Chemical synthesis of biodegradable aliphatic polyesters and polycarbonates catalyzed by novel versatile aluminum metal complexes bearing salen ligands
文献类型：期刊论文
| 作者 | Yang, J; Yu, YH; Li, QB; Li, Y; Cao, AI |
| 刊名 | JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
 |
| 出版日期 | 2005-01-15 |
| 卷号 | 43期号:2页码:373-384 |
| 关键词 | Aliphatic Polycarbonate Aliphatic Polyester Aluminum Metal Complex Ring-opening Polymerization |
| ISSN号 | 0887-624X |
| DOI | 10.1002/pola.20507 |
| 英文摘要 | Two novel aluminum metal complexes (2 and 3) bearing salen ligands were in situ prepared from trimethyl aluminum (AlMe3), methanol, and (R,R)-N,N'-bis(salicylidene)-1,2-diaminocyclohexane with original synthetic strategies, and a preliminarily resoluted (R,R)-1,2-diaminocyclohexane was applied as a synthetic precursor. By means of Fourier transform infrared spectrometry, NMR spectrometry, mass spectrometry, and single-crystal X-ray diffractometry, 2 and 3 were revealed to be distinct molecular structures with corresponding yields of 85 and 10%, respectively. Further studies via Al-27 NMR techniques and single-crystal X-ray diffraction indicated that dimeric metal complex 3 appeared in the six-coordinated state, whereas there was a dynamic equilibrium transition between the five- and six-coordinated states for metal complex 2 in a CDCl3 solution. 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 was different from the reported salen aluminum complex structures. Furthermore, 2 and 3 were employed as candidate catalysts for the ring-opening polymerization (ROP) of some important biodegradable aliphatic polyesters and polycarbonates, including poly(epsilon-caprolactone) (PCL), poly(delta-valerolactone), poly(trimethylene carbonate), and poly(2,2-dimethyl trimethylene carbonate). The synthetic results indicated that both metal complexes efficiently catalyzed ROP at 100 degreesC in an anisole solution, and 3 showed much better controlled characteristics of ROP than 2. Very narrow molecular weight distributions close to 1.21 for PCL were detected with 3 as the ROP catalyst. In addition, a catalytic mechanism study confirmed that ROP catalyzed by these metal complexes was in good agreement with the commonly accepted coordination polymerization reported for aluminum triiso [Al((OPr)-Pr-i)(3)] and stannous octanoate [Sn(Oct)(2)]. (C) 2004 Wiley Periodicals, Inc. |
| 语种 | 英语 |
| WOS记录号 | WOS:000225953600011 |
| 出版者 | JOHN WILEY & SONS INC |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/56685]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Cao, AI |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Inst Organ Chem, Polymer Mat Lab, Shanghai 200032, Peoples R China 2.E China Normal Univ, Analyt Ctr, Shanghai 200062, Peoples R China |
| 推荐引用方式 GB/T 7714 | 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]. JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY,2005,43(2):373-384. |
| APA | Yang, J,Yu, YH,Li, QB,Li, Y,&Cao, AI.(2005).Chemical synthesis of biodegradable aliphatic polyesters and polycarbonates catalyzed by novel versatile aluminum metal complexes bearing salen ligands.JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY,43(2),373-384. |
| MLA | Yang, J,et al."Chemical synthesis of biodegradable aliphatic polyesters and polycarbonates catalyzed by novel versatile aluminum metal complexes bearing salen ligands".JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY 43.2(2005):373-384. |
入库方式： OAI收割
来源：化学研究所
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