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

Content Provider	PubMed Central
Author	Niu, Yongsheng Li, Hongchun
Abstract	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.
Related Links	http://dx.doi.org/10.1007/s00396-013-2957-2
Ending Page	2189
Page Count	9
Starting Page	2181
File Format	PDF
ISSN	14351536
e-ISSN	14351536
Journal	Colloid and Polymer Science
Issue Number	9
Volume Number	291
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-01-01
Access Restriction	Open
Rights Holder	Springer Berlin Heidelberg
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Materials Chemistry Physical and Theoretical Chemistry Polymers and Plastics

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