本研究中成功的合成出一系列具六配位之氨基苯酚配位基以及它們的鈦、鋯金屬錯合物。探討利用具六配位氨基苯酚之鈦、鋯金屬錯合物,對單體為ε-環己內酯 (ε-Caprolactone, ε-CL) 與L-聚乳酸交酯 (L -Lactide, L-LA) 之開環聚合催化反應。結果顯示出配位基的螯合效應,影響ε-環己內酯與L-聚乳酸交酯之開環聚合反應活性。在鈦金屬錯合物系列中,當鈦金屬搭配2 - 氟芐基配位基時,不論單體為ε-環己內酯或是L-聚乳酸交酯,都擁有最快的催化轉化效率。在鋯金屬錯合物系列中,單體為ε-環己內酯條件下,配位基為2 -(二甲氨基)芐基 (2-(dimethylamino)benzyl group) 擁有最佳的催化轉化效率;而單體為L-聚乳酸交酯條件下,配位基為2 - 甲氧基芐基 (2-methoxybenzyl group) 擁有最佳的催化轉化效率。因此,在ε-環己內酯與L-聚乳酸交酯之開環聚合作用中,配位基上不同種類的配位原子,對於催化中心金屬之活性的改變具有一定的影響力。
A series of hexa-dentate aminopheol ligands and their titanium and zirconium complexes were synthesized and Ring-opening Polymerization (ROP) of ε-caprolactone (ε-CL) and L-lactide (L-LA) by these metal complexes has been successfully studied. According to the experiment result, the chelate effect of ligands influenced the polymerization activity of the catalysts for ROP of ε-CL and L-LA. For Ti complexes, the complex with two 2-fluorobenzyl groups owns the greatest catalytic activity for CL and LA polymerization. For Zr complexes, 2-(dimethylamino)benzyl group is the most effective for CL polymerization and 2-methoxybenzyl group is the most efficient for LA polymerization. Polymerization studies indicate that the chelate effect by pendent atoms dramatically affects the catalytic activity of metal center.