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<p>A green-synthesized europium-based metal-organic framework (Eu-ATPA@3RhB) was developed for ratiometric fluorescence sensing of Cu²⁺. Under 245&#xa0;nm excitation, Eu-ATPA@3RhB exhibits dual emission peaks at 435&#xa0;nm and 588&#xa0;nm. When Cu²⁺ is added, the fluorescence at 435&#xa0;nm is quenched while that at 588&#xa0;nm remains constant, enabling ratiometric detection based on the I<sub>435</sub>/I<sub>588</sub> ratio. The method shows a linear range of 1–25 µM (R²=0.99) with a detection limit of 0.25 µM, outperforming drinking water standards. Density functional theory (DFT) calculations elucidate the interaction mechanism between Cu²⁺ and Eu-ATPA@3RhB. The Eu-ATPA@3RhB developed in this study showcases the advantages of green synthesis, simplicity, and swiftness, affirming its potential for Cu<sup>2+</sup> detection in diverse environmental water samples.</p>

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Rational Green Synthesis of Eu MOF for Ratiometric Fluorescence Sensing Cu2+

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Yimeng Jia,
  • Mengjiao Nie,
  • Qianzhuo Lei,
  • Ying Zou,
  • Yuxin Yang,
  • Jia He,
  • Shuo Liu

摘要

A green-synthesized europium-based metal-organic framework (Eu-ATPA@3RhB) was developed for ratiometric fluorescence sensing of Cu²⁺. Under 245 nm excitation, Eu-ATPA@3RhB exhibits dual emission peaks at 435 nm and 588 nm. When Cu²⁺ is added, the fluorescence at 435 nm is quenched while that at 588 nm remains constant, enabling ratiometric detection based on the I435/I588 ratio. The method shows a linear range of 1–25 µM (R²=0.99) with a detection limit of 0.25 µM, outperforming drinking water standards. Density functional theory (DFT) calculations elucidate the interaction mechanism between Cu²⁺ and Eu-ATPA@3RhB. The Eu-ATPA@3RhB developed in this study showcases the advantages of green synthesis, simplicity, and swiftness, affirming its potential for Cu2+ detection in diverse environmental water samples.