Anionic Surfactants with Divalent Counterions of Separate Electric Charge. III. Proton NMR Study

Autor:	Tadashi Yonemitsu, Ryohei Matuura, Yoshikiyo Moroi
Rok vydání:	1991
Předmět:	inorganic chemicals chemistry.chemical_classification Aqueous solution Chemistry Chemical shift technology industry and agriculture Cationic polymerization Analytical chemistry General Chemistry Divalent chemistry.chemical_compound Polymer chemistry Pyridine Proton NMR Methylene Counterion
Zdroj:	Bulletin of the Chemical Society of Japan. 64:3094-3097
ISSN:	1348-0634 0009-2673
Popis:	The proton NMR spectra of 1-tetradecanesulfonates whose cationic counterion, the 1,1′-polymethylenedipyridinium ion (with even-numbered methylene groups up to 14), is divalent with separate electric charge, were measured. From the chemical shifts the pyridine rings were found to move about in quite hydrophilic environment of micellar surface region, leading to a downfield shift of methylene groups next to head group of surfactant ion. The chemical shifts of methylene groups of micellized counterions with more than eight methylene groups are different from those of corresponding counterions in aqueous environment and are similar to those of methylene group in hydrophobic micellar interior. These results strongly support the previous conclusion that the polymethylene group with more than eight methylene groups folds and penetrates micellar interior in their micellized state.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3bb20c9c3bf4b0619a36f54d41b3bdc6 https://doi.org/10.1246/bcsj.64.3094 Zobrazit plný text záznamu