Abstract

Fe₃O₄@nano-cellulose/Sb(V) as a bio-based magnetic nano-catalyst was synthesized simply through in situ co-precipitation of Fe³⁺ and Fe²⁺ ions with NH₄OH in an aqueous suspension of nano-cellulose and then treatment of resulted Fe₃O₄@nano-cellulose with antimony pentachloride in chloroform solution. The structure of this novel nano-catalyst was recognized by several analysis methods such as Fourier transform infrared spectroscopy, X-ray diffraction, vibrating sample magnetometer, field emission scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and thermo-gravimetric analysis. The potential catalytic ability was investigated in synthesis of 4H-pyrimido[2,1-b]benzothiazole derivatives via a three component reaction of aromatic aldehyde, 2-aminobenzothiazole and ethyl acetoacetate under solvent-free condition at 90 °C. Our research shows that these compounds were synthesized with high yields and purity in short reaction times. Furthermore, the obtained results indicates that Fe₃O₄@nano-cellulose/Sb(V) can be recovered easily and reused for at least three times without no significant change in the efficiency.

摘要

Fe ₃ O ₄ @纳米纤维素/Sb(V)作为生物基磁性纳米催化剂是通过在纳米水悬浮液中与NH _{4 OH原位共沉淀Fe} ³⁺和Fe ²⁺离子而合成的。 -纤维素，然后处理产生的Fe ₃ O ₄@纳米纤维素与氯仿溶液中的五氯化锑。这种新型纳米催化剂的结构通过傅里叶变换红外光谱、X射线衍射、振动样品磁力计、场发射扫描电子显微镜、透射电子显微镜、能量色散X射线光谱和热-重量分析。研究了合成4 H-嘧啶并[2,1- b ]苯并噻唑衍生物的潜在催化能力芳香醛、2-氨基苯并噻唑和乙酰乙酸乙酯在90℃无溶剂条件下的三组分反应。我们的研究表明，这些化合物在很短的反应时间内以高产率和纯度合成。此外，获得的结果表明，Fe ₃ O ₄ @纳米纤维素/Sb(V)可以很容易地回收并重复使用至少3次，而效率没有显着变化。