A monometallic (Ni 2+ , 1) and a bimetallic (Ni 2+ -Sm 3+ , 2) complexes based on the Salen-type Schiff-base ligand H 2 L (H 2 L ¼ N,N 0 -bis(3-methoxysalicylidene)ethylene-1,2-diamine) were synthesized and characterized by FT-IR, ESI-MS and X-ray crystallography. The catalysis results showed that the two complexes with different active species, could efficiently catalyze the bulk solvent-free melt ringopening polymerization (ROP) of L-lactide with moderate molecular weights and narrow molecular weight distributions. Especially, for the bimetallic complex 2, the involvement of rare ions effectively passivated the catalytic behavior on the ROP of L-lactide, while was in favor of the increase of polymeric molecular weights (M n ) and the polymerization controllability.
A monometallic (Cu 2+ , 1) and a bimetallic (Cu 2+ -Nd 3+ , 2) Salen-type Schiff-base complexes with different reactive species, could efficiently catalyze the bulk solvent-free melt ring-opening polymerization (ROP) of L-lactide. Especially for the bimetallic complex 2, the involvement of rare earth ion was important and influential to the catalytic behaviors.
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