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<p>Mercury is recognized as a hazardous heavy metal pollutant due to its bioaccumulative nature and high toxicity. Fluorescent ionic liquids (ILs) have emerged as promising sensing materials and have been successfully used to detect various target analytes. However, few studies have focused on real-time visual detection of trace mercury ions (Hg<sup>2+</sup>). The analysis and detection of mercury ions are of great significance for environmental and human health. To achieve real-time visual detection of Hg<sup>2+</sup> ions while ignoring background interference matrices, we have synthesized a novel phenanthroimidazolate-based pyrene pendant ILs, <b>[TTP]</b><sup><b>+</b></sup><b>[PDPI</b>]<sup><b>−</b></sup>, and studied its self-assembly behavior. The self-assembly of n[<b>TTP]</b><sup><b>+</b></sup><b>[PDPI]</b><sup><b>−</b></sup> has been utilized for the detection of Hg<sup>2+</sup> ions. The electronegativity of the nitrogen atom in its imidazolate moiety was significantly enhanced within the ILs core, leading to a marked selective increase in its affinity for Hg<sup>2+</sup> ions. Moreover, the sensor n<b>[TTP]</b><sup><b>+</b></sup><b>[PDPI]</b><sup><b>−</b></sup> has a low detection limit (in the nanomolar range, nM) and is highly responsive, making it suitable for a wide range of practical applications. The present report enables rapid, visual detection of Hg²⁺ ions, supporting the expanded use of ILs-based photonic materials for next-generation photoluminescent low-dimensional optodes in biomedical, diagnostic, environmental, and forensic applications.</p>

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A green emitting phenanthroimidazolate anionic room temperature ionic liquid and its low-dimensional materials for ultrasensitive detection of Hg2+ Ions

  • 期刊论文

  • 发表日期：

    2026年5月5日

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  • Sabbir Ahamed,
  • Sudhir Kumar Das

摘要

Mercury is recognized as a hazardous heavy metal pollutant due to its bioaccumulative nature and high toxicity. Fluorescent ionic liquids (ILs) have emerged as promising sensing materials and have been successfully used to detect various target analytes. However, few studies have focused on real-time visual detection of trace mercury ions (Hg2+). The analysis and detection of mercury ions are of great significance for environmental and human health. To achieve real-time visual detection of Hg2+ ions while ignoring background interference matrices, we have synthesized a novel phenanthroimidazolate-based pyrene pendant ILs, [TTP]+[PDPI]−, and studied its self-assembly behavior. The self-assembly of n[TTP]+[PDPI]− has been utilized for the detection of Hg2+ ions. The electronegativity of the nitrogen atom in its imidazolate moiety was significantly enhanced within the ILs core, leading to a marked selective increase in its affinity for Hg2+ ions. Moreover, the sensor n[TTP]+[PDPI]− has a low detection limit (in the nanomolar range, nM) and is highly responsive, making it suitable for a wide range of practical applications. The present report enables rapid, visual detection of Hg²⁺ ions, supporting the expanded use of ILs-based photonic materials for next-generation photoluminescent low-dimensional optodes in biomedical, diagnostic, environmental, and forensic applications.