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Issue 39, 2017
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Highly sensitive iridium(III) complex-based phosphorescent probe for thiophenol detection

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Abstract

A cyclometalated iridium(III) complex (Ir-DNBS) was designed and synthesized as a high-performance phosphorescent thiophenol probe. Ir-DNBS displays a distinct phosphorescence “off–on” response toward thiophenol with high selectivity, high sensitivity (detection limit: 2.5 nM) and fast response (10 min). It is noteworthy that the signaling phosphore of Ir-DNBS possesses relatively high photoluminescence quantum efficiency (ΦPL = 0.21) together with relatively long lifetime (τ = 2.07 μs), indicative of its potential in achieving high temporal resolution. Ir-DNBS is also applicable to the detection of thiophenol in actual water samples with high recovery rate. Photophysical and spectral characterization results revealed that the probing mechanism of Ir-DNBS toward thiophenol lies in the thiolate-mediated cleavage reaction, resulting in suppressed photo-induced excited state electron transfer process in the reaction product.

Graphical abstract: Highly sensitive iridium(iii) complex-based phosphorescent probe for thiophenol detection

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Publication details

The article was received on 22 Jun 2017, accepted on 13 Sep 2017 and first published on 13 Sep 2017


Article type: Paper
DOI: 10.1039/C7DT02263H
Citation: Dalton Trans., 2017,46, 13456-13462
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    Highly sensitive iridium(III) complex-based phosphorescent probe for thiophenol detection

    L. Xiong, L. Yang, S. Luo, Y. Huang and Z. Lu, Dalton Trans., 2017, 46, 13456
    DOI: 10.1039/C7DT02263H

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