Huang Jie, Wu Yishi, Fu Hongbing, Zhan Xiaowei, Yao Jiannian, Barlow Stephen, Marder Seth R
Beijing National Laboratory for Molecular Sciences (BNLMS) and Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
J Phys Chem A. 2009 Apr 30;113(17):5039-46. doi: 10.1021/jp8107655.
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.
研究了两种共轭二噻吩并噻吩（DTT）-苝二酰亚胺（PBI）体系（一种聚合物，聚{[N,N'-双（2-癸基-十四烷基）-3,4,9,10-苝二酰亚胺-1,7-二基]-alt-（二噻吩并[3,2-b:2',3'-d]噻吩-2,6-二基）}和一种小分子，1,7-双（二噻吩并[3,2-b:2',3'-d]噻吩-2-基）-N,N'-双（2-癸基-十四烷基）-3,4,9,10-苝二酰亚胺）在溶液中的光物理性质。在两种DTT-PBI体系中均观察到PBI部分荧光的强烈猝灭，这表明存在高效分子内电子转移过程的可能性。通过飞秒时间分辨瞬态吸收光谱研究了DTT-PBI聚合物和单体在溶液中的光致电子转移动力学。发现DTT-PBI聚合物中的电荷分离和电荷复合速率大约是小分子中的两倍。这表明电子耦合在聚合物体系的电子转移过程中起重要作用。
