Journal of Physical Chemistry p. 5875 - 5878 (1990)
Update date:2022-08-11
Topics:
Bertoncini, Clelia R. A.
Nome, Faruk
Cerichelli, Giorgio
Bunton, Clifford A.
Observed first-order rate constants for reaction of methyl naphthalene-2-sulfonate (2-MeONs) with Br- in cetyltrimethylammonium and cetyltriethylammonium bromides (CTABr and CTEABr) are decreased by addition of 1-butanol.The inhibition can be treated quantitatively in terms of a pseudophase model in which the rate constant at the micellar surface follows the mole ratio of bound Br- to micellized surfactant and bound 1-BuOH.The second-order rate constants in the micellar pseudophase, kM, are independent of <1-BuOH> in the range 0-0.9 M.Conductometry and NMR line widths of 81Br- show that the alcohol reduces micellar binding of Br-, and spectral absorbance shows that binding of 2-MeONs is also reduced.
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