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A New Dinuclear Cobalt Complex for Copolymerization of CO(2) and Propylene Oxide: High Activity and Selectivity

Based on the ligand H(4)Salen-8(t)Bu (salen-4), a new dinuclear cobalt complex (salen-4)[Co(III)TFA](2) (salen-4 = 3,5-di-tert-butylsalicylaldehyde-3,3′-diaminobiphenylamine; TFA = trifluoroacetic acid) has been firstly synthesized and characterized. It shows high catalytic activity for the copolyme...

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Autores principales: Wang, Wen-Zhen, Zhang, Kai-Yue, Jia, Xin-Gang, Wang, Li, Li, Lei-Lei, Fan, Wei, Xia, Li
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7571228/
https://www.ncbi.nlm.nih.gov/pubmed/32911616
http://dx.doi.org/10.3390/molecules25184095
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author Wang, Wen-Zhen
Zhang, Kai-Yue
Jia, Xin-Gang
Wang, Li
Li, Lei-Lei
Fan, Wei
Xia, Li
author_facet Wang, Wen-Zhen
Zhang, Kai-Yue
Jia, Xin-Gang
Wang, Li
Li, Lei-Lei
Fan, Wei
Xia, Li
author_sort Wang, Wen-Zhen
collection PubMed
description Based on the ligand H(4)Salen-8(t)Bu (salen-4), a new dinuclear cobalt complex (salen-4)[Co(III)TFA](2) (salen-4 = 3,5-di-tert-butylsalicylaldehyde-3,3′-diaminobiphenylamine; TFA = trifluoroacetic acid) has been firstly synthesized and characterized. It shows high catalytic activity for the copolymerization of propylene oxide (PO) and carbon dioxide (CO(2)), yielding regioregular poly(propylene carbonate) (PPC) with little generation of propylene carbonate (PC) by-product. It has been found that (salen-4)[Co(III)TFA](2) shows higher activity at milder conditions, generating a polymer with maximum Mn of 293 kg/mol and a narrow molecular weight distribution PDI of 1.35. The influences of reaction time, CO(2) pressure, reaction temperature, nature of the cocatalyst, catalyst dosage and substrate concentration on the molecular weight, yield and selectivity of the polymer were explored in detail. The results showed that the (salen-4)[Co(III)TFA](2)/[PPN]TFA catalyst system demonstrated a remarkable TOF as high as 735 h(–1). In addition, a hypothetical catalytic reaction mechanism was proposed based on density functional theory (DFT) calculations and the catalytic reaction results of the (salen-4)[Co(III)TFA](2).
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spelling pubmed-75712282020-10-28 A New Dinuclear Cobalt Complex for Copolymerization of CO(2) and Propylene Oxide: High Activity and Selectivity Wang, Wen-Zhen Zhang, Kai-Yue Jia, Xin-Gang Wang, Li Li, Lei-Lei Fan, Wei Xia, Li Molecules Article Based on the ligand H(4)Salen-8(t)Bu (salen-4), a new dinuclear cobalt complex (salen-4)[Co(III)TFA](2) (salen-4 = 3,5-di-tert-butylsalicylaldehyde-3,3′-diaminobiphenylamine; TFA = trifluoroacetic acid) has been firstly synthesized and characterized. It shows high catalytic activity for the copolymerization of propylene oxide (PO) and carbon dioxide (CO(2)), yielding regioregular poly(propylene carbonate) (PPC) with little generation of propylene carbonate (PC) by-product. It has been found that (salen-4)[Co(III)TFA](2) shows higher activity at milder conditions, generating a polymer with maximum Mn of 293 kg/mol and a narrow molecular weight distribution PDI of 1.35. The influences of reaction time, CO(2) pressure, reaction temperature, nature of the cocatalyst, catalyst dosage and substrate concentration on the molecular weight, yield and selectivity of the polymer were explored in detail. The results showed that the (salen-4)[Co(III)TFA](2)/[PPN]TFA catalyst system demonstrated a remarkable TOF as high as 735 h(–1). In addition, a hypothetical catalytic reaction mechanism was proposed based on density functional theory (DFT) calculations and the catalytic reaction results of the (salen-4)[Co(III)TFA](2). MDPI 2020-09-08 /pmc/articles/PMC7571228/ /pubmed/32911616 http://dx.doi.org/10.3390/molecules25184095 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Wang, Wen-Zhen
Zhang, Kai-Yue
Jia, Xin-Gang
Wang, Li
Li, Lei-Lei
Fan, Wei
Xia, Li
A New Dinuclear Cobalt Complex for Copolymerization of CO(2) and Propylene Oxide: High Activity and Selectivity
title A New Dinuclear Cobalt Complex for Copolymerization of CO(2) and Propylene Oxide: High Activity and Selectivity
title_full A New Dinuclear Cobalt Complex for Copolymerization of CO(2) and Propylene Oxide: High Activity and Selectivity
title_fullStr A New Dinuclear Cobalt Complex for Copolymerization of CO(2) and Propylene Oxide: High Activity and Selectivity
title_full_unstemmed A New Dinuclear Cobalt Complex for Copolymerization of CO(2) and Propylene Oxide: High Activity and Selectivity
title_short A New Dinuclear Cobalt Complex for Copolymerization of CO(2) and Propylene Oxide: High Activity and Selectivity
title_sort new dinuclear cobalt complex for copolymerization of co(2) and propylene oxide: high activity and selectivity
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7571228/
https://www.ncbi.nlm.nih.gov/pubmed/32911616
http://dx.doi.org/10.3390/molecules25184095
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