Photoinduced Intramolecular Electron Transfer in Conjugated Perylene Bisimide-Dithienothiophene Systems: A Comparative Study of a Small Molecule and a Polymer

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• 作者：Jie Huang ; Yishi Wu ; Hongbing Fu ; Xiaowei Zhan ; Jiannian Yao ; Stephen Barlow ; Seth R. Marder
• 刊名：Journal of Physical Chemistry A
• 出版年：2009
• 出版时间：April 30, 2009
• 年：2009
• 卷：113
• 期：17
• 页码：5039-5046
• 全文大小：256K
• 年卷期：v.113,no.17(April 30, 2009)
• ISSN：1520-5215

文摘

The solution photophysical properties of two conjugated dithienothiophene (DTT)-perylene bisimide (PBI) systemsa polymer, poly{[N,N′-bis(2-decyl-tetradecyl)-3,4,9,10-perylene diimide-1,7-diyl]-alt-(dithieno[3,2-b:2′,3′-d]thiophene-2,6-diyl)}, and a small molecule, 1,7-bis(dithieno[3,2-b:2′,3′-d]thiophene-2-yl)-N,N′-bis(2-decyl-tetradecyl)-3,4,9,10-perylene diimidein solution have been investigated. Strong quenching of the fluorescence of the PBI moiety was observed in both DTT-PBI systems, suggesting the possibility of an efficient intramolecular electron-transfer process. The kinetics of photoinduced electron transfer in the DTT-PBI polymer and monomer in solutions were explored by femtosecond time-resolved transient absorption spectra. It was found that both the rates of charge separation and charge recombination in the DTT-PBI polymer were approximately double those in the small molecule. This indicates that electronic coupling plays an important role in the electron-transfer process in a polymer system.