Alternating Copolymerization of Carbon Dioxide and Propylene Oxide Under Bifunctional Cobalt Salen Complexes: Role of Lewis Base Substituent Covalent Bonded on Salen Ligand
Alternating Copolymerization of Carbon Dioxide and Propylene Oxide Under Bifunctional Cobalt Salen Complexes: Role of Lewis Base Substituent Covalent Bonded on Salen Ligand
复制标题
双功能钴 Salen 配合物下二氧化碳和环氧丙烷的交替共聚：Salen 配体上共价键合的路易斯碱取代基的作用
DOI：
10.1002/pola.23792
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发表时间：
2010-01-15
影响因子：
--
通讯作者：
Wang, Xianhong
中科院分区：
文献类型：
--
作者：
Liu, Binyuan;Gao, Yanhao;Wang, Xianhong
在温和的条件下，以中等的转换频率（TOF）实现了环氧丙烷（PO）和二氧化碳（CO2）的交替共聚合，采用了单一的含有刘易斯酸金属中心和共价键合的刘易斯碱的双功能钴salen配合物。改变salen配体上的共价键合的刘易斯碱取代基可以调整催化活性，TOF从19.3到34.9 h（-1），聚合物/环状碳酸酯选择性从95.3%到72.8%，聚合物中的头-尾结构从72.2%到86.0%。红外光谱分析表明，一个分子上的刘易斯碱部分可以与相邻分子的钴中心配位，起到与Salen金属配合物/刘易斯碱二元催化体系类似的作用。(C)2009 Wiley Periodicals，Inc.聚合物科学杂志A部分：聚合物化学48：359- 365，2010
Alternating copolymerization of propylene oxide (PO) and carbon dioxide (CO2) was realized under mild conditions with a moderate turnover frequency (TOF), employing sole bifunctional cobalt salen complexes containing Lewis acid metal center and covalent bonded Lewis base on the ligand. Variation of the covalent bonded Lewis base substituents on the salen ligands could tailor the catalytic activity with TOF changing from 19.3 to 34.9 h(-1), polymeric/cyclic carbonate selectivity from 95.3 to 72.8%, and the head-to-tail structure in the polymer from 72.2 to 86.0%. The IR analysis confirmed that the Lewis base moiety on one molecule could coordinate with cobalt center of adjacent molecule, playing similar role to the Salen metal complex/Lewis base binary catalytic system. (C) 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48:359-365,2010