Novel Photochromic Molecules Based on 4,5-Dithienyl Thiazole with Fast Thermal Bleaching Rate

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• 作者：Shigekazu Kawai ; Takuya Nakashima ; Kazuhiko Atsumi ; Toshiyuki Sakai ; Miki Harigai ; Yasushi Imamoto ; Hironari Kamikubo ; Mikio Kataoka ; Tsuyoshi Kawai
• 刊名：Chemistry of Materials
• 出版年：2007
• 出版时间：July 10, 2007
• 年：2007
• 卷：19
• 期：14
• 页码：3479 - 3483
• 全文大小：207K
• 年卷期：v.19,no.14(July 10, 2007)
• ISSN：1520-5002

文摘

Novel photochromic triangle terarylenes are synthesized, and their photochromic properties and thermalbleaching kinetics are investigated. Fairly high photochemical coloration reactivity is observed withphotochemical 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 timeconstant over 10⁵ times, and the half-lifetime shorter than 2 s is achieved at 303 K. The kinetic analysisof thermal cycloreversion reaction clearly shows significant contribution of frequency factor A. A novelmolecular designing concept for systematic control of thermal bleaching reaction rate is presented withouttaking bulky functional groups on reaction center.