Self-Organization and Catalytic Activity of the Poly(ethylene glycol)(10) Monododecyl Ether/Poly(ethyleneimine)/Lanthanum Nitrate System

• Published in: Journal of physical chemistry. C 2007-09, Vol.111 (37), p.13839-13845
• Main Authors: Zakharova, Lucia Ya, Ibragimova, Alsu R., Valeeva, Farida G., Kudryavtseva, Lyudmila A., Konovalov, Alexander I., Zakharov, Andrey V., Selivanova, Nataliya M., Osipova, Valentina V., Strelkov, Mikhail V., Galyametdinov, Yuri G.
• Format: Article
• Language: English
• ISSN: 1932-7447; 1932-7455
• DOI: 10.1021/jp0716536

The self-organization of the poly(ethylene glycol)(10)monododecyl ether (C12EO10)/poly(ethyleneimine) (PEI)/La(III)/water multicomponent system has been examined in the micellar and liquid-crystalline ranges. A step-by-step investigation of the catalytic effect toward the cleavage of phosphorus acid esters was performed for the following series:  single C12EO10 micelles → ternary C12EO10/PEI/water micellar system → quaternary C12EO10/PEI/La(III)/water micellar system → liquid-crystalline mesophase. The quaternary system was found to be an effective nanosized catalyst, demonstrating the complex mechanism of the catalytic action under mild conditions (25 °C, pH ≈ 8.0) and the substrate specificity toward the more hydrophobic phosphonate. A marked (ca. 1000-fold) acceleration of the reaction studied as compared to the basic hydrolysis of the substrates was achieved.