Pseudophase approach to the transfer of the nitroso group in water/AOT/SDS/isooctane quaternary microemulsions

The kinetics of the transfer of the nitroso group from N-methyl-N-nitroso-p-toluenesulfonamide to each of three secondary amines (piperazine, N-methylbenzylamine, and morpholine) was studied using a wide variety of water/sodium bis(2-ethylhexyl) sulfosuccinate (AOT)/sodium dodecyl sulfate/isooctane quaternary microemulsions as reaction media. The diverse kinetic behavior of these amines can be explained quantitatively on the basis of a single model taking into account the distribution of the amine between the aqueous and isooctane phases and their mutual interface (surfactant film); the reaction always takes place at the surfactant film. The reactivities of the amines are discussed in comparison with the behavior observed in water and in AOT/isooctane/water ternary microemulsions.