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

Styrene polymerization with organoeuropium compounds containing pyrazinamide

“…Thus, organolanthanides containing pyrazinamide (PzA) ligand may be suitable precursor compounds while their synthesis is rather simple [5][6][7][8] and also because Pza stabilize better the organolanthanide compound since it coordinates lanthanide ions by oxygen and/or nitrogen atoms. In search for improving organolanthanide catalysts performance, MAO can be used as co-catalyst since it is one of the most important industrial co-catalysts nowadays used [5][6][7][8].…”

“…So, monocyclopentadienyl pyrazinamide derivatives as LnCpA 2 (PzA) 2 , Ln: Nd, Sm, Eu, Tb and A: methanesulfonate ðMS ¼ CH 3 SO À 3 Þ [5] or chloride [6], and LnBr 2 CpPzA (Ln: Nd, Sm) [7] have been studied in ethylene polymerization and when activated with MAO, these compounds presented catalytic activities of 4-6 kg(PE) mol(Ln) À1 bar À1 h À1 at 70°C, with Al/Ln ratios of ca. 2000, independently of the lanthanide metal.…”

“…Organoeuropium compounds EuCp(MS) 2 (PzA) 2 and EuCl 2 Cp(PzA) 2 used here as catalysts are described in the literature [5,6]. All manipulations were performed under pre-purified argon atmosphere using pre-treated reagents [9].…”