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首页> 外文期刊>Advanced functional materials >Organic Conjugated Trimers with Donor-Acceptor-Donor Structures for Photocatalytic Hydrogen Generation Application
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Organic Conjugated Trimers with Donor-Acceptor-Donor Structures for Photocatalytic Hydrogen Generation Application

机译：Organic Conjugated Trimers with Donor-Acceptor-Donor Structures for Photocatalytic Hydrogen Generation Application

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摘要

Organic donor–acceptor–donor (D–A–D) polymers or small molecules arewidely investigated in organic solar cells due to their broad light absorption,narrow band gap, excellent charge mobility, and exciton seperation atthe interface. However, studies of conjugated small molecules with D–A–Dmolecule structures as photocatalytically active materials are still rare. In thisstudy, an unprecedented demonstration that photocatalytic activity can in factbe affected by tuning the D and A is given. Especially, the EBE trimer, comprising3,4-ethylenedioxythiophene (E) and benzothiadiazole (B) units, exhibitsthe best photophysical, chemical, and photocatalytic properties compared toother D–A–D combinations of D and A. Detailed kinetic studies show thatall trimers in organic solution present relatively long-lived and highly emissivephotogenerated singlet excitons (τ = 4–13 ns; φ_(em) = 0.5–0.9) as judged byphotoluminescence and transient absorption measurements, while in specificcases formation of long-lived triplet states can be identified. Organic microparticlesof the trimers are efficiently formed in aqueous solution by nanoprecipitation,and rapid photoinduced electron release/injection to the solventis evidenced spectroscopically. The results indicate that organic small moleculestructures with D–A–D structures pave a new pathway for photocatalyticsolar-to-chemical energy conversion of novel small organic molecules.

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