Fluorescence quenching of pyrene by N-hexadecyl pyridinium chloride in mixed anionic micelles

Abstract

A study of the fluorescence quenching of pyrene by N-hexadecyl pyridinium chloride in mixed micelles of sodium decyl and dodecyl sulphate, using a transient-state time-resolved fluorescence technique, enabled the determination of aggregation numbers and micellar volumes. The former vary between 49 to 65 and the latter between 16.6 and 20 dm³ mol^–1 as the mole fraction of sodium dodecyl sulphate ranges from 0 to 1. A bimolecular rate constant to account for the electron transfer interaction was determined as 1.7 × 10⁹ dm³ mol^–1 s^–1, regardless of the micellar size.