Photoinduced Repetitive Separation of the Supramolecular Assembly composed of Amphiphilic Diarylethene Mixture
Photoinduced Repetitive Separation of the Supramolecular Assembly composed of Amphiphilic Diarylethene Mixture
复制标题
两亲性二芳基乙烯混合物组成的超分子组装体的光诱导重复分离
DOI：
10.1039/c9sm01301f
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发表时间：
2019
期刊：
影响因子：
3.4
通讯作者：
K. Matsuda*
中科院分区：
文献类型：
--
作者：
S. Sakakibara;H. Yotsuji;K. Higashiguchi*;K. Matsuda*
由两亲性二芳基乙烯的两组分混合物组成的超分子组装体，其具有辛氧基羰基和N-辛基氨基甲酰基，在用UV光照射并随后在黑暗中站立时显示出独特的宏观转变。与纯化合物不同，组装体被重复分离成蓝色球体和红紫色稀疏结构。在可见光照射下，蓝色球体和稀疏结构都变成无色球体，并且分割的无色球体对UV和可见光显示出相同的响应。基于温度变化时吸收光谱的变化的相图表明，该转变起源于LCST转变。在0.5：0.5的混合物中，与纯化合物相比，转变温度在闭环异构体分数的50%左右急剧变化。 TEM成像显示具有高光异构化产率的0.5：0.5混合物形成10 nm大小的网络。 从相图和TEM图像判断，分离被理解为具有高比例的闭环异构体的区域的局部相变。
A supramolecular assembly composed of a two-component mixture of amphiphilic diarylethenes, which have octyloxycarbonyl and N-octylcarbamoyl groups, showed a unique macroscopic transformation upon irradiation with UV light and subsequent standing in the dark. Unlike the pure compounds, the assembly was repetitively separated into a blue sphere and a red-purple sparse structure. Both the blue sphere and the sparse structure turned into colorless spheres upon irradiation with visible light and the divided colorless spheres showed the same response to UV and visible light. Phase diagrams based on the change in absorption spectra upon temperature change suggested that the transformation originates from a LCST transition. In the 0.5 : 0.5 mixture, in contrast to the pure compounds, the transition temperature sharply changed at around 50% of the fraction of the closed-ring isomer. TEM imaging showed that the 0.5 : 0.5 mixture with high photoisomerization yield formed a 10 nm-sized network. Judging from the phase diagram and TEM images, the separation is understood as the local phase transition of the regions with a high fraction of the closed-ring isomer.