催化作用
纳米复合材料
化学
镍
核化学
动态光散射
纳米颗粒
透射电子显微镜
化学工程
材料科学
纳米技术
有机化学
工程类
作者
Akram Taghizadeh,Nader Noroozi Pesyan,Hassan Alamgholiloo,Golaleh Sheykhaghaei
摘要
The development of green‐based nanostructures is extremely compelling for their implementation in the catalytic arena. In this study, a new type of magnetically core‐shell nanocomposite was successfully designed to be used as a green catalyst for the synthesis of 2,3‐dihydroquinazolin‐4(1 H )‐ones under ultrasonic irradiation. Initially, magnetic Fe 3 O 4 nanoparticle (NP) cores were fabricated via the co‐operation method and subsequently coated with polyethylene glycol (PEG). After that, the macro‐bicyclic Kryptofix 222 (KP222) functionalized on the surface of Fe 3 O 4 @PEG for graft and stabilization of nickel metal. The obtained Ni@KP222/Fe 3 O 4 @PEG nanocomposite was characterized by FT‐IR (Fourier Transform Infrared), wide‐angle XRD (X‐ray Powder Difraction), FESEM (Field Emiossion Scanning Electron Microscopy), TEM (Transmission Electron Microscopy), VSM (Vibrating‐Sample Magnetometer), TGA‐DTA (Thermogravimetrtic Analysis‐ Differential Thermal Analysis), DLS (Dynamic Light Scattering), and BET (Brunauer–Emmett–Teller) spectroscopy and technique. The findings indicated that high‐affinity KP222 ligand in the stabilization of Ni 2+ and ultrasound irradiation catalyzed synergistically the formation of the 2,3‐dihydroquinazolin‐4(1 H )‐ones. The benzaldehydes with electron‐withdrawing and electron donor groups could react well with the amino benzamide under ultrasound irradiation in 5 min, indicating that the reaction was not sensitive to the electronic effects. Furthermore, the reusability test for the Ni@KP222/Fe 3 O 4 @PEG catalyst revealed successful recyclability for six runs. The current study provided a rational design and synthesis of multifunctional catalysts for catalytic applications.
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