Digital photoswitching of fluorescence based on the photochromism of diarylethene derivatives at a single-molecule level
Digital photoswitching of fluorescence based on the photochromism of diarylethene derivatives at a single-molecule level
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DOI：
10.1021/ja047169n
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发表时间：
2004-11-17
影响因子：
15
通讯作者：
Irie, M
中科院分区：
文献类型：
--
作者：
Fukaminato, T;Sasaki, T;Irie, M
利用荧光技术在单分子水平上研究了二芳基乙烯衍生物的光致变色反应。合成了光致变色二芳基乙烯和荧光双（苯乙炔基）蒽单元通过金刚烷基间隔基连接的荧光光开关分子，并在溶液中以及在单分子水平上的聚合物膜上进行了紫外光和可见光照射后的荧光开关。虽然在溶液中的荧光强度逐渐改变后，用紫外光和可见光照射，在单分子水平上观察到两个离散状态之间的数字开/关切换。“开”和“关”时间取决于紫外线和可见光的功率。当紫外光和可见光的功率增加时，平均开关时间与光的倒数功率成比例地变短。响应时间被发现显示分布。开和关时间的分布被认为反映了微环境的差异以及分子的构象。
Photochromic reactions of diarylethene derivatives were detected at a single-molecule level by using a fluorescence technique. Fluorescent photoswitching molecules in which photochromic diarylethene and fluorescent bis(phenylethynyl)anthracene units are linked through an adamantyl spacer were synthesized, and switching of fluorescence upon irradiation with UV and visible light was followed in solution as well as on polymer films at the single-molecule level. Although in solution the fluorescence intensity gradually changed upon irradiation with UV and visible light, digital on/off switching between two discrete states was observed at the single-molecule level. The "on"- and "off"-times were dependent on the power of UV and visible light. When the power of UV and visible light was increased, the average on- and off-times became short in proportion to the reciprocal power of the light. The response-times were found to show distribution. The distribution of the on- and off-times is considered to reflect the difference in the micro-environment as well as conformation of the molecules.