Journal
DALTON TRANSACTIONS
Volume 41, Issue 45, Pages 13919-13926Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2dt31644g
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Funding
- Ministere de l'Enseignement Superieur et de la Recherche, France
- EU
- ANR CALIST [ANR-07-CP2D-02-03]
- CNRS
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Suspensions of small sized (1-2.5 nm) ruthenium nanoparticles (RuNPs) have been obtained by decomposition, under H-2, of (eta(4)-1,5-cyclooctadiene)(eta(6)-1,3,5-cyclooctatriene) ruthenium(0), [Ru(COD)-(COT)], in the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide, [C(1)C(4)Im]-[ NTf2], and in the presence of different compounds acting as ligands: C8H17NH2, PPhH2, PPh2H and H2O. Previous and new liquid NMR experiments showed that the ligands are coordinated or in the proximity to the surface of the RuNPs. Herein is reported how the ligand affects the catalytic performance (activity and selectivity) compared to a ligand-free system of RuNPs, when RuNPs in [C(1)C(4)Im][NTf2] are used as catalysts for the hydrogenation of various unsaturated compounds (1,3-cyclohexadiene, limonene and styrene). It has been observed that sigma-donor ligands increase the activity of the nanoparticles, contrarily to pi-acceptor ones.
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