| 초록 |
Herein, we report the construction of bimetallic titanium complexes based on the o-phenylene-bridged Cp/amide ligand system and their advantageous polymerization reactivity. Bimetallic dichlorotitanium complexes, {2,6-[η5-2,5-Me2C5H2]2-4-R-C6H2N-µN}{Ti(IV)Cl2}2 (R = Me; R = F) and 4,4_-A[{2-(η5-2,3,5-Me3C5H)C6H3NC6H11-κN}Ti(IV)Cl2]2 (1, A = CH2; 2, A = O; 3, A = ortho-C6H4) are prepared via a key step of the Suzuki-coupling reaction of 2-dihydroxyboryl- 3-methyl-2-cyclopenten-1-one with dibromo-compounds. The solid state structure of 7 was determined by X-ray crystallography. The complexes 1-3 are highly active and their activities are higher than that of the mononuclear analogue, {2-(η5-2,3,5-Me3C5H)C6H3NC6H11-κN}Ti(IV)Cl2 (5). The molecular weights of the polymers obtained with the bimetallic complexes 1-3 are higher than that of the polymer obtained using 5. Slightly higher contents of long-chain-branching are observed for the copolymers obtained using the bimetallic system. |
