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A phenomenological model describing the kinetics of quenching reactions in micelles is presented. Its validity is tested by laser photolysis experiments with aqueous solutions containing micellized sodium lauryl sulfate (NaLS) solubilized pyrene as a fluorescent probe and methylene iodide or nitromethane as quenchers. The constants of the distribution equilibrium of these quenchers between NaLS micelles and water were determined as KXCH3NO2) = 1.64 X 102 M~x and KXCH2I2) = 2.5 X 103 M'1 (296°K) using the pulse radiolysis method. From the kinetic evaluation we obtain for the specific rates of association and dissociation of methylene iodide and NaLS micelles = 2.5 X 1010 M-1 sec-1 and k' = 9.5 X 10® sec-1 (296°K). Triplet lifetime measurements with solutions containing micellized cetyltrimethylammonium bromide (CTAB), anthracene, and Cu2+ ions show that the rate constant for the exit of anthracene from the CTAB micelle into the aqueous phase is as low as 2 X 102 sec-1 (296°K).

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