Issue 18, 2013

Determination of trace amount of Cu2+ with a multi-responsive colorimetric and reversible chemosensor

Abstract

A multi-responsive sensor 1 was constructed by combining a ferrocene unit and a rhodamine block via a carbohydrazone bond. The sensor showed high selectivity toward Cu2+ over other common metal ions in a wide pH range with excellent reversibility and rapid response. The obvious color change from colorless to pink upon the addition of Cu2+ could make it a suitable ‘naked-eye’ indicator for Cu2+. The detection limit (LOD) obtained was down to 2.0 nM and the association constant (Ka) was evaluated as 4.65 × 107 M−1. The accuracy for detecting Cu2+ in environmental river water was compared favorably with the traditional atomic absorption spectroscopy method (AAS). Finally, we proposed a reversible ring-opening mechanism (Off–On) of the rhodamine spirolactam induced by Cu2+ binding and a 2 : 1 stoichiometric structure between 1 and Cu2+.

Graphical abstract: Determination of trace amount of Cu2+ with a multi-responsive colorimetric and reversible chemosensor

Supplementary files

Article information

Article type
Paper
Submitted
13 Apr 2013
Accepted
12 Jun 2013
First published
12 Jun 2013

Analyst, 2013,138, 5274-5280

Determination of trace amount of Cu2+ with a multi-responsive colorimetric and reversible chemosensor

Y. Mi, Z. Cao, Y. Chen, Q. Xie, Y. Xu, Y. Luo, J. Shi and J. Xiang, Analyst, 2013, 138, 5274 DOI: 10.1039/C3AN00741C

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