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000189819 245__ $$aUsing Inclusion Complexes with Cyclodextrins To Explore the Aggregation Behavior of a Ruthenium Metallosurfactant
000189819 260__ $$aWashington, DC$$bACS Publ.$$c2015
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000189819 520__ $$aThe aggregation behavior of a chiral metallosurfactant, bis(2,2′-bipyridine)(4,4′-ditridecyl-2,2′-bipyridine)ruthenium(II) dichloride (Ru24C13), synthesized as a racemic mixture was characterized by small-angle neutron scattering, light scattering, NMR, and electronic spectroscopies. The analysis of the SANS data indicates that micelles are prolate ellipsoids over the range of concentrations studied, with a relatively low aggregation number, and the micellization takes place gradually with increasing concentration. The presence of cyclodextrins (β-CD and γ-CD) induces the breakup of the micelles and helps to establish that micellization occurs at a very slow exchange rate compared to the NMR time scale. The open structure of this metallosurfactant enables the formation of very stable complexes of 3:1 stoichiometry, in which one CD threads one of the hydrocarbon tails and two CDs the other, in close contact with the polar head. The complex formed with β-CD, more stable than the one formed with the wider γ-CD, is capable of resolving the Δ and Λ enantiomers at high CD/surfactant molar ratios. The chiral recognition is possible due to the very specific interactions taking place when the β-CD covers—via its secondary rim—part of the diimine moiety connected to the hydrophobic tails. A SANS model comprising a binary mixture of hard spheres (complex + micelles) was successfully used to study quantitatively the effect of the CDs on the aggregation of the surfactant.
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000189819 65017 $$0V:(DE-MLZ)GC-1602-2016$$2V:(DE-HGF)$$aPolymers, Soft Nano Particles and  Proteins$$x2
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000189819 65017 $$0V:(DE-MLZ)GC-140$$2V:(DE-HGF)$$aSoft Matter, Macromolecules, Complex fluids, Biophysics $$x0
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000189819 7001_ $$0P:(DE-HGF)0$$aGuerrero-Martínez, Andrés$$b1
000189819 7001_ $$0P:(DE-HGF)0$$aTardajos, Gloria$$b2
000189819 7001_ $$0P:(DE-HGF)0$$aOrtiz, María José$$b3
000189819 7001_ $$0P:(DE-HGF)0$$aPalao, Eduardo$$b4
000189819 7001_ $$0P:(DE-HGF)0$$aMontoro, Teresa$$b5
000189819 7001_ $$0P:(DE-Juel1)130905$$aRadulescu, Aurel$$b6$$ufzj
000189819 7001_ $$0P:(DE-HGF)0$$aDreiss, Cécile A.$$b7
000189819 7001_ $$0P:(DE-HGF)0$$aGonzález-Gaitano, Gustavo$$b8$$eCorresponding Author
000189819 773__ $$0PERI:(DE-600)2005937-1$$a10.1021/la504929x$$gVol. 31, no. 9, p. 2677 - 2688$$n9$$p2677 - 2688$$tLangmuir$$v31$$x1520-5827$$y2015
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