Aggregate Structures of Asymmetric Di-Alkyl Phosphate Anions and the Role of Conformations about the Polar Region: SANS, Cryo-TEM, Raman Scattering, 13C NMR, and Selective NOE Studies
| Autor: | Charmian J. O'Connor, Hirofumi Okabayashi, Sonoko Sasuga, Daphne Weihs, Yeshayahu Talmon |
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| Rok vydání: | 2012 |
| Předmět: |
Anions
inorganic chemicals Magnetic Resonance Spectroscopy Molecular Conformation Spectrum Analysis Raman Micelle Molecular conformation Phosphates symbols.namesake chemistry.chemical_compound Organophosphorus Compounds Cryo tem Scattering Small Angle Materials Chemistry Physical and Theoretical Chemistry Micelles chemistry.chemical_classification Carbon Isotopes Chemistry Cryoelectron Microscopy Alkyl phosphate Water Carbon-13 NMR Surfaces Coatings and Films Neutron Diffraction Crystallography Hydrocarbon symbols Thermodynamics Polar Raman scattering |
| Zdroj: | The Journal of Physical Chemistry B. 116:3538-3550 |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/jp300019n |
| Popis: | The aggregate structures of two di-n-alkyl-phosphate anions (di-n-alkyl: n-butyl(n-dodecyl)(BDoP) and n-hexyl(n-dodecyl)(HDoP)) in water were studied by the use of SANS, cryo-TEM, Raman scattering, (13)C NMR, and selective NOE ((1)H{(1)H}) techniques. The results of SANS indicated that the different -CH(2)- lengths of the short chain led to a marked difference in the aggregational behavior of BDoP and HDoP. Cryo-TEM added direct images to support the average aggregation size and shape predicted by the SANS analyses. Raman scattering, (13)C NMR, and selective NOE results provided further evidence that variation of molecular conformations strongly contributed to variation in the shape of the aggregates. In particular, selective NOE was a powerful technique for investigating the dynamic structures of the hydrocarbon chains during growth of the micelles. |
| Databáze: | OpenAIRE |
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