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Issue 86, 2015
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A fast-response, fluorescent ‘turn-on’ chemosensor for selective detection of Cr3+

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Abstract

A fast-response, highly selective and sensitive chemosensor, 3, for Cr3+ detection with turn-on fluorescence behavior in the physiological pH range was designed and synthesized. The chemosensor contained a combined push–pull system in which the fluorescent phenanthro[9,10-d]oxazole moiety acts as both an electron donor and a potential binding site. The electron deficient nitrile group served as an electron acceptor. A significant enhancement of fluorescence emission intensities was observed with increasing Cr3+ concentration upon excitation at 300 nm. The emission intensity reached its maximum on adding 8 equiv. of Cr3+ where the quantum yield of 3-Cr3+ was found to be 0.917, ca. 7-fold larger than chemosensor 3. The selectivity mechanism of 3 for Cr3+ was found to be based on the combined effects of the inhibition of ICT and CHEF. Remarkably the entire process was virtually complete in only 10 seconds, with a minimum detection limit for Cr3+ of 1.72 × 10−8 M−1.

Graphical abstract: A fast-response, fluorescent ‘turn-on’ chemosensor for selective detection of Cr3+

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Publication details

The article was received on 16 Jun 2015, accepted on 12 Aug 2015 and first published on 12 Aug 2015


Article type: Paper
DOI: 10.1039/C5RA11460H
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RSC Adv., 2015,5, 70302-70308

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    A fast-response, fluorescent ‘turn-on’ chemosensor for selective detection of Cr3+

    C. Fan, X. Huang, C. A. Black, X. Shen, J. Qi, Y. Yi, Z. Lu, Y. Nie and G. Sun, RSC Adv., 2015, 5, 70302
    DOI: 10.1039/C5RA11460H

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