title: Ionic liquids entrapped in reverse micelles as nanoreactors for bimolecular nucleophilic substitution reaction. Effect of the confinement on the chloride ion availability.
abstract: In this work was explored how the confinement of two ionic liquids (ILs), 1-butyl-3-methylimidazolium chloride (bmimCl) and 1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF4), inside toluene/benzyl-n-hexadecyldimethylammonium chloride (BHDC) reverse micelles (RMs) affects the Cl(-) nucleophilicity on the bimolecular nucleophilic substitution (SN2) reaction between this anion and dimethyl-4-nitrophenylsulfonium trifluoromethanesulfonate. The results obtained show that, upon confinement, the ionic interactions between the ILs with the cationic surfactant polar head group and the surfactant counterion modify substantially the performance of both ILs as solvents. In toluene/BHDC/bmimCl RMs, the Cl(-) interacts strongly with bmim(+) (and/or BHD(+)) in such a way that its nucleophilicity is reduced in comparison with neat IL. In toluene/BHDC/bmimBF4 RMs, an ionic exchange equilibrium produces segregation of bmim(+) and BF4(-) ions, changing the composition of the RMs interface and affecting dramatically the Cl(-) availability. These results show the versatility of this kind of organized system to alter the ionic organization and influence on reaction rate when used as nanoreactors.
authors.affiliation: Departamento de Química, Universidad Nacional de Río Cuarto , Agencia Postal # 3. C.P., X5804BYA Río Cuarto, Argentina.
authors.forename: Diana
authors.initials: D
authors.lastname: Blach
authors.forename: Marcia
authors.initials: M
authors.lastname: Pessêgo
authors.forename: Juana J
authors.initials: JJ
authors.lastname: Silber
authors.forename: N Mariano
authors.initials: NM
authors.lastname: Correa
authors.forename: Luis
authors.initials: L
authors.lastname: García-Río
authors.forename: R Darío
authors.initials: RD
authors.lastname: Falcone
mesh_terms: D002712:Chlorides / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D007700:Kinetics; D008823:Micelles; D015394:Molecular Structure; D049329:Nanostructures / Q000737:chemistry*
chemical_list: D002712:Chlorides; D052578:Ionic Liquids; D007477:Ions; D008823:Micelles