| 摘要 |
A novel trivalent Group IVB metal complex for preparing syndiotactic vinyl aromatic polymers is disclosed which is coordinated by a bidentate ligand and is represented by the formula (I): (C5RnH5-n)M(BD)mYp(I) wherein C5RnH5-n is a substituted or unsubstituted cyclopentadienyl group, n is an integer between 0 and 5, and R is C1 to C12 alkyl, aryl, substituted alkyl, or substituted aryl; M is a trivalent Group IVB metal; (BID) is a bidentate ligand with -1 valence, having a coordinating group which is capable of forming a coordinating bond or a chelating bond with the metal M; Y is selected from the group consisting of alkyl, aryl, aralkyl, halogen and hydrogen; m is an integer of 1 or 2; and m+p=2.
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