Interaction of oxygen with conjugated polymers: Charge transfer complex formation with poly(3-alkylthiophenes)
Interaction of oxygen with conjugated polymers: Charge transfer complex formation with poly(3-alkylthiophenes)
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DOI：
10.1021/ja964229j
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发表时间：
1997-05-14
影响因子：
15
通讯作者：
Holdcroft, S
中科院分区：
文献类型：
--
作者：
Abdou, MSA;Orfino, FP;Holdcroft, S
分子氧与聚(3-烷基噻吩基)形成可逆电荷转移络合物(CTC)。该络合物结合较弱，但在可见光区有明显的吸收带。中性聚合物的电子性质受CTC的调制。这些性质的调节程度与氧分压成正比，并且是完全可逆的。对聚(3-己基噻吩场效应晶体管)在氧气压力增加下的分析表明，电荷转移络合物的形成增加了载流子浓度，增加了电导率，降低了载流子迁移率。CTC表现为可移动极化子激子的荧光猝灭器，它解释了为什么氧猝灭发光的效率比碰撞猝灭模型预测的要高得多。讨论了电荷转移络合物对聚3-烷基噻吩光化学和单线态氧的光敏化的影响。
Molecular oxygen forms a reversible charge transfer complex (CTC) with poly(3-alkylthiophenes). The complex is weakly bound but possesses a distinct absorption band in the visible region. The electronic properties of the neutral polymer are modulated by the CTC. The extent of modulation of these properties is proportional to oxygen pressure and is fully reversible. Analysis of poly(3-hexylthiophene) field effect transistors under increasing pressures of oxygen shows that the carrier concentration increases, conductivity increases, and the charge carrier mobility is lowered by the formation of the charge transfer complex. The CTC manifests itself as a fluorescence quencher of mobile polaronic excitons, and it explains why oxygen quenches luminescence with much greater efficiency than predicted by a collisional quenching model. Implications of the charge transfer complex on the photochemistry of poly(3-alkylthiophenes) and photosensitization of singlet oxygen are discussed.