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@ARTICLE{Iza:189819,
author = {Iza, Nerea and Guerrero-Martínez, Andrés and Tardajos,
Gloria and Ortiz, María José and Palao, Eduardo and
Montoro, Teresa and Radulescu, Aurel and Dreiss, Cécile A.
and González-Gaitano, Gustavo},
title = {{U}sing {I}nclusion {C}omplexes with {C}yclodextrins {T}o
{E}xplore the {A}ggregation {B}ehavior of a {R}uthenium
{M}etallosurfactant},
journal = {Langmuir},
volume = {31},
number = {9},
issn = {1520-5827},
address = {Washington, DC},
publisher = {ACS Publ.},
reportid = {FZJ-2015-02837},
pages = {2677 - 2688},
year = {2015},
abstract = {The aggregation behavior of a chiral metallosurfactant,
bis(2,2′-bipyridine)(4,4′-ditridecyl-2,2′-bipyridine)ruthenium(II)
dichloride (Ru24C13), synthesized as a racemic mixture was
characterized by small-angle neutron scattering, light
scattering, NMR, and electronic spectroscopies. The analysis
of the SANS data indicates that micelles are prolate
ellipsoids over the range of concentrations studied, with a
relatively low aggregation number, and the micellization
takes place gradually with increasing concentration. The
presence of cyclodextrins (β-CD and γ-CD) induces the
breakup of the micelles and helps to establish that
micellization occurs at a very slow exchange rate compared
to the NMR time scale. The open structure of this
metallosurfactant enables the formation of very stable
complexes of 3:1 stoichiometry, in which one CD threads one
of the hydrocarbon tails and two CDs the other, in close
contact with the polar head. The complex formed with β-CD,
more stable than the one formed with the wider γ-CD, is
capable of resolving the Δ and Λ enantiomers at high
CD/surfactant molar ratios. The chiral recognition is
possible due to the very specific interactions taking place
when the β-CD covers—via its secondary rim—part of the
diimine moiety connected to the hydrophobic tails. A SANS
model comprising a binary mixture of hard spheres (complex +
micelles) was successfully used to study quantitatively the
effect of the CDs on the aggregation of the surfactant.},
cin = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
(München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
ddc = {670},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106},
pnm = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
Neutron Research (JCNS) (POF3-623)},
pid = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
experiment = {EXP:(DE-MLZ)KWS2-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000350918500009},
doi = {10.1021/la504929x},
url = {https://juser.fz-juelich.de/record/189819},
}