This work aimed to synthesize a new heterogeneous catalyst (SO₃H@Fe₃O₄ magnetic nanoparticles) and the study of its catalytic behavior in synthesizing 3,3′‐(arylmethylene)‐bis‐(4‐hydroxycoumarin), bis‐(indolyl)‐methane, and 1,8‐dioxo‐octahydroxanthene derivatives. The characterization of obtained material has been performed by means of Fourier‐transform infrared spectroscopy, thermogravimetric analysis, X‐ray diffraction, vibrating sample magnetometer, and transmission electron microscopy. The main properties of this new methodology, compared to earlier ones, are the short times of reaction, mild reaction conditions, simple recovery of the catalyst by permanent magnetic field, excellent yields, and reusability of the catalyst for a minimum of six runs.

中文翻译：

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非均相SO3H @ Fe3O4磁性纳米催化剂可作为合成3,3'-（芳基亚甲基）-双-（4-羟基香豆素），双（吲哚基）-甲烷和1,8-二氧代-八氢氧杂蒽衍生物的有效且可重复使用的介质

这项工作旨在合成一种新的非均相催化剂（SO ₃ H @ Fe ₃ O ₄磁性纳米粒子），并研究其在合成3,3'-（芳基亚甲基）-双-（4-羟基香豆素），双-（吲哚基）-甲烷和1,8-二氧代-八氢氧杂蒽衍生物。通过傅立叶变换红外光谱，热重分析，X射线衍射，振动样品磁力计和透射电子显微镜对获得的材料进行表征。与以前的方法相比，这种新方法的主要特性是反应时间短，反应条件温和，通过永久磁场简单回收催化剂，具有出色的收率，并且催化剂可重复使用至少六次。