The fluorescence quenching of pyrene solubilized in cetyltrimethylammonium chloride (CTAC) and sodium dodecyl sulfate (SDS) micelles by the surfactant nitroxyl radical 4-[N,N-dimethyl-N-(n-hexadecyl)-ammonium-2,2,6,6-tetramethyl-piperidinyl-N-oxyl chloride (1 under steady-state and transient conditions is described. The nonlinear steady-state Stern-Volmer plot and biexponential fluorescence decays are explained by a multi-step equilibrium model for the binding of 1 to the micelles. © 1978.
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