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Ultra-Small Nano-Palladium on Giant Magnetic Nanoparticles
Z. Yinghuai, S. Chee Peng, A. Emi, S. Zhenshun, Monalisa, R. A. Kemp
Institute of Chemical and Engineering Sciences and National University of Singapore, Singapore; University of New Mexico and Sandia National Laboratories, Albuquerque, USA
22 November 2007 (online)
Commercially available magnetic iron oxide particles matrixed with starch (Æ ∪100 nm) (A) were treated with POCl3 to afford the phosphate functional group enriched particles B. The phosphate-enriched magnetic particles were added to an aqueous solution of Pd(acac)2 to form reddish-brown particles C. The Pd(II) supported by magnetic particles was reduced with ethylene glycol under thermal conditions to give black magnetic particles D. The resulting particles D bearing ultra-small palladium nanoparticles catalyzed the Suzuki-Miyaura coupling of PhBr and PhB(OH)2 as well as the Heck reaction of PhBr and styrene.