936643-67-3Relevant academic research and scientific papers
Substituent effects in (κ2-N,O)-salicylaldiminato nickel(II)-methyl pyridine polymerization catalysts: Terphenyls controlling polyethylene microstructures
Goettker-Schnetmann, Inigo,Wehrmann, Peter,Roehr, Caroline,Mecking, Stefan
, p. 2348 - 2362 (2007)
A series of (κ2-N,O)-salicylaldiminato Ni(II)-methyl pyridine complexes 7-pyr and 8-pyr derived from 3,5-diiodosalicyaldehyde (3a) and 3-(9-anthryl)salicylaldehyde (3b), and terphenylamines 2,6-(3,5-R-4- R′-C6H2)2C6H 3-NH2 (4a, R = CF3, R′ = H; 4b, R = tBu, R′ = H; 4c, R = tBu, R′ = OH; 4d, R = Me, R′ = H; 4e, R = Me, R′ = MeO; 4f, R = MeO, R′ = H; 4g, R = MeO, R′ = MeO), was prepared by reaction of the respective salicylaldimine (5a-f, 6a-g) with [(tmeda)Ni(CH3)2] (tmeda = N,N,N′ N′-tetramethylethylenediamine) or [(pyridine)2Ni(CH 3)2]. Complexes 7-pyr and 8-pyr are highly active single component catalysts for the polymerization of ethylene, producing a wide range of different polyethylene microstructures. While comparable complexes derived from 3a, 3b, 5-nitrosalicylaldehyde, 3-tertbutylsalicylaldehyde, 3,5-[3,5-(CF3)2C6H3] 2-salicylaldehyde, and 2,6-[3,5-(CF3)2C 6H3]2C6H3-NH2 afford polyethylenes with similar degrees of branching, variation of the terphenyl moieties in complexes 7-pyr and 8-pyr allows access to a wide range of polyethylene microstructures under identical reaction conditions. The X-ray diffraction analyses of complexes 7b-pyr and 8f-pyr are reported.
