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Development of a NIR Iridium(III) Complex-Based Probe for the Selective Detection of Iron(II) Ions.

ABSTRACT: As a commonly used metal ion, iron(II) (Fe²⁺) ions pose a potential threat to ecosystems and human health. Therefore, it is particularly important to develop analytical techniques for the rapid and accurate detection of Fe²⁺ ions. However, the development of near-infrared (NIR) luminescence probes with good photostability for Fe²⁺ ions remain challenging. In this work, we report a novel iridium(III) complex-based luminescence probe for the sensitive and rapid detection of Fe²⁺ ions in a solution based on an Fe²⁺-mediated reduction reaction. This probe is capable of sensitively detecting Fe²⁺ ions with a limit of detection (LOD) of 0.26 μM. Furthermore, this probe shows high photostability, and its luminescence remains stable under 365 nm irradiation over a time period of 30 min. To our knowledge, this is first iridium(III) complex-based NIR probe for the detection of Fe²⁺ ions. We believe that this work provides a new method for the detection of Fe²⁺ ions and has great potential for future applications in water quality testing and human monitoring.

SUBMITTER: Wang W

PROVIDER: S-EPMC11352309 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature

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Development of a NIR Iridium(III) Complex-Based Probe for the Selective Detection of Iron(II) Ions.

Wang Wanyi W Zhang Zixi Z Liu Jingqi J Kong Lingtan L Wang Wanhe W Leung Chung-Hang CH Wang Jing J

Biosensors 20240729 8

As a commonly used metal ion, iron(II) (Fe2+) ions pose a potential threat to ecosystems and human health. Therefore, it is particularly important to develop analytical techniques for the rapid and accurate detection of Fe2+ ions. However, the development of near-infrared (NIR) luminescence probes with good photostability for Fe2+ ions remain challenging. In this work, we report a novel iridium(III) complex-based luminescence probe for the sensitive and rapid det ...[more]

PMID: 39194598

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Project description:Redox-inactive metal ions that function as Lewis acids play pivotal roles in modulating reactivities of oxygen-containing metal complexes in a variety of biological and biomimetic reactions, including dioxygen activation/formation and functionalization of organic substrates. Mononuclear nonheme iron(III)-peroxo species are invoked as active oxygen intermediates in the catalytic cycles of dioxygen activation by nonheme iron enzymes and their biomimetic compounds. Here, we report mononuclear nonheme iron(III)-peroxo complexes binding redox-inactive metal ions, [(TMC)FeIII(O2)]+-M3+ (M3+ = Sc3+ and Y3+; TMC = 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane), which are characterized spectroscopically as a 'side-on' iron(III)-peroxo complex binding a redox-inactive metal ion, (TMC)FeIII-(?,?2:?2-O2)-M3+ (2-M). While an iron(III)-peroxo complex, [(TMC)FeIII(O2)]+, does not react with electron donors (e.g., ferrocene), one-electron reduction of the iron(III)-peroxo complexes binding redox-inactive metal ions occurs readily upon addition of electron donors, resulting in the generation of an iron(IV)-oxo complex, [(TMC)FeIV(O)]2+ (4), via heterolytic O-O bond cleavage of the peroxide ligand. The rates of the conversion of 2-M to 4 are found to depend on the Lewis acidity of the redox-inactive metal ions and the oxidation potential of the electron donors. We have also determined the fundamental electron-transfer properties of 2-M, such as the reduction potential and the reorganization energy in electron-transfer reaction. Based on the results presented herein, we have proposed a mechanism for the reactions of 2-M and electron donors; the reduction of 2-M to the reduced species, (TMC)FeII-(O2)-M3+ (2'-M), is the rate-determining step, followed by heterolytic O-O bond cleavage of the reduced species to form 4. The present results provide a biomimetic example demonstrating that redox-inactive metal ions bound to an iron(III)-peroxo intermediate play a significant role in activating the peroxide O-O bond to form a high-valent iron(IV)-oxo species.

Dataset Information

Development of a NIR Iridium(III) Complex-Based Probe for the Selective Detection of Iron(II) Ions.

Publications

Development of a NIR Iridium(III) Complex-Based Probe for the Selective Detection of Iron(II) Ions.

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