Chromium (III) complex bearing N,N'- di-t-Bu-2, 11-diaza[3.3] (2,6)-pyridinophane ligand (t-Bu-N4CrCl2+ Cl) was synthesized and characterized. This complex was tested in ethylene and propylene polymerisation, under several reaction conditions, in the presence of MAO (metilaluminoxane) or Et3Al2Cl3 (ethyl aluminium sesquichloride), as cocatalysts. The use of the catalytic system t-Bu-N4CrCl2+ Cl -/Et3Al2Cl3 led to ethylene-propylene copolymers and polyethylene, with good yields. The polymers thus produced display high molar masses and narrow polydispersities.
Catalysis; polyolefins; chromium (III); macrocyclic ligand; pyridinophane
