Conjugated oligomers and polymers with functionalized side chains: tuning the pi - pi interactions and the optoelectronic properties

在这个项目中，基于含有共轭构建块的噻吩的低聚物和聚合物将被各种侧基功能化。利用光学和双光子光电子能谱研究这些特定侧群对π、π堆积和能级的影响。具体来说，我们的目标是评估不同类型的侧基在以下方面的作用和影响：(i)开发调整共轭低聚物和聚合物的组装结构和光电功能的新方法；（ii）形成可用于包括传感器在内的不同设备的新光电材料；(3)通过侧链上官能团的化学反应或金属离子配位生成二维共轭体系。这些目标将与中国科学院化学研究所（ICCAS）密切合作，在北京合成功能化有机系统。这些系统的电子特性将通过（时间分辨）光学和双光子光电子能谱进行分析。最后一种方法可以确定已占用和未占用层的能量位置。单重态和三重态的相对位置以及它们之间的电子能量转移是特别有趣的。

In this project oligomers and polymers based on thiophene containing conjugated building blocks will be functionalized by various side groups. The influence of such specific side groups on the pi, pi stacking and the energy levels will be investigated by optical and two-photon photoelectron spectroscopy. Specifically, we aim to evaluate the roles and influences of different types of side groups for (i) the development of new approaches to tune the assembly structures and optoelectronic functions of conjugated oligomers and polymers, (ii) for the formation of new optoelectronic materials which can be used for different devices including sensors, and (iii) for the generation of two dimensional conjugated systems via chemical reaction or metal ion coordination of the functional groups in the side chains. These goals will be pursued in close collaboration with the Institute for Chemistry, Chinese Academy of Sciences (ICCAS), Beijing, where the functionalized organic systems will be synthesized. The electronic properties of these systems will be analyzed by (time-resolved) optical and two-photon photoelectron spectroscopy. This last method allows to determine the energetic position of occupied and unoccupied levels. The relative position of singlet and triplet states and the electronic energy transfer between them is of specific interest.