DISTRIBUTION OF FLUOROCARBON QUENCHER AMONG MICELLES VIA PYRENE FLUORESCENCE PROBE METHOD

Fluorescence-quenching of pyrene in micellar system has been investiga ted using 1,1,2,2-tetrahydroheptadecafluorodecylpyridinium chloride (H FDePC). The new fluorocarbon quencher has a similar quenching ability as hexadecylpyridinium chloride (CPC) towards pyrene in hydrocarbon mi celles if only a quencher molecule is solubilized in a micelle. The fl uorocarbon quencher randomly distributed among micelles if the average occupancy number of probes per a micelle was small enough. The fluore scence behavior of pyrene was examined for hexadecyltrimethylammonium chloride (CTAC) and HFDePC mixtures. The variation of fluorescence int ensity gave second cmc, reflecting the micellar immiscibility of fluor ocarbon and hydrocarbon surfactants. The second cme can be simulated b y material balances of both surfactants supposing the coexistence of t wo kinds of mixed micelles. The fluorescence-quenching behavior sugges ted the enhanced micellar immiscibility probably due to nonrandom dist ribution of fluorocarbon quenchers among micelles.