Minion Louis, Wade Jessica, Moreno-Naranjo Juan Manuel, Ryan Seán, Siligardi Giuliano, Fuchter Matthew J
Department of Materials, Imperial College London, London, UK.
Centre for Processable Electronics, Imperial College London, South Kensington Campus, London, UK.
Chirality. 2023 Nov;35(11):817-825. doi: 10.1002/chir.23601. Epub 2023 Jun 22.
We synthesized a fluorene-bithiophene co-polymer with chiral side chains (cPFT2) and investigated its chiroptical properties via synchotronradiation circular dichroism. We observed that thin films of the polymer display an intense circular dichroism (CD) upon annealing, which is of opposite handedness to the CD reported for similar polyfluorenes bearing the same enantiomeric chiral side chain. We then contrast the properties of this polymer with chiral side chain fluorene homopolymer (cPF) and observe large differences in their thin film morphology. Using photoluminescence spectroscopy, we uncover evidence of polymer chain bending in cPFT2, which is further supported by theoretical calculations, and propose an explanation for the observed inverted optical activity.
我们合成了一种带有手性侧链的芴-联噻吩共聚物（cPFT2），并通过同步辐射圆二色性研究了其手性光学性质。我们观察到，该聚合物薄膜在退火后显示出强烈的圆二色性（CD），其旋光方向与报道的带有相同对映体手性侧链的类似聚芴的CD相反。然后，我们将这种带有手性侧链的聚合物与手性侧链芴均聚物（cPF）的性质进行对比，观察到它们在薄膜形态上有很大差异。利用光致发光光谱，我们发现了cPFT2中聚合物链弯曲的证据，这一证据得到了理论计算的进一步支持，并对观察到的反向光学活性提出了解释。
