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学科主题: 高分子化学
题名: Chemical Synthesis of Biodegradable Aliphatic Polyesters and Polycarbonates Catalyzed by Novel Versatile Aluminum Metal Complexes Bearing Salen Ligands
其他题名: 新型Salen铝络合物催化的生物降解性脂肪族聚酯与聚碳酸酯的合成
作者: Yang J(杨晶) ; Yu YH(余亦华) ; Li QB(李巧波) ; Li Y(李洋) ; Cao AM(曹阿民)
通讯作者: 曹阿民
刊名: J. Polym. Sci. Pol. Chem.
发表日期: 2005
卷: 43, 期:2, 页:373-384
收录类别: SCI
部门归属: 上海有机所; 华东师大
英文摘要: Two novel aluminum metal complexes 2 and 3 bearing salen ligands were in-situ prepared from AlMe3, MeOH and (R,R)-N,N’-bis(salicylidene)-1,2-diamine cyclohexane with our original synthetic strategies, and a preliminarily resoluted (R, R)-1, 2-diamine cyclohexane (R, R)-DACH was applied as a synthetic precursor. By means of Fourier transform infrared spectrometer (FTIR), nuclear magnetic resonance spectrometer (NMR), mass spectrometer (MS) and single crystal x-ray diffractometer, the prepared new metal complexes 2 and 3 were revealed to be distinct molecular structures with corresponding yields of 85% and 10%, respectively. Further studies via 27Al NMR techniques and the single crystal x-ray diffraction indicated that the dimeric metal complex 3 appeared as the six-coordinated state, while there was a dynamic equilibrium transition between five- and six-coordinated state for the metal complex 2 in CDCl3 solution. It was worthy to note that the more stable dimeric metal complex 3 exhibited two inequivalent aluminum metal centers coordinated to nitrogen atoms attributed to two different salen ligands, and this is different from the as-reported Salen aluminum complex structures. Furthermore, these two synthesized novel metal complexes 2 and 3 were employed as the candidate catalysts for ring opening polymerization of some important biodegradable aliphatic polyesters and polycarbonates such as poly(?-caprolactone), poly(?-valerolactone), poly(trimethylene carbonate) and poly(2,2-dimethyl trimethylene carbonate). The synthetic results indicated that both metal complexes 2 and 3 could efficiently catalyze ROP at 100 ℃ in anisole solution, and that the metal complex 3 showed much better controlled characteristics of ROP than the metal complex 2, and much narrow molecular weight distributions close to 1.21 for PCL were detected for the metal complex 3 as the ROP catalyst. In addition, the catalytic mechanism study confirmed the ROP catalyzed by these metal complexes was in good agreement with the commonly accepted coordination polymerization manner as reported for Al(OiPr)3 and Sn(Oct)2.
语种: 英语
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WOS记录号: WOS:000225953600011
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内容类型: 期刊论文
URI标识: http://ir.sioc.ac.cn/handle/331003/22908
Appears in Collections:高分子材料研究室_期刊论文

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Recommended Citation:
Yang J,Yu YH,Li QB,et al. Chemical Synthesis of Biodegradable Aliphatic Polyesters and Polycarbonates Catalyzed by Novel Versatile Aluminum Metal Complexes Bearing Salen Ligands[J]. J. Polym. Sci. Pol. Chem.,2005,43(2):373-384.
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