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<p>This study describes the synthesis of a new Chromium(III)-based metal-organic framework (CrMOF) with a high surface area of approximately 430&#xa0;m²/g, using captopril (CP) as a linker for the first time. The CrMOF is employed for the first time to improve the optical properties of chitosan (CS), a natural polymer. Various characterization techniques, including FTIR, UV-vis. Spectroscopy, TGA, DSC, BET, DLS, XRD, FESEM, and EDX were examined on the samples to analyze the synthesized MOF and chitosan composites’ structural, thermal, and optical properties. The Tauc method was employed to evaluate the onset optical energy band gap (OEBG) for all the films, revealing a significant reduction in the band gap from 5.5&#xa0;eV to approximately 3&#xa0;eV. The optical dielectric losses were also utilized to establish the OEBG and characterize the type of electron transition in each thin film. Furthermore, the Urbach energy (E<sub>U</sub>) was found to increase with rising CrMOF concentration from 0.4394&#xa0;to 0.9497&#xa0;eV. Our results demonstrate that incorporating CrMOF into chitosan significantly reduces the band gap, enhancing its optical properties. The doped CS films enhance the refractive index and optical dielectric constant. This innovative approach opens a new field for polymer composite fabrication, which differs from traditional filler particle methods.</p> Graphical Abstract <p></p>

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Synthesis and Characterization of a New CrMOF Using Captopril as a Linker and its Integration into Chitosan for Enhanced Optoelectronic Properties

  • 期刊论文

  • 发表日期：

    2025年4月3日

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  • Karzan A. Abdalkarim,
  • Diary I. Tofiq,
  • Shujahadeen B. Aziz

摘要

This study describes the synthesis of a new Chromium(III)-based metal-organic framework (CrMOF) with a high surface area of approximately 430 m²/g, using captopril (CP) as a linker for the first time. The CrMOF is employed for the first time to improve the optical properties of chitosan (CS), a natural polymer. Various characterization techniques, including FTIR, UV-vis. Spectroscopy, TGA, DSC, BET, DLS, XRD, FESEM, and EDX were examined on the samples to analyze the synthesized MOF and chitosan composites’ structural, thermal, and optical properties. The Tauc method was employed to evaluate the onset optical energy band gap (OEBG) for all the films, revealing a significant reduction in the band gap from 5.5 eV to approximately 3 eV. The optical dielectric losses were also utilized to establish the OEBG and characterize the type of electron transition in each thin film. Furthermore, the Urbach energy (EU) was found to increase with rising CrMOF concentration from 0.4394 to 0.9497 eV. Our results demonstrate that incorporating CrMOF into chitosan significantly reduces the band gap, enhancing its optical properties. The doped CS films enhance the refractive index and optical dielectric constant. This innovative approach opens a new field for polymer composite fabrication, which differs from traditional filler particle methods.

Graphical Abstract