Issue 12, 2013

Highly sensitive detection of Hg2+ in aqueous solution using cationic polythiophene derivatives

Abstract

Two novel water-soluble conjugated polymers poly{3-[1-(2-trimethylammoniumacetyl)piperidine-4-methylene]thiophene-2,5-diyl chloride} (PTAPT-Cl) and poly{3-[1-(2-trimethylammoniumbutyryl)piperidine-4-methylene] thiophene-2,5-diyl chloride} (PTBPT-Cl) have been synthesized via chemical oxidative polymerization and applied as a colorimetric and fluorometric probe for the detection of metal ions. Moreover, the fluorescence detection of metal ions using previously synthesized poly[N,N,N-trimethyl-4-(thiophen-3-ylmethylene)cyclohexanaminium chloride] (PTCA-Cl) and poly[3-(1,1′-dimethyl-4-piperidinemethylene)thiophene-2,5-diyl chloride] (PDPMT-Cl) was also investigated and discussed. All four conjugated polymers exhibited high sensitivity and selectivity to Hg2+ with a fluorescence “turn-off” mode at pH 3 in aqueous solutions. The best detection limit was as low as 10−9 M without interference from other common metal ions. Consequently, the distinctive quenching of the emission bands in the presence of various metal ions can lead to qualitative and quantitative Hg2+ detection in aqueous solution by a new approach using cationic polythiophene derivatives.

Graphical abstract: Highly sensitive detection of Hg2+ in aqueous solution using cationic polythiophene derivatives

Supplementary files

Article information

Article type
Paper
Submitted
06 Aug 2013
Accepted
30 Sep 2013
First published
02 Oct 2013

New J. Chem., 2013,37, 4163-4169

Highly sensitive detection of Hg2+ in aqueous solution using cationic polythiophene derivatives

C. Guo, X. Yang, X. Wang, M. Pei and G. Zhang, New J. Chem., 2013, 37, 4163 DOI: 10.1039/C3NJ00892D

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