✦ LIBER ✦

Micellar effect upon the reaction of hydroxide ion with coumarin

✍ Scribed by A. Malpica; M. Calzadilla; H. Linares

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 106 KB
Volume: 30
Category: Article
ISSN: 0538-8066
DOI: 10.1002/(sici)1097-4601(1998)30:4<273::aid-kin5>3.0.co;2-p

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✦ Synopsis

Cationic micelles of cetyltrimethylammonium bromide, CTABr, speed attack of hydroxide ion upon coumarin by a factor of c.a-2, due to a concentration effect. The first-order rate constants, at a given hydroxide ions concentration go through maxima with increasing k , obs surfactant concentration. The overall micellar effects in these cationic micelles can be treated in terms of the pseudo-phase ion exchange model. Analysis of the data shows that secondorder rate constant at the micellar surface is smaller than the second-order rate constant in water. Anionic micelles of sodium dodecyi sulfate, SDS, inhibit the same reaction.

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