Issue 1, 2023

AIPE-active cationic Ir(iii) complexes for efficient detection of 2,4,6-trinitrophenol and oxygen

Abstract

A cationic Ir(III) complex, Ir2, with a diphenylamino (DPA)-substituted 2-phenylbenzothiazole derivative as the cyclometalating ligand was designed and synthesized. Ir2 shows obvious aggregation-induced phosphorescent emission (AIPE) in H2O/CH3CN, compared with a non-DPA-substituted Ir1. The AIPE-active Ir2 demonstrates efficient detection of 2,4,6-trinitrophenol, providing a higher quenching constant (KSV = 2 644 330 M−1vs. 73 583 M−1 for Ir1) and a lower limit of detection (LOD = 2.23 nM vs. 50.17 nM for Ir1). High-resolution mass spectrometry analysis and density functional theory calculations demonstrate that photoinduced electron transfer may be responsible for the emission quenching. Immobilized in an ethyl cellulose film, Ir2 exhibits high oxygen sensitivity (KappSV = 0.0572 Torr−1vs. 0.0090 Torr−1 for Ir1) and excellent reversibility in 10 cycles. This work reveals that the DPA group plays an important role in tuning the AIPE properties and increasing the performances of the luminescent probes.

Graphical abstract: AIPE-active cationic Ir(iii) complexes for efficient detection of 2,4,6-trinitrophenol and oxygen

Supplementary files

Article information

Article type
Paper
Submitted
02 nov. 2022
Accepted
17 nov. 2022
First published
17 nov. 2022

Dalton Trans., 2023,52, 128-135

AIPE-active cationic Ir(III) complexes for efficient detection of 2,4,6-trinitrophenol and oxygen

P. He, Y. Chen, X. Li, Y. Yan and C. Liu, Dalton Trans., 2023, 52, 128 DOI: 10.1039/D2DT03537E

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