Add time:07/14/2019         Source:sciencedirect.com

The reaction between [CuCl2·2H2O] and N,N′-bidentate N-(pyridin-2-ylmethyl)amines (Ln = LA–LE) in methanol yielded new Cu(II) complexes; namely mononuclear [LACuCl2] and dinuclear [LnCu(μ-Cl)Cl]2 (Ln = LB–LE) complexes, respectively. Monomeric [LACuCl2] showed a distorted square planar geometry around copper metal based on X-ray crystallography. The dimeric [LnCu(μ-Cl)Cl]2 (Ln = LB–LE) had a chloro-bridged 5-coordinated and a distorted square pyramidal geometry around the Cu(II) center. The range of Cu⋯Cu′ distance was 3.3238(6)–3.593(2) Å in [LnCu(μ-Cl)Cl]2 (Ln = LB–LE). The Cu(II)-alkoxy derivatives, generated in situ, of these synthesized Cu(II) complexes have shown moderate activity towards the polymerization of rac-lactide (rac-LA) and yielded hetero-enriched PLA. The steric hindrance and electronic effects has a great influence on the catalytic activity and stereoselectivity of initiators.

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