Add time:09/09/2019         Source:sciencedirect.com

Novel [LnMCl2] complexes (Ln = LA, LB; M = Co, Cu, Zn) containing the N,N-chelating ligands N,N-bis((1H-pyrazol-1-yl)methyl)cyclopentanamine (LA) and N,N-bis((3,5-dimethyl-1H-pyrazol-1-yl)methyl)cyclopentanamine (LB) have been synthesized and characterized. The X-ray crystal structures of the Co(II) and Cu(II) complexes revealed that the ligands are coordinated in an N,N,N-tridentate manner, resulting in distorted trigonal bipyramidal geometries through the coordinative interaction of the nitrogen atom of the cyclopentylamine moiety and the metal centers. [LAZnCl2] showed a distorted tetrahedral geometry involving a non-coordinative interaction of the Namine atom and the Zn(II) center, resulting in the formation of an eight membered chelate ring. [LACoCl2] exhibited the highest catalytic activity (7.67 × 104 g PMMA/mol Co h) for the polymerization of MMA in the presence of MMAO at 60 °C and yielded PMMA with a high molecular weight (Mw) (11.2 × 105 g/mol) and narrower polydispersity index (PDI) 1.01 compared to its Cu(II) and Zn(II) analogs. Syndiotactic enriched PMMA was obtained with Tg in the range 120–132 °C. The introduction of bulky methyl substituents played an influential role on controlling the catalytic activities while the syndiotacticities remained unaffected.

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