✦ LIBER ✦

Quenching of fluorescence from pyrene in micellar solutions by cationic quenchers

✍ Scribed by M.A.J. Rodgers; M.F. Da Silva E Wheeler

Publisher: Elsevier Science
Year: 1978
Tongue: English
Weight: 383 KB
Volume: 53
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(78)80415-1

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✦ Synopsis

The fluorescence from the St state of pyrene solubilized within the hydrophobic region of sodium dodecyl sulfate micelles has been studied as a function of concentration of some cationic additives to the aqueous phase. At concentrations of added quencher below ca_ 10v3 mol dm -3 the fluorescence decay follows a complex rate law; at long time, the decay is exponential with the same time constant as that of pyrene (S,) without added quencher. The initial slope of the decay curve depends linearly on the concentration of added cation. These results are discussed in terms of the recently proposed model which requires the water-hydrocarbon interface to penetrate the micelle in the region of the probe. An analytical treatment is presented which, on the premises stated, serves to explain the observed kinetic features.

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