On the Application of the Pseudophase Model to Excited State Processes: Quenching of Pyrene by the Iodide Ion in β‐Cyclodextrin and Micellar (SDS) Solutions

Abstract

The pseudophase model, a two‐state model, is based on the assumption of the existence of an equilibrium between these two states (free and bound), which is not perturbed in the case of a reactive event. This implies that the processes in which these two states participate must be slow, in relation to the exchange processes between these states. This condition does not hold in the case of very rapid photochemical quenching processes. However, for these processes the pseudophase model is formally applicable. In this paper, a treatment that quantitatively explains this formal applicability is presented. This treatment is checked through the study of the quenching of pyrene fluorescence by the iodide ion in solutions containing β‐cyclodextrin and sodium dodecyl sulfate (SDS) micelles.