NDLI: Ionic Polymer Microspheres Bearing a $Co^{III}–Salen$ Moiety as a Bifunctional Heterogeneous Catalyst for the Efficient Cycloaddition of $CO_{2}$ and Epoxides

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Ionic Polymer Microspheres Bearing a $Co^{III}–Salen$ Moiety as a Bifunctional Heterogeneous Catalyst for the Efficient Cycloaddition of $CO_{2}$ and Epoxides

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Lu, Dan Zhang, Weijie Jiang, Pingping Leng, Yan Zhang, Chenjun Wang, Jun
Description	Author Affiliation: Leng Y ( The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, P. R. China. lengyan1114@126.com.); Lu D ( The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, P. R. China.); Zhang C ( The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, P. R. China.); Jiang P ( The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, P. R. China.); Zhang W ( The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, P. R. China.); Wang J ( State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing, 210009, P. R. China.)
Abstract	We report a unique strategy to obtain the bifunctional heterogeneous catalyst TBB-Bpy@Salen-Co (TBB=1,2,4,5-tetrakis(bromomethyl)benzene, Bpy=4,4’-bipyridine, Salen-Co=N,N’-bis({4-dimethylamino}salicylidene)ethylenediamino cobalt(III) acetate) by combining a cross-linked ionic polymer with a $Co^{III}–salen$ Schiff base. The catalyst showed extra high activity for $CO_{2}$ fixation under mild, solvent-free reaction conditions with no requirement for a co-catalyst. The synthesized catalyst possessed distinctive spherical structural features, abundant halogen $Br^{−}$ anions with good leaving group ability, and accessible Lewis acidic Co metal centers. These unique features, together with the synergistic role of the Co and $Br^{−}$ functional sites, allowed TBB-Bpy@Salen-Co to exhibit enhanced catalytic conversion of $CO_{2}$ into cyclic carbonates relative to the corresponding monofunctional analogues. This catalyst can be easily recovered and recycled five times without significant leaching of Co or loss of activity. Moreover, based on our experimental results and previous work, a synergistic cycloaddition reaction mechanism was proposed.
ISSN	09476539
e-ISSN	15213765
Journal	Chemistry - A European Journal
Issue Number	24
Volume Number	22
Language	English
Publisher	Wiley-VCH;ChemPubSoc Europe
Publisher Date	2016-06-06
Publisher Place	Germany
Access Restriction	Open
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Catalysis

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