conformational investigation of zwitterionic surfactants in the micelle via ¹³C chemical shift measurements and 2D NOESY spectroscopy

The conformation and orientation of a series of zwitterionic surfactants (the alkyl-N,N-dimethylammoniopropanesulfonates, or Zwittergent® Detergents) has been studied via ¹³C chemical shift measurements and 2D NOESY spectroscopy. Chemical shift changes (Δδ values) support the tendency for the interc...

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Bibliographic Details
Published in:Colloid and polymer science 2010-04, Vol.288 (6), p.653-663
Main Authors: McLachlan, Aleisha A, Singh, Kulbir, Marangoni, D. Gerrard
Format: Article
Language:English
Subjects:
Carbon
Cationic
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Colloidal state and disperse state
Complex Fluids and Microfluidics
Exact sciences and technology
Food Science
General and physical chemistry
Micelles
Micelles. Thin films
Monomers
Nanotechnology and Microengineering
Orientation
Original Contribution
Physical Chemistry
Polymer Sciences
Soft and Granular Matter
Spectroscopy
Surfactants
Two dimensional
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Summary:The conformation and orientation of a series of zwitterionic surfactants (the alkyl-N,N-dimethylammoniopropanesulfonates, or Zwittergent® Detergents) has been studied via ¹³C chemical shift measurements and 2D NOESY spectroscopy. Chemical shift changes (Δδ values) support the tendency for the intercharge arm to adopt a ring-like orientation as the alkyl chain length increases. Protons of the headgroup regions for both the 8 carbon and the 10 carbon Zwittergent® appear to form a greater number of intermolecular interactions with headgroups of neighboring monomers in the micelle. Interactions between the end of the alkyl chain and the headgroup region of the 12 carbon Zwittergent® are also apparent from examination of the NOESY spectrum indicating that the tail folds back towards the surface of the micelle. These results indicate that a combination of the ring-like conformation of the intercharge arm along with crowding in the vicinity of the sulfonate group could explain why ZW3-12 appears to behave more as a cationic surfactant in previously studied mixed micellar systems.
ISSN:0303-402X
1435-1536
DOI:10.1007/s00396-009-2182-1