

Graphical abstract: A highly selective and naked-eye sensor for Hg2+ based on quinazoline-4(3H)-thione

Supplementary files

Article information

Article type
Paper
Submitted
17 May 2012
Accepted
21 Jun 2012
First published
22 Jun 2012

New J. Chem., 2012,36, 1879-1883

A highly selective and naked-eye sensor for Hg2+ based on quinazoline-4(3H)-thione

Q. Mei, L. Wang, B. Tian, F. Yan, B. Zhang, W. Huang and B. Tong, New J. Chem., 2012, 36, 1879 DOI: 10.1039/C2NJ40400A

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