Kinetic treatment of the reaction of m-chloroperbenzoic acid and iodide in mixed anionic/non-ionic micelles

The reaction methyl 4-nitrobenzenesulfonate + Cl − was studied in hexadecyltrimethylammonium chloride (CTAC) in the absence and presence of 0.1 M NaCl, as well as in mixed CTAC/Triton X-100 (polyoxyethylene(9.5)octylphenyl ether) aqueous micellar solutions with CTAC molar fractions of 0.9, 0.8, 0.7, and 0.6. Conductivity measurements were used to obtain critical micellar concentrations and micellar ionization degrees of the various micellar reaction media. From these data, thermodynamic information on the cationic/nonionic mixed micellar solutions was obtained. Micellar effects on the observed rate constant were explained by pseudophase kinetic models. The estimated second-order rate constants in the micellar pseudophase of the different micellar reaction media showed that pure CTAC and mixed CTAC/Triton X-100 micelles, at the high cationic surfactant molar fractions studied, provide reaction sites of similar characteristics at the interfacial region. This was in agreement with previous structural studies carried out on mixed CTAC/Triton X-100 micellar solutions. C 2002

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Study of the reaction methyl 4‐nitrobenzene‐sulfonate + Cl⁻ in mixed hexadecyltrimethyl‐ammonium chloride‐triton X‐100 micellar solutions

Fernández

Rodrı́guez

Graciani

et al. 2002

Int J of Chemical Kinetics

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Effects of non‐ionic and mixed non‐ionic–cationic micelles on the rate of aqueous cleavages of phenyl benzoate and phenyl salicylate in alkaline medium

Khan

Ismail

2004

J of Physical Organic Chem

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Pseudo‐first‐order rate constants (kobs) for the hydrolysis of phenyl salicylate (PSH) and phenyl benzoate (PB) in the alkaline medium show a monotonic decrease with the increase in [C16E20]T (total concentration of Brij 58) at constant [CH3CN] and [NaOH]. This micellar effect is explained in terms of the pseudophase model of micelles. These results show a characteristic difference between the effects of [C16E20]T and previously published effects of [C12E23]T (total concentration of Brij 35) on the rates of aqueous cleavage of PSH and PB at [CnEm]T/[NaOH]≥∼3. The values of kobs, obtained at different [C16E20]T in the presence of a constant amount of CTABr, follow the empirical relationship kobs=(k0+θK[C16E20]T)/(1+K[C16E20]T), where θ and K are empirical parameters. The values of θ are not affected whereas the values of K decrease with increase in [CTABr]T in a mixed C16E20–CTABr micellar system. The values of θ at different [CTABr]T show that θ>k0 for hydrolysis of PSH and θ<k0 for hydrolysis of PB in the presence of 0.01 M NaOH. The effects of [CTABr]T on K and θ are explained in terms of the pseudophase model of micelles coupled with the empirical relationship KS=KS0/(1+KC16E20/S[C16E20]T). Copyright © 2004 John Wiley & Sons, Ltd.

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Effects of Nonionic and Mixed Cationic–Nonionic Micelles on the Rate of Alkaline Hydrolysis of 4-Nitrophthalimide

Khan

Ismail

2001

Journal of Colloid and Interface Science

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Kinetic treatment of the reaction of m-chloroperbenzoic acid and iodide in mixed anionic/non-ionic micelles

Cited by 16 publications

References 16 publications

Study of the reaction methyl 4‐nitrobenzene‐sulfonate + Cl⁻ in mixed hexadecyltrimethyl‐ammonium chloride‐triton X‐100 micellar solutions

Study of the reaction methyl 4‐nitrobenzene‐sulfonate + Cl⁻ in mixed hexadecyltrimethyl‐ammonium chloride‐triton X‐100 micellar solutions

Effects of non‐ionic and mixed non‐ionic–cationic micelles on the rate of aqueous cleavages of phenyl benzoate and phenyl salicylate in alkaline medium

Effects of Nonionic and Mixed Cationic–Nonionic Micelles on the Rate of Alkaline Hydrolysis of 4-Nitrophthalimide

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Kinetic treatment of the reaction of m-chloroperbenzoic acid and iodide in mixed anionic/non-ionic micelles

Cited by 16 publications

References 16 publications

Study of the reaction methyl 4‐nitrobenzene‐sulfonate + Cl− in mixed hexadecyltrimethyl‐ammonium chloride‐triton X‐100 micellar solutions

Study of the reaction methyl 4‐nitrobenzene‐sulfonate + Cl− in mixed hexadecyltrimethyl‐ammonium chloride‐triton X‐100 micellar solutions

Effects of non‐ionic and mixed non‐ionic–cationic micelles on the rate of aqueous cleavages of phenyl benzoate and phenyl salicylate in alkaline medium

Effects of Nonionic and Mixed Cationic–Nonionic Micelles on the Rate of Alkaline Hydrolysis of 4-Nitrophthalimide

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Study of the reaction methyl 4‐nitrobenzene‐sulfonate + Cl⁻ in mixed hexadecyltrimethyl‐ammonium chloride‐triton X‐100 micellar solutions

Study of the reaction methyl 4‐nitrobenzene‐sulfonate + Cl⁻ in mixed hexadecyltrimethyl‐ammonium chloride‐triton X‐100 micellar solutions