Luminescence decay of hydrophobic molecules solubilized in aqueous micellar systems. A kinetic model

Journal Article · Wed Jan 17 04:00:00 EST 1973 · J. Phys. Chem., v. 78, no. 2, pp. 190-195

OSTI ID:4344368

Infelta, P P; Graetzel, M; Thomas, J K

A phenomenological model describing the kinetics of quenching reactions in micelles is presented. Its validity is tested by laser photolyste experiments with aqueous solutions containing micellized sodium lauryl suifate (NaLS) solubilized pyrene as a fluorescent probe and methylene iodide or nitromethane as quenchers. The constants of the distribution equilibrium of these quenchers between NaLS micelles and water were determined as K(CH/sub 3/NO/sub 2/) = 1.64x 10/sup 2/ M/sup -1/ and K(CH/sub 2/I/sub 2/) = 2.5 x 10/sup 3/ M/sup -1/ u sing the (296 deg K) using the pulse radiolysis method. From the kinetic evaluation we obtain for the specific rates of association and dissociation of methylene iodide and NaLS micelles n = 2.5 x 10/sup 10/ M/sup -1/ sec/sup -1/ and K' = 9.5 x 10/sup 6/ sec/sup -1/ (296 deg K) Triplet lifetime measuremente with solutions containing micellized cetyltrimethylammoninm bromide (CTAB), for the exit of anthracene from the CTAB micelle into the aqueous phase is as low as 2 x 10/sup 2/ sec/sup -1/ (296 deg K). (auth)

• Research Organization: Univ. of Notre Dame, IN
• NSA Number: NSA-29-015377
• OSTI ID: 4344368
• Journal Information: J. Phys. Chem., v. 78, no. 2, pp. 190-195, Journal Name: J. Phys. Chem., v. 78, no. 2, pp. 190-195; ISSN JPCHA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

*RADIATION CHEMISTRY-- LUMINESCENCE
AQUEOUS SOLUTIONS
AROMATICS
CONDENSED AROMATICS
KINETICS
MOLECULES
N40300* --Chemistry--Radiation Chemistry
PULSED IRRADIATION
RADIOLYSIS