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Nickel-diimine complexes DADNiX 2 (DAD= 2,6-iPr 2 -C 6 H 3 -N=C(Me)-C(Me)=N-2,6-iPr 2 -C 6 H 3 ) containing the non-chelating pseudohalide ligands isothyocyanate and isoseleniumcyanate (X= NCS 1 and NCSe 2) were synthesized and used in ethylene polymerization activated by methyaluminoxane (MAO) at temperatures from 0 to 50°C. Polymerizations with these complexes were compared with the analogous Ni-diimines halide (X= Br 3) as non-chelating ligand. All systems were very active in thisdoi:10.21577/0100-4042.20170237 fatcat:bkirekwtn5g4xhf6zqtp2s3elu