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Alternating copolymerization of carbon dioxide and cyclohexene oxide catalyzed by salen CoIII(acetate) complexes

机译:Salen CoIII(乙酸盐)配合物催化的二氧化碳和环己烯氧化物的交替共聚

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摘要

A series of CoIII carboxylate based upon N,N,O,O-tetradentate Schiff base ligand framework have been prepared. X-ray diffraction analysis confirms that these Schiff base CoIII carboxylate are all monomeric species with a six-coordinated central Co in their solid structures. The activities and polycarbonate selectivity of these complexes toward the copolymerization of epoxide (cyclohexene oxide and propylene oxide) and carbon dioxide have been investigated in the presence of bis(triphenylphosphine)iminium chloride. Copolymerization experiments indicate that [bis(α-methyl-3,5-di-tertbutyl-salicylaldehyde) ethylenediiminato] CoIIIOOCH3 exhibits the highest activity and polycarbonate selectivity among these CoIII carboxylate. The resultant copolymer contained almost 100 % carbonate linkages with the molecular weight up to 71.8 kg mol−1 as well as narrow polymer dispersity index (polymer dispersity index = 1.5). The substituents and the mode of the bridging part between the two nitrogen atoms both exert significant influences upon the progress of the copolymerizations, influencing both the polycarbonate selectivity and the rate of copolymerization.
机译:制备了一系列基于N,N,O,O-四齿席夫碱配体骨架的羧酸Co III 。 X射线衍射分析证实了这些席夫碱Co III 羧酸盐都是在固态结构中具有六配位中心Co的单体物种。在双(三苯基膦)亚胺氯化物存在下,研究了这些配合物对环氧化物(环己烯和环氧丙烷)和二氧化碳共聚的活性和聚碳酸酯的选择性。共聚实验表明,[双(α-甲基-3,5-二叔丁基-水杨醛醛)乙二亚氨基] Co III OOCH3在这些Co III 羧酸盐。所得共聚物包含几乎100%的碳酸酯键,分子量高达71.8 kg mol -1 ,并且聚合物分散指数窄(聚合物分散指数= 1.5)。两个氮原子之间的取代基和桥接部分的方式均对共聚的进行产生重大影响,从而影响聚碳酸酯的选择性和共聚速率。

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