Photoreversible Birefringence Change of Diarylethene Single Crystals as Revealed by Change in Molecular Polarizability Anisotropy
Photoreversible Birefringence Change of Diarylethene Single Crystals as Revealed by Change in Molecular Polarizability Anisotropy
复制标题
分子偏振各向异性变化揭示二芳基乙烯单晶的光可逆双折射变化
DOI：
10.1021/acs.jpca.0c02774
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Kobatake Seiya
中科院分区：
文献类型：
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作者：
Morimoto Kohei;Tsujioka Hajime;Kitagawa Daichi;Kobatake Seiya
刺激响应有机晶体代表了材料化学的新领域。最近，我们报道了由光致变色二芳基乙烯衍生物1,2-双(2-乙基-5-苯基-3-噻吩基)全氟环戊烯(1a)组成的单晶中伴随光致变色反应的光可逆干涉颜色变化为多色。干涉颜色变化的起源是由于二芳基乙烯的光异构化中的光致双折射变化。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可逆干涉颜色变化。晶体2a的双折射值随着光环化转化而增加，而晶体1ade的双折射率则降低。基于光致变色反应引起的分子极化率各向异性的变化，讨论了晶体1a和2a的光致双折射变化与其分子结构之间的关系。这些结果不仅为光致变色晶体的应用提供了新的机会，而且为设计表现出所需双折射变化的晶体材料提供了有用的策略。
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 crystal2aincreased with the photocyclization conversion, while that for crystal1adecreased. The relationship between the photoinduced birefringence changes for crystals1aand2aand 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.