Palladium-coated nickel nanoclusters: new Hiyama cross-coupling catalysts

The advantages of bimetallic nanoparticles as C-C coupling catalysts are discussed, and a simple, bottom-up synthesis method of core-shell Ni-Pd clusters is presented. This method combines electrochemical and 'wet chemical' techniques, and enables the preparation of highly monodispersed st...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2006-01, Vol.8 (1), p.151-157
Main Authors: Durán Pachón, Laura, Thathagar, Mehul B, Hartl, Frantisek, Rothenberg, Gadi
Format: Article
Language:English
Subjects:
Catalysis
Electrochemistry - instrumentation
Models, Chemical
Molecular Structure
Nanostructures - chemistry
Nickel - chemistry
Organosilicon Compounds - chemistry
Palladium - chemistry
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Summary:The advantages of bimetallic nanoparticles as C-C coupling catalysts are discussed, and a simple, bottom-up synthesis method of core-shell Ni-Pd clusters is presented. This method combines electrochemical and 'wet chemical' techniques, and enables the preparation of highly monodispersed structured bimetallic nanoclusters. The double-anode electrochemical cell is described in detail. The core-shell Ni-Pd clusters were then applied as catalysts in the Hiyama cross-coupling reaction between phenyltrimethoxysilane and various haloaryls. Good product yields were obtained with a variety of iodo- and bromoaryls. We found that, for a fixed amount of Pd atoms, the core-shell clusters outperform both the monometallic Pd clusters and the alloy bimetallic Ni-Pd ones. THF is an excellent solvent for this process, with less than 2% homocoupling by-product. The roles of the stabiliser and the solvent are discussed.
ISSN:1463-9076
1463-9084
DOI:10.1039/b513587g