Efficient and reusable graphene-γ-Fe2O3 magnetic nano-composite for selective oxidation and one-pot synthesis of 1,2,3-triazole using a green solvent
作者:Noor Salam、Arjyabaran Sinha、Paramita Mondal、Anupam Singha Roy、Nikhil R. Jana、Sk. Manirul Islam
DOI:10.1039/c3ra43184c
日期:——
A graphene based composite material with γ-Fe2O3 nanoparticles has been synthesized via a simple chemical route. The structure and composition of nanocomposite material have been characterized by TEM, Raman and XRD. The catalytic activity of the composite has been investigated for the oxidation reactions of sulfides and aromatic alcohols using water as the solvent. Sulfides and aromatic alcohols have been selectively oxidized to corresponding sulfoxides and aldehydes, respectively, with excellent yields. In addition this nanocomposite also serves as an efficient catalyst for one-pot synthesis of a series of 1,4-disubstituted-1,2,3-triazoles via click chemistry. The catalyst could be easily isolated from the final product by magnetic decantation (applying an external magnetic field) and can be reused without significant loss of catalytic activity.
通过简单的化学方法合成了一种基于石墨烯并含有γ-Fe2O3纳米颗粒的复合材料。利用透射电镜(TEM)、拉曼光谱(Raman)和X射线衍射(XRD)对纳米复合材料的结构和组成进行了表征。研究了该复合材料在水作为溶剂的条件下对硫化物和芳香醇氧化反应的催化活性。硫化物和芳香醇被选择性地氧化为相应的亚砜和醛,且产率优异。此外,这种纳米复合材料还可作为高效催化剂,通过点击化学实现一系列1,4-二取代-1,2,3-三唑的一锅法合成。催化剂可通过磁力倾析(施加外部磁场)从最终产物中轻松分离,并可在不显著损失催化活性下重复使用。