15 research outputs found
Study of the reaction 2-(p-nitrophenyl)ethyl bromide + OH- in dimeric micellar solutions
The dehydrobromination reaction 2-(p-nitrophenyl)ethyl bromide + OH− was
investigated in several alkanediyl---bis(dodecyldimethylammonium) bromide, 12-s-
12,2Br− (with s = 2, 3, 4, 5, 6, 8, 10, 12) micellar solutions, in the presence of NaOH
5 × 10−3 M. The kinetic data were quantitatively rationalized within the whole surfactant
concentration range by using an equation based on the pseudophase ion-exchange model
and taking the variations in the micellar ionization degree caused by the morphological
transitions into account. The agreement between the theoretical and the experimental data
was good in all the dimeric micellar media studied, except for the 12-2-12,2Br− micellar
solutions. In this case, the strong tendency to micellar growth shown by the 12-2-12,2Br−
micelles could be responsible for the lack of accordance. Results showed that the dimeric
micelles accelerate the reaction more than two orders of magnitude as compared to waterConsejería de Innovación, Ciencia y Empresa de la Junta de Andalucía FQM-274and P07-FQM-03056DGCYT grant BQU2009-0747