期刊
LANGMUIR
卷 30, 期 41, 页码 12130-12137出版社
AMER CHEMICAL SOC
DOI: 10.1021/la501496a
关键词
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资金
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
- Agencia Nacional de Promocion Cientifica y Tecnica
- Agencia Cordoba Ciencia
- Secretaria de Ciencia y Tecnica de la Universidad Nacional de Rio Cuarto
- CONICET
- Ministerio de Economia y Competitividad of Spain [CTQ2011-22436]
- Xunta de Galicia [PGIDIT10-PXIB209113PR, 2007/085]
- Fundacao para a Ciencia e Tecnologia (FCT, Portugal)
- POPH/FSE [SFRH/BD/60911/2009]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/60911/2009] Funding Source: FCT
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 (bmimBF(4)), 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/bmimBF(4) 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.
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