Effect of 1-butanol upon Sn2 reactions in cationic micelles. A quantitative treatment

Int J of Chemical Kinetics

et al. 2004

The effects of n-hexanol, n-pentanol, and n-butanol on the critical micelle concentration (cmc), on the micellar ionization degree (α), and on the rate of the reaction methyl 4-nitrobenzenesulfonate + Br − have been investigated in cetyltrimethylammonium bromide (CTAB) aqueous solutions. An increase in the alcohol concentration present in the solution produces a decrease in the cmc and an increase in the micellar ionization degree. Kinetic data show that the observed rate constant decreases as alcohol concentration increases. This result was rationalized by considering variations in the equilibrium binding constant of the methyl 4-nitrobenzenesulfonate molecules to the micelles, variations in the interfacial bromide ion concentration, and variations in the characteristics of the water-alcohol bulk phase provoked by the presence of alcohols. When these operative factors are considered, kinetic data in this and other works show that the second-order rate constants in the micellar pseudophases of water-alcohol micellar solutions are quite similar to those estimated in the absence of alcohols. C

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Section: Discussionsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Effects of alcohols on micellization and on the reaction methyl 4‐nitrobenzenesulfonate + Br⁻ in cetyltrimethylammonium bromide aqueous micellar solutions

Muñoz

Int J of Chemical Kinetics

et al. 2004

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“…4 are the result of fitting the kinetic data by using Eq. [14]. The K m , cmc, K OH − /Br − , and α values used to obtain m OH were the same as those considered before.…”

Section: Resultsmentioning

confidence: 99%

Kinetic Micellar Effects in Tetradecyltrimethylammonium Bromide–Pentanol Micellar Solutions

Muñoz

Journal of Colloid and Interface Science

et al. 2002

“…These changes will affect several factors influencing k obs . With the aim of explaining the kinetic data the following equation will be considered [43]:…”

Section: Effects Of Alcohol Addition On the Growth Of 12-s-122br à Mmentioning

confidence: 99%

Micellization and micellar growth of alkanediyl-α,ω-bis(dimethyldodecylammonium bromide) surfactants in the presence of medium-chain linear alcohols

Journal of Colloid and Interface Science

Martı́n

et al. 2010