Issue 44, 2018

Designing conjugated microporous polymers for visible light-promoted photocatalytic carbon–carbon double bond cleavage in aqueous medium

Abstract

The production of valuable carbonyl compounds directly from alkenes via carbon–carbon double (C[double bond, length as m-dash]C) bond cleavage is a highly important reaction. As a promising alternative to traditional metal-catalyzed thermal reaction conditions, photocatalysis offers an environmentally friendly and sustainable synthetic strategy. However, most photocatalysts used so far were homogeneous, molecular and transition metal-based catalytic systems. Here, we report a structural design strategy of conjugated microporous polymers (CMPs) as a class of metal-free, heterogeneous, stable and reusable photocatalysts for visible light-promoted C[double bond, length as m-dash]C bond cleavage reaction. Via different electron donor and acceptor combinations in the CMP backbone structure, we systematically investigated the structural influence of the CMPs on their optical and electrochemical properties, thereby revealing the structure and performance relationship in the photocatalytic C[double bond, length as m-dash]C bond cleavage reaction. As a result, the CMP with a specific electron donor–acceptor combination containing benzothiazole as a strong electron withdrawing unit and phenyl as a weak electron donating unit was the most efficient photocatalyst. The C[double bond, length as m-dash]C bond in various alkenes, mostly styrene derivatives, could be successfully cleaved, forming aldehydes as a product with high conversion and moderate to high selectivity. The green aspect of the work is demonstrated by the utilization of visible-light, molecular oxygen as a cheap oxidant and water-based reaction medium.

Graphical abstract: Designing conjugated microporous polymers for visible light-promoted photocatalytic carbon–carbon double bond cleavage in aqueous medium

Supplementary files

Article information

Article type
Paper
Submitted
16 Jun 2018
Accepted
08 Aug 2018
First published
08 Aug 2018
This article is Open Access
Creative Commons BY license

J. Mater. Chem. A, 2018,6, 22145-22151

Designing conjugated microporous polymers for visible light-promoted photocatalytic carbon–carbon double bond cleavage in aqueous medium

C. Ayed, L. Caire da Silva, D. Wang and K. A. I. Zhang, J. Mater. Chem. A, 2018, 6, 22145 DOI: 10.1039/C8TA05772A

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