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VARIATION OF STERN‐VOLMER QUENCHING CONSTANTS IN MICELLAR SOLUTION AS A FUNCTION OF AQUEOUS OR MICELLAR QUENCHER
Author(s) -
Gabor Gavriella,
Turro Nicholas J.
Publication year - 1985
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1985.tb01593.x
Subject(s) - chemistry , aqueous solution , quenching (fluorescence) , critical micelle concentration , micellar solutions , micelle , fluorescence , phase (matter) , photochemistry , aqueous two phase system , bromide , inorganic chemistry , organic chemistry , physics , quantum mechanics
— The critical micelle concentration (CMC) of a fluorescent detergent may be measured by determining Stern‐Volmer quenching parameters as a function of detergent concentration. The CMC's of a cationic detergent, 11‐(3‐hexyl‐l‐indolyI)undecyltrimethylamrnoniurn bromide (6‐In‐ll+), and an anionic detergent, sodium H‐(3‐hexyI‐l‐indoiyI) undecyl sulfate (6‐In‐ll − ) were determined by this quenching procedure. Quenchers which were predominantly located in the aqueous phase (e.g. Co 2 +) or in the micellar phase (e.g. benzophenone) were employed. Aqueous phase quenchers are more effective below the CMC and cause a decrease in the long wavelength portion of the fluorescence band of the indole moiety. Quenchers located in the micellar phase are more effective above the CMC and decrease the short wavelength portion of the fluorescence band of the system.