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<p>The magnetic lumashell powder (CLP-Fe<sub>3</sub>O<sub>4</sub>) and its silica-coated form (CLP-Fe<sub>3</sub>O<sub>4</sub>@Si) nanocomposites were synthesized and characterized by FT-IR, EDS, FE-SEM and VSM techniques. The catalytic activity of both magnetic nanocomposites was investigated in the four-component synthesis if 2'-aminospiro[11H-indeno[1,2-<i>b</i>]quinoxaline-11,4'-[4H]pyran]-3'-carbonitriles from ninhydrin, active methylene-containing compounds, o-phenylenediamines and malononitrile and the results compared together. The natural foundation of these two nanocomposites is their most prominent strength, making them green, economically acceptable and environmentally friendly catalysts and suitable for industrial applications. Furthermore, the magnetic property and consequently easy separation of the catalyst from the reaction mixture, high efficiency, non-toxicity, reusability of the catalyst and mild reaction conditions are other advantages of the current methods.</p>

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Magnetic lumashell powder and silica-coated magnetic lumashell powder as natural-based nanocatalysts in multi-component reaction

  • 期刊论文

  • 发表日期：

    2026年2月7日

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  • Seyedeh Fatemeh Hojati,
  • Fatemeh Ahrari,
  • Mahsa Bahmani Mahmoud,
  • Zahra Borghebani

摘要

The magnetic lumashell powder (CLP-Fe3O4) and its silica-coated form (CLP-Fe3O4@Si) nanocomposites were synthesized and characterized by FT-IR, EDS, FE-SEM and VSM techniques. The catalytic activity of both magnetic nanocomposites was investigated in the four-component synthesis if 2'-aminospiro[11H-indeno[1,2-b]quinoxaline-11,4'-[4H]pyran]-3'-carbonitriles from ninhydrin, active methylene-containing compounds, o-phenylenediamines and malononitrile and the results compared together. The natural foundation of these two nanocomposites is their most prominent strength, making them green, economically acceptable and environmentally friendly catalysts and suitable for industrial applications. Furthermore, the magnetic property and consequently easy separation of the catalyst from the reaction mixture, high efficiency, non-toxicity, reusability of the catalyst and mild reaction conditions are other advantages of the current methods.