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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Photoreversible Birefringence Change of Diarylethene Single Crystals as Revealed by Change in Molecular Polarizability Anisotropy
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Photoreversible Birefringence Change of Diarylethene Single Crystals as Revealed by Change in Molecular Polarizability Anisotropy

机译:通过分子极化性各向异性的变化揭示的二芳基乙烯单晶的光量可变双折射变化

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摘要

Stimuli-responsive organic crystals represent a new frontier of material chemistry. Recently, we have reported photoreversible interference color change to multicolor in single crystals composed of a photochromic diarylethene derivative, 1,2-bis(2-ethyl-5-phenyl-3-thienyl)perfluorocyclopentene (1a), accompanied by the photochromic reaction. The origin of the interference color change is due to the photoinduced birefringence change in the photoisomerization of diarylethenes. In this study, we newly found that single crystals composed of 1,2-bis(2,5-dimethyl-3-thienyl)perfluorocyclopentene (2a) also exhibit a photoreversible interference color change. The birefringence value for crystal 2a increased with the photocyclization conversion, while that for crystal 1a decreased. The relationship between the photoinduced birefringence changes for crystals 1a and 2a and their molecular structures was discussed based on the change in the molecular polarizability anisotropy accompanied by the photochromic reaction. These results would provide not only new opportunities for the application of photochromic crystals but also useful strategies for the design of crystalline materials that exhibit the desired birefringence change.
机译:刺激响应性的有机晶体代表材料化学的新前沿。最近,我们已经报道了由光致变色二芳基甲烯衍生物,1,2-双(2-乙基-5-苯基-3-噻吩基)全氟环戊烯(1A)组成的单晶中的多色晶体中的光学干扰颜色变化。伴随着光致变色反应。干扰颜色变化的起源是由于二芳基甲烯的光射击的光诱导的双折射变化。在这项研究中,我们新发现由1,2-双(2,5-二甲基-3-噻吩基)全氟环戊烯(2a)组成的单晶也表现出光耐可逆的干涉颜色变化。晶体2a的双折射值随着光循环转换而增加,而晶体1a的晶体1a降低。基于分子极化性各向异性的变化伴随着光致变色反应的变化,讨论了晶体1A和2A的光抑制双折射变化与其分子结构之间的关系。这些结果不仅提供了应用光致变色晶体的新机会,而且还提供了具有表现出所需的双折射变化的结晶材料的有用策略。

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