Proton magnetic resonance spectrum of benzene molecules exchanging between surfactant micelles and water phase

Proton magnetic resonance spectra of benzene solubilized to saturation in deuterium oxide solutions of sodium dodecyl sulfate (SDS) and of trimethyldodecylammonium chloride were examined. The benzene signal did not shift until the surfactant concentration reached the critical micelle concentration, when it then began to shift abruptly. With a further increase in surfactant concentration, the signal shifted asymptotically to a definite position. The same phenomenon was observed with hydrogen oxide solutions of SDS.