ABSTRACT

Mica/Fe₃O₄ nanocomposite was easily synthesized under the mild conditions and completely identified by Fourier transform infrared (FT-IR) spectra, field-emission scanning electron microscopy (FE-SEM) images, X-ray diffraction (XRD) pattern, energy-dispersive X-ray (EDX) analysis, thermogravimetric analysis (TGA) curve and vibrating sample magnetometer (VSM) curve analyses. Also, to environment-friendly, low cost and non-toxic features, this nanocomposite has unique physical and chemical properties such as magnetic separation, thermal stability and uniform size distribution. Then, the activity of mica/Fe₃O₄ magnetic nanocomposites as an efficient heterogeneous nanocatalyst was investigated in the synthesis of 2-amino-4H-chromene derivatives as an important group of organic pharmaceutical compounds. The catalyst can be separated by an external magnet and reused in numerous cycles without loss of its catalytic activity as well as maintenance of its stability. Green and highly efficient catalyst based on mica and mild reaction conditions is further advantages of the present work.

摘要

云母/ Fe ₃ O ₄纳米复合材料在温和条件下易于合成，并通过傅立叶变换红外（FT-IR）光谱，场发射扫描电子显微镜（FE-SEM）图像，X射线衍射（XRD）图案，能量色散X射线（EDX）分析，热重分析（TGA）曲线和振动样品磁力计（VSM）曲线分析。此外，具有环保，低成本和无毒的特点，这种纳米复合材料具有独特的物理和化学特性，例如磁分离，热稳定性和均匀的尺寸分布。然后，研究了云母/ Fe ₃ O ₄磁性纳米复合材料作为2-氨基-4 H的有效多相纳米催化剂的活性。-色烯衍生物作为有机药物的重要组成部分。催化剂可以通过外部磁体分离，并可以多次循环使用，而不会损失其催化活性以及保持稳定性。基于云母和温和的反应条件的绿色高效催化剂是本研究的进一步优点。