Reaction of p-Nitrophenyl Diphenyl Phosphate in Cetyltrimethylammonium Fluoride. Apparent Failure of the Pseudophase Model for Kinetics

Article abstract of DOI:10.1021/j100457a026

The reaction of F^- with p-nitrophenyl diphenyl phosphate (pNPDPP) is very rapid in aqueous solutions of cetyltrimethylammonium fluoride (CTAF).However, the results do not conform to the pseudophase ion-exchange model because the rate constant does not become constant when the substrate is fully micellar bound, but continues to increase with increasing or with addition of NaF.Added Br^- as NaBr or CTABr inhibits reaction showing that Br^- displaces F^- from the micelle.Reasons for the apparent failure of the pseudophase model are considered.