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中文摘要：
设计、合成了一系列不对称席夫碱配体，得到了相应的金属铝配合物．研究了配合物在外消旋丙交酯的开环聚合反应中的催化性能．结果表明，系列配合物对外消旋丙交酯（rae—LA）的聚合催化活性明显提高，并具有立体选择性．
英文摘要：
A series of asymmetric Schiff-base ligands and their aluminum Al （Ⅲ） complexes that contained different steric substituent were designed and synthesized. The structures of ligands and their complexes were characterized. One crystal of Schiff-base aluminum complex was obtained. X-Ray diffraction analyses showed that the central aluminum atoms of the complex adopt twisted four pyramid geometry. They were chiral but ra-cemic complexes with two enantiomers in solid state. Their catalytic properties in the solution polymerization of racemic lactides（ rac-LA） in the presence of 2-propanol were investigated in detail. All of the complexes had poor stereoselectivity for ring-opening polymerization（ROP） of rac-LA（Pm about 0.55）, the polymerization rate of asymmetric complex was much faster than symmetric complex in ROP of rac-LA. The results evaluate that the substituent of ligands has great influence on the catalytic properties of the complex.
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