1-thiazolyl-2-vinylcyclopentene derivative 3a have been synthesized in an attempt to obtain photochromic compounds which change the color from colorless to yellow, and have low photocycloreversion quantum yields and high absorption coefficients of the colored isomers. All of these compounds underwent reversible photochromic reactions. Compounds 1a and 2a in toluene solutions changed the color upon 313 nm light irradiation
合成了两个1-
噻唑基-2-
噻吩基
环戊烯衍
生物1a和2a,以及1-
噻唑基-2-
乙烯基环戊烯衍
生物3a,以试图获得将颜色从无色变为黄色且光环还原量子产率低的光致变色化合物。和有色异构体的高吸收系数。所有这些化合物都经历了可逆的光致变色反应。
甲苯溶液中的化合物1a和2a在313 nm光照射下从无色变为橙色和粉红色,其中在494 nm(ε = 10,000 M -1 cm -1)和525 nm(ε分别为8500 M -1 cm -1)。另一方面,3a的无色
甲苯溶液在313nm的光照射下变为黄色,在416nm (ε= 17,100M -1 cm -1)处观察到最大吸收。的photocyclization /裂环作用的量子产率3分别为0.19和0.0014。在313 nm的光照射下,光固定态的3的开环异构体到闭环异构体的转化率接近100%。