Organolanthanide Compounds Containing The Pirazinamide Ligand: Synthesis, Characterization And Catalytic Activity In Ethylene Polymerization [compostos Organolantanídeos Contendo O Ligante Pirazinamida: Síntese, Caracterização E Atividade Catalítica Na Polimerização Do Etileno]

In this work we report the synthesis of some organolanthanide compounds which were identified as LnCl 2Cp(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%).255762765Ziegler, K., Holzkamp, E., Martin, H., Breil, H., (1955) Angew. Chem., 67, p. 541Sinn, H., Kaminsky, W., (1980) Adv. Organomet. Chem., 18, p. 99Britovsek, G.J.P., Gibson, V.C., Wass, D.F., (1999) Angew. Chem., Int. Ed., 38, p. 428Gatti, P.M., Oliveira, W., (1998) J. Alloys Compd., 275-277, p. 894Vogel, A.I., Furniss, B.S., (1989) Vogel's Textbook of Practical Organic Chemistry, 5 th Ed., , Longman: London, New YorkLyle, S.J., Rahman, Md.M., (1963) Talanta, p. 257Gray, A.P., (1970) Thermochim. Acta, 1, p. 563Miotti, R.D., Lavini, V., Oliveira, W., (1999) Resumos da 22 a. Reunião Anual da Sociedade Brasileira de Química, , Poços de Caldas, BrasilMiotti, R.D., (2000) Tese de Doutorado, , Universidade de São Paulo, BrasilDuval, C., (1963) Inorganic Thermogravimetric Analysis2 a Ed., , Elsevier Publishing Company: Amsterdam, New YorkSingh, P.P., Seth, J.N., (1975) J. Inorg. Nucl. Chem., 37, p. 593De Sá, G., De Almeida, M.A.V., (1980) J. Coord. Chem., 10, p. 35Allan, J.R., Paton, A.D., Turvey, K., Bowley, H.J., Gerrard, D.L., (1988) J. Coord. Chem., 17, p. 255Fritz, H.P., (1964) Adv. Organomet. Chem., 1, p. 239Lavini, V., Maia, A.S., Paulino, I.S., Schuchardt, U., Oliveira, W., (2001) Inorg. Chem. Comm., 4, p. 582Ballard, D.G.H., Courtis, A., Holton, J., McMeeking, J., Pierce, R., (1978) J. Chem. Soc. Chem. Comm., p. 994Jeske, G., Lauke, H., Mauermann, H., Swepston, P.N., Schumann, H., Marks, T.J., (1985) J. Am. Chem. Soc., 107, p. 8091Timonen, S., Pakkanen, T.T., (1996) J. Mol. Catal. A: Chem., 111, p. 267Aggarwal, S.L., Sweeting, O.J., (1957) Chem. Rev., 57, p. 66