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Large Photoinduced Circular Dichroism in Chiral Polyfluorene

机译:手性聚芴中的大光致圆二色性

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摘要

At 77 K, thermally annealed films of chiral poly[9,9-bis((3S)-3,7-dimethyloctyl)-2,7-fluorene] show a photoinduced absorption (PIA) band near 1.5 eV due to a transition from the lowest triplet state to a higher triplet state. This photoinduced absorption is found to show circular dichroism (CD). Dividing this CD by the magnitude of the PIA, we find that the selectivity for absorption of left circular polarized light over right circularly polarized light is remarkably high and characterized by a dissymmetry ratio g)+0.2. The unusual magnitude of g is interpreted as arising from extrinsic CD, i.e., from the interaction of the local linear polarization of the triplet-triplet absorption with the linear birefringence of the surrounding polymer matrix.
机译:在77 K时,手性聚[9,9-双((3S)-3,7-二甲基辛基)-2,7-芴]的热退火膜由于光致跃迁而在1.5 eV附近显示出光致吸收(PIA)带。最低的三元态到较高的三元态。发现这种光诱导的吸收显示出圆二色性(CD)。用该CD除以PIA的大小,我们发现吸收左圆偏振光相对于右圆偏振光的选择性非常高,其特征在于不对称比g)+0.2。 g的异常大小被解释为由外在CD引起,即由三重态-三重态吸收的局部线性极化与周围聚合物基质的线性双折射的相互作用引起。

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