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首页> 外文期刊>RSC Advances >The role of structural and electronic factors in shaping the ambipolar properties of donor-acceptor polymers of thiophene and benzothiadiazole
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The role of structural and electronic factors in shaping the ambipolar properties of donor-acceptor polymers of thiophene and benzothiadiazole

机译：结构和电子因素在噻吩和苯并噻唑的供体 - 受体聚合物的塑造中的作用

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摘要

The influence of different thiophene donor units on electrochemical and spectroscopic properties of benzothiadiazole based donor-acceptor pi-conjugated organic materials is studied. Two different structure modification vectors of the donor units are being considered - one addressing the intermolecular interactions through off-conjugation side chain architecture, and the other focusing on intramolecular interactions tuned by in-conjugation substituents. Electrochemical and simultaneous in situ EPR-UV-Vis-NIR spectroelectrochemical studies of the oxidative (p-) and reductive (n-) doping processes, which are responsible for the optoelectronic properties of these materials, revealed their disparate course and dissimilar effects of redox reactions of the conjugated pi-bond. While p-doping prevalent species were found to comprise intensively interacting spin bearing and spinless charge carriers, the n-doping state was found to involve only one type of negatively charged carrier, with spin carrying species being selectively generated at due cathodic potentials. No spin pairing of these negative polarons was observed with their increasing population behaving like a collection of localised charge carriers. Qualitative and quantitative comparisons between the p- and n-doping carrier populations provided independent support for the spin pairing phenomena of positive charge carriers. Steric effects of varying alkyl side chain substitution have demonstrated predominant impact on the electrochemical properties of investigated polymers, and, thereto related, stability of n-doped state, while mesomeric effects of different 3,4-ethylenechalcogenide thiophene functionalities have been found to shape the energy level related spectral properties of these polymers, with particular reference to p-doping induced charged states. These findings provide new insights into the factors requiring attention during structure tailoring of donor-acceptor assemblies for organic optoelectronic applications.
机译：研究了不同噻吩供体单元对基于苯并噻唑基唑 - 受体Pi缀合有机材料的电化学和光谱性能的影响。正在考虑供体单元的两个不同的结构改性载体 - 一种通过偏离缀合侧链架构的分子间相互作用，另一个聚焦在缀合取代基调节的分子内相互作用上。氧化（P-）和还原（N-）掺杂方法的电化学和同时的原位EPR-UV-Vis-NIR光谱电化学研究，其负责这些材料的光电性质，揭示了氧化还原的不同课程和不同的影响共轭的pi-键的反应。虽然发现p掺杂的普遍存在的物种包括强烈地相互作用的旋转轴承和无纺料载体，但发现n掺杂状态涉及一种类型的带负电荷的载体，其中旋转携带物种被选择性地产生在由于太阳极电位。由于种群的增加，因此观察到这些负极化子的旋转配对，其表现得像一系列局部电量载体。 P-和N掺杂载体群之间的定性和定量比较提供了对正电荷载体的旋转配对现象的独立支持。不同烷基侧链取代的空间效应已经对所研究的聚合物的电化学性质表明，与N掺杂状态相关的稳定性，而已经发现不同3,4-乙基丙基甲酚官能团的型效果塑造这些聚合物的能量水平相关光谱性质，特别是对P掺杂诱导的带电状态。这些调查结果为需要在有机光电应用的施主 - 受体组件的结构剪裁期间提供了新的洞察。

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  • 来源
    《RSC Advances》 |2015年第94期|共13页
  • 作者

    Ledwon Przemyslaw; Thomson Neil; Angioni Enrico; Findlay Neil J.; Skabara Peter J.; Domagala Wojciech;

  • 作者单位

    Silesian Tech Univ Dept Phys Chem &

    Technol Polymers Fac Chem PL-44100 Gliwice Poland;

    Univ Strathclyde Dept Pure &

    Appl Chem Glasgow G1 1XL Lanark Scotland;

    Univ Strathclyde Dept Pure &

    Appl Chem Glasgow G1 1XL Lanark Scotland;

    Univ Strathclyde Dept Pure &

    Appl Chem Glasgow G1 1XL Lanark Scotland;

    Univ Strathclyde Dept Pure &

    Appl Chem Glasgow G1 1XL Lanark Scotland;

    Silesian Tech Univ Dept Phys Chem &

    Technol Polymers Fac Chem PL-44100 Gliwice Poland;

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