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<p>In this work, a novel methodology has been used to synthesis Fe<sup>3+</sup>- metal complexes using aspirin as a precursor for salicylic acid ligands formed in situ. The synthesis and thorough characterization of ferric chloride-aspirin (FeCl<sub>3</sub> -acetylsalicylic acid) complex inserted into the polyvinyl alcohol (PVA) matrix have been reported. PVA based composites have been prepared with various amounts of Fe<sup>3+</sup>-metal complex utilizing casting approach. The creation of a new metal-drug complex was established by a change in the visible colour and confirmed by FTIR, which revealed the coordination of Fe3 + ions to the oxygen containing groups of the drug, and an increase in the intermolecular hydrogen bonding of the polymer matrix. UV-Vis spectroscopy indicated an enhanced absorption and a large red shift with the inclusion of the complex. The wide optical band gap of pure PVA (5.6&#xa0;eV) was successfully reduced to 1.5&#xa0;eV in the PVA-2 composite. This confirms that metal complexes play a crucial role in optical band gap tuning. The gradual increase in refractive index and dielectric constant (PVA-0 to PVA-2) is a confirmation for enhanced electronic polarizability and charge transfer. Dielectric loss also revealed interband electronic transitions and structural changes upon the formation of complex. These findings suggest a collaborative interaction of the metal, drug and polymer, which suggests that the composite has a huge potential in optoelectronic, smart sensors and UV protective applications.</p>

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Aspirin ligands as a novel approach to synthesis Fe3+-metal complexes to modify the structural and optical characterization of PVA matrix

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月26日

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  • Bahez Yasen Ahmed,
  • Khayal Kareem Ahmed,
  • Taha Yasin Ahmed,
  • Pshko A Mohammed,
  • Sara Handren Mahdi,
  • Sanbul Esmael Rasul,
  • Shujahadeen B. Aziz

摘要

In this work, a novel methodology has been used to synthesis Fe3+- metal complexes using aspirin as a precursor for salicylic acid ligands formed in situ. The synthesis and thorough characterization of ferric chloride-aspirin (FeCl3 -acetylsalicylic acid) complex inserted into the polyvinyl alcohol (PVA) matrix have been reported. PVA based composites have been prepared with various amounts of Fe3+-metal complex utilizing casting approach. The creation of a new metal-drug complex was established by a change in the visible colour and confirmed by FTIR, which revealed the coordination of Fe3 + ions to the oxygen containing groups of the drug, and an increase in the intermolecular hydrogen bonding of the polymer matrix. UV-Vis spectroscopy indicated an enhanced absorption and a large red shift with the inclusion of the complex. The wide optical band gap of pure PVA (5.6 eV) was successfully reduced to 1.5 eV in the PVA-2 composite. This confirms that metal complexes play a crucial role in optical band gap tuning. The gradual increase in refractive index and dielectric constant (PVA-0 to PVA-2) is a confirmation for enhanced electronic polarizability and charge transfer. Dielectric loss also revealed interband electronic transitions and structural changes upon the formation of complex. These findings suggest a collaborative interaction of the metal, drug and polymer, which suggests that the composite has a huge potential in optoelectronic, smart sensors and UV protective applications.