Abstract
A series of aluminum and indium complexes 2, 4, 5 supported by Salen-type ligands with sterically bulky cumyl groups have been synthesized and characterized. Experimental results show that the aluminum complex 2 efficiently catalyzes the polymerization of cyclic ester in a controlled fashion, yielding polymers with narrow polydispersity indexes. In addition, Complex 2 exhibits medium to high stereoselectivity with Pm = 0.94. Solid-state structural studies reveal that the complex 2 is mononuclear and the geometry around the aluminum center is penta-coordinated. The indium complexes 4 and 5 are also efficient initiators for the ring-opening polymerization of cyclic ester in the presence of benzyl alcohol both. Experimental results reveal that these complexes have living and immortal properties for the ring-opening polymerization.
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