title: Influence of amines on the size control of in situ synthesized ruthenium nanoparticles in imidazolium ionic liquids.
abstract: Very stable suspensions of small sized (c.a. 1.2 nm) and homogeneously dispersed ruthenium nanoparticles (RuNPs) were obtained by decomposition, under H(2), of (η(4)-1,5-cyclooctadiene)(η(6)-1,3,5-cyclooctatriene)ruthenium(0), [Ru(COD)(COT)], in various imidazolium derived ionic liquids (ILs: [RMIm][NTf(2)] (R = C(n)H(2n+1) where n = 2; 4; 6; 8; 10) and in the presence of amines as ligands (1-octylamine, 1-hexadecylamine). These nanoparticles were compared to others stabilized either in pure ILs or by the same ligands in THF. NMR experiments ((13)C solution and DOSY) demonstrate that the amines are coordinated to the surface of the RuNPs. These RuNPs were investigated for the hydrogenation of aromatics and have shown a high level of recyclability (up to 10 cycles) with neither loss of activity nor significant agglomeration.
authors.affiliation: CNRS, LCC (Laboratoire de Chimie de Coordination du CNRS), 205, route de Narbonne, F-31077-Toulouse cedex 04, France.
authors.forename: Gorka
authors.initials: G
authors.lastname: Salas
authors.forename: Catherine C
authors.initials: CC
authors.lastname: Santini
authors.forename: Karine
authors.initials: K
authors.lastname: Philippot
authors.forename: Vincent
authors.initials: V
authors.lastname: Collière
authors.forename: Bruno
authors.initials: B
authors.lastname: Chaudret
authors.forename: Bernard
authors.initials: B
authors.lastname: Fenet
authors.forename: Pier Francesco
authors.initials: PF
authors.lastname: Fazzini