Issue 22, 2023

A photoluminescent and electrochemiluminescent probe based on an iridium(iii) complex with a boronic acid-functionalised ancillary ligand for the selective detection of mercury(ii) ions

Abstract

Exposure to mercury(II) ions (Hg2+) can cause various diseases such as Minamata disease, acrodynia, Alzheimer's disease, and Hunter–Russell syndrome, and even organ damage. Therefore, real-time and accurate monitoring of Hg2+ in environmental samples is crucial. In this study, we report a photoluminescent (PL) and electrochemiluminescent (ECL) probe based on a cyclometalated Ir(III) complex for the selective detection of Hg2+. The introduction of a reaction site, o-aminomethylphenylboronic acid, on the ancillary ligands allowed a prompt transmetalation reaction to take place between Hg2+ and boronic acid. This reaction resulted in significant decreases of the PL and ECL signals due to the photo-induced electron transfer from the Ir(III) complex to the Hg2+ ions. The probe was applied to the selective detection of Hg2+, and the signal changes revealed a linear correlation with Hg2+ concentrations in the range of 0–10 μM (LOD = 0.72 μM for PL, 8.03 nM for ECL). The designed probe allowed the successful quantification of Hg2+ in tap water samples, which proves its potential for the selective detection of Hg2+ in environmental samples.

Graphical abstract: A photoluminescent and electrochemiluminescent probe based on an iridium(iii) complex with a boronic acid-functionalised ancillary ligand for the selective detection of mercury(ii) ions

Supplementary files

Article information

Article type
Paper
Submitted
25 יול 2023
Accepted
01 אוק 2023
First published
02 אוק 2023

Analyst, 2023,148, 5619-5626

A photoluminescent and electrochemiluminescent probe based on an iridium(III) complex with a boronic acid-functionalised ancillary ligand for the selective detection of mercury(II) ions

K. Kim, J. Oh and J. Hong, Analyst, 2023, 148, 5619 DOI: 10.1039/D3AN01266B

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