Crown‐like macrocycle zinc complex derived from β‐diketone ligand for the polymerization of rac‐lactide |
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| Authors: | Xuan Pang Xuesi Chen Xiuli Zhuang Xiabin Jing |
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| Affiliation: | 1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China;2. Graduate School of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100039, People's Republic of China |
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| Abstract: | Enolic Schiff base zinc (II) complex 1 was synthesized. XRD revealed 1 was a novel crown‐like macrocycle structure consisted of hexanuclear units of (LZnEt)6 via the coordination chelation between the Zn atom and adjacent amine nitrogen atom. Further reaction of 1 with one equivalent 2‐propanol at RT produced Zn‐alkoxide 2 by in situ alcoholysis. Complex 2 was used as an initiator to polymerize rac‐lactide in a controlled manner to give heterotactic enriched polylactide. Factors that influenced the polymerization such as the polymerization time and the temperature as well as the monomer concentration were discussed in detail in this paper. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 643–649, 2008 |
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| Keywords: | biodegradable crystal structure enolic ring‐opening polymerization stereoselective |
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