An NMR Investigation of Fast Proton Transfer along the Surface of Cationic Micelles

An NMR Investigation of Fast Proton Transfer along the Surface of Cationic Micelles

CMCs and proton exchange rates of cationic micelles are shown to increase linearly with 1/[H+]. Enhanced proton transfers in micelles (see picture) are assigned to two major factors: a pH elevation of ca. 2 units around the micellar surface and a diffusion‐like proton switch from polar head to polar...

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Veröffentlicht in:Chemphyschem 2008-11, Vol.9 (16), p.2305-2308
Hauptverfasser: Dupont-Leclercq, Laurence, Delpuech, Jean-Jacques, Henry, Bernard
Format: Artikel
Sprache:eng
Schlagworte:
amphiphilic amines
Cations - chemistry
Chemistry
Colloidal state and disperse state
dynamic NMR spectroscopy
Exact sciences and technology
General and physical chemistry
hydrogen transfer
Hydrogen-Ion Concentration
Kinetics
Magnetic Resonance Spectroscopy
Micelles
Micelles. Thin films
Protons
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Zusammenfassung:CMCs and proton exchange rates of cationic micelles are shown to increase linearly with 1/[H+]. Enhanced proton transfers in micelles (see picture) are assigned to two major factors: a pH elevation of ca. 2 units around the micellar surface and a diffusion‐like proton switch from polar head to polar head. Rate enhancements are larger when the number of methylenic carbons in the surfactants used is increased from 8 to 10.
ISSN:1439-4235
1439-7641
DOI:10.1002/cphc.200800493