l-4-yl)perfluorocyclopentene (2a)] having methoxy substituents at the reaction centers were synthesized and their photochromic reactivity was compared with 1,2-bis(5-methyl-2-phenylthiazol-4-yl)perfluorocyclopentene (3a), which has methyl substituents at the reaction centers. All dithiazolylethene derivatives underwent reversible photocyclization reactions from the open-ring forms 1a, 2a, and 3a to
Practical Synthesis of Photochromic Diarylethenes in Integrated Flow Microreactor Systems
作者:Tatsuro Asai、Atsushi Takata、Aiichiro Nagaki、Jun-ichi Yoshida
DOI:10.1002/cssc.201100376
日期:2012.2.13
An effective method for the synthesis of photochromicdiarylethenes through the generation of heteroaryllithiums and subsequent reaction with octafluorocyclopentene has been developed by using integratedflowmicroreactorsystems. Reactions can be conducted without using cryogenic conditions by virtue of effective temperature and residence time control, although much lower temperatures (<−78 °C) are
通过使用集成的流动微反应器系统,已经开发出一种有效的方法,该方法可通过杂芳基锂的生成以及随后与八氟环戊烯的反应来合成光致变色二硫杂环丁烷。通过有效的温度和停留时间控制,可以在不使用低温条件的情况下进行反应,尽管批量宏观反应需要低得多的温度(<-78°C)。此外,基于选择性引入一个芳基以产生芳基七氟环戊烯,然后引入另一个芳基,已经完成了使用常规间歇式大分子系统时难以实现的不对称二芳烃的合成。实验室规模的系统的生产率约为0.5 mmol min -1。因此,本集成流式微反应器方法是合成各种光致变色二芳基乙烯衍生物的实用方法。
Synthesis of photochromic diarylethenes using a microflow system
作者:Yousuke Ushiogi、Tomoyuki Hase、Yoshiharu Iinuma、Atsushi Takata、Jun-ichi Yoshida
DOI:10.1039/b702277h
日期:——
An effective method for the synthesis of photochromicdiarylethenes based on microflow systems has been developed, and the synthesis of unsymmetrical diarylethenes which is difficult to achieve using conventional macro batch systems, has been accomplished.
Disclosed is light-driven actuator element characterized in that, inter alia, it can be reduced to micrometer size, is rapidly responsive, and reversibly changes to enable repeated use. The light-driven actuator element includes a crystal of diarylethene compound which changes shape upon photoisomerization (e.g., the compound of Structural Formula (I) below, where R
1
represents a hydrogen atom or methyl group and R
2
represents a methyl group). The element can be a rod-shaped or plate-like microcrystal having a size on the order of micrometer. The element bends (or contracts) on irradiation with ultraviolet light and expands to return to the original size on irradiation with visible light.
Herein, we report on wavelength-selective and high-contrast multicolour fluorescence photoswitching between white-, orange-, cyan-, and dark-colours in a mixture of two distinguishable emission-coloured photochromic nanoparticles composed of different pairs of a photoswitching unit and a fluorescence unit.