Catalytic Effect of Cobalt and Iron Complexes Incorporating Bis(2-aldiminoethyl)amine Ligands on Eth

Complexes [MCl2{CH3N(CH2CH2NCR1R2)2}](3, M=Co, R1=H, R2=Ph; 4, M=Fe, R1=H, R2=Ph; 5, M=Co, R1=R2=Ph) were prepared and characterized by IR spectra and elemental analysis. The combination of each of complexes 3-5 with ethylaluminoxane(EAO), respectively, was found to be moderately active for ethylene oligomerization to low carbon olefins. The activity of 113 kg oligomers*mol-1 Co*h-1 for complex 3(100 mol of EAO, 180 ℃ and 1.8 MPa ethylene) was observed with a selectivity of 93% to C4-10 olefins, of which 96% were linear C4-10 olefins. The catalytic properties of complexes 3-5 were compared with those of analogous P,P-coordinated complexes [MCl2{CH3N(CH2CH2PPh2)2}](1, M=Co; 2, M=Fe).