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Related Experiment Video

Updated: Feb 22, 2026

IridiumIII Luminescent Probe for Detection of the Malarial Protein Biomarker Histidine Rich Protein-II
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Highly sensitive iridium(iii) complex-based phosphorescent probe for thiophenol detection.

Li Xiong1, Lin Yang, Shuai Luo

  • 1Key Laboratory of Green Chemistry and Technology (Ministry of Education), College of Chemistry, Sichuan University, Chengdu 610064, China. luzhiyun@scu.edu.cn.

Dalton Transactions (Cambridge, England : 2003)
|September 27, 2017
PubMed
Summary
This summary is machine-generated.

A novel iridium(iii) complex (Ir-DNBS) acts as a sensitive probe for detecting thiophenol. This phosphorescent probe offers rapid, selective, and highly sensitive detection in water samples.

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Area of Science:

  • Inorganic Chemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • Thiophenol is a toxic compound requiring sensitive detection methods.
  • Cyclometalated iridium(iii) complexes offer unique photophysical properties for sensing applications.

Purpose of the Study:

  • To design and synthesize a high-performance phosphorescent probe for thiophenol detection.
  • To investigate the sensing mechanism and performance of the iridium(iii) complex.

Main Methods:

  • Synthesis of a cyclometalated iridium(iii) complex (Ir-DNBS).
  • Characterization of photophysical and spectral properties.
  • Evaluation of selectivity, sensitivity, and response time for thiophenol detection.
  • Application in real water sample analysis.

Main Results:

  • Ir-DNBS exhibited a distinct phosphorescence "off-on" response to thiophenol.
  • High selectivity, sensitivity (detection limit: 2.5 nM), and fast response (10 min) were achieved.
  • The probe demonstrated high photoluminescence quantum efficiency (ΦPL = 0.21) and a long lifetime (τ = 2.07 μs).
  • Successful detection of thiophenol in actual water samples with high recovery rates.

Conclusions:

  • Ir-DNBS is a highly effective phosphorescent probe for thiophenol.
  • The probe's mechanism involves thiolate-mediated cleavage, suppressing photo-induced electron transfer.
  • The complex shows significant potential for sensitive and rapid thiophenol monitoring in environmental samples.