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Study of the S N 2 Substitution Reactions Between Methyl Naphtalene‐2‐Sulfonate and Methyl 4‐Nitrobenzene Sulfonate and Bromide Ions in Dodecyl Dibromide Dimeric Micellar Solutions in the Absence and Presence of Alcohols
Author(s) -
Mar Graciani María,
Rodríguez Amalia,
Martín Victoria Isabel,
Moyá María Luisa
Publication year - 2012
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-011-1300-5
Subject(s) - chemistry , sulfonate , bromide , pulmonary surfactant , nitrobenzene , micelle , medicinal chemistry , inorganic chemistry , micellar solutions , ion , cationic polymerization , photochemistry , organic chemistry , catalysis , aqueous solution , sodium , biochemistry
The S N 2 substitution reactions between methyl naphthalene‐2‐sulfonate and methyl 4‐nitrobenzenesulfonate with bromide ions were studied in alkanediyl‐α,ω‐bis(dimethyldodecylammonium) bromide, 12‐ s ‐12,2Br − ( s = 3, 4, 6), micellar solutions in the absence and in the presence of alcohols. The observed rate constant for the two processes was found to be sensitive to changes in micellar characteristics caused by the presence of alcohols. At high surfactant concentrations, kinetic data made evident the sphere‐to‐rod transition accompanying the increase in the dimeric surfactant concentration in all the micellar reaction media investigated. Kinetic results were quantitatively rationalized within the whole surfactant concentration range, below and above the second CMC, by using a new treatment based on the pseudophase kinetic model.