Aggregation and counter ion binding ability of sulfonatomethylcalix[4]resorcinarenes in aqueous solutions

1 H NMR spectroscopy, 1 H NMR spin-lattice relaxation, conductivity and pH-metric titration data have been used to study the aggregation and counter-ion binding of tetrasulfonatomethylcalix[4]resorcinarenes with methyl (H 8XNa 4) and amyl (H 8YNa 4) substituents. The data obtained reveal the self-ag...

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Bibliographic Details
Published in:	Colloids and surfaces. A, Physicochemical and engineering aspects Vol. 240; no. 1; pp. 35 - 43
Main Authors:	Amirov, R.R, Nugaeva, Z.T, Mustafina, A.R, Fedorenko, S.V, Morozov, V.I, Kazakova, E.Kh, Habicher, W.D, Konovalov, A.I
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 15-06-2004
Subjects:	Inclusion Lanthanide ion Self-assembly Water-soluble calixresorcinarene Self-assembly Lanthanide ion Inclusion Water-soluble calixresorcinarene
Online Access:	Get full text
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Summary:	1 H NMR spectroscopy, 1 H NMR spin-lattice relaxation, conductivity and pH-metric titration data have been used to study the aggregation and counter-ion binding of tetrasulfonatomethylcalix[4]resorcinarenes with methyl (H 8XNa 4) and amyl (H 8YNa 4) substituents. The data obtained reveal the self-aggregation of H 8YNa 4 driven by hydrophobic interactions. The NMR relaxation data indicate that Gd 3+ is bound by both H 8XNa 4 and H 8YNa 4. The Gd 3+ ions were found to induce the aggregation of H 8YNa 4 with critical association concentration (CAC) value less than in case of its self-aggregation. Using Gd 3+ as a probe of counter-ion binding with the aggregate interface it was found out that binding of quaternary ammonium cations (QUATSs) with H 8YNa 4 aggregates and SDS aggregates is quite different, while binding of inorganic ions by both types of aggregates is similar. The most outstanding peculiarity of QUATSs binding with H 8YNa 4 aggregates is selective recognition of QUATSs, possessing trimethylammonium group, detected by NMR relaxation method.
ISSN:	0927-7757 1873-4359
DOI:	10.1016/j.colsurfa.2004.03.013