Reducing the Exciton Binding Energy of Donor–Acceptor‐Based Conjugated Polymers to Promote Charge‐Induced Reactions

Exciton binding energy has been regarded as a crucial parameter for mediating charge separation in polymeric photocatalysts. Minimizing the exciton binding energy of the polymers can increase the yield of charge‐carrier generation and thus improve the photocatalytic activities, but the realization o...

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Published inAngewandte Chemie International Edition Vol. 58; no. 30; pp. 10236 - 10240
Main Authors Lan, Zhi‐An, Zhang, Guigang, Chen, Xiong, Zhang, Yongfan, Zhang, Kai A. I., Wang, Xinchen
Format Journal Article
LanguageEnglish
Published Germany Wiley Subscription Services, Inc 22.07.2019
EditionInternational ed. in English
Subjects
Binding energy
Charge transfer
charge-transfer pathway
Chemical reduction
conjugated polymer
Current carriers
Electron transfer
Energy charge
Energy conservation
Energy dissipation
Energy loss
exciton binding energy
Excitons
Heat treating
hydrogen evolution
Irradiation
Light irradiation
Photocatalysis
Photochemicals
Polymers
Radiation
Thermodynamics
exciton binding energy
hydrogen evolution
charge-transfer pathway
photocatalysis
conjugated polymer
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Summary:Exciton binding energy has been regarded as a crucial parameter for mediating charge separation in polymeric photocatalysts. Minimizing the exciton binding energy of the polymers can increase the yield of charge‐carrier generation and thus improve the photocatalytic activities, but the realization of this approach remains a great challenge. Herein, a series of linear donor–acceptor conjugated polymers has been developed to minimize the exciton binding energy by modulating the charge‐transfer pathway. The results reveal that the reduced energy loss of the charge‐transfer state can facilitate the electron transfer from donor to acceptor, and thus, more electrons are ready for subsequent reduction reactions. The optimized polymer, FSO‐FS, exhibits a remarkable photochemical performance under visible light irradiation. Modulating the charge‐transfer pathway in a series of linear donor–acceptor conjugated polymers controls their ability to minimize the exciton binding energy. A low exciton binding energy promotes the photoreaction for artificial photosynthesis
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ISSN:1433-7851
1521-3773
1521-3773
DOI:10.1002/anie.201904904