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Issue 18, 2017

Noncovalent immobilization of pyrene-terminated hyperbranched triazole-based polymeric ionic liquid onto graphene for highly active and recyclable catalysis of CO2/epoxide cycloaddition

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Abstract

The first examples of bifunctional hyperbranched polymers (HBP) with high density ionic liquid (IL) moieties in the main chain and controllable amount of pyrene groups at the chain ends (Py-HBPIL) have been synthesized via a facile three-step procedure, which were then immobilized onto reduced graphene oxide (rGO) via π–π stacking interactions. Py-HBPIL(Br) bearing pyrene groups at 10% of the chain ends allowed the highest immobilization loading of 73% in weight. The resultant Py-HBPIL(Br)@rGO hybrid material displayed much better catalytic activity than ever reported for immobilized IL catalysts for coupling reaction between CO2 and propylene oxide (PO), and it could be reused up to 6 times by simple filtration process without significant decline in activity. Furthermore, the combination of bifunctional HBP and π–π stacking immobilization may provide a general and versatile platform to design highly active, selective and recyclable catalysts for various chemical transformations.

Graphical abstract: Noncovalent immobilization of pyrene-terminated hyperbranched triazole-based polymeric ionic liquid onto graphene for highly active and recyclable catalysis of CO2/epoxide cycloaddition

Supplementary files

Article information


Submitted
23 Jun 2017
Accepted
14 Aug 2017
First published
14 Aug 2017

Catal. Sci. Technol., 2017,7, 4173-4181
Article type
Paper

Noncovalent immobilization of pyrene-terminated hyperbranched triazole-based polymeric ionic liquid onto graphene for highly active and recyclable catalysis of CO2/epoxide cycloaddition

Y. Wang, X. Guan, F. Chen, S. Zhu, Y. Ye, H. Peng, X. Zhou, X. Xie and Y. Mai, Catal. Sci. Technol., 2017, 7, 4173 DOI: 10.1039/C7CY01259D

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