title: Ligand effect on the catalytic activity of ruthenium nanoparticles in ionic liquids.
abstract: Suspensions of small sized (1-2.5 nm) ruthenium nanoparticles (RuNPs) have been obtained by decomposition, under H(2), of (η(4)-1,5-cyclooctadiene)(η(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][NTf(2)], and in the presence of different compounds acting as ligands: C(8)H(17)NH(2), PPhH(2), PPh(2)H and H(2)O. 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][NTf(2)] are used as catalysts for the hydrogenation of various unsaturated compounds (1,3-cyclohexadiene, limonene and styrene). It has been observed that σ-donor ligands increase the activity of the nanoparticles, contrarily to π-acceptor ones.
authors.affiliation: Université de Lyon, Institut de Chimie de Lyon, UMR CNRS-Université de Lyon 1-ESCPE Lyon, Equipe Chimie Organométallique de Surface, Villeurbanne, France.
authors.forename: Gorka
authors.initials: G
authors.lastname: Salas
authors.forename: Paul S
authors.initials: PS
authors.lastname: Campbell
authors.forename: Catherine C
authors.initials: CC
authors.lastname: Santini
authors.forename: Karine
authors.initials: K
authors.lastname: Philippot
authors.forename: Margarida F
authors.initials: MF
authors.lastname: Costa Gomes
authors.forename: Agílio A H
authors.initials: AA
authors.lastname: Pádua
mesh_terms: D002384:Catalysis; D006865:Hydrogenation; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D008024:Ligands; D053768:Metal Nanoparticles / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*; D013449:Sulfonamides / Q000737:chemistry*
chemical_list: C493485:1-butyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)amide; D007093:Imidazoles; D052578:Ionic Liquids; D008024:Ligands; D009942:Organometallic Compounds; D013449:Sulfonamides; D012428:Ruthenium