Journal
CHEMCATCHEM
Volume 5, Issue 6, Pages 1497-1503Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201200718
Keywords
cyclodextrins; heterogeneous catalysis; hydrogenation; nanoparticles; ruthenium
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Funding
- CNRS
- Agence Nationale de la Recherche [ANR-09-BLAN-0194]
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Colloidal suspensions of ruthenium nanoparticles (Ru0 NPs) stabilized by randomly methylated -cyclodextrins were easily prepared in aqueous solution by two comparative reductive approaches. The first method relies on a one-step hydrogen reduction of ruthenium trichloride as a metal precursor in the presence of cyclodextrins (one-pot method). The second method consists of the chemical reduction of metal salts by NaBH4, followed by the stabilization of ruthenium NPs by post-addition of the methylated -cyclodextrins (cascade method). The modified -cyclodextrin-capped ruthenium NPs obtained were characterized using TEM, DLS, and NMR techniques. The highly dispersed colloidal suspensions contain very small particles in the size range of 1-1.4nm. Their catalytic performances were investigated in terms of activity and selectivity of their biphasic hydrogenation of various substrates (olefins, ketones, and disubstituted arenes) under mild conditions.
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