The ability of density functional models in dealing with polymerization mechanisms has been investigated by comparison with high level post-Hartree-Fock methods. Ethylene insertion and chain transfer reactions have been compared for a model of the active species suggested for the Jordan aluminum catalyst [{R'C(NR")(2))}AIR](+). Conventional density functional approaches (BP86) show a strong bias in favor of chain transfer reactions via hydrogen transfer. The B1LYP model provides improved energy barriers. The aluminum model used strongly favors chain transfer over insertion, this preference being further enhanced by lengthening the growing polymer chain. These findings cast some doubts about currently accepted models of the active species in the Jordan catalyst

A theoretical study of the competition between ethylene insertion and chain transfer in cationic aluminum systems / Talarico, Giovanni; Budzelaar, Petrus Henricus Maria; Barone, V; Adamo, C.. - In: CHEMICAL PHYSICS LETTERS. - ISSN 0009-2614. - STAMPA. - 329:(2000), pp. 99-105. [10.1016/S0009-2614(00)00981-7]

A theoretical study of the competition between ethylene insertion and chain transfer in cationic aluminum systems

TALARICO, GIOVANNI;BUDZELAAR, Petrus Henricus Maria;
2000

Abstract

The ability of density functional models in dealing with polymerization mechanisms has been investigated by comparison with high level post-Hartree-Fock methods. Ethylene insertion and chain transfer reactions have been compared for a model of the active species suggested for the Jordan aluminum catalyst [{R'C(NR")(2))}AIR](+). Conventional density functional approaches (BP86) show a strong bias in favor of chain transfer reactions via hydrogen transfer. The B1LYP model provides improved energy barriers. The aluminum model used strongly favors chain transfer over insertion, this preference being further enhanced by lengthening the growing polymer chain. These findings cast some doubts about currently accepted models of the active species in the Jordan catalyst
2000
A theoretical study of the competition between ethylene insertion and chain transfer in cationic aluminum systems / Talarico, Giovanni; Budzelaar, Petrus Henricus Maria; Barone, V; Adamo, C.. - In: CHEMICAL PHYSICS LETTERS. - ISSN 0009-2614. - STAMPA. - 329:(2000), pp. 99-105. [10.1016/S0009-2614(00)00981-7]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/166555
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