Rare-Earth Metal Bis(alkyl)s Supported by a Quinolinyl Anilido-Imine Ligand: Synthesis and Catalysis on Living Polymerization of ε-Caprolactone

The tridentate ligand N -(2-((2,6-diisopropylphenylimino)methyl)phenyl)quinolin-8-amine ( HL ) was prepared. Treatment of HL with 1 equiv of Ln(CH 2 SiMe 3 ) 3 (THF) 2 afforded the corresponding rare-earth metal bis(alkyl) complexes L Ln(CH 2 SiMe 3 ) 2 (THF) n (Ln = Sc, n = 0 ( 1 ); Y, n = 1 ( 2 ); Lu, n = 0 ( 3 )) in high yields. Variable-temperature 1 H NMR spectral analysis showed that these complexes were fluxional at room temperature. Complexes 1 and 3 were THF-free, where the metal center adopted a square-pyramidal geometry, while in 2 the metal center generated a distorted octahedral geometry owing to the coordination of a THF molecule. All these complexes catalyzed the ring-opening polymerization of ε-caprolactone with high activities in living fashion, among which the Lu complex was proved to be more active than its Sc and Y analogues.