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Suzuki Reaction of Aryl Bromides Using a Phosphine-Free Magnetic nanoparticle-Supported Palladium Catalyst

催化学报 2011年第11期32卷 1667-1676页

作者： Nghia T. BUI Trung B. DANG Ha V. LE Nam T. S. PHAN Department of Chemical Engineering HCMC University of Technology VNU-HCM 268 Ly Thuong Kiet Distriet 10 Ho Chi Minh City Viet Nam

A palladium catalyst immobilized on superparaganetic nanoparticles was prepared with a palladium loading of 0.30 mmol/g. The catalyst was characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, vibrating sample magnetometry, thermogravimetric analysis, Fourier transform infrared, atomic absorption spectrophotometry, and nitrogen adsorption. The immobilized palladium catalyst was an efficient catalyst without added phosphine ligands for the Suzuki cross-coupling reaction of several aryl bromides with phenylboronic acid. The recovery of catalyst was simply by magnetic decantation in the presence of a magnet. The immobilized palladium catalyst can be reused many times without significant degradation in catalytic activity. No leaching of active palladium species into the reaction solution was detected.

关键词： superparamagnetic nanoparticle Suzuki reaction palladium aryl bromide

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Preparation of Polymer-Functionalized Iron Oxide Nanoparti-cles and Their Biomedical Properties

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Chinese Journal of Chemistry 2013年第3期31卷 401-406页

作者： Qing Lu Daixu Wei Juan Zhou Jianrong Xu Jiejun Cheng Jun Zhu Department of Radiology Shanghai Renji Hospital Shanghai Jiao Tong University School of Medicine Shanghai 200127 China National Engineering Research Center for Nanotechnology Shanghai 200241 China

superparamagnetic iron oxide nanoparticles with narrow size distributions were successfully prepared in large scale by a facile one-pot synthetic method in the presence of hydrophilic polymers, such as polyethylene glycol dia-cid （HOOC-PEG-COOH） and poly（acrylic acid）（PAA）. The as-prepared products were investigated in detail by powder X-ray diffraction （XRD）, thermogravimetric analyses （TGA）, transmission electron microscopy （TEM）, high-resolution transmission electron microscopy （HRTEM）, dynamic light scattering （DLS）, and vibrating sample magnetometer （VSM）. The interaction between polymers and iron oxide nanoparticles was investigated using Fou-rier transform infrared spectrometry （FT-IR）. The results show that polymers can be attached onto the surface of iron oxide nanoparticle by bridging coordination and monodentate fashion, respectively. The interaction affects iron oxide nanoparticle properties significantly, such as XRD diffraction intensity, hydrodynamic diameter, isoelectric point, and saturation magnetization. Furthermore, the results of in vitro experiments indicated that iron oxide-PEG-COOH nanoparticle is more cytotoxie than iron oxide-PAA nanoparticle due to different coordinating modes.

关键词： superparamagnetic nanoparticle functionalisation coordinating mode cell cytotoxicity

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