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@ARTICLE{Valero:889024,
author = {Valero, Margarita and Levin, Peter P. and Sultimova,
Natalya B. and Houston, Judith},
title = {{P}hotochemistry of nabumetone in aqueous solution of
sodium dodecyl sulfate ({SDS}) micelles},
journal = {Journal of molecular liquids},
volume = {319},
issn = {0167-7322},
address = {New York, NY [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2020-05397},
pages = {114093 -},
year = {2020},
abstract = {The photochemistry, solubility and distribution between two
phases of nabumetone (NB) in aqueous solution of sodium
dodecyl sulfate (SDS) micelles were studied. The solubility
(SNB) of NB was monitored using steady-state UV–Vis
absorption spectroscopy. The linear relationship of SNB to
SDS concentration ([SDS]) gave the large value of partition
coefficient, P (logP = 3.5), for NB distribution between the
aggregate and the water phase showing the localization of NB
in the micellar phase. NB fluorescence (FL) quantum yield
increases with [SDS] from 0.03 in water to 0.056 at 0.2 M
[SDS]. The dependence of FL intensity at 355 nm (F335) on
[SDS] is bell-shaped. The plot of initial F335 increase with
[SDS] in the range 0–0.05 M gave the expected value of the
critical micelle concentration (cmc = 7.9 mM). Further
increase of [SDS] resulted in $10\%$ decrease of F335
demonstrating the variation of the micellar structure.
Small-Angle Neutron Scattering (SANS) and refractometry
confirmed this variation. The NB in SDS was protected
against photodegradation. High Performance Liquid
Chromatography/Mass Spectrometry (HPLC/MS) detected
2-(but-2-en-1-yl)-6-methoxynaphthalene as NB final
photoproducts in SDS solution which was not found in
homogeneous media. The hydrated electron localized in water
phase, NB radical cation and NB triplet excited state both
localized in the micellar phase were observed by laser flash
photolysis of NB in micellar solution. The decay kinetics of
these intermediates was different with respect to that in
the homogeneous media. The reactivity of NB in SDS micellar
environment compared to the homogeneous media is under the
discussion.},
cin = {JCNS-FRM-II / JCNS-1 / MLZ},
ddc = {540},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106 / I:(DE-588b)4597118-3},
pnm = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
/ 6G15 - FRM II / MLZ (POF3-6G15)},
pid = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15},
experiment = {EXP:(DE-MLZ)KWS2-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000583948500080},
doi = {10.1016/j.molliq.2020.114093},
url = {https://juser.fz-juelich.de/record/889024},
}