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<p>Under solvothermal reaction conditions, a freshly designed Zn(II)-bearing coordination polymer, {[Zn<sub>2</sub>(H<sub>2</sub>O)<sub>5</sub>(DODDA)]·H<sub>2</sub>O·DEA}<sub>n</sub> (denoted as CP 1), was successfully prepared from the multifunctional pyridazine‑tetracarboxylic acid ligand H<sub>4</sub>DODDA. According to single-crystal X-ray diffraction data, CP 1 adopts a two-dimensional layered architecture, and the overall supramolecular assembly is further reinforced through extensive hydrogen‑bonding interactions revealed by Hirshfeld surface analysis. In aqueous media, CP 1 exhibits stable and intense luminescence behavior. Fluorescence-based sensing investigations reveal that this material can function as a highly selective bifunctional fluorescent probe for Cu<sup>2+</sup> ions and tetracycline antibiotics through an emission‑quenching process. The calculated detection limits for Cu<sup>2+</sup> and TC are 0.773 µmol and 0.065 µmol, respectively. These findings suggest that CP 1 possesses promising application potential for simultaneous monitoring of heavy‑metal contaminants and antibiotic residues in environmental systems.</p>

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A Zn(II) Coordination Polymer Assembled from Pyridazine-Tetracarboxylate: Single-Crystal X-ray Structure, Hirshfeld Surface Analysis, and Bifunctional Fluorescence Sensing Toward Cu²⁺ and Tetracycline

  • 期刊论文

  • 发表日期：

    2026年6月27日

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  • Youning Hu,
  • Dongfeng Zhao,
  • Miaomiao Zhou,
  • Shiguo Gu,
  • Jingjing Hu

摘要

Under solvothermal reaction conditions, a freshly designed Zn(II)-bearing coordination polymer, {[Zn2(H2O)5(DODDA)]·H2O·DEA}n (denoted as CP 1), was successfully prepared from the multifunctional pyridazine‑tetracarboxylic acid ligand H4DODDA. According to single-crystal X-ray diffraction data, CP 1 adopts a two-dimensional layered architecture, and the overall supramolecular assembly is further reinforced through extensive hydrogen‑bonding interactions revealed by Hirshfeld surface analysis. In aqueous media, CP 1 exhibits stable and intense luminescence behavior. Fluorescence-based sensing investigations reveal that this material can function as a highly selective bifunctional fluorescent probe for Cu2+ ions and tetracycline antibiotics through an emission‑quenching process. The calculated detection limits for Cu2+ and TC are 0.773 µmol and 0.065 µmol, respectively. These findings suggest that CP 1 possesses promising application potential for simultaneous monitoring of heavy‑metal contaminants and antibiotic residues in environmental systems.