AIPE-Active Neutral Ir(III) Complexes as Bi-Responsive Luminescent Chemosensors for Sensing Picric Acid and Fe<sup>3+</sup> in Aqueous Media
Three neutral iridium complexes <b>Ir1</b>–<b>Ir3</b> were synthesized using diphenylphosphoryl-substituted 2-phenylpyridine derivatives as the cyclometalating ligand and picolinic acid as the auxiliary ligand. They exhibited significant aggregation-induced phosphorescent emi...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
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| Series: | Chemosensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2227-9040/13/1/10 |
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| Summary: | Three neutral iridium complexes <b>Ir1</b>–<b>Ir3</b> were synthesized using diphenylphosphoryl-substituted 2-phenylpyridine derivatives as the cyclometalating ligand and picolinic acid as the auxiliary ligand. They exhibited significant aggregation-induced phosphorescent emission (AIPE) properties in H<sub>2</sub>O/THF and were successfully used as bi-responsive luminescent sensors for the detection of picric acid (PA) and Fe<sup>3+</sup> in aqueous media. <b>Ir1</b>–<b>Ir3</b> possesses high efficiency and high selectivity for detecting PA and Fe<sup>3+</sup>, with the lowest limit of detection at 59 nM for PA and 390 nM for Fe<sup>3+</sup>. Additionally, the complexes can achieve naked-eye detection of Fe<sup>3+</sup> in aqueous media. <b>Ir1</b>–<b>Ir3</b> exhibit excellent potential for practical applications in complicated environments. The detection mechanism for PA is attributed to photo-induced electron transfer (PET) and Förster resonance energy transfer (FRET), and the detection mechanism for Fe<sup>3+</sup> may be explained by PET and the strong interactions between Fe<sup>3+</sup> and the complexes. |
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| ISSN: | 2227-9040 |