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<p>A simple protocol is reported for the hydrogenation of nitroaromatics to aniline derivatives using a silica-supported Schiff base copper complex with a magnetite core (Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>-Schiff base-Cu(II)) as a heterogeneous solid catalyst and sodium borohydride as the reducing agent. The nanostructured magnetic catalyst was comprehensively characterized using Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS), confirming the successful formation of the catalyst with well-dispersed copper complexes. The Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>-Schiff base-Cu(II) catalyst achieved quantitative reduction of nitrobenzene with 95% aniline selectivity. Furthermore, the catalyst demonstrated broad applicability by converting various nitroaromatic compounds to their corresponding aniline derivatives. The magnetic properties of the nanocatalyst enabled facile separation from the reaction mixture using an external magnetic field, allowing for five consecutive reuse cycles without significant loss of catalytic activity.</p> Graphical abstract <p></p>

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Synthesis, characterization and application of Fe3O4@SiO2-Schiff base-Cu(II) as a core-shell recyclable nano catalyst for the reduction of nitroaromatics

  • 期刊论文

  • 发表日期：

    2026年2月17日

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  • Mohammad Abdollahi-Alibeik,
  • Fatemeh Behjati Ardakani

摘要

A simple protocol is reported for the hydrogenation of nitroaromatics to aniline derivatives using a silica-supported Schiff base copper complex with a magnetite core (Fe3O4@SiO2-Schiff base-Cu(II)) as a heterogeneous solid catalyst and sodium borohydride as the reducing agent. The nanostructured magnetic catalyst was comprehensively characterized using Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS), confirming the successful formation of the catalyst with well-dispersed copper complexes. The Fe3O4@SiO2-Schiff base-Cu(II) catalyst achieved quantitative reduction of nitrobenzene with 95% aniline selectivity. Furthermore, the catalyst demonstrated broad applicability by converting various nitroaromatic compounds to their corresponding aniline derivatives. The magnetic properties of the nanocatalyst enabled facile separation from the reaction mixture using an external magnetic field, allowing for five consecutive reuse cycles without significant loss of catalytic activity.

Graphical abstract