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Journal of Coordination Chemistry Volume 67, 2014 - Issue 5
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Original Articles

An off-on fluorescent sensor with high selectivity and sensitivity for Fe(III)

Junmei AnState Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, PR China
,
Tianrong LiState Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, PR China
,
Baodui WangState Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, PR China
,
Zhengyin YangState Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, PR ChinaCorrespondence[email protected]
&
Mihui YanState Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, PR China
Pages 921-928 | Received 07 Sep 2013, Accepted 10 Feb 2014, Published online: 04 Apr 2014
 
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Abstract

A new fluorescent derivative (1) containing coumarin exhibits Fe(III)-selective strong yellow-green fluorescence in ethanol. This compound could be used as an “off-on” chemosensor and allow the detection of Fe3+ by monitoring changes in absorption and fluorescence spectra. Upon addition of Fe3+, an overall emission change of 125-fold was observed. High selectivity and sensitivity were observed over other metal ions, mainly due to the spirolactam ring-opening power of Fe3+. The detection limit was as low as 5.6 ppb. Photo-induced electron transfer, coupled with intramolecular charge transfer are proposed to account for the observed spectral response.

Graphical Abstract

Funding

This work is supported by the National Natural Science Foundation of China [grant number 81171337].

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