Polyoctylthiophene electrochemical and optical properties are dependent on the polymer oxidation state, generally requiring presence of doping ions. In this work polyoctylthiophene composites with pyrene or aminopyrene have been prepared and studied using optical and electrochemical methods. It is shown that in the composite formed pyrene molecules act as molecular dopant for the conducting polymer, resulting in a system of partially oxidized polythiophene backbone, yet of high lipophilicity. On the other hand, composite of aminopyrene with polyoctylthiophene is characterized with pH dependent electrochemical and optical properties. The difference arises mostly from the protonation/ deprotonation reaction occurring for aminopyrene embedded in polyoctylothiophene. Nanoparticles of polythiophene‐aminopyrene show turn‐on emission dependence on increase of hydrogen ions concentration in solution in a wide pH range from 12 to 5. For low pH high emission activity is observed for nanoparticles, whereas for films high lipophilicity and low electrochemical activity pointing to presence of semiconducting polymer in the system for protonated aminopyrene. For high pH, when deprotonation of aminopyrene is observed, the system is characterized with low optical, yet high electrochemical activity and low lipophilicity. The electrochemical activity of polyoctylthiophene‐aminopyrene composite can be reversibly switched simply by solution pH change.

中文翻译：

---

聚辛基噻吩-P复合材料的pH可调电化学和光学性质

聚辛基噻吩的电化学和光学性质取决于聚合物的氧化态，通常需要存在掺杂离子。在这项工作中，使用光学和电化学方法制备并研究了具有pyr或氨基py的聚辛基噻吩复合材料。结果表明，在复合物中形成的pyr分子充当导电聚合物的分子掺杂剂，导致部分氧化的聚噻吩主链系统，但具有高亲脂性。另一方面，氨基py与聚辛基噻吩的复合物具有pH依赖性的电化学和光学性质。差异主要是由嵌入聚辛基噻吩的氨基py发生质子/去质子反应引起的。在12至5的宽pH范围内，聚噻吩氨基py的纳米颗粒显示出随溶液中氢离子浓度增加而开启的发射依赖性。对于低pH值，纳米颗粒观察到高发射活性，而对于薄膜，亲脂性高且电化学活性低导致质子化氨基py的体系中存在半导体聚合物。对于高pH值，当观察到氨基py的去质子化时，该系统的特点是光学性能低，但电化学活性高，亲脂性低。聚辛基噻吩-氨基py复合物的电化学活性可以通过改变溶液的pH值而可逆地切换。而对于膜，则具有高亲脂性和低电化学活性，这表明质子化氨基py体系中存在半导体聚合物。对于高pH值，当观察到氨基py的去质子化时，该系统的特点是光学性能低，电化学活性高，亲脂性低。聚辛基噻吩-氨基py复合物的电化学活性可以通过改变溶液的pH值而可逆地切换。而对于膜，则具有高亲脂性和低电化学活性，这表明质子化氨基py体系中存在半导体聚合物。对于高pH值，当观察到氨基py的去质子化时，该系统的特点是光学性能低，电化学活性高，亲脂性低。聚辛基噻吩-氨基py复合物的电化学活性可以通过改变溶液的pH值而可逆地切换。