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<p>A novel Schiff base chemosensor <b>SP1</b>, was synthesized for the detection of Cu<sup>2+</sup> ions and 2,4-dichlorophenoxyacetic acid (2,4-D). The chemosensor exhibited weak fluorescence due to the photoinduced electron transfer (PET) mechanism. Upon interaction with Cu<sup>2+</sup>, <b>SP1</b> underwent a distinct “turn-on” fluorescence response accompanied by a visible color change from yellow to orange, resulting from the formation of the <b>SP1-Cu</b><sup><b>2+</b></sup> complex, which inhibited the PET process. The complex was further utilized for the detection of 2,4-D, which led to fluorescence quenching and color recovery, enabling a dual-mode sensing approach. The detection limits were found to be 0.003 ppm for Cu<sup>2+</sup> and 0.02 ppm for 2,4-D, demonstrating high sensitivity. Additionally, <b>SP1</b> and its <b>SP1-Cu</b><sup><b>2+</b></sup> complex was evaluated for their antibacterial activity, showing promising efficacy against pathogenic bacterial strains. This dual-functional chemosensor offers a reliable and sensitive platform for both metal ion detection and environmental pollutant monitoring, with added antibacterial potential.</p>

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Multifunctional Schiff Base Chemosensor for Cu2+ and 2,4-D Sensing with Potent Antibacterial Activity

  • 期刊论文

  • 发表日期：

    2025年6月21日

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  • Faris J. Tayeb,
  • Alaa Shafie,
  • Mohammed Fareed Felemban,
  • Amal Adnan Ashour

摘要

A novel Schiff base chemosensor SP1, was synthesized for the detection of Cu2+ ions and 2,4-dichlorophenoxyacetic acid (2,4-D). The chemosensor exhibited weak fluorescence due to the photoinduced electron transfer (PET) mechanism. Upon interaction with Cu2+, SP1 underwent a distinct “turn-on” fluorescence response accompanied by a visible color change from yellow to orange, resulting from the formation of the SP1-Cu2+ complex, which inhibited the PET process. The complex was further utilized for the detection of 2,4-D, which led to fluorescence quenching and color recovery, enabling a dual-mode sensing approach. The detection limits were found to be 0.003 ppm for Cu2+ and 0.02 ppm for 2,4-D, demonstrating high sensitivity. Additionally, SP1 and its SP1-Cu2+ complex was evaluated for their antibacterial activity, showing promising efficacy against pathogenic bacterial strains. This dual-functional chemosensor offers a reliable and sensitive platform for both metal ion detection and environmental pollutant monitoring, with added antibacterial potential.