New Route to Stabilize Ruthenium Nanoparticles with Non-Isolable Chiral N-Heterocyclic Carbenes.
Ru nanoparticles (RuNPs) stabilized by non-isolable chiral N-heterocyclic carbenes (NHCs), namely SIDPhNp ((4S,5S)-1,3-di(naphthalen-1-yl)-4,5-diphenylimidazolidine) and SIPhOH ((S)-3-((1S,2R)-2-hydroxy-1,2-diphenylethyl)-1-((R)-2-hydroxy-1,2-diphenylethyl)-4,5-dihydro-3H-imidazoline), have been synthesized through a new procedure that does not require isolation of the free carbenes. The obtained RuNPs have been characterized by state-of-the-art techniques and their surface chemistry has been investigated by FTIR and solid-state MAS NMR upon the coordination of CO, which indicated the presence of free and reactive Ru sites. Their catalytic activity has been tested in various hydrogenation reactions involving competition between different sites, whereby interesting differences in selectivity were observed, but no enantioselectivity.
Laboratoire de Physique et Chimie des Nano-Objets, UMR5215 INSA-CNRS-UPS, Institut des Sciences appliquées, 135, Avenue de Rangueil, 31077 Toulouse (France).|Laboratoire de Chimie de Coordination, CNRS, 205, Route de Narbonne, 31077 Toulouse (France).
Luis Miguel
LM
Martínez-Prieto
Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149 Münster (Germany).
Angélique
A
Ferry
Laboratoire de Chimie de Coordination, CNRS, 205, Route de Narbonne, 31077 Toulouse (France).
Patricia
P
Lara
Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149 Münster (Germany).
Christian
C
Richter
Laboratoire de Chimie de Coordination, CNRS, 205, Route de Narbonne, 31077 Toulouse (France). karine.philippot@lcc-toulouse.fr.
Karine
K
Philippot
Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149 Münster (Germany). glorius@uni-muenster.de.
Frank
F
Glorius
Laboratoire de Physique et Chimie des Nano-Objets, UMR5215 INSA-CNRS-UPS, Institut des Sciences appliquées, 135, Avenue de Rangueil, 31077 Toulouse (France). chaudret@insa-toulouse.fr.
Bruno
B
Chaudret
N-heterocyclic carbenes; hydrogenation; nanoparticles; non-isolable; ruthenium