A series of Al(III) chloride [LAl-Cl]; Al(III) alkoxide [LAl-OR] 2 ; and Zn(II) [LZn] 2 complexes with Schiff base ligands were obtained. 1 H NMR and X-ray diffraction studies indicate that [LAl-Cl] complexes have C s symmetry and the Al center is penta-coordinated. The Al(III) alkoxide complex [L 5 Al-O i Pr] 2 is a dimer bridged by O i Pr − with the Al center in a distorted octahedral environment. Zn complexes [LZn] 2 are double helix dimers with tetra-coordinated Zn centers. The catalytic activity for the ring-opening polymerization of rac-lactide was evaluated. The best activity in this series is shown by the aluminium chloride complex with a flexible three-carbon bridge; more flexible four-carbon bridges lower the activity.
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