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Citation: LI Liang-Zhao, SHANG Xiao-Min, DU Hong-Zhi, CUI Dong-Mei, CHEN Xue-Si, JING Xia-Bin. Synthesis and Structure of Dimeric Schiff Base Aluminum Complex and Its Catalysis on Ring-opening Polymerization of ε-Caprolactone[J]. Chinese Journal of Applied Chemistry, ;2007, 24(8): 878-882. shu

Synthesis and Structure of Dimeric Schiff Base Aluminum Complex and Its Catalysis on Ring-opening Polymerization of ε-Caprolactone

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a State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022;
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b Graduate School, Chinese Academy of Sciences, Beijing;
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c Department of Polymer Materials, Changchun University of Technology, Changchun

Corresponding author: CUI Dong-Mei,
Received Date: 30 August 2006
Available Online: 12 December 2006
Fund Project: 国家自然科学面上基金资助项目(20571072) (20571072)吉林省科技厅应用基础资助项目(20050555) (20050555)

A Schiff-base ligated aluminum complex was synthesized by the treatment of aluminum tris (isopropoxide) swith a neutral Schiff-base compound.NMR and X-ray analyses reveal that the compound is a dimmer.Aluminum ion is coordinated with nitrogen and oxygen atoms from the ligand to form a unit.The two units are bridged by methoxy groups to generate a bimetallic structure.The aluminum ion and methoxy oxygen form a rhombus core that contains the symmetry center of the molecule.The complex shows efficient activity towards the ring-opening polymerization of ε-caprolactone to give a biodegradable polylactone.Dynamic analysis shows that both the conversion of monomer and molecular mass of the resultant polymer increase linearly with reaction time,and the molecular mass fits well with the theoretical value,while the molecular mass distribution keeps unchanged,indicating a living polymerization fashion.The end groups of the oligo-meric product were characterized by NMR spectroscopic analysis.One is methoxy derived from initiator Al-OCH₃ while the other is hydroxyl from terminator methanol,suggesting a coordination insertion mechanism.
- Schiff-base,
- aluminum complex,
- ε-caprolactone,
- polymerization,
- catalysis
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