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Effects of head group size on the reaction methyl 4‐nitrobenzenesulfonate + Br − in water‐ethylene glycol cetyltrialkylammonium bromide micellar solutions
Author(s) -
Rodríguez María Amalia,
Muñoz María,
Graciani María del Mar,
Fernández Gaspar,
Moyá María Luisa
Publication year - 2007
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.20237
Subject(s) - chemistry , ethylene glycol , bromide , micelle , pulmonary surfactant , alcohol , cationic polymerization , ethylene , reaction rate constant , alkyl , micellar solutions , organic chemistry , polymer chemistry , kinetics , aqueous solution , catalysis , biochemistry , physics , quantum mechanics
The reaction methyl 4‐nitrobenzenesulfonate + Br − has been studied in water‐ethylene glycol cetyltrialkylammonium bromide (alkyl = methyl, ethyl, propyl, and butyl) micellar solutions by changing surfactant concentration as well as the weight percentage of ethylene glycol present in the bulk phase. The pseudophase model was adequate to rationalize quantitatively the micellar kinetic effects. Information about the influence of the head group size on the second‐order rate constant of the process and on the binding equilibrium constant of the organic substrate to the cationic micelles in water–ethylene glycol mixtures was obtained. Kinetic data taken from the literature were compared to those obtained in this work in order to examine the different effects produced by an alcohol that is localized in the bulk phase, such as ethylene glycol, with those caused by an alcohol that distributes between the bulk and micellar pseudophases, such as 1‐butanol. © 2007 Wiley Periodicals, Inc. Int J Chem Kinet 39: 346–352, 2007