期刊
DYES AND PIGMENTS
卷 197, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2021.109895
关键词
Host-guest interactions; Molecular assemblies; Light-harvesting systems; Sequential energy transfer; Photocatalysis
A highly efficient artificial light-harvesting system has been constructed based on host-guest interactions between PPTA and CB [7], with two-step sequential energy transfer process transferring energy to EY and SR101. The system demonstrates excellent FRET efficiencies, antenna efficiencies, and high activity for photocatalytic dehalogenation in aqueous solution.
In the present work, a highly efficient artificial light-harvesting system with a two-step sequential energy transfer process based on host-guest interactions between cyano-substituted p-phenylenevinylene derivative (PPTA) and cucurbit [7]uril (CB [7]) has been constructed in an aqueous media, in which the molecular assemblies was employed as energy donors, two dyes including eosin Y (EY) and sulforhodamine (SR101) were used as energy acceptors. The obtained PPTA-CB [7] supramolecular assemblies have aggregation-induced emission (AIE) effect and can be used as an ideal donor to transfer energy to EY. Then, inspired by the multi-step energy transfer in nature, the PPTA-CB [7]+EY system was chosen as the energy donor while SR101 was selected as the energy acceptor to construct an efficient light-harvesting system with a two-step sequential energy transfer, which demonstrated high FRET efficiencies of 38% and 33% in the two-step process, respectively. The light-harvesting systems also exhibit high antenna efficiencies of 23.7 and 20.1 with a 100:1 donor/acceptor ratio, respectively. More importantly, the PPTA-CB [7]+EY + SR101 system exhibited high activity for the photocatalytic dehalogenation of 2-bromo-1-phenylethanone with a yield of up to 86% in an aqueous solution.
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