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Compostos organolantanídeos contendo o ligante pirazinamida: síntese, caracterização e atividade catalítica na polimerização do etileno

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Author(s): Miotti Renata Diana | Maia Alessandra de Souza | Oliveira Wanda de | Paulino Ícaro Sampaio | Schuchardt Ulf

Journal: Química Nova
ISSN 0100-4042

Volume: 25;
Issue: 5;
Start page: 762;
Date: 2002;
Original page

Keywords: organolanthanides | cyclopentadienyl | ethylene

ABSTRACT
In this work we report the synthesis of some organolanthanide compounds which were identified as LnCl2Cp(PzA)2, Ln = Nd, Sm, Eu and Tb, Cp = cyclopentadienyl and PzA = pirazinamide, by elemental analyses, complexometric titration with EDTA, thermal analyses and IR spectra. Thermal analysis and infrared spectra indicated that the coordination of the pyrazinamide to the lanthanide ions was made by the O atom of the carbonyl group and by one or both N atoms of the pyrazinamide ring. This class of compound showed catalytic activity of ca. 4.0 to 6.4 kgPE molLn-1 h-1 bar-1, in ethylene polymerization, using methylaluminoxane as cocatalyst. The resulting polyethylene presented low crystallinity (20%).

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