Four bimetallic Al or Zn complexes supported by anilido-aldimine ligands (o-C6H4(NHAr)–CH
N)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 1–4 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.
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