title: Ionic liquid/oil microemulsions as chemical nanoreactors.
abstract: The phase diagram and microstructure of the ternary system ionic, liquid benzylpyridinium bis(trifluoromethanesulfonyl)imide)/nonionic surfactant (octylphenol ethoxylate)/toluene, were studied by using conductivity measurements, dynamic light scattering, pulse field gradient spin-echo NMR, and small-angle neutron scattering. Three microregions were identified by conductivity measurements according to the percolation theory. The sizes of IL-in-oil microemulsions with various IL fractions were then determined by NMR and DLS and were found to be in accordance with the radii of gyration (approximately 2 or 3 nm) determined by SANS. The reverse IL-in-oil microemulsions were used as nanoreactors to perform a Matsuda-Heck reaction between p-methoxyphenyl diazonium salt and 2,3-dihydrofurane in the presence of a palladium catalyst. The reaction yields obtained were greater in microemulsions (67%) than in bulk IL (33%), highlighting a strong effect of confinement. Moreover, a direct correlation between the quantity of IL and the reaction yield was observed.
authors.affiliation: Universite de Toulouse, UPS, IMRCP, 118 route de Narbonne, F-31062 Toulouse Cedex 9, France, and CNRS, IMRCP, F-31062 Toulouse, France.
authors.forename: Florence
authors.initials: F
authors.lastname: Gayet
authors.forename: Chaker
authors.initials: C
authors.lastname: El Kalamouni
authors.forename: Pierre
authors.initials: P
authors.lastname: Lavedan
authors.forename: Jean-Daniel
authors.initials: JD
authors.lastname: Marty
authors.forename: Annie
authors.initials: A
authors.lastname: Brûlet
authors.forename: Nancy
authors.initials: N
authors.lastname: Lauth-de Viguerie