Size Effects of Oligothiophene on the Dynamics of Electron Transfer in -Conjugated Oligothiophene-Perylene Bisimide Dyads
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- 作者：Jie Huang ; Hongbing Fu ; Yishi Wu ; Shiyan Chen ; Fugang Shen ; Xiaohui Zhao ; Yunqi Liu ; Jiannian Yao
- 刊名：Journal of Physical Chemistry C
- 出版年：2008
- 出版时间：February 21, 2008
- 年：2008
- 卷：112
- 期：7
- 页码：2689 - 2696
- 全文大小：277K
- 年卷期：v.112,no.7(February 21, 2008)
- ISSN：1932-7455
文摘
The photophysical properties of a series of 
-conjugated oligothiophene-perylene bisimide dyads nT-PBI (n= 1, 2, and 3) in solutions were investigated. A sharp fluorescence quenching of the perylene bisimide moietyin these dyads nT-PBI (n = 1, 2, and 3) was observed upon photoexcitation of the perylene bisimide moiety,indicating a fast and efficient electron-transfer process. The properties of photoinduced electron transfer ofthese dyads nT-PBI (n = 1, 2, and 3) in solutions were investigated by time-resolved fluorescence spectraand femtosecond transient absorption spectra in the visible region. It was found that as the number of thiophenerepeat units, i.e., the size, increases, the rate constants of charge separation and charge recombination increaseabout 3 orders and over 1 order of magnitude, respectively, because of the combined effects of energeticsand electronic coupling. These results demonstrate that a change in size of donor could change and modulatethe dynamics of electron transfer.
-conjugated oligothiophene-perylene bisimide dyads nT-PBI (n= 1, 2, and 3) in solutions were investigated. A sharp fluorescence quenching of the perylene bisimide moietyin these dyads nT-PBI (n = 1, 2, and 3) was observed upon photoexcitation of the perylene bisimide moiety,indicating a fast and efficient electron-transfer process. The properties of photoinduced electron transfer ofthese dyads nT-PBI (n = 1, 2, and 3) in solutions were investigated by time-resolved fluorescence spectraand femtosecond transient absorption spectra in the visible region. It was found that as the number of thiophenerepeat units, i.e., the size, increases, the rate constants of charge separation and charge recombination increaseabout 3 orders and over 1 order of magnitude, respectively, because of the combined effects of energeticsand electronic coupling. These results demonstrate that a change in size of donor could change and modulatethe dynamics of electron transfer.