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<p>In this study, we present the first synthesis and comprehensive structure–property analysis of a semicarbazone pyranoquinoline (<b>PQMHC</b>) ligand and its newly developed Cu(II)-<b>PQMHC</b> complex. X-ray diffraction (XRD) reveals that Cu(II) coordination induces a complete crystalline phase transition from the orthorhombic Imma lattice of the ligand to a monoclinic P2₁/m structure in the complex, confirming the formation of a coordination-driven architecture. High-resolution transmission electron microscopy (HR-TEM) and field-emission scanning electron microscopy (FE-SEM) show that this coordination reorganizes the nanofibrous assemblies into a more compact and uniform morphology, accompanied by a reduction in fiber diameter. Diffuse-reflectance spectroscopy indicates a notable band-gap narrowing from 2.305 eV (<b>PQMHC</b>) to 1.896&#xa0;eV (complex), reflecting enhanced electronic delocalization and low-energy charge-transfer transitions due to metal coordination. Porosity analysis demonstrates that the ligand exhibits well-defined mesoporosity, whereas the Cu(II) complex shows reduced N₂ uptake, pore volume, and mesopore population, indicating densification and partial pore blockage upon complexation. Functional testing with Imazapyr-contaminated wastewater highlights a unique dual behavior: the Cu(II)-<b>PQMHC</b> complex achieves high adsorption efficiency (92%), while the free ligand exhibits superior photocatalytic degradation under UV-A and UV-C illumination. This work introduces a novel Cu(II)-<b>PQMHC</b> complex and establishes clear structure–morphology–function relationships, providing valuable insights for designing advanced materials for adsorption and photocatalytic applications.</p> Graphical Abstract <p></p>

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Correlating Structural, Morphological, and Optical Modifications of Semicarbazone Pyranoquinoline (PQMHC) and Its Cu(II) Complex for Enhanced Photocatalytic Efficiency

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月12日

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  • A. A. El-Saady,
  • Omima M. I. Adly,
  • A. A. M. Farag,
  • I. Abdelfattah,
  • Magdy A. Ibrahim,
  • M. M. El-Nahass,
  • A. M. Mansour

摘要

In this study, we present the first synthesis and comprehensive structure–property analysis of a semicarbazone pyranoquinoline (PQMHC) ligand and its newly developed Cu(II)-PQMHC complex. X-ray diffraction (XRD) reveals that Cu(II) coordination induces a complete crystalline phase transition from the orthorhombic Imma lattice of the ligand to a monoclinic P2₁/m structure in the complex, confirming the formation of a coordination-driven architecture. High-resolution transmission electron microscopy (HR-TEM) and field-emission scanning electron microscopy (FE-SEM) show that this coordination reorganizes the nanofibrous assemblies into a more compact and uniform morphology, accompanied by a reduction in fiber diameter. Diffuse-reflectance spectroscopy indicates a notable band-gap narrowing from 2.305 eV (PQMHC) to 1.896 eV (complex), reflecting enhanced electronic delocalization and low-energy charge-transfer transitions due to metal coordination. Porosity analysis demonstrates that the ligand exhibits well-defined mesoporosity, whereas the Cu(II) complex shows reduced N₂ uptake, pore volume, and mesopore population, indicating densification and partial pore blockage upon complexation. Functional testing with Imazapyr-contaminated wastewater highlights a unique dual behavior: the Cu(II)-PQMHC complex achieves high adsorption efficiency (92%), while the free ligand exhibits superior photocatalytic degradation under UV-A and UV-C illumination. This work introduces a novel Cu(II)-PQMHC complex and establishes clear structure–morphology–function relationships, providing valuable insights for designing advanced materials for adsorption and photocatalytic applications.

Graphical Abstract