Novel photochromic molecules based on 4,5-dithienyl thiazole with fast thermal bleaching rate
Novel photochromic molecules based on 4,5-dithienyl thiazole with fast thermal bleaching rate
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DOI：
10.1021/cm0630340
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发表时间：
2007-07-10
影响因子：
8.6
通讯作者：
Kawai, Tsuyoshi
中科院分区：
文献类型：
--
作者：
Kawai, Shigekazu;Nakashima, Takuya;Kawai, Tsuyoshi
合成了新型光致变色三角芳烃，并研究了它们的光致变色性能和热漂白动力学。4，5-二噻吩基噻唑类化合物具有较高的光化学显色活性，光化学量子产率高达0.6。通过在分子结构中引入苯乙炔基团，可以系统地控制热循环还原时间常数10(5)次以上，在303K时，热循环还原反应的半衰期小于2 S。动力学分析表明频率因子A对热还原反应的贡献很大。提出了一种新的分子设计思想，用于系统控制热漂白反应速率，而不以大分子官能团为中心。
Novel photochromic triangle terarylenes are synthesized, and their photochromic properties and thermal bleaching kinetics are investigated. Fairly high photochemical coloration reactivity is observed with photochemical quantum yield as high as 0.6 for 4,5-dithienyl thiazole derivative. Introduction of phenyl-ethynyl groups into the molecular structure allows systematic control of thermal cycloreversion time constant over 10(5) times, and the half-lifetime shorter than 2 s is achieved at 303 K. The kinetic analysis of thermal cycloreversion reaction clearly shows significant contribution of frequency factor A. A novel molecular designing concept for systematic control of thermal bleaching reaction rate is presented without taking bulky functional groups on reaction center.