Nanosized Reactors Based on Polyethyleneimines:  From Microheterogeneous Systems to Immobilized Catalysts

Effective nanoreactors based on polyethyleneimines (PEIs) for the hydrolytic cleavage of O-alkyl O-p-nitrophenyl chloromethylphosphonates (alkyl = ethyl, hexyl) and di(p-nitrophenyl)phosphate were developed in conformity with the idea of modeling the polyfunctional catalytic mechanism of enzymes. A...

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Veröffentlicht in:Langmuir 2007-03, Vol.23 (6), p.3214-3224
Hauptverfasser: Zakharova, Lucia Ya, Ibragimova, Alsu R, Valeeva, Farida G, Zakharov, Andrey V, Mustafina, Asiya R, Kudryavtseva, Lyudmila A, Harlampidi, Harlampy E, Konovalov, Alexander I
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Sprache:eng
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Zusammenfassung:Effective nanoreactors based on polyethyleneimines (PEIs) for the hydrolytic cleavage of O-alkyl O-p-nitrophenyl chloromethylphosphonates (alkyl = ethyl, hexyl) and di(p-nitrophenyl)phosphate were developed in conformity with the idea of modeling the polyfunctional catalytic mechanism of enzymes. A step-by-step modification of the single PEI solution by additives with their own catalytic activities (sodium dodecyl sulfate and lanthanum salt) gave rise to a marked improvement in the reaction efficiency. A 104−106-fold acceleration of the reaction compared to the aqueous basic hydrolysis of the substrates was achieved in the sodium dodecyl sulfate−polyethyleneimine−La(III) ternary system. This system can be considered to be metallomicelles immobilized on a hydrophilic polymer matrix. When the PEI immobilized on silica gel was used as a catalyst, the full completion of the reaction was achieved for 100 min under mild conditions, while the half-life of the reaction in a comparable homogeneous regime exceeds 100 h.
ISSN:0743-7463
1520-5827
DOI:10.1021/la0629633