Four bimetallic Al or Zn complexes supported by anilido-aldimine ligands (o-C6H4(NHAr)âCHN)2CH2CH2 (Ar = 2,6-Me2C6H3, L11H2; Ar = 2,6-iPr2C6H3, L22H2) have been synthesized and characterized. Treatment of L11H2 or L22H2 with two equiv. of AlMe3 gives bimetallic complex L11(AlMe2)21 or L22(AlMe2)22, respectively. Reaction of L11H2 or L22H2 with two equiv. of ZnEt2 leads to bimetallic complex L11(ZnEt)23 or L22(ZnEt)24, respectively. All of the complexes 1â4 are efficient catalysts for ring-opening polymerization of ε-caprolactone (CL) in the presence of benzyl alcohol and catalyze the polymerization of CL in living fashion yielding polymers with a narrow polydispersity index. The activity of bimetallic Zn complexes 3 and 4 is higher than bimetallic Al complexes 1 and 2.
合成了四种由
苯胺基醛
亚胺配体 (o-
C6H4(NHAr)→CHN)2CH2CH2 (Ar = 2,6-Me2C6H3, L11H2; Ar = 2,6-iPr2C6H3,
L22H2) 支持的双
金属 Al 或 Zn 配合物特点。用两当量治疗 L11H2 或
L22H2。 AlMe3 分别得到双
金属络合物 L11(AlMe2)21 或
L22(AlMe2)22。 L11H2 或
L22H2 与两个当量的反应。 ZnEt2 分别形成双
金属络合物 L11(ZnEt)23 或
L22(ZnEt)24。所有配合物 1–4 都是在
苯甲醇存在下进行
ε-己内酯 (CL) 开环聚合的有效催化剂,并以活泼的方式催化 CL 的聚合,产生具有窄多分散指数的聚合物。双
金属Zn配合物3和4的活性高于双
金属Al配合物1和2。