New Fluorescence Method for the Determination of the Critical Micelle Concentration by Photosensitive Monoazacryptand Derivatives

摘要: A novel fluorescence method for the determination of critical micelle concentration (cmc) is reported. The cmc values nonionic and anionic surfactants were evaluated utilizing a photosensitive monoazacryptand−Ba2+ complex, whose intensity sensitively changed by environmental conditions based on photoinduced electron transfer (PET) mechanism as fluorescent probe (PET method). Based comparison obtained PET versus those conventional fluorescence-based methods well reported in literature, one can conclude that useful determination. In particular, was more effective with very low (<10-5 M) than any other method. cases surfactants, revealed formation premicellar aggregates comprised surfactant molecules probes below cmc. More...